Re: [CMake] CMake + Gradle for Android
I could probably do you one better, and just give you a stripped-down version of our repository. Basically, I'd remove all our C++ and Java source code but leave the CMake scripts and such intact somehow. It would take me some time to do this, though. Would this be helpful for you? In the meantime, when I get into the office tomorrow I'll answer your questions directly with as much detail as possible. Would you like me to contact you personally from this point on or should we keep the conversation on the CMake list? On Fri, Aug 25, 2017 at 7:20 PM, Jom O'Fisherwrote: > Hi again Robert, > Would you be able to give me an estimate of how many APK projects you have, > roughly which open source projects you reference via CMake > add_subdirectories, and whether you have any variants beyond the default > Debug and Release? If possible I'd like to approximate your project layout > so we can study it in more closely with an eye toward making the experience > better for this kind of layout. > > > > > > On Fri, Aug 25, 2017 at 2:46 PM, Jom O'Fisher wrote: >> >> Targets are specified per-Variation so they need to go under the >> variation-specific section. Probably something like this: >> >> defaultConfig { >> externalNativeBuild { >> cmake { >> targets "library1", "library2" >> } >> } >> } >> >> That should work for you. Let me know. >> >> On Fri, Aug 25, 2017 at 2:42 PM, Robert Dailey >> wrote: >>> >>> By the way when I try to use "targets", I get a failure. Basically >>> Gradle doesn't recognize that keyword. I tried singular form as well >>> ("target"), no luck. >>> >>> I'm running canary build of everything possible. What am I missing? >>> >>> On Wed, Aug 23, 2017 at 4:20 PM, Jom O'Fisher >>> wrote: >>> > By gradle module projects, I just mean the leaf build.gradle files as >>> > opposed to the root build.gradle. By configurations, I mean Build Types >>> > (debug vs release) and Product Flavors (demo vs free vs paid). >>> > Hereafter I >>> > will use the term "variant" rather than "configuration" to be precise. >>> > See >>> > this write-up on build variants: >>> > >>> > >>> > https://developer.android.com/studio/build/build-variants.html#build-types >>> > >>> > This build matrix is constructed at the leaf build.gradle level. Native >>> > build in gradle allows you to set C/C++ flags individually for each >>> > variant >>> > so that you can define compiler flags (for example, -DFREE_VERSION). >>> > >>> > One thing to notice at this stage is that the same CMake target may be >>> > built >>> > with different compiler flags across different projects, build types, >>> > and >>> > product flavors. So in the general case, build outputs won't be the >>> > same. >>> > >>> > You asked which targets build when specifying path. By default, we >>> > build all >>> > targets that produce an .so. You can override this by setting >>> > externalNativeBuild.cmake.targets. For example, >>> > >>> > paid { >>> > ... >>> > externalNativeBuild { >>> > cmake { >>> > ... >>> > targets "native-lib-paid" >>> > } >>> > } >>> > } >>> > >>> > As for your last question, the model we generally see used is that the >>> > main >>> > CMakeLists.txt is next to the leaf build.gradle such that this >>> > CMakeLists.txt doesn't couple with peer APK project CMakeLists.txt >>> > (though >>> > they may share common dependencies and settings). Otherwise, multiple >>> > APK >>> > projects would perform pretty much similar to yours--they would build >>> > targets per-leaf project and not share build outputs. As far as I can >>> > see >>> > your organization is just as valid so long as you only build the >>> > targets you >>> > need. >>> > >>> > Regarding native dependencies between java projects. We generally try >>> > to >>> > avoid making the CMake build depend on the gradle build (you should be >>> > able >>> > to replicate the CMake build from the command-line if you set the right >>> > flags). At the moment I don't see a way we could make things better >>> > without >>> > violating that tenet but that could be lack of imagination on my part. >>> > >>> > We'll definitely be discussing this use case at our next C++ meeting >>> > and >>> > I'll also be checking for myself whether ccache will work in this CMake >>> > scenario. If ccache does work it seems like the natural level at which >>> > to >>> > fold identical builds. >>> > >>> > >>> > >>> > On Wed, Aug 23, 2017 at 1:03 PM, Robert Dailey >>> > >>> > wrote: >>> >> >>> >> I'm not sure what you mean by "gradle module projects", but maybe >>> >> having some examples of what you mean by "configurations, C++ flags, >>> >> etc" might make
Re: [CMake] CMake + Gradle for Android
Hi again Robert, Would you be able to give me an estimate of how many APK projects you have, roughly which open source projects you reference via CMake add_subdirectories, and whether you have any variants beyond the default Debug and Release? If possible I'd like to approximate your project layout so we can study it in more closely with an eye toward making the experience better for this kind of layout. On Fri, Aug 25, 2017 at 2:46 PM, Jom O'Fisherwrote: > Targets are specified per-Variation so they need to go under the > variation-specific section. Probably something like this: > > defaultConfig { > externalNativeBuild { > cmake { > targets "library1", "library2" > } > } > } > > That should work for you. Let me know. > > On Fri, Aug 25, 2017 at 2:42 PM, Robert Dailey > wrote: > >> By the way when I try to use "targets", I get a failure. Basically >> Gradle doesn't recognize that keyword. I tried singular form as well >> ("target"), no luck. >> >> I'm running canary build of everything possible. What am I missing? >> >> On Wed, Aug 23, 2017 at 4:20 PM, Jom O'Fisher >> wrote: >> > By gradle module projects, I just mean the leaf build.gradle files as >> > opposed to the root build.gradle. By configurations, I mean Build Types >> > (debug vs release) and Product Flavors (demo vs free vs paid). >> Hereafter I >> > will use the term "variant" rather than "configuration" to be precise. >> See >> > this write-up on build variants: >> > >> > https://developer.android.com/studio/build/build-variants.ht >> ml#build-types >> > >> > This build matrix is constructed at the leaf build.gradle level. Native >> > build in gradle allows you to set C/C++ flags individually for each >> variant >> > so that you can define compiler flags (for example, -DFREE_VERSION). >> > >> > One thing to notice at this stage is that the same CMake target may be >> built >> > with different compiler flags across different projects, build types, >> and >> > product flavors. So in the general case, build outputs won't be the >> same. >> > >> > You asked which targets build when specifying path. By default, we >> build all >> > targets that produce an .so. You can override this by setting >> > externalNativeBuild.cmake.targets. For example, >> > >> > paid { >> > ... >> > externalNativeBuild { >> > cmake { >> > ... >> > targets "native-lib-paid" >> > } >> > } >> > } >> > >> > As for your last question, the model we generally see used is that the >> main >> > CMakeLists.txt is next to the leaf build.gradle such that this >> > CMakeLists.txt doesn't couple with peer APK project CMakeLists.txt >> (though >> > they may share common dependencies and settings). Otherwise, multiple >> APK >> > projects would perform pretty much similar to yours--they would build >> > targets per-leaf project and not share build outputs. As far as I can >> see >> > your organization is just as valid so long as you only build the >> targets you >> > need. >> > >> > Regarding native dependencies between java projects. We generally try to >> > avoid making the CMake build depend on the gradle build (you should be >> able >> > to replicate the CMake build from the command-line if you set the right >> > flags). At the moment I don't see a way we could make things better >> without >> > violating that tenet but that could be lack of imagination on my part. >> > >> > We'll definitely be discussing this use case at our next C++ meeting and >> > I'll also be checking for myself whether ccache will work in this CMake >> > scenario. If ccache does work it seems like the natural level at which >> to >> > fold identical builds. >> > >> > >> > >> > On Wed, Aug 23, 2017 at 1:03 PM, Robert Dailey < >> rcdailey.li...@gmail.com> >> > wrote: >> >> >> >> I'm not sure what you mean by "gradle module projects", but maybe >> >> having some examples of what you mean by "configurations, C++ flags, >> >> etc" might make it more clear. >> >> >> >> Question: When specifying "path" for the CMakeLists.txt in the >> >> build.gradle file, how do you know which targets to build? For >> >> example, that run of CMake may generate 100 targets, but only 20 need >> >> to build and be packaged (*.so files) with the APK. Do you just build >> >> "all"? Is there a way to specify the target itself? >> >> >> >> Thanks again. I'd still like to know more about what the ideal >> >> organization is. I find it hard to believe that large android projects >> >> rarely break things up into multiple, separate "components" that are >> >> built independently. That's really the gist of what we're dealing with >> >> here. Your typical "hello world" project likely will have only 1 >> >> CMakeLists.txt
Re: [CMake] CMake + Gradle for Android
Targets are specified per-Variation so they need to go under the variation-specific section. Probably something like this: defaultConfig { externalNativeBuild { cmake { targets "library1", "library2" } } } That should work for you. Let me know. On Fri, Aug 25, 2017 at 2:42 PM, Robert Daileywrote: > By the way when I try to use "targets", I get a failure. Basically > Gradle doesn't recognize that keyword. I tried singular form as well > ("target"), no luck. > > I'm running canary build of everything possible. What am I missing? > > On Wed, Aug 23, 2017 at 4:20 PM, Jom O'Fisher > wrote: > > By gradle module projects, I just mean the leaf build.gradle files as > > opposed to the root build.gradle. By configurations, I mean Build Types > > (debug vs release) and Product Flavors (demo vs free vs paid). Hereafter > I > > will use the term "variant" rather than "configuration" to be precise. > See > > this write-up on build variants: > > > > https://developer.android.com/studio/build/build-variants. > html#build-types > > > > This build matrix is constructed at the leaf build.gradle level. Native > > build in gradle allows you to set C/C++ flags individually for each > variant > > so that you can define compiler flags (for example, -DFREE_VERSION). > > > > One thing to notice at this stage is that the same CMake target may be > built > > with different compiler flags across different projects, build types, and > > product flavors. So in the general case, build outputs won't be the same. > > > > You asked which targets build when specifying path. By default, we build > all > > targets that produce an .so. You can override this by setting > > externalNativeBuild.cmake.targets. For example, > > > > paid { > > ... > > externalNativeBuild { > > cmake { > > ... > > targets "native-lib-paid" > > } > > } > > } > > > > As for your last question, the model we generally see used is that the > main > > CMakeLists.txt is next to the leaf build.gradle such that this > > CMakeLists.txt doesn't couple with peer APK project CMakeLists.txt > (though > > they may share common dependencies and settings). Otherwise, multiple APK > > projects would perform pretty much similar to yours--they would build > > targets per-leaf project and not share build outputs. As far as I can see > > your organization is just as valid so long as you only build the targets > you > > need. > > > > Regarding native dependencies between java projects. We generally try to > > avoid making the CMake build depend on the gradle build (you should be > able > > to replicate the CMake build from the command-line if you set the right > > flags). At the moment I don't see a way we could make things better > without > > violating that tenet but that could be lack of imagination on my part. > > > > We'll definitely be discussing this use case at our next C++ meeting and > > I'll also be checking for myself whether ccache will work in this CMake > > scenario. If ccache does work it seems like the natural level at which to > > fold identical builds. > > > > > > > > On Wed, Aug 23, 2017 at 1:03 PM, Robert Dailey > > > wrote: > >> > >> I'm not sure what you mean by "gradle module projects", but maybe > >> having some examples of what you mean by "configurations, C++ flags, > >> etc" might make it more clear. > >> > >> Question: When specifying "path" for the CMakeLists.txt in the > >> build.gradle file, how do you know which targets to build? For > >> example, that run of CMake may generate 100 targets, but only 20 need > >> to build and be packaged (*.so files) with the APK. Do you just build > >> "all"? Is there a way to specify the target itself? > >> > >> Thanks again. I'd still like to know more about what the ideal > >> organization is. I find it hard to believe that large android projects > >> rarely break things up into multiple, separate "components" that are > >> built independently. That's really the gist of what we're dealing with > >> here. Your typical "hello world" project likely will have only 1 > >> CMakeLists.txt that is pretty self-contained, but all the > >> documentation I've looked at so far doesn't show the best way to > >> handle native library dependencies across java projects between > >> build.gradle files (or maybe I'm just not looking hard enough). > >> > >> On Wed, Aug 23, 2017 at 1:02 PM, Jom O'Fisher > >> wrote: > >> > Thanks for the write-up Robert. Having thought about it, I don't > believe > >> > we > >> > have a satisfying answer at the gradle level for this kind of > >> > organization. > >> > In the gradle model module projects are the unit of organization for > >> > configurations,
Re: [CMake] CMake + Gradle for Android
