Re: Setting up toolchains
Am 27.09.2021 um 13:27 schrieb Anthony Webber: Anyway, I am trying to set up my gcc toolchains in Cygwin, by which I mean that I'm trying to set up the environment so that the right programs are called at the right time by build systems like cmake and waf, or if I want to build in a more manual fashion. Particularly, I want to be able to switch between toolchains easily. That's hardly ever a question of "setting up" the toolchains. It's rather a question of a) which build system those programs you're trying to build uses, and b) how you initialize/use said build systems. GNU autoconf and cmake have relatively mature mechanisms for doing this. For autoconf you just pass --host=... to configure, and that takes care of everything (assuming the package is capable of cross-building in the first place). For cmake you can preload a cmake script like this: cmake -C some/where/preload_mingw.cmake ../../path/to/source where preload_mingw.cmake might look like this: set(CMAKE_CXX_COMPILER "/usr/bin/x86_64-w64-mingw32-g++" CACHE FILEPATH "CXX compiler") set(CMAKE_C_COMPILER "/usr/bin/x86_64-w64-mingw32-gcc" CACHE FILEPATH "C compiler") set(CMAKE_CXX_FLAGS "-D_WIN32_WINNT=0x0601" CACHE STRING "") set(CMAKE_C_FLAGS "-D_WIN32_WINNT=0x0601" CACHE STRING "") set(WIN32 "1" CACHE STRING "") The benefit of doing it this way is that the preload script can stay the same for quite a lot of packages, and the system default compiler does not even enter the picture, so there will be no misled tests. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation:https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
Re: Setting up toolchains
On 2021-09-27 08:27, Lee via Cygwin wrote: On 9/27/21, Anthony Webber wrote: Please excuse the naivety of this question, but I've looked elsewhere and can't find a good answer. Perhaps a good answer is to install MSYS2 alongside Cygwin. that seems to be the usual answer here :( Anyway, I am trying to set up my gcc toolchains in Cygwin, by which I mean that I'm trying to set up the environment so that the right programs are called at the right time by build systems like cmake and waf, cmake supposedly supports cross-compilation. I've never figured out how to do it :( or if I want to build in a more manual fashion. Particularly, I want to be able to switch between toolchains easily. GNU autoconf. Switching between toolchains is as easy as autoconf autoheader ./configure --host=i686-w64-mingw32 I have installed both the x86_64-pc-cygwin-gcc/g++ and x86_64-w64-mingw32-gcc/g++ packages using setup-x86_64.exe. The first thing I notice is that the gcc/g++ programs in /bin are identical to x86_64-pc-cygwin-gcc/g++, and that symbolic links aren't being used. I presume it's being done this way because this is considered the default, native Cygwin toolchain, and that there should be be relatively little to do in the way of configuration if I want to build Cygwin software. If I do want to cross-compile using x86_64-w64-mingw32-gcc/g++, then I imagine that the very least I should do is set a bunch of environment variables like CC and CXX (perhaps by sourcing a shell script), but really I'd like some advice here. What do you guys do? I've never written anything that needed a make file; I just use the correct compiler. eg $ tail -3 getenv.c } /* i686-w64-mingw32-gcc -o getenv.exe getenv.c */ The only time I've had to use environment variables was for building mbedtls: export WINDOWS_BUILD=1 # build for a Windows platform export SHARED=1 # want the shared libraries created export CC=i686-w64-mingw32-gcc export LD=i686-w64-mingw32-gcc export CFLAGS="-O2 -fstack-protector-strong -D_FORTIFY_SOURCE=2" export LDFLAGS="${LDFLAGS} -fstack-protector-strong" make lib