By the way when I try to use "targets", I get a failure. Basically Gradle doesn't recognize that keyword. I tried singular form as well ("target"), no luck. I'm running canary build of everything possible. What am I missing? On Wed, Aug 23, 2017 at 4:20 PM, Jom O'Fisherwrote: > By gradle module projects, I just mean the leaf build.gradle files as > opposed to the root build.gradle. By configurations, I mean Build Types > (debug vs release) and Product Flavors (demo vs free vs paid). Hereafter I > will use the term "variant" rather than "configuration" to be precise. See > this write-up on build variants: > > https://developer.android.com/studio/build/build-variants.html#build-types > > This build matrix is constructed at the leaf build.gradle level. Native > build in gradle allows you to set C/C++ flags individually for each variant > so that you can define compiler flags (for example, -DFREE_VERSION). > > One thing to notice at this stage is that the same CMake target may be built > with different compiler flags across different projects, build types, and > product flavors. So in the general case, build outputs won't be the same. > > You asked which targets build when specifying path. By default, we build all > targets that produce an .so. You can override this by setting > externalNativeBuild.cmake.targets. For example, > > paid { > ... > externalNativeBuild { > cmake { > ... > targets "native-lib-paid" > } > } > } > > As for your last question, the model we generally see used is that the main > CMakeLists.txt is next to the leaf build.gradle such that this > CMakeLists.txt doesn't couple with peer APK project CMakeLists.txt (though > they may share common dependencies and settings). Otherwise, multiple APK > projects would perform pretty much similar to yours--they would build > targets per-leaf project and not share build outputs. As far as I can see > your organization is just as valid so long as you only build the targets you > need. > > Regarding native dependencies between java projects. We generally try to > avoid making the CMake build depend on the gradle build (you should be able > to replicate the CMake build from the command-line if you set the right > flags). At the moment I don't see a way we could make things better without > violating that tenet but that could be lack of imagination on my part. > > We'll definitely be discussing this use case at our next C++ meeting and > I'll also be checking for myself whether ccache will work in this CMake > scenario. If ccache does work it seems like the natural level at which to > fold identical builds. > > > > On Wed, Aug 23, 2017 at 1:03 PM, Robert Dailey > wrote: >> >> I'm not sure what you mean by "gradle module projects", but maybe >> having some examples of what you mean by "configurations, C++ flags, >> etc" might make it more clear. >> >> Question: When specifying "path" for the CMakeLists.txt in the >> build.gradle file, how do you know which targets to build? For >> example, that run of CMake may generate 100 targets, but only 20 need >> to build and be packaged (*.so files) with the APK. Do you just build >> "all"? Is there a way to specify the target itself? >> >> Thanks again. I'd still like to know more about what the ideal >> organization is. I find it hard to believe that large android projects >> rarely break things up into multiple, separate "components" that are >> built independently. That's really the gist of what we're dealing with >> here. Your typical "hello world" project likely will have only 1 >> CMakeLists.txt that is pretty self-contained, but all the >> documentation I've looked at so far doesn't show the best way to >> handle native library dependencies across java projects between >> build.gradle files (or maybe I'm just not looking hard enough). >> >> On Wed, Aug 23, 2017 at 1:02 PM, Jom O'Fisher >> wrote: >> > Thanks for the write-up Robert. Having thought about it, I don't believe >> > we >> > have a satisfying answer at the gradle level for this kind of >> > organization. >> > In the gradle model module projects are the unit of organization for >> > configurations, C/C++ flags, etc. and that's something we're pretty much >> > stuck with. >> > Regarding just the redundant build issue, would something like ccache >> > help? >> > I know people have used it with ndk-build with success, I'm not sure >> > about >> > CMake but I don't see why that should make a difference. >> > >> > >> > >> > On Tue, Aug 22, 2017 at 10:27 AM, Robert Dailey >> > >> > wrote: >> >> >> >> Another reason to reduce the number of binary directories is that >> >> there are different ways of managing third party libraries. One in >> >> particular that we use is to clone a repository into the binary >> >> directory and build all third party libs in real time based on a >> >> toolchain
Re: [CMake] CMake + Gradle for Android
Thanks for explaining, as usual your answers are making things much more clear. When it's all said and done and considering everything we've discussed up to this point, I'm fine with how you've architected the CMake integration with Gradle. I think the way things function is perfectly fine. My only concern is with a (should I say minor?) implementation detail: Trying to promote CMAKE_BINARY_DIR sharing where feasible to do so. Like I mentioned earlier, I believe that the code-behind for "externalNativeBuild" logic should detect when two "path" files refer to the same physical CMakeLists.txt file within the same build configuration and variant, and if true, reuse/share the same CMAKE_BINARY_DIR instead of generating another one. This seems safe to me since the only difference is possibly which targets get invoked. Optimistically, the best case scenario here is that the 2nd externalNativeBuild has to build nothing and just grab *.so files already built by the first externalNativeProject (so long as both point to the same "path" file on filesystem). Whether or not you decide to specify the "path" at the common ancestor build.gradle (to make managing the configuration in gradle easier since the properties will be transitive) or keep it as it is (require "path" at each leaf build.gradle), you can still check if the same physical CMakeLists.txt file is being used between multiple leaf gradle build files. If ccache is capable of reading build cache between multiple CMake binary dirs, I think it may solve some aspects of this problem: In particular, it might solve the build performance problems (you'd still be building the same libs only once, even across separate CMAKE_BINARY_DIR, if I understand correctly). But it does not solve other issues: In particular, custom_target or custom_command logic that depends on custom timestamp file or caching logic (like, checking if files already exist in CMAKE_BINARY_DIR, and if not, download them, install them, etc. (ExternalProject_Add is a prime example)). Also ccache won't reduce the disk space consumption that would exist due to having multiple CMAKE_BINARY_DIR instead of consolidating and sharing them. Sorry if I'm just repeating myself, but I'm just trying to summarize my thoughts. The situation is complex so I want to make sure I am not leaving out any details for when you do finally discuss this internally. Thanks and let me know how things end up after your C++ meeting! On Wed, Aug 23, 2017 at 4:20 PM, Jom O'Fisherwrote: > By gradle module projects, I just mean the leaf build.gradle files as > opposed to the root build.gradle. By configurations, I mean Build Types > (debug vs release) and Product Flavors (demo vs free vs paid). Hereafter I > will use the term "variant" rather than "configuration" to be precise. See > this write-up on build variants: > > https://developer.android.com/studio/build/build-variants.html#build-types > > This build matrix is constructed at the leaf build.gradle level. Native > build in gradle allows you to set C/C++ flags individually for each variant > so that you can define compiler flags (for example, -DFREE_VERSION). > > One thing to notice at this stage is that the same CMake target may be built > with different compiler flags across different projects, build types, and > product flavors. So in the general case, build outputs won't be the same. > > You asked which targets build when specifying path. By default, we build all > targets that produce an .so. You can override this by setting > externalNativeBuild.cmake.targets. For example, > > paid { > ... > externalNativeBuild { > cmake { > ... > targets "native-lib-paid" > } > } > } > > As for your last question, the model we generally see used is that the main > CMakeLists.txt is next to the leaf build.gradle such that this > CMakeLists.txt doesn't couple with peer APK project CMakeLists.txt (though > they may share common dependencies and settings). Otherwise, multiple APK > projects would perform pretty much similar to yours--they would build > targets per-leaf project and not share build outputs. As far as I can see > your organization is just as valid so long as you only build the targets you > need. > > Regarding native dependencies between java projects. We generally try to > avoid making the CMake build depend on the gradle build (you should be able > to replicate the CMake build from the command-line if you set the right > flags). At the moment I don't see a way we could make things better without > violating that tenet but that could be lack of imagination on my part. > > We'll definitely be discussing this use case at our next C++ meeting and > I'll also be checking for myself whether ccache will work in this CMake > scenario. If ccache does work it seems like the natural level at which to > fold identical builds. > > > > On Wed, Aug 23, 2017 at 1:03 PM, Robert Dailey
Re: [CMake] CMake + Gradle for Android
On Thu, Aug 24, 2017 at 5:20 AM, Jom O'Fisherwrote: > We'll definitely be discussing this use case at our next C++ meeting and > I'll also be checking for myself whether ccache will work in this CMake > scenario. If ccache does work it seems like the natural level at which to > fold identical builds. > In case it's helpful, the following article discusses how to set up a project for ccache without having to assume ccache has been installed with symlinks, etc. to replace the default compiler: https://crascit.com/2016/04/09/using-ccache-with-cmake/ This approach has saved us a huge amount of time in our builds, including some fairly complex hierarchical projects. -- Craig Scott Melbourne, Australia https://crascit.com -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] CMake + Gradle for Android
By gradle module projects, I just mean the leaf build.gradle files as opposed to the root build.gradle. By configurations, I mean Build Types (debug vs release) and Product Flavors (demo vs free vs paid). Hereafter I will use the term "variant" rather than "configuration" to be precise. See this write-up on build variants: https://developer.android.com/studio/build/build-variants.html#build-types This build matrix is constructed at the leaf build.gradle level. Native build in gradle allows you to set C/C++ flags individually for each variant so that you can define compiler flags (for example, -DFREE_VERSION). One thing to notice at this stage is that the same CMake target may be built with different compiler flags across different projects, build types, and product flavors. So in the general case, build outputs won't be the same. You asked which targets build when specifying path. By default, we build all targets that produce an .so. You can override this by setting externalNativeBuild.cmake.targets. For example, paid { ... externalNativeBuild { cmake { ... targets "native-lib-paid" } } } As for your last question, the model we generally see used is that the main CMakeLists.txt is next to the leaf build.gradle such that this CMakeLists.txt doesn't couple with peer APK project CMakeLists.txt (though they may share common dependencies and settings). Otherwise, multiple APK projects would perform pretty much similar to yours--they would build targets per-leaf project and not share build outputs. As far as I can see your organization is just as valid so long as you only build the targets you need. Regarding native dependencies between java projects. We generally try to avoid making the CMake build depend on the gradle build (you should be able to replicate the CMake build from the command-line if you set the right flags). At the moment I don't see a way we could make things better without violating that tenet but that could be lack of imagination on my part. We'll definitely be discussing this use case at our next C++ meeting and I'll also be checking for myself whether ccache will work in this CMake scenario. If ccache does work it seems like the natural level at which to fold identical builds. On Wed, Aug 23, 2017 at 1:03 PM, Robert Daileywrote: > I'm not sure what you mean by "gradle module projects", but maybe > having some examples of what you mean by "configurations, C++ flags, > etc" might make it more clear. > > Question: When specifying "path" for the CMakeLists.txt in the > build.gradle file, how do you know which targets to build? For > example, that run of CMake may generate 100 targets, but only 20 need > to build and be packaged (*.so files) with the APK. Do you just build > "all"? Is there a way to specify the target itself? > > Thanks again. I'd still like to know more about what the ideal > organization is. I find it hard to believe that large android projects > rarely break things up into multiple, separate "components" that are > built independently. That's really the gist of what we're dealing with > here. Your typical "hello world" project likely will have only 1 > CMakeLists.txt that is pretty self-contained, but all the > documentation I've looked at so far doesn't show the best way to > handle native library dependencies across java projects between > build.gradle files (or maybe I'm just not looking hard enough). > > On Wed, Aug 23, 2017 at 1:02 PM, Jom O'Fisher > wrote: > > Thanks for the write-up Robert. Having thought about it, I don't believe > we > > have a satisfying answer at the gradle level for this kind of > organization. > > In the gradle model module projects are the unit of organization for > > configurations, C/C++ flags, etc. and that's something we're pretty much > > stuck with. > > Regarding just the redundant build issue, would something like ccache > help? > > I know people have used it with ndk-build with success, I'm not sure > about > > CMake but I don't see why that should make a difference. > > > > > > > > On Tue, Aug 22, 2017 at 10:27 AM, Robert Dailey < > rcdailey.li...@gmail.com> > > wrote: > >> > >> Another reason to reduce the number of binary directories is that > >> there are different ways of managing third party libraries. One in > >> particular that we use is to clone a repository into the binary > >> directory and build all third party libs in real time based on a > >> toolchain file (Similar to the functionality provided by > >> ExternalProject module in CMake). This is repeated from scratch only > >> if the work hasn't already been done in the binary directory before. > >> By having more binary dirs than needed, this work is being done an > >> exponential amount of times which can result in a lot of wasted time > >> waiting. There are 1 time operations that multiple targets can benefit > >> from in a single binary tree,
Re: [CMake] CMake + Gradle for Android
I'm not sure what you mean by "gradle module projects", but maybe having some examples of what you mean by "configurations, C++ flags, etc" might make it more clear. Question: When specifying "path" for the CMakeLists.txt in the build.gradle file, how do you know which targets to build? For example, that run of CMake may generate 100 targets, but only 20 need to build and be packaged (*.so files) with the APK. Do you just build "all"? Is there a way to specify the target itself? Thanks again. I'd still like to know more about what the ideal organization is. I find it hard to believe that large android projects rarely break things up into multiple, separate "components" that are built independently. That's really the gist of what we're dealing with here. Your typical "hello world" project likely will have only 1 CMakeLists.txt that is pretty self-contained, but all the documentation I've looked at so far doesn't show the best way to handle native library dependencies across java projects between build.gradle files (or maybe I'm just not looking hard enough). On Wed, Aug 23, 2017 at 1:02 PM, Jom O'Fisherwrote: > Thanks for the write-up Robert. Having thought about it, I don't believe we > have a satisfying answer at the gradle level for this kind of organization. > In the gradle model module projects are the unit of organization for > configurations, C/C++ flags, etc. and that's something we're pretty much > stuck with. > Regarding just the redundant build issue, would something like ccache help? > I know people have used it with ndk-build with success, I'm not sure about > CMake but I don't see why that should make a difference. > > > > On Tue, Aug 22, 2017 at 10:27 AM, Robert Dailey > wrote: >> >> Another reason to reduce the number of binary directories is that >> there are different ways of managing third party libraries. One in >> particular that we use is to clone a repository into the binary >> directory and build all third party libs in real time based on a >> toolchain file (Similar to the functionality provided by >> ExternalProject module in CMake). This is repeated from scratch only >> if the work hasn't already been done in the binary directory before. >> By having more binary dirs than needed, this work is being done an >> exponential amount of times which can result in a lot of wasted time >> waiting. There are 1 time operations that multiple targets can benefit >> from in a single binary tree, instead of 1 per unique target being >> invoked. >> >> Sorry to keep responding: I'm just thinking of things as I go and >> bringing them up, to shed light on some of the reasoning behind my >> suggestions. >> >> On Tue, Aug 22, 2017 at 9:26 AM, Robert Dailey >> wrote: >> > Sorry I forgot to answer your last set of questions: >> > >> > CommonLib is indeed 2 things: >> > >> > * A common (static or shared) library for native code (most of our >> > CMake targets specify CommonLib as a link dependency) >> > * A common library for Java code (we do specify this as a dependency >> > for most java targets in Gradle, specifically those under >> > Applications/) >> > >> > On Mon, Aug 21, 2017 at 6:20 PM, Raymond Chiu wrote: >> >> Hi Robert, >> >> >> >> I work with Jom on the Android Studio team, and I would like to clarify >> >> a >> >> few things to better understand your situation. >> >> You mentioned the project is intend to be cross platform. Normally, in >> >> such >> >> situation, we expect there to be a single CMake root project to be >> >> imported >> >> into one of the Android library/application. However, in your case, >> >> there >> >> are subprojects with Java code. >> >> >> >> Are the CMake code in App1/2/3 intended to be cross platform too? Or >> >> are >> >> they Android specific code? If they are meant to be cross platform, >> >> how >> >> does the Java code works on other platforms? Or perhaps you added Java >> >> binding in those subprojects just for Android? >> >> >> >> The build.gradle in CommonLib, what kind of Gradle project is that? >> >> From >> >> your description, it doesn't look like an Android library project. Or >> >> am I >> >> mistaken and it also applies the android library plugin? >> >> >> >> Raymond >> >> >> >> On Mon, Aug 21, 2017 at 3:34 PM, Jom O'Fisher >> >> wrote: >> >>> >> >>> + a colleague >> >>> >> >>> On Mon, Aug 21, 2017 at 3:11 PM, Jom O'Fisher >> >>> wrote: >> >> You can find that number like this: >> - x = number of externalNativeBuild.cmake.path in your build.gradle >> files >> - y = number of gradle configurations (like debug and release) >> - z = number of ABIs that you build >> >> The result is x * y * z. To be more accurate, you should consider y >> and z >> to be functions of each build.gradle file since these can vary. >> >> There is a second set of
Re: [CMake] CMake + Gradle for Android
Thanks for the write-up Robert. Having thought about it, I don't believe we have a satisfying answer at the gradle level for this kind of organization. In the gradle model module projects are the unit of organization for configurations, C/C++ flags, etc. and that's something we're pretty much stuck with. Regarding just the redundant build issue, would something like ccache help? I know people have used it with ndk-build with success, I'm not sure about CMake but I don't see why that should make a difference. On Tue, Aug 22, 2017 at 10:27 AM, Robert Daileywrote: > Another reason to reduce the number of binary directories is that > there are different ways of managing third party libraries. One in > particular that we use is to clone a repository into the binary > directory and build all third party libs in real time based on a > toolchain file (Similar to the functionality provided by > ExternalProject module in CMake). This is repeated from scratch only > if the work hasn't already been done in the binary directory before. > By having more binary dirs than needed, this work is being done an > exponential amount of times which can result in a lot of wasted time > waiting. There are 1 time operations that multiple targets can benefit > from in a single binary tree, instead of 1 per unique target being > invoked. > > Sorry to keep responding: I'm just thinking of things as I go and > bringing them up, to shed light on some of the reasoning behind my > suggestions. > > On Tue, Aug 22, 2017 at 9:26 AM, Robert Dailey > wrote: > > Sorry I forgot to answer your last set of questions: > > > > CommonLib is indeed 2 things: > > > > * A common (static or shared) library for native code (most of our > > CMake targets specify CommonLib as a link dependency) > > * A common library for Java code (we do specify this as a dependency > > for most java targets in Gradle, specifically those under > > Applications/) > > > > On Mon, Aug 21, 2017 at 6:20 PM, Raymond Chiu wrote: > >> Hi Robert, > >> > >> I work with Jom on the Android Studio team, and I would like to clarify > a > >> few things to better understand your situation. > >> You mentioned the project is intend to be cross platform. Normally, in > such > >> situation, we expect there to be a single CMake root project to be > imported > >> into one of the Android library/application. However, in your case, > there > >> are subprojects with Java code. > >> > >> Are the CMake code in App1/2/3 intended to be cross platform too? Or > are > >> they Android specific code? If they are meant to be cross platform, how > >> does the Java code works on other platforms? Or perhaps you added Java > >> binding in those subprojects just for Android? > >> > >> The build.gradle in CommonLib, what kind of Gradle project is that? > From > >> your description, it doesn't look like an Android library project. Or > am I > >> mistaken and it also applies the android library plugin? > >> > >> Raymond > >> > >> On Mon, Aug 21, 2017 at 3:34 PM, Jom O'Fisher > wrote: > >>> > >>> + a colleague > >>> > >>> On Mon, Aug 21, 2017 at 3:11 PM, Jom O'Fisher > >>> wrote: > > You can find that number like this: > - x = number of externalNativeBuild.cmake.path in your build.gradle > files > - y = number of gradle configurations (like debug and release) > - z = number of ABIs that you build > > The result is x * y * z. To be more accurate, you should consider y > and z > to be functions of each build.gradle file since these can vary. > > There is a second set of folders that hold the stripped versions of > the > .so files that is purely managed by the android gradle plugin, so you > might > consider the answer to be 2 * x * y * z. > > Hope this helps. > > > > > > > On Mon, Aug 21, 2017 at 2:41 PM, Robert Dailey < > rcdailey.li...@gmail.com> > wrote: > > > > This definitely a bit better, but still requires the boilerplate in > > each leaf gradle file. But I can't seriously complain too much. I > > think I'm more concerned with the implications this has underneath. > > First, let me ask just to make sure I'm not misunderstanding: Does > > each `externalNativeBuild` entry essentially mean 1 CMAKE_BINARY_DIR? > > How many binary dirs do you manage internally and what determines > when > > they get created? > > > > On Mon, Aug 21, 2017 at 2:35 PM, Jom O'Fisher > > wrote: > > > Would it work for your scenario to provide properties in the root > > > build.gradle: > > > > > > ext { > > > cmakePath = file "CMakeLists.txt" > > > } > > > > > > And then consume them in the leaf app/build.gradle like this? > > > > > > externalNativeBuild { > > > cmake { > > >
Re: [CMake] CMake + Gradle for Android
Another reason to reduce the number of binary directories is that there are different ways of managing third party libraries. One in particular that we use is to clone a repository into the binary directory and build all third party libs in real time based on a toolchain file (Similar to the functionality provided by ExternalProject module in CMake). This is repeated from scratch only if the work hasn't already been done in the binary directory before. By having more binary dirs than needed, this work is being done an exponential amount of times which can result in a lot of wasted time waiting. There are 1 time operations that multiple targets can benefit from in a single binary tree, instead of 1 per unique target being invoked. Sorry to keep responding: I'm just thinking of things as I go and bringing them up, to shed light on some of the reasoning behind my suggestions. On Tue, Aug 22, 2017 at 9:26 AM, Robert Daileywrote: > Sorry I forgot to answer your last set of questions: > > CommonLib is indeed 2 things: > > * A common (static or shared) library for native code (most of our > CMake targets specify CommonLib as a link dependency) > * A common library for Java code (we do specify this as a dependency > for most java targets in Gradle, specifically those under > Applications/) > > On Mon, Aug 21, 2017 at 6:20 PM, Raymond Chiu wrote: >> Hi Robert, >> >> I work with Jom on the Android Studio team, and I would like to clarify a >> few things to better understand your situation. >> You mentioned the project is intend to be cross platform. Normally, in such >> situation, we expect there to be a single CMake root project to be imported >> into one of the Android library/application. However, in your case, there >> are subprojects with Java code. >> >> Are the CMake code in App1/2/3 intended to be cross platform too? Or are >> they Android specific code? If they are meant to be cross platform, how >> does the Java code works on other platforms? Or perhaps you added Java >> binding in those subprojects just for Android? >> >> The build.gradle in CommonLib, what kind of Gradle project is that? From >> your description, it doesn't look like an Android library project. Or am I >> mistaken and it also applies the android library plugin? >> >> Raymond >> >> On Mon, Aug 21, 2017 at 3:34 PM, Jom O'Fisher wrote: >>> >>> + a colleague >>> >>> On Mon, Aug 21, 2017 at 3:11 PM, Jom O'Fisher >>> wrote: You can find that number like this: - x = number of externalNativeBuild.cmake.path in your build.gradle files - y = number of gradle configurations (like debug and release) - z = number of ABIs that you build The result is x * y * z. To be more accurate, you should consider y and z to be functions of each build.gradle file since these can vary. There is a second set of folders that hold the stripped versions of the .so files that is purely managed by the android gradle plugin, so you might consider the answer to be 2 * x * y * z. Hope this helps. On Mon, Aug 21, 2017 at 2:41 PM, Robert Dailey wrote: > > This definitely a bit better, but still requires the boilerplate in > each leaf gradle file. But I can't seriously complain too much. I > think I'm more concerned with the implications this has underneath. > First, let me ask just to make sure I'm not misunderstanding: Does > each `externalNativeBuild` entry essentially mean 1 CMAKE_BINARY_DIR? > How many binary dirs do you manage internally and what determines when > they get created? > > On Mon, Aug 21, 2017 at 2:35 PM, Jom O'Fisher > wrote: > > Would it work for your scenario to provide properties in the root > > build.gradle: > > > > ext { > > cmakePath = file "CMakeLists.txt" > > } > > > > And then consume them in the leaf app/build.gradle like this? > > > > externalNativeBuild { > > cmake { > > path cmakePath > > } > > } > > > > It doesn't fully hide the details but it does centralize the > > information. > > > > > > On Mon, Aug 21, 2017 at 11:20 AM, Robert Dailey > > > > wrote: > >> > >> I wouldn't want to do that, it's too convoluted. I have other > >> platforms that use these CMake scripts as well. For example, I run on > >> Windows and Linux platforms as well to build the native code. Normal > >> CMake behavior is designed to work at a root then go downwards to > >> find > >> targets. However it seems Gradle wants to start at a subdirectory and > >> work its way up to the root, which is opposite of CMake's intended > >> behavior IMHO. Not only that but I want to avoid special-casing > >>
Re: [CMake] CMake + Gradle for Android
Sorry I forgot to answer your last set of questions: CommonLib is indeed 2 things: * A common (static or shared) library for native code (most of our CMake targets specify CommonLib as a link dependency) * A common library for Java code (we do specify this as a dependency for most java targets in Gradle, specifically those under Applications/) On Mon, Aug 21, 2017 at 6:20 PM, Raymond Chiuwrote: > Hi Robert, > > I work with Jom on the Android Studio team, and I would like to clarify a > few things to better understand your situation. > You mentioned the project is intend to be cross platform. Normally, in such > situation, we expect there to be a single CMake root project to be imported > into one of the Android library/application. However, in your case, there > are subprojects with Java code. > > Are the CMake code in App1/2/3 intended to be cross platform too? Or are > they Android specific code? If they are meant to be cross platform, how > does the Java code works on other platforms? Or perhaps you added Java > binding in those subprojects just for Android? > > The build.gradle in CommonLib, what kind of Gradle project is that? From > your description, it doesn't look like an Android library project. Or am I > mistaken and it also applies the android library plugin? > > Raymond > > On Mon, Aug 21, 2017 at 3:34 PM, Jom O'Fisher wrote: >> >> + a colleague >> >> On Mon, Aug 21, 2017 at 3:11 PM, Jom O'Fisher >> wrote: >>> >>> You can find that number like this: >>> - x = number of externalNativeBuild.cmake.path in your build.gradle files >>> - y = number of gradle configurations (like debug and release) >>> - z = number of ABIs that you build >>> >>> The result is x * y * z. To be more accurate, you should consider y and z >>> to be functions of each build.gradle file since these can vary. >>> >>> There is a second set of folders that hold the stripped versions of the >>> .so files that is purely managed by the android gradle plugin, so you might >>> consider the answer to be 2 * x * y * z. >>> >>> Hope this helps. >>> >>> >>> >>> >>> >>> >>> On Mon, Aug 21, 2017 at 2:41 PM, Robert Dailey >>> wrote: This definitely a bit better, but still requires the boilerplate in each leaf gradle file. But I can't seriously complain too much. I think I'm more concerned with the implications this has underneath. First, let me ask just to make sure I'm not misunderstanding: Does each `externalNativeBuild` entry essentially mean 1 CMAKE_BINARY_DIR? How many binary dirs do you manage internally and what determines when they get created? On Mon, Aug 21, 2017 at 2:35 PM, Jom O'Fisher wrote: > Would it work for your scenario to provide properties in the root > build.gradle: > > ext { > cmakePath = file "CMakeLists.txt" > } > > And then consume them in the leaf app/build.gradle like this? > > externalNativeBuild { > cmake { > path cmakePath > } > } > > It doesn't fully hide the details but it does centralize the > information. > > > On Mon, Aug 21, 2017 at 11:20 AM, Robert Dailey > > wrote: >> >> I wouldn't want to do that, it's too convoluted. I have other >> platforms that use these CMake scripts as well. For example, I run on >> Windows and Linux platforms as well to build the native code. Normal >> CMake behavior is designed to work at a root then go downwards to >> find >> targets. However it seems Gradle wants to start at a subdirectory and >> work its way up to the root, which is opposite of CMake's intended >> behavior IMHO. Not only that but I want to avoid special-casing >> behavior in CMake just for Android's use. >> >> At the moment it feels like (again referring back to my previous >> example structure) that both App2 and App3 each run CMake in >> independent binary directories instead of sharing 1 binary directory >> and building 2 targets inside of it. I prefer this behavior instead, >> especially since it allows CMake to operate as it was intended. I >> think it's a common case that projects will define multiple targets >> starting from a single root, and expect multiple APKs or java >> dependencies to be built within it. >> >> If I'm misunderstanding or making false assumptions please let me >> know. >> >> >> >> On Mon, Aug 21, 2017 at 12:00 PM, Jom O'Fisher >> wrote: >> > Would it work for your situation for the leaf CMakeLists.txt to >> > include >> > the >> > root CMakeLists.txt? Then have the leaf-specific logic in the leaf >> > CMakeLists.txt? >> > >> > >> > >> > On Mon, Aug
Re: [CMake] CMake + Gradle for Android
Thanks to both of you for responding. First, to Jom's reply: The "x" part is what I was worried about. Each "path" resulting in a single binary dir. This is the part that I think could be optimized. I'll explain more on this later. Note also that this optimization might only benefit my specific structure, but I'd also like to talk about that a bit more to understand if the structure itself should be changed (of course any changes I can do will be limited and might be very involved, but still we can hash out different ideas). So by "cross platform" here I mean that we build our C++ code (using CMake to facilitate the build) on 4 different platforms at the moment: - Windows using MSVC 2015 (We manage a "simulator" for our Android apps via Win32 apps) - Linux x86 (Ubuntu) using system Clang compiler (we use this to run our unit tests) - Android x86 - Android ARM All of our android apps are basically games. They are probably 95% C++ code. We limit logic to java as much as possible because we want behavior to be as cross platform as possible. Java code pretty much is the minimum required. Enough to load our SO library files and do some basic activity management (like going into background, setting up opengl, etc) Our root CMakeLists.txt does just a few things: * Include our common CMake modules (that we manage) that set up a few convenient CMake functions for creating targets, setting up unit tests, including third party libs, etc. * Runs add_subdirectory() to start including the sub-projects in our tree The root CMakeLists.txt is extremely important because it sets up our "CMake Environment", if you will, but doesn't actually define any targets by itself. All CMakeLists.txt below it depend on the root script being executed first, because they depend on the functions & such that it defines. Once CMake steps into "Applications", there is another CMakeLists.txt that includes more directories. Each sibling directory represents the root of a gradle project. Each of these has its own build.gradle inside it. We use gradle to manage dependencies across applications for Java dependencies. CMake maintains dependencies across apps for dependencies on the native side. Using App2 as an example, here is how the behavior differs per platform: * Windows: Includes certain Windows-only CPP files (e.g. win32main.cpp). This will set up the Win32 window, WinMain entry point, etc. Basically everything required to run this code on Windows (game will render to a window using OpenGL). Output is an executable target (.exe). * Android: Include Android-only CPP files (e.g. androidmain.cpp). This defines functions like JNI_OnLoad(), android_main(), sets up JNI bindings, and whatever else is required for our game to run on Android. Output is a shared library target (.so) for packaging into APK by gradle. * Linux: Include linux-only files, mainly for running unit tests specific to App2. Output is an executable target that runs various test cases. Most apps follow this pattern shown above. Each App# has mostly CPP files that are built common to all platforms. Note that this way of managing applications and libraries is how we keep our code base modular. We do not structure anything specific to a particular platform, we chose this structure because (up until gradle) it worked well between our various build platforms. Ideally, now that I understand how CMake is being managed by Gradle, I'd like CMake to be managed as follows: * The root build.gradle points to the "entry point" script for CMake (this is our root CMakeLists.txt that does not define any targets). This yields 1 binary directory per platform + configuration combination (y * z) but does not duplicate it per sub-project (this gets rid of 'x'). Example of what would be in the root build.gradle (or gradle settings?) (note that this would not yield an actual java target in gradle, it's just some property definition used by leaf build gradle files; so i'm not sure if this is the appropriate way to define that): externalNativeBuild { cmake { path CMakeLists.txt } } * Each sub-project build.gradle has a new property under externalNativeBuild called "cmake_target" or something, where I specify the native target that should be built in the single binary directory for that platform & configuration. So for App2's build.gradle this would be: externalNativeBuild { cmake { target App2 } } This would error out if a `path` has not been defined at this or some ancestor gradle script (assuming that gradle properties are transitive like CMake's) This structure seems a lot better to be. Again, it definitely benefits our specific structure but I also am not sure if we're an exception to the rule. It seems difficult to decompose and modularize a code base without doing things this way, especially when it needs to work for platforms other than Android itself. On Mon, Aug 21, 2017 at 6:20 PM, Raymond Chiuwrote: > Hi Robert, > > I work
Re: [CMake] CMake + Gradle for Android
+ a colleague On Mon, Aug 21, 2017 at 3:11 PM, Jom O'Fisherwrote: > You can find that number like this: > - x = number of externalNativeBuild.cmake.path in your build.gradle files > - y = number of gradle configurations (like debug and release) > - z = number of ABIs that you build > > The result is x * y * z. To be more accurate, you should consider y and z > to be functions of each build.gradle file since these can vary. > > There is a second set of folders that hold the stripped versions of the > .so files that is purely managed by the android gradle plugin, so you might > consider the answer to be 2 * x * y * z. > > Hope this helps. > > > > > > > On Mon, Aug 21, 2017 at 2:41 PM, Robert Dailey > wrote: > >> This definitely a bit better, but still requires the boilerplate in >> each leaf gradle file. But I can't seriously complain too much. I >> think I'm more concerned with the implications this has underneath. >> First, let me ask just to make sure I'm not misunderstanding: Does >> each `externalNativeBuild` entry essentially mean 1 CMAKE_BINARY_DIR? >> How many binary dirs do you manage internally and what determines when >> they get created? >> >> On Mon, Aug 21, 2017 at 2:35 PM, Jom O'Fisher >> wrote: >> > Would it work for your scenario to provide properties in the root >> > build.gradle: >> > >> > ext { >> > cmakePath = file "CMakeLists.txt" >> > } >> > >> > And then consume them in the leaf app/build.gradle like this? >> > >> > externalNativeBuild { >> > cmake { >> > path cmakePath >> > } >> > } >> > >> > It doesn't fully hide the details but it does centralize the >> information. >> > >> > >> > On Mon, Aug 21, 2017 at 11:20 AM, Robert Dailey < >> rcdailey.li...@gmail.com> >> > wrote: >> >> >> >> I wouldn't want to do that, it's too convoluted. I have other >> >> platforms that use these CMake scripts as well. For example, I run on >> >> Windows and Linux platforms as well to build the native code. Normal >> >> CMake behavior is designed to work at a root then go downwards to find >> >> targets. However it seems Gradle wants to start at a subdirectory and >> >> work its way up to the root, which is opposite of CMake's intended >> >> behavior IMHO. Not only that but I want to avoid special-casing >> >> behavior in CMake just for Android's use. >> >> >> >> At the moment it feels like (again referring back to my previous >> >> example structure) that both App2 and App3 each run CMake in >> >> independent binary directories instead of sharing 1 binary directory >> >> and building 2 targets inside of it. I prefer this behavior instead, >> >> especially since it allows CMake to operate as it was intended. I >> >> think it's a common case that projects will define multiple targets >> >> starting from a single root, and expect multiple APKs or java >> >> dependencies to be built within it. >> >> >> >> If I'm misunderstanding or making false assumptions please let me know. >> >> >> >> >> >> >> >> On Mon, Aug 21, 2017 at 12:00 PM, Jom O'Fisher >> >> wrote: >> >> > Would it work for your situation for the leaf CMakeLists.txt to >> include >> >> > the >> >> > root CMakeLists.txt? Then have the leaf-specific logic in the leaf >> >> > CMakeLists.txt? >> >> > >> >> > >> >> > >> >> > On Mon, Aug 21, 2017 at 9:33 AM, Robert Dailey >> >> > >> >> > wrote: >> >> >> >> >> >> Basically, yes. We have this sort of structure: >> >> >> >> >> >> / >> >> >> Applications/ >> >> >> App1/ >> >> >> build.gradle >> >> >> CMakeLists.txt >> >> >> App2/ >> >> >> build.gradle >> >> >> CMakeLists.txt >> >> >> App3/ >> >> >> build.gradle >> >> >> CMakeLists.txt >> >> >> CommonLib/ >> >> >> build.gradle >> >> >> CMakeLists.txt >> >> >> CMakeLists.txt >> >> >> >> >> >> The libs are defined as follows: >> >> >> >> >> >> * CommonLib is a static library (java code builds into a library) >> >> >> * No dependencies of its own >> >> >> * App1 is a shared library (java code builds into a library) >> >> >> * Dependencies (both java & native): CommonLib >> >> >> * App2 is a shared library (java code builds into an APK) >> >> >>* Dependencies (both java & native): App1, CommonLib >> >> >> * App3 is a shared library (java code builds into an APK) >> >> >>* Dependencies (both java & native): CommonLib >> >> >> >> >> >> In all cases, CMake must be invoked starting at the root >> >> >> CMakeLists.txt 1 time. Each target can be built from the same binary >> >> >> directory after that. Previously with ANT, I was building all native >> >> >> targets first, then moved libs to appropriate directories so that >> the >> >> >> 'ant' command would package the libs. >> >> >> >> >> >> For gradle, I wanted to avoid redundantly specifying the root >> >> >> directory in each
Re: [CMake] CMake + Gradle for Android
You can find that number like this: - x = number of externalNativeBuild.cmake.path in your build.gradle files - y = number of gradle configurations (like debug and release) - z = number of ABIs that you build The result is x * y * z. To be more accurate, you should consider y and z to be functions of each build.gradle file since these can vary. There is a second set of folders that hold the stripped versions of the .so files that is purely managed by the android gradle plugin, so you might consider the answer to be 2 * x * y * z. Hope this helps. On Mon, Aug 21, 2017 at 2:41 PM, Robert Daileywrote: > This definitely a bit better, but still requires the boilerplate in > each leaf gradle file. But I can't seriously complain too much. I > think I'm more concerned with the implications this has underneath. > First, let me ask just to make sure I'm not misunderstanding: Does > each `externalNativeBuild` entry essentially mean 1 CMAKE_BINARY_DIR? > How many binary dirs do you manage internally and what determines when > they get created? > > On Mon, Aug 21, 2017 at 2:35 PM, Jom O'Fisher > wrote: > > Would it work for your scenario to provide properties in the root > > build.gradle: > > > > ext { > > cmakePath = file "CMakeLists.txt" > > } > > > > And then consume them in the leaf app/build.gradle like this? > > > > externalNativeBuild { > > cmake { > > path cmakePath > > } > > } > > > > It doesn't fully hide the details but it does centralize the information. > > > > > > On Mon, Aug 21, 2017 at 11:20 AM, Robert Dailey < > rcdailey.li...@gmail.com> > > wrote: > >> > >> I wouldn't want to do that, it's too convoluted. I have other > >> platforms that use these CMake scripts as well. For example, I run on > >> Windows and Linux platforms as well to build the native code. Normal > >> CMake behavior is designed to work at a root then go downwards to find > >> targets. However it seems Gradle wants to start at a subdirectory and > >> work its way up to the root, which is opposite of CMake's intended > >> behavior IMHO. Not only that but I want to avoid special-casing > >> behavior in CMake just for Android's use. > >> > >> At the moment it feels like (again referring back to my previous > >> example structure) that both App2 and App3 each run CMake in > >> independent binary directories instead of sharing 1 binary directory > >> and building 2 targets inside of it. I prefer this behavior instead, > >> especially since it allows CMake to operate as it was intended. I > >> think it's a common case that projects will define multiple targets > >> starting from a single root, and expect multiple APKs or java > >> dependencies to be built within it. > >> > >> If I'm misunderstanding or making false assumptions please let me know. > >> > >> > >> > >> On Mon, Aug 21, 2017 at 12:00 PM, Jom O'Fisher > >> wrote: > >> > Would it work for your situation for the leaf CMakeLists.txt to > include > >> > the > >> > root CMakeLists.txt? Then have the leaf-specific logic in the leaf > >> > CMakeLists.txt? > >> > > >> > > >> > > >> > On Mon, Aug 21, 2017 at 9:33 AM, Robert Dailey > >> > > >> > wrote: > >> >> > >> >> Basically, yes. We have this sort of structure: > >> >> > >> >> / > >> >> Applications/ > >> >> App1/ > >> >> build.gradle > >> >> CMakeLists.txt > >> >> App2/ > >> >> build.gradle > >> >> CMakeLists.txt > >> >> App3/ > >> >> build.gradle > >> >> CMakeLists.txt > >> >> CommonLib/ > >> >> build.gradle > >> >> CMakeLists.txt > >> >> CMakeLists.txt > >> >> > >> >> The libs are defined as follows: > >> >> > >> >> * CommonLib is a static library (java code builds into a library) > >> >> * No dependencies of its own > >> >> * App1 is a shared library (java code builds into a library) > >> >> * Dependencies (both java & native): CommonLib > >> >> * App2 is a shared library (java code builds into an APK) > >> >>* Dependencies (both java & native): App1, CommonLib > >> >> * App3 is a shared library (java code builds into an APK) > >> >>* Dependencies (both java & native): CommonLib > >> >> > >> >> In all cases, CMake must be invoked starting at the root > >> >> CMakeLists.txt 1 time. Each target can be built from the same binary > >> >> directory after that. Previously with ANT, I was building all native > >> >> targets first, then moved libs to appropriate directories so that the > >> >> 'ant' command would package the libs. > >> >> > >> >> For gradle, I wanted to avoid redundantly specifying the root > >> >> directory in each leaf-level project directory. Using the example > >> >> above, the leaf-level directories in this case would be App1, App2, > >> >> App3, and CommonLib. However I think we only specify the native CMake > >> >> stuff for the java targets that
Re: [CMake] CMake + Gradle for Android
This definitely a bit better, but still requires the boilerplate in each leaf gradle file. But I can't seriously complain too much. I think I'm more concerned with the implications this has underneath. First, let me ask just to make sure I'm not misunderstanding: Does each `externalNativeBuild` entry essentially mean 1 CMAKE_BINARY_DIR? How many binary dirs do you manage internally and what determines when they get created? On Mon, Aug 21, 2017 at 2:35 PM, Jom O'Fisherwrote: > Would it work for your scenario to provide properties in the root > build.gradle: > > ext { > cmakePath = file "CMakeLists.txt" > } > > And then consume them in the leaf app/build.gradle like this? > > externalNativeBuild { > cmake { > path cmakePath > } > } > > It doesn't fully hide the details but it does centralize the information. > > > On Mon, Aug 21, 2017 at 11:20 AM, Robert Dailey > wrote: >> >> I wouldn't want to do that, it's too convoluted. I have other >> platforms that use these CMake scripts as well. For example, I run on >> Windows and Linux platforms as well to build the native code. Normal >> CMake behavior is designed to work at a root then go downwards to find >> targets. However it seems Gradle wants to start at a subdirectory and >> work its way up to the root, which is opposite of CMake's intended >> behavior IMHO. Not only that but I want to avoid special-casing >> behavior in CMake just for Android's use. >> >> At the moment it feels like (again referring back to my previous >> example structure) that both App2 and App3 each run CMake in >> independent binary directories instead of sharing 1 binary directory >> and building 2 targets inside of it. I prefer this behavior instead, >> especially since it allows CMake to operate as it was intended. I >> think it's a common case that projects will define multiple targets >> starting from a single root, and expect multiple APKs or java >> dependencies to be built within it. >> >> If I'm misunderstanding or making false assumptions please let me know. >> >> >> >> On Mon, Aug 21, 2017 at 12:00 PM, Jom O'Fisher >> wrote: >> > Would it work for your situation for the leaf CMakeLists.txt to include >> > the >> > root CMakeLists.txt? Then have the leaf-specific logic in the leaf >> > CMakeLists.txt? >> > >> > >> > >> > On Mon, Aug 21, 2017 at 9:33 AM, Robert Dailey >> > >> > wrote: >> >> >> >> Basically, yes. We have this sort of structure: >> >> >> >> / >> >> Applications/ >> >> App1/ >> >> build.gradle >> >> CMakeLists.txt >> >> App2/ >> >> build.gradle >> >> CMakeLists.txt >> >> App3/ >> >> build.gradle >> >> CMakeLists.txt >> >> CommonLib/ >> >> build.gradle >> >> CMakeLists.txt >> >> CMakeLists.txt >> >> >> >> The libs are defined as follows: >> >> >> >> * CommonLib is a static library (java code builds into a library) >> >> * No dependencies of its own >> >> * App1 is a shared library (java code builds into a library) >> >> * Dependencies (both java & native): CommonLib >> >> * App2 is a shared library (java code builds into an APK) >> >>* Dependencies (both java & native): App1, CommonLib >> >> * App3 is a shared library (java code builds into an APK) >> >>* Dependencies (both java & native): CommonLib >> >> >> >> In all cases, CMake must be invoked starting at the root >> >> CMakeLists.txt 1 time. Each target can be built from the same binary >> >> directory after that. Previously with ANT, I was building all native >> >> targets first, then moved libs to appropriate directories so that the >> >> 'ant' command would package the libs. >> >> >> >> For gradle, I wanted to avoid redundantly specifying the root >> >> directory in each leaf-level project directory. Using the example >> >> above, the leaf-level directories in this case would be App1, App2, >> >> App3, and CommonLib. However I think we only specify the native CMake >> >> stuff for the java targets that actually output an APK (that would be >> >> App2 and App3 only). >> >> >> >> The ultimate goal is to specify stuff that doesn't change per >> >> independent "module" of ours at the top level so it is transitive / >> >> inherited. Then only specify the differences (e.g. the native CMake >> >> target to build) in the leaf build gradle files. However you indicated >> >> this isn't possible. >> >> >> >> >> >> >> >> On Mon, Aug 21, 2017 at 11:11 AM, Jom O'Fisher >> >> wrote: >> >> > What you're doing already sounds correct. You can't directly specify >> >> > CMakeLists.txt from the top-level build.gradle. Recommendation is >> >> > that >> >> > it >> >> > should be specified from the build.gradle of the module of the APK. >> >> > Is >> >> > the >> >> > issue that you have multiple APK modules that all reference the same >> >> > CMake
Re: [CMake] CMake + Gradle for Android
Would it work for your scenario to provide properties in the root build.gradle: ext { cmakePath = file "CMakeLists.txt" } And then consume them in the leaf app/build.gradle like this? externalNativeBuild { cmake { path cmakePath } } It doesn't fully hide the details but it does centralize the information. On Mon, Aug 21, 2017 at 11:20 AM, Robert Daileywrote: > I wouldn't want to do that, it's too convoluted. I have other > platforms that use these CMake scripts as well. For example, I run on > Windows and Linux platforms as well to build the native code. Normal > CMake behavior is designed to work at a root then go downwards to find > targets. However it seems Gradle wants to start at a subdirectory and > work its way up to the root, which is opposite of CMake's intended > behavior IMHO. Not only that but I want to avoid special-casing > behavior in CMake just for Android's use. > > At the moment it feels like (again referring back to my previous > example structure) that both App2 and App3 each run CMake in > independent binary directories instead of sharing 1 binary directory > and building 2 targets inside of it. I prefer this behavior instead, > especially since it allows CMake to operate as it was intended. I > think it's a common case that projects will define multiple targets > starting from a single root, and expect multiple APKs or java > dependencies to be built within it. > > If I'm misunderstanding or making false assumptions please let me know. > > > > On Mon, Aug 21, 2017 at 12:00 PM, Jom O'Fisher > wrote: > > Would it work for your situation for the leaf CMakeLists.txt to include > the > > root CMakeLists.txt? Then have the leaf-specific logic in the leaf > > CMakeLists.txt? > > > > > > > > On Mon, Aug 21, 2017 at 9:33 AM, Robert Dailey > > > wrote: > >> > >> Basically, yes. We have this sort of structure: > >> > >> / > >> Applications/ > >> App1/ > >> build.gradle > >> CMakeLists.txt > >> App2/ > >> build.gradle > >> CMakeLists.txt > >> App3/ > >> build.gradle > >> CMakeLists.txt > >> CommonLib/ > >> build.gradle > >> CMakeLists.txt > >> CMakeLists.txt > >> > >> The libs are defined as follows: > >> > >> * CommonLib is a static library (java code builds into a library) > >> * No dependencies of its own > >> * App1 is a shared library (java code builds into a library) > >> * Dependencies (both java & native): CommonLib > >> * App2 is a shared library (java code builds into an APK) > >>* Dependencies (both java & native): App1, CommonLib > >> * App3 is a shared library (java code builds into an APK) > >>* Dependencies (both java & native): CommonLib > >> > >> In all cases, CMake must be invoked starting at the root > >> CMakeLists.txt 1 time. Each target can be built from the same binary > >> directory after that. Previously with ANT, I was building all native > >> targets first, then moved libs to appropriate directories so that the > >> 'ant' command would package the libs. > >> > >> For gradle, I wanted to avoid redundantly specifying the root > >> directory in each leaf-level project directory. Using the example > >> above, the leaf-level directories in this case would be App1, App2, > >> App3, and CommonLib. However I think we only specify the native CMake > >> stuff for the java targets that actually output an APK (that would be > >> App2 and App3 only). > >> > >> The ultimate goal is to specify stuff that doesn't change per > >> independent "module" of ours at the top level so it is transitive / > >> inherited. Then only specify the differences (e.g. the native CMake > >> target to build) in the leaf build gradle files. However you indicated > >> this isn't possible. > >> > >> > >> > >> On Mon, Aug 21, 2017 at 11:11 AM, Jom O'Fisher > >> wrote: > >> > What you're doing already sounds correct. You can't directly specify > >> > CMakeLists.txt from the top-level build.gradle. Recommendation is that > >> > it > >> > should be specified from the build.gradle of the module of the APK. Is > >> > the > >> > issue that you have multiple APK modules that all reference the same > >> > CMake > >> > libraries? > >> > > >> > On Mon, Aug 21, 2017 at 9:00 AM, Robert Dailey > >> > > >> > wrote: > >> >> > >> >> Thanks this is very helpful. The other question I have is: Is there a > >> >> place to centrally specify the root CMakeLists.txt? Basically, I want > >> >> to specify the CMake root in 1 place, and have targets (defined > >> >> further down in subdirectories) that require APK packaging to specify > >> >> only the native target name that should be built & packaged. > >> >> > >> >> At the moment we specify the root CMakeLists.txt by walking up the > >> >> tree, paths like "../../../../CMakeLists.txt". I
Re: [CMake] CMake + Gradle for Android
I wouldn't want to do that, it's too convoluted. I have other platforms that use these CMake scripts as well. For example, I run on Windows and Linux platforms as well to build the native code. Normal CMake behavior is designed to work at a root then go downwards to find targets. However it seems Gradle wants to start at a subdirectory and work its way up to the root, which is opposite of CMake's intended behavior IMHO. Not only that but I want to avoid special-casing behavior in CMake just for Android's use. At the moment it feels like (again referring back to my previous example structure) that both App2 and App3 each run CMake in independent binary directories instead of sharing 1 binary directory and building 2 targets inside of it. I prefer this behavior instead, especially since it allows CMake to operate as it was intended. I think it's a common case that projects will define multiple targets starting from a single root, and expect multiple APKs or java dependencies to be built within it. If I'm misunderstanding or making false assumptions please let me know. On Mon, Aug 21, 2017 at 12:00 PM, Jom O'Fisherwrote: > Would it work for your situation for the leaf CMakeLists.txt to include the > root CMakeLists.txt? Then have the leaf-specific logic in the leaf > CMakeLists.txt? > > > > On Mon, Aug 21, 2017 at 9:33 AM, Robert Dailey > wrote: >> >> Basically, yes. We have this sort of structure: >> >> / >> Applications/ >> App1/ >> build.gradle >> CMakeLists.txt >> App2/ >> build.gradle >> CMakeLists.txt >> App3/ >> build.gradle >> CMakeLists.txt >> CommonLib/ >> build.gradle >> CMakeLists.txt >> CMakeLists.txt >> >> The libs are defined as follows: >> >> * CommonLib is a static library (java code builds into a library) >> * No dependencies of its own >> * App1 is a shared library (java code builds into a library) >> * Dependencies (both java & native): CommonLib >> * App2 is a shared library (java code builds into an APK) >>* Dependencies (both java & native): App1, CommonLib >> * App3 is a shared library (java code builds into an APK) >>* Dependencies (both java & native): CommonLib >> >> In all cases, CMake must be invoked starting at the root >> CMakeLists.txt 1 time. Each target can be built from the same binary >> directory after that. Previously with ANT, I was building all native >> targets first, then moved libs to appropriate directories so that the >> 'ant' command would package the libs. >> >> For gradle, I wanted to avoid redundantly specifying the root >> directory in each leaf-level project directory. Using the example >> above, the leaf-level directories in this case would be App1, App2, >> App3, and CommonLib. However I think we only specify the native CMake >> stuff for the java targets that actually output an APK (that would be >> App2 and App3 only). >> >> The ultimate goal is to specify stuff that doesn't change per >> independent "module" of ours at the top level so it is transitive / >> inherited. Then only specify the differences (e.g. the native CMake >> target to build) in the leaf build gradle files. However you indicated >> this isn't possible. >> >> >> >> On Mon, Aug 21, 2017 at 11:11 AM, Jom O'Fisher >> wrote: >> > What you're doing already sounds correct. You can't directly specify >> > CMakeLists.txt from the top-level build.gradle. Recommendation is that >> > it >> > should be specified from the build.gradle of the module of the APK. Is >> > the >> > issue that you have multiple APK modules that all reference the same >> > CMake >> > libraries? >> > >> > On Mon, Aug 21, 2017 at 9:00 AM, Robert Dailey >> > >> > wrote: >> >> >> >> Thanks this is very helpful. The other question I have is: Is there a >> >> place to centrally specify the root CMakeLists.txt? Basically, I want >> >> to specify the CMake root in 1 place, and have targets (defined >> >> further down in subdirectories) that require APK packaging to specify >> >> only the native target name that should be built & packaged. >> >> >> >> At the moment we specify the root CMakeLists.txt by walking up the >> >> tree, paths like "../../../../CMakeLists.txt". I think this should be >> >> put at the top-level build gradle file if possible. Is this doable at >> >> the moment? What is the recommended setup? >> >> >> >> On Mon, Aug 21, 2017 at 9:37 AM, Jom O'Fisher >> >> wrote: >> >> > Gradle does introspection on the CMake build to find .so targets and >> >> > those >> >> > get packaged. >> >> > There is also a special case for stl/runtime .so files from the NDK. >> >> > Any additional .so files need to specified in build.gradle using >> >> > jniDirs >> >> > >> >> > On Mon, Aug 21, 2017 at 7:30 AM, Robert Dailey >> >> > >> >> > wrote:
Re: [CMake] CMake + Gradle for Android
Would it work for your situation for the leaf CMakeLists.txt to include the root CMakeLists.txt? Then have the leaf-specific logic in the leaf CMakeLists.txt? On Mon, Aug 21, 2017 at 9:33 AM, Robert Daileywrote: > Basically, yes. We have this sort of structure: > > / > Applications/ > App1/ > build.gradle > CMakeLists.txt > App2/ > build.gradle > CMakeLists.txt > App3/ > build.gradle > CMakeLists.txt > CommonLib/ > build.gradle > CMakeLists.txt > CMakeLists.txt > > The libs are defined as follows: > > * CommonLib is a static library (java code builds into a library) > * No dependencies of its own > * App1 is a shared library (java code builds into a library) > * Dependencies (both java & native): CommonLib > * App2 is a shared library (java code builds into an APK) >* Dependencies (both java & native): App1, CommonLib > * App3 is a shared library (java code builds into an APK) >* Dependencies (both java & native): CommonLib > > In all cases, CMake must be invoked starting at the root > CMakeLists.txt 1 time. Each target can be built from the same binary > directory after that. Previously with ANT, I was building all native > targets first, then moved libs to appropriate directories so that the > 'ant' command would package the libs. > > For gradle, I wanted to avoid redundantly specifying the root > directory in each leaf-level project directory. Using the example > above, the leaf-level directories in this case would be App1, App2, > App3, and CommonLib. However I think we only specify the native CMake > stuff for the java targets that actually output an APK (that would be > App2 and App3 only). > > The ultimate goal is to specify stuff that doesn't change per > independent "module" of ours at the top level so it is transitive / > inherited. Then only specify the differences (e.g. the native CMake > target to build) in the leaf build gradle files. However you indicated > this isn't possible. > > > > On Mon, Aug 21, 2017 at 11:11 AM, Jom O'Fisher > wrote: > > What you're doing already sounds correct. You can't directly specify > > CMakeLists.txt from the top-level build.gradle. Recommendation is that it > > should be specified from the build.gradle of the module of the APK. Is > the > > issue that you have multiple APK modules that all reference the same > CMake > > libraries? > > > > On Mon, Aug 21, 2017 at 9:00 AM, Robert Dailey > > > wrote: > >> > >> Thanks this is very helpful. The other question I have is: Is there a > >> place to centrally specify the root CMakeLists.txt? Basically, I want > >> to specify the CMake root in 1 place, and have targets (defined > >> further down in subdirectories) that require APK packaging to specify > >> only the native target name that should be built & packaged. > >> > >> At the moment we specify the root CMakeLists.txt by walking up the > >> tree, paths like "../../../../CMakeLists.txt". I think this should be > >> put at the top-level build gradle file if possible. Is this doable at > >> the moment? What is the recommended setup? > >> > >> On Mon, Aug 21, 2017 at 9:37 AM, Jom O'Fisher > >> wrote: > >> > Gradle does introspection on the CMake build to find .so targets and > >> > those > >> > get packaged. > >> > There is also a special case for stl/runtime .so files from the NDK. > >> > Any additional .so files need to specified in build.gradle using > jniDirs > >> > > >> > On Mon, Aug 21, 2017 at 7:30 AM, Robert Dailey > >> > > >> > wrote: > >> >> > >> >> How exactly does Gradle package *.so files in an APK? I know that ANT > >> >> used to do this for any libs under "libs/". Does Gradle do some > >> >> introspection into CMake targets to see if outputs are *.so, and copy > >> >> those to some location if needed? What about libraries like > >> >> libgnustl_shared.so that come with the NDK? I'd like to know if any > >> >> manual copy steps are needed in CMake to put outputs in proper > >> >> locations for the APK build step. I had to do this when using ANT. > >> >> > >> >> On Mon, Aug 7, 2017 at 6:16 PM, Jom O'Fisher > >> >> wrote: > >> >> > 1) There is a folder created for each ABI under the project module > >> >> > folder > >> >> > (so unique per module per ABI) > >> >> > 2) Gradle doesn't specify language level though you can choose to > >> >> > specify it > >> >> > yourself from the build.gradle. This doc does a pretty good job of > >> >> > explaining which variables are set by Gradle: > >> >> > https://developer.android.com/ndk/guides/cmake.html#variables. > >> >> > Philosophically, we try to set as little as we can get away with. > In > >> >> > particular, the section titled "Understanding the CMake build > >> >> > command" > >> >> > lays > >> >> > out exactly what we
Re: [CMake] CMake + Gradle for Android
Basically, yes. We have this sort of structure: / Applications/ App1/ build.gradle CMakeLists.txt App2/ build.gradle CMakeLists.txt App3/ build.gradle CMakeLists.txt CommonLib/ build.gradle CMakeLists.txt CMakeLists.txt The libs are defined as follows: * CommonLib is a static library (java code builds into a library) * No dependencies of its own * App1 is a shared library (java code builds into a library) * Dependencies (both java & native): CommonLib * App2 is a shared library (java code builds into an APK) * Dependencies (both java & native): App1, CommonLib * App3 is a shared library (java code builds into an APK) * Dependencies (both java & native): CommonLib In all cases, CMake must be invoked starting at the root CMakeLists.txt 1 time. Each target can be built from the same binary directory after that. Previously with ANT, I was building all native targets first, then moved libs to appropriate directories so that the 'ant' command would package the libs. For gradle, I wanted to avoid redundantly specifying the root directory in each leaf-level project directory. Using the example above, the leaf-level directories in this case would be App1, App2, App3, and CommonLib. However I think we only specify the native CMake stuff for the java targets that actually output an APK (that would be App2 and App3 only). The ultimate goal is to specify stuff that doesn't change per independent "module" of ours at the top level so it is transitive / inherited. Then only specify the differences (e.g. the native CMake target to build) in the leaf build gradle files. However you indicated this isn't possible. On Mon, Aug 21, 2017 at 11:11 AM, Jom O'Fisherwrote: > What you're doing already sounds correct. You can't directly specify > CMakeLists.txt from the top-level build.gradle. Recommendation is that it > should be specified from the build.gradle of the module of the APK. Is the > issue that you have multiple APK modules that all reference the same CMake > libraries? > > On Mon, Aug 21, 2017 at 9:00 AM, Robert Dailey > wrote: >> >> Thanks this is very helpful. The other question I have is: Is there a >> place to centrally specify the root CMakeLists.txt? Basically, I want >> to specify the CMake root in 1 place, and have targets (defined >> further down in subdirectories) that require APK packaging to specify >> only the native target name that should be built & packaged. >> >> At the moment we specify the root CMakeLists.txt by walking up the >> tree, paths like "../../../../CMakeLists.txt". I think this should be >> put at the top-level build gradle file if possible. Is this doable at >> the moment? What is the recommended setup? >> >> On Mon, Aug 21, 2017 at 9:37 AM, Jom O'Fisher >> wrote: >> > Gradle does introspection on the CMake build to find .so targets and >> > those >> > get packaged. >> > There is also a special case for stl/runtime .so files from the NDK. >> > Any additional .so files need to specified in build.gradle using jniDirs >> > >> > On Mon, Aug 21, 2017 at 7:30 AM, Robert Dailey >> > >> > wrote: >> >> >> >> How exactly does Gradle package *.so files in an APK? I know that ANT >> >> used to do this for any libs under "libs/". Does Gradle do some >> >> introspection into CMake targets to see if outputs are *.so, and copy >> >> those to some location if needed? What about libraries like >> >> libgnustl_shared.so that come with the NDK? I'd like to know if any >> >> manual copy steps are needed in CMake to put outputs in proper >> >> locations for the APK build step. I had to do this when using ANT. >> >> >> >> On Mon, Aug 7, 2017 at 6:16 PM, Jom O'Fisher >> >> wrote: >> >> > 1) There is a folder created for each ABI under the project module >> >> > folder >> >> > (so unique per module per ABI) >> >> > 2) Gradle doesn't specify language level though you can choose to >> >> > specify it >> >> > yourself from the build.gradle. This doc does a pretty good job of >> >> > explaining which variables are set by Gradle: >> >> > https://developer.android.com/ndk/guides/cmake.html#variables. >> >> > Philosophically, we try to set as little as we can get away with. In >> >> > particular, the section titled "Understanding the CMake build >> >> > command" >> >> > lays >> >> > out exactly what we set. You can also see the folders we specify (one >> >> > per >> >> > module per ABI) >> >> > 3) Not sure I understand this. >> >> > >> >> > The other document worth taking a look at (if you haven't already) >> >> > is: >> >> > https://developer.android.com/studio/projects/add-native-code.html >> >> > >> >> > >> >> > On Mon, Aug 7, 2017 at 3:35 PM, Robert Dailey >> >> > >> >> > wrote: >> >> >> >> >> >> Thanks Jom >> >> >> >> >> >>
Re: [CMake] CMake + Gradle for Android
What you're doing already sounds correct. You can't directly specify CMakeLists.txt from the top-level build.gradle. Recommendation is that it should be specified from the build.gradle of the module of the APK. Is the issue that you have multiple APK modules that all reference the same CMake libraries? On Mon, Aug 21, 2017 at 9:00 AM, Robert Daileywrote: > Thanks this is very helpful. The other question I have is: Is there a > place to centrally specify the root CMakeLists.txt? Basically, I want > to specify the CMake root in 1 place, and have targets (defined > further down in subdirectories) that require APK packaging to specify > only the native target name that should be built & packaged. > > At the moment we specify the root CMakeLists.txt by walking up the > tree, paths like "../../../../CMakeLists.txt". I think this should be > put at the top-level build gradle file if possible. Is this doable at > the moment? What is the recommended setup? > > On Mon, Aug 21, 2017 at 9:37 AM, Jom O'Fisher > wrote: > > Gradle does introspection on the CMake build to find .so targets and > those > > get packaged. > > There is also a special case for stl/runtime .so files from the NDK. > > Any additional .so files need to specified in build.gradle using jniDirs > > > > On Mon, Aug 21, 2017 at 7:30 AM, Robert Dailey > > > wrote: > >> > >> How exactly does Gradle package *.so files in an APK? I know that ANT > >> used to do this for any libs under "libs/". Does Gradle do some > >> introspection into CMake targets to see if outputs are *.so, and copy > >> those to some location if needed? What about libraries like > >> libgnustl_shared.so that come with the NDK? I'd like to know if any > >> manual copy steps are needed in CMake to put outputs in proper > >> locations for the APK build step. I had to do this when using ANT. > >> > >> On Mon, Aug 7, 2017 at 6:16 PM, Jom O'Fisher > wrote: > >> > 1) There is a folder created for each ABI under the project module > >> > folder > >> > (so unique per module per ABI) > >> > 2) Gradle doesn't specify language level though you can choose to > >> > specify it > >> > yourself from the build.gradle. This doc does a pretty good job of > >> > explaining which variables are set by Gradle: > >> > https://developer.android.com/ndk/guides/cmake.html#variables. > >> > Philosophically, we try to set as little as we can get away with. In > >> > particular, the section titled "Understanding the CMake build command" > >> > lays > >> > out exactly what we set. You can also see the folders we specify (one > >> > per > >> > module per ABI) > >> > 3) Not sure I understand this. > >> > > >> > The other document worth taking a look at (if you haven't already) is: > >> > https://developer.android.com/studio/projects/add-native-code.html > >> > > >> > > >> > On Mon, Aug 7, 2017 at 3:35 PM, Robert Dailey < > rcdailey.li...@gmail.com> > >> > wrote: > >> >> > >> >> Thanks Jom > >> >> > >> >> Honestly, I prefer option 1 to work simply because that's how > Google's > >> >> officially supporting CMake. But it also has debugging which is the > #1 > >> >> reason for me. > >> >> > >> >> However, I'd like to understand a lot more about how the integration > >> >> really happens. For example, I have these questions: > >> >> > >> >> 1) How, internally, are CMake build directories managed? Do you > >> >> generate 1 per unique android project? What about for each specific > >> >> platform (x86, armeabi-v7a, etc)? > >> >> 2) Last time I looked into CMake integration, things defined inside > >> >> the CMake scripts were ignored because they are specified at the > >> >> command line. Namely, all of those settings that are driven by the > >> >> Gradle configuration (CXX language level was one in particular I > >> >> think; I specify C++14 support via CMake, but I recall this being > >> >> overridden from outside)? > >> >> 3) How redundant is it to configure individual libraries via the > >> >> gradle scripts? In my previous attempts, I wanted to define common > >> >> stuff for CMake / native code at the root gradle or settings file, > and > >> >> only define the differences in the actual gradle build files for each > >> >> corresponding Java target (like, defining the name of the native > >> >> (shared library) target in Gradle, but the command line invocation, > -D > >> >> CMake settings, etc would all be common and defined at the root). > >> >> > >> >> The TLDR is, the closer we can stay to CMake's way of doing things > and > >> >> keep CMake-related settings self-contained to the CMake scripts > >> >> themselves, the better. This also makes cross-platform easier (we > >> >> build the native code in Windows, for example, so having settings > >> >> specified in the gradle files do not carry over to other platforms. > >> >> Namely, settings that are not platform specific like the C++ language > >> >> level). > >> >>
Re: [CMake] CMake + Gradle for Android
Thanks this is very helpful. The other question I have is: Is there a place to centrally specify the root CMakeLists.txt? Basically, I want to specify the CMake root in 1 place, and have targets (defined further down in subdirectories) that require APK packaging to specify only the native target name that should be built & packaged. At the moment we specify the root CMakeLists.txt by walking up the tree, paths like "../../../../CMakeLists.txt". I think this should be put at the top-level build gradle file if possible. Is this doable at the moment? What is the recommended setup? On Mon, Aug 21, 2017 at 9:37 AM, Jom O'Fisherwrote: > Gradle does introspection on the CMake build to find .so targets and those > get packaged. > There is also a special case for stl/runtime .so files from the NDK. > Any additional .so files need to specified in build.gradle using jniDirs > > On Mon, Aug 21, 2017 at 7:30 AM, Robert Dailey > wrote: >> >> How exactly does Gradle package *.so files in an APK? I know that ANT >> used to do this for any libs under "libs/". Does Gradle do some >> introspection into CMake targets to see if outputs are *.so, and copy >> those to some location if needed? What about libraries like >> libgnustl_shared.so that come with the NDK? I'd like to know if any >> manual copy steps are needed in CMake to put outputs in proper >> locations for the APK build step. I had to do this when using ANT. >> >> On Mon, Aug 7, 2017 at 6:16 PM, Jom O'Fisher wrote: >> > 1) There is a folder created for each ABI under the project module >> > folder >> > (so unique per module per ABI) >> > 2) Gradle doesn't specify language level though you can choose to >> > specify it >> > yourself from the build.gradle. This doc does a pretty good job of >> > explaining which variables are set by Gradle: >> > https://developer.android.com/ndk/guides/cmake.html#variables. >> > Philosophically, we try to set as little as we can get away with. In >> > particular, the section titled "Understanding the CMake build command" >> > lays >> > out exactly what we set. You can also see the folders we specify (one >> > per >> > module per ABI) >> > 3) Not sure I understand this. >> > >> > The other document worth taking a look at (if you haven't already) is: >> > https://developer.android.com/studio/projects/add-native-code.html >> > >> > >> > On Mon, Aug 7, 2017 at 3:35 PM, Robert Dailey >> > wrote: >> >> >> >> Thanks Jom >> >> >> >> Honestly, I prefer option 1 to work simply because that's how Google's >> >> officially supporting CMake. But it also has debugging which is the #1 >> >> reason for me. >> >> >> >> However, I'd like to understand a lot more about how the integration >> >> really happens. For example, I have these questions: >> >> >> >> 1) How, internally, are CMake build directories managed? Do you >> >> generate 1 per unique android project? What about for each specific >> >> platform (x86, armeabi-v7a, etc)? >> >> 2) Last time I looked into CMake integration, things defined inside >> >> the CMake scripts were ignored because they are specified at the >> >> command line. Namely, all of those settings that are driven by the >> >> Gradle configuration (CXX language level was one in particular I >> >> think; I specify C++14 support via CMake, but I recall this being >> >> overridden from outside)? >> >> 3) How redundant is it to configure individual libraries via the >> >> gradle scripts? In my previous attempts, I wanted to define common >> >> stuff for CMake / native code at the root gradle or settings file, and >> >> only define the differences in the actual gradle build files for each >> >> corresponding Java target (like, defining the name of the native >> >> (shared library) target in Gradle, but the command line invocation, -D >> >> CMake settings, etc would all be common and defined at the root). >> >> >> >> The TLDR is, the closer we can stay to CMake's way of doing things and >> >> keep CMake-related settings self-contained to the CMake scripts >> >> themselves, the better. This also makes cross-platform easier (we >> >> build the native code in Windows, for example, so having settings >> >> specified in the gradle files do not carry over to other platforms. >> >> Namely, settings that are not platform specific like the C++ language >> >> level). >> >> >> >> If there's a detailed document / wiki I can read on the intrinsics of >> >> CMake integration in Gradle / Android Studio, I'd love to read it. >> >> Otherwise, I hope you won't mind if I pick your brain as questions >> >> come up. I think I'm going to try option 1 for now and see how it >> >> goes. It's just black box for me because unlike option 2, I have very >> >> little control over what happens after building the shared libraries, >> >> and to make up for that I need to really get a deep understanding of >> >> how it works so I can make sure I code my CMake
Re: [CMake] CMake + Gradle for Android
Gradle does introspection on the CMake build to find .so targets and those get packaged. There is also a special case for stl/runtime .so files from the NDK. Any additional .so files need to specified in build.gradle using jniDirs On Mon, Aug 21, 2017 at 7:30 AM, Robert Daileywrote: > How exactly does Gradle package *.so files in an APK? I know that ANT > used to do this for any libs under "libs/". Does Gradle do some > introspection into CMake targets to see if outputs are *.so, and copy > those to some location if needed? What about libraries like > libgnustl_shared.so that come with the NDK? I'd like to know if any > manual copy steps are needed in CMake to put outputs in proper > locations for the APK build step. I had to do this when using ANT. > > On Mon, Aug 7, 2017 at 6:16 PM, Jom O'Fisher wrote: > > 1) There is a folder created for each ABI under the project module folder > > (so unique per module per ABI) > > 2) Gradle doesn't specify language level though you can choose to > specify it > > yourself from the build.gradle. This doc does a pretty good job of > > explaining which variables are set by Gradle: > > https://developer.android.com/ndk/guides/cmake.html#variables. > > Philosophically, we try to set as little as we can get away with. In > > particular, the section titled "Understanding the CMake build command" > lays > > out exactly what we set. You can also see the folders we specify (one per > > module per ABI) > > 3) Not sure I understand this. > > > > The other document worth taking a look at (if you haven't already) is: > > https://developer.android.com/studio/projects/add-native-code.html > > > > > > On Mon, Aug 7, 2017 at 3:35 PM, Robert Dailey > > wrote: > >> > >> Thanks Jom > >> > >> Honestly, I prefer option 1 to work simply because that's how Google's > >> officially supporting CMake. But it also has debugging which is the #1 > >> reason for me. > >> > >> However, I'd like to understand a lot more about how the integration > >> really happens. For example, I have these questions: > >> > >> 1) How, internally, are CMake build directories managed? Do you > >> generate 1 per unique android project? What about for each specific > >> platform (x86, armeabi-v7a, etc)? > >> 2) Last time I looked into CMake integration, things defined inside > >> the CMake scripts were ignored because they are specified at the > >> command line. Namely, all of those settings that are driven by the > >> Gradle configuration (CXX language level was one in particular I > >> think; I specify C++14 support via CMake, but I recall this being > >> overridden from outside)? > >> 3) How redundant is it to configure individual libraries via the > >> gradle scripts? In my previous attempts, I wanted to define common > >> stuff for CMake / native code at the root gradle or settings file, and > >> only define the differences in the actual gradle build files for each > >> corresponding Java target (like, defining the name of the native > >> (shared library) target in Gradle, but the command line invocation, -D > >> CMake settings, etc would all be common and defined at the root). > >> > >> The TLDR is, the closer we can stay to CMake's way of doing things and > >> keep CMake-related settings self-contained to the CMake scripts > >> themselves, the better. This also makes cross-platform easier (we > >> build the native code in Windows, for example, so having settings > >> specified in the gradle files do not carry over to other platforms. > >> Namely, settings that are not platform specific like the C++ language > >> level). > >> > >> If there's a detailed document / wiki I can read on the intrinsics of > >> CMake integration in Gradle / Android Studio, I'd love to read it. > >> Otherwise, I hope you won't mind if I pick your brain as questions > >> come up. I think I'm going to try option 1 for now and see how it > >> goes. It's just black box for me because unlike option 2, I have very > >> little control over what happens after building the shared libraries, > >> and to make up for that I need to really get a deep understanding of > >> how it works so I can make sure I code my CMake scripts properly for > >> not only Android, but my other platforms as well (non-Android > >> platforms). > >> > >> Thanks again. > >> > >> On Mon, Aug 7, 2017 at 5:12 PM, Jom O'Fisher > wrote: > >> > Either option can work fine. Disclosure: I work on Android Studio and > >> > was > >> > the one that added CMake support. > >> > > >> > Option (1) is the way it's designed to work and we're working toward > >> > getting > >> > rid of the need for the CMake fork. I can't really say when that will > >> > happen > >> > but if you can get away with an older CMake for now then I'd go this > >> > way. > >> > As you mentioned, option (1) will allow you to view your source file > >> > structure in Android Studio, edit files, and debug using the
Re: [CMake] CMake + Gradle for Android
How exactly does Gradle package *.so files in an APK? I know that ANT used to do this for any libs under "libs/". Does Gradle do some introspection into CMake targets to see if outputs are *.so, and copy those to some location if needed? What about libraries like libgnustl_shared.so that come with the NDK? I'd like to know if any manual copy steps are needed in CMake to put outputs in proper locations for the APK build step. I had to do this when using ANT. On Mon, Aug 7, 2017 at 6:16 PM, Jom O'Fisherwrote: > 1) There is a folder created for each ABI under the project module folder > (so unique per module per ABI) > 2) Gradle doesn't specify language level though you can choose to specify it > yourself from the build.gradle. This doc does a pretty good job of > explaining which variables are set by Gradle: > https://developer.android.com/ndk/guides/cmake.html#variables. > Philosophically, we try to set as little as we can get away with. In > particular, the section titled "Understanding the CMake build command" lays > out exactly what we set. You can also see the folders we specify (one per > module per ABI) > 3) Not sure I understand this. > > The other document worth taking a look at (if you haven't already) is: > https://developer.android.com/studio/projects/add-native-code.html > > > On Mon, Aug 7, 2017 at 3:35 PM, Robert Dailey > wrote: >> >> Thanks Jom >> >> Honestly, I prefer option 1 to work simply because that's how Google's >> officially supporting CMake. But it also has debugging which is the #1 >> reason for me. >> >> However, I'd like to understand a lot more about how the integration >> really happens. For example, I have these questions: >> >> 1) How, internally, are CMake build directories managed? Do you >> generate 1 per unique android project? What about for each specific >> platform (x86, armeabi-v7a, etc)? >> 2) Last time I looked into CMake integration, things defined inside >> the CMake scripts were ignored because they are specified at the >> command line. Namely, all of those settings that are driven by the >> Gradle configuration (CXX language level was one in particular I >> think; I specify C++14 support via CMake, but I recall this being >> overridden from outside)? >> 3) How redundant is it to configure individual libraries via the >> gradle scripts? In my previous attempts, I wanted to define common >> stuff for CMake / native code at the root gradle or settings file, and >> only define the differences in the actual gradle build files for each >> corresponding Java target (like, defining the name of the native >> (shared library) target in Gradle, but the command line invocation, -D >> CMake settings, etc would all be common and defined at the root). >> >> The TLDR is, the closer we can stay to CMake's way of doing things and >> keep CMake-related settings self-contained to the CMake scripts >> themselves, the better. This also makes cross-platform easier (we >> build the native code in Windows, for example, so having settings >> specified in the gradle files do not carry over to other platforms. >> Namely, settings that are not platform specific like the C++ language >> level). >> >> If there's a detailed document / wiki I can read on the intrinsics of >> CMake integration in Gradle / Android Studio, I'd love to read it. >> Otherwise, I hope you won't mind if I pick your brain as questions >> come up. I think I'm going to try option 1 for now and see how it >> goes. It's just black box for me because unlike option 2, I have very >> little control over what happens after building the shared libraries, >> and to make up for that I need to really get a deep understanding of >> how it works so I can make sure I code my CMake scripts properly for >> not only Android, but my other platforms as well (non-Android >> platforms). >> >> Thanks again. >> >> On Mon, Aug 7, 2017 at 5:12 PM, Jom O'Fisher wrote: >> > Either option can work fine. Disclosure: I work on Android Studio and >> > was >> > the one that added CMake support. >> > >> > Option (1) is the way it's designed to work and we're working toward >> > getting >> > rid of the need for the CMake fork. I can't really say when that will >> > happen >> > but if you can get away with an older CMake for now then I'd go this >> > way. >> > As you mentioned, option (1) will allow you to view your source file >> > structure in Android Studio, edit files, and debug using the built-in >> > debugging support. >> > >> > To get option (2) to work, you can use jniDirs setting to tell Android >> > Gradle where to pick up your built .so files (see >> > >> > https://stackoverflow.com/questions/21255125/how-can-i-add-so-files-to-an-android-library-project-using-gradle-0-7). >> > I'm not aware of any projects that use this approach but it should work >> > in >> > principal. >> > >> > I hope this helps, >> > Jomo >> > >> > >> > On Mon, Aug 7, 2017 at 11:09 AM, Robert Dailey
Re: [CMake] CMake + Gradle for Android
On 8/8/17, Jom O'Fisherwrote: > Yeah, we'd like to support any CMake more recent than 3.7.0 (which is the > first version to support server mode). So your fork would need to be based > on a somewhat recent CMake. We probably wouldn't support a path directly in > build.gradle since that is typically a source controlled artifact. We'd let > you set a file path in local.properties and/or specify a CMake version > number in build.gradle where we'd search for it in some well-known > locations. I think I could live with local.properties. Any chance you could fast track this and get it in soon? Somewhat coincidentally, my fork of CMake happened close to the time of where the Google fork seemed to happen. I tried the merge. I got tons of conflicts for other things, not my changes. I'm about half-way resolving them...but my changeset is relatively small so I've been thinking I might just manually repatch on yours or try the cherry-picking feature of Git. Thanks, Eric -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] CMake + Gradle for Android
Yeah, we'd like to support any CMake more recent than 3.7.0 (which is the first version to support server mode). So your fork would need to be based on a somewhat recent CMake. We probably wouldn't support a path directly in build.gradle since that is typically a source controlled artifact. We'd let you set a file path in local.properties and/or specify a CMake version number in build.gradle where we'd search for it in some well-known locations. On Tue, Aug 8, 2017 at 5:21 PM, Eric Wingwrote: > Hi Jom, > > I'm glad to hear Android's CMake will eventually catch up. > > But since you are here, can you add a feature that allows a user to > specify an alternate location for where CMake is located? There are > two useful cases for this. > > 1) Users daring or desperate enough to try using a more recent CMake > while they wait (perhaps they could have merged with Google's branch > manually) > > 2) In my case, I'm trying to implement new features into CMake (Swift > compiler support). It's not going to be mainlined anytime soon since > it is a long project, so even when you catch up, I still need to be > able to call my fork of CMake. > > I don't want to overwrite anything in the Android distribution, and I > have people using my stuff and helping me, so we need a way to > collaborate. A simple gradle argument that lets me specify an > alternative path to CMake would fix my problem. (The other things I > need are specifying a toolchain file which I think you already support > and an Initial Cache (-C switch) which maybe is implicitly supported > since it is just a generic CMake command line argument. > > > Right now, I am doing the alternative method of calling CMake myself > through Gradle/Groovy scripts as people used to do. But I never > figured out how to get debugger integration with Android Studio as a > consequence. I would really like to move to the official Google/CMake > support, but I can't do that unless I can invoke a different CMake. (I > did pull the Google fork of CMake and I think my changes are > mergable.) > > Thanks, > Eric > -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] CMake + Gradle for Android
Hi Jom, I'm glad to hear Android's CMake will eventually catch up. But since you are here, can you add a feature that allows a user to specify an alternate location for where CMake is located? There are two useful cases for this. 1) Users daring or desperate enough to try using a more recent CMake while they wait (perhaps they could have merged with Google's branch manually) 2) In my case, I'm trying to implement new features into CMake (Swift compiler support). It's not going to be mainlined anytime soon since it is a long project, so even when you catch up, I still need to be able to call my fork of CMake. I don't want to overwrite anything in the Android distribution, and I have people using my stuff and helping me, so we need a way to collaborate. A simple gradle argument that lets me specify an alternative path to CMake would fix my problem. (The other things I need are specifying a toolchain file which I think you already support and an Initial Cache (-C switch) which maybe is implicitly supported since it is just a generic CMake command line argument. Right now, I am doing the alternative method of calling CMake myself through Gradle/Groovy scripts as people used to do. But I never figured out how to get debugger integration with Android Studio as a consequence. I would really like to move to the official Google/CMake support, but I can't do that unless I can invoke a different CMake. (I did pull the Google fork of CMake and I think my changes are mergable.) Thanks, Eric -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] CMake + Gradle for Android
1) There is a folder created for each ABI under the project module folder (so unique per module per ABI) 2) Gradle doesn't specify language level though you can choose to specify it yourself from the build.gradle. This doc does a pretty good job of explaining which variables are set by Gradle: https://developer.android.com/ndk/guides/cmake.html#variables. Philosophically, we try to set as little as we can get away with. In particular, the section titled "Understanding the CMake build command" lays out exactly what we set. You can also see the folders we specify (one per module per ABI) 3) Not sure I understand this. The other document worth taking a look at (if you haven't already) is: https://developer.android.com/studio/projects/add-native-code.html On Mon, Aug 7, 2017 at 3:35 PM, Robert Daileywrote: > Thanks Jom > > Honestly, I prefer option 1 to work simply because that's how Google's > officially supporting CMake. But it also has debugging which is the #1 > reason for me. > > However, I'd like to understand a lot more about how the integration > really happens. For example, I have these questions: > > 1) How, internally, are CMake build directories managed? Do you > generate 1 per unique android project? What about for each specific > platform (x86, armeabi-v7a, etc)? > 2) Last time I looked into CMake integration, things defined inside > the CMake scripts were ignored because they are specified at the > command line. Namely, all of those settings that are driven by the > Gradle configuration (CXX language level was one in particular I > think; I specify C++14 support via CMake, but I recall this being > overridden from outside)? > 3) How redundant is it to configure individual libraries via the > gradle scripts? In my previous attempts, I wanted to define common > stuff for CMake / native code at the root gradle or settings file, and > only define the differences in the actual gradle build files for each > corresponding Java target (like, defining the name of the native > (shared library) target in Gradle, but the command line invocation, -D > CMake settings, etc would all be common and defined at the root). > > The TLDR is, the closer we can stay to CMake's way of doing things and > keep CMake-related settings self-contained to the CMake scripts > themselves, the better. This also makes cross-platform easier (we > build the native code in Windows, for example, so having settings > specified in the gradle files do not carry over to other platforms. > Namely, settings that are not platform specific like the C++ language > level). > > If there's a detailed document / wiki I can read on the intrinsics of > CMake integration in Gradle / Android Studio, I'd love to read it. > Otherwise, I hope you won't mind if I pick your brain as questions > come up. I think I'm going to try option 1 for now and see how it > goes. It's just black box for me because unlike option 2, I have very > little control over what happens after building the shared libraries, > and to make up for that I need to really get a deep understanding of > how it works so I can make sure I code my CMake scripts properly for > not only Android, but my other platforms as well (non-Android > platforms). > > Thanks again. > > On Mon, Aug 7, 2017 at 5:12 PM, Jom O'Fisher wrote: > > Either option can work fine. Disclosure: I work on Android Studio and was > > the one that added CMake support. > > > > Option (1) is the way it's designed to work and we're working toward > getting > > rid of the need for the CMake fork. I can't really say when that will > happen > > but if you can get away with an older CMake for now then I'd go this way. > > As you mentioned, option (1) will allow you to view your source file > > structure in Android Studio, edit files, and debug using the built-in > > debugging support. > > > > To get option (2) to work, you can use jniDirs setting to tell Android > > Gradle where to pick up your built .so files (see > > https://stackoverflow.com/questions/21255125/how-can-i- > add-so-files-to-an-android-library-project-using-gradle-0-7). > > I'm not aware of any projects that use this approach but it should work > in > > principal. > > > > I hope this helps, > > Jomo > > > > > > On Mon, Aug 7, 2017 at 11:09 AM, Robert Dailey > > > wrote: > >> > >> Right now I have custom targets set to execute the "ant release" > >> command after my native targets are built. Part of that command > >> involves copying *.so files to the libs/armeabi-v7a directory so they > >> get packaged in an APK. > >> > >> When switching to gradle, I have two options: > >> > >> 1. Gradle drives CMake: This means using Android Studio and being > >> locked down to Google's fork of CMake which is a few major releases > >> behind. I see that as a negative. > >> > >> 2. CMake drives Gradle: This would be the same or similar to what I'm > >> already doing: The custom targets I have
Re: [CMake] CMake + Gradle for Android
Thanks Jom Honestly, I prefer option 1 to work simply because that's how Google's officially supporting CMake. But it also has debugging which is the #1 reason for me. However, I'd like to understand a lot more about how the integration really happens. For example, I have these questions: 1) How, internally, are CMake build directories managed? Do you generate 1 per unique android project? What about for each specific platform (x86, armeabi-v7a, etc)? 2) Last time I looked into CMake integration, things defined inside the CMake scripts were ignored because they are specified at the command line. Namely, all of those settings that are driven by the Gradle configuration (CXX language level was one in particular I think; I specify C++14 support via CMake, but I recall this being overridden from outside)? 3) How redundant is it to configure individual libraries via the gradle scripts? In my previous attempts, I wanted to define common stuff for CMake / native code at the root gradle or settings file, and only define the differences in the actual gradle build files for each corresponding Java target (like, defining the name of the native (shared library) target in Gradle, but the command line invocation, -D CMake settings, etc would all be common and defined at the root). The TLDR is, the closer we can stay to CMake's way of doing things and keep CMake-related settings self-contained to the CMake scripts themselves, the better. This also makes cross-platform easier (we build the native code in Windows, for example, so having settings specified in the gradle files do not carry over to other platforms. Namely, settings that are not platform specific like the C++ language level). If there's a detailed document / wiki I can read on the intrinsics of CMake integration in Gradle / Android Studio, I'd love to read it. Otherwise, I hope you won't mind if I pick your brain as questions come up. I think I'm going to try option 1 for now and see how it goes. It's just black box for me because unlike option 2, I have very little control over what happens after building the shared libraries, and to make up for that I need to really get a deep understanding of how it works so I can make sure I code my CMake scripts properly for not only Android, but my other platforms as well (non-Android platforms). Thanks again. On Mon, Aug 7, 2017 at 5:12 PM, Jom O'Fisherwrote: > Either option can work fine. Disclosure: I work on Android Studio and was > the one that added CMake support. > > Option (1) is the way it's designed to work and we're working toward getting > rid of the need for the CMake fork. I can't really say when that will happen > but if you can get away with an older CMake for now then I'd go this way. > As you mentioned, option (1) will allow you to view your source file > structure in Android Studio, edit files, and debug using the built-in > debugging support. > > To get option (2) to work, you can use jniDirs setting to tell Android > Gradle where to pick up your built .so files (see > https://stackoverflow.com/questions/21255125/how-can-i-add-so-files-to-an-android-library-project-using-gradle-0-7). > I'm not aware of any projects that use this approach but it should work in > principal. > > I hope this helps, > Jomo > > > On Mon, Aug 7, 2017 at 11:09 AM, Robert Dailey > wrote: >> >> Right now I have custom targets set to execute the "ant release" >> command after my native targets are built. Part of that command >> involves copying *.so files to the libs/armeabi-v7a directory so they >> get packaged in an APK. >> >> When switching to gradle, I have two options: >> >> 1. Gradle drives CMake: This means using Android Studio and being >> locked down to Google's fork of CMake which is a few major releases >> behind. I see that as a negative. >> >> 2. CMake drives Gradle: This would be the same or similar to what I'm >> already doing: The custom targets I have would execute gradle as a >> separate build step, instead of running ant commands. I'm not too >> familiar with Gradle, so I'm not sure how you tell it where your >> shared libraries are for the APK packaging steps. >> >> Which does everyone recommend? Is anyone using one of these setups >> successfully? The downside to option 2 is probably no on-device native >> debugging since Android Studio probably can't handle gradle projects >> without any external CMake builds set up. >> >> Would like some general direction & advice before I move away from >> ANT. Thanks in advance. >> -- >> >> Powered by www.kitware.com >> >> Please keep messages on-topic and check the CMake FAQ at: >> http://www.cmake.org/Wiki/CMake_FAQ >> >> Kitware offers various services to support the CMake community. For more >> information on each offering, please visit: >> >> CMake Support: http://cmake.org/cmake/help/support.html >> CMake Consulting: http://cmake.org/cmake/help/consulting.html >> CMake Training Courses:
Re: [CMake] CMake + Gradle for Android
Either option can work fine. Disclosure: I work on Android Studio and was the one that added CMake support. Option (1) is the way it's designed to work and we're working toward getting rid of the need for the CMake fork. I can't really say when that will happen but if you can get away with an older CMake for now then I'd go this way. As you mentioned, option (1) will allow you to view your source file structure in Android Studio, edit files, and debug using the built-in debugging support. To get option (2) to work, you can use jniDirs setting to tell Android Gradle where to pick up your built .so files (see https://stackoverflow.com/questions/21255125/how-can-i-add-so-files-to-an-android-library-project-using-gradle-0-7). I'm not aware of any projects that use this approach but it should work in principal. I hope this helps, Jomo On Mon, Aug 7, 2017 at 11:09 AM, Robert Daileywrote: > Right now I have custom targets set to execute the "ant release" > command after my native targets are built. Part of that command > involves copying *.so files to the libs/armeabi-v7a directory so they > get packaged in an APK. > > When switching to gradle, I have two options: > > 1. Gradle drives CMake: This means using Android Studio and being > locked down to Google's fork of CMake which is a few major releases > behind. I see that as a negative. > > 2. CMake drives Gradle: This would be the same or similar to what I'm > already doing: The custom targets I have would execute gradle as a > separate build step, instead of running ant commands. I'm not too > familiar with Gradle, so I'm not sure how you tell it where your > shared libraries are for the APK packaging steps. > > Which does everyone recommend? Is anyone using one of these setups > successfully? The downside to option 2 is probably no on-device native > debugging since Android Studio probably can't handle gradle projects > without any external CMake builds set up. > > Would like some general direction & advice before I move away from > ANT. Thanks in advance. > -- > > Powered by www.kitware.com > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Kitware offers various services to support the CMake community. For more > information on each offering, please visit: > > CMake Support: http://cmake.org/cmake/help/support.html > CMake Consulting: http://cmake.org/cmake/help/consulting.html > CMake Training Courses: http://cmake.org/cmake/help/training.html > > Visit other Kitware open-source projects at http://www.kitware.com/ > opensource/opensource.html > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/cmake > -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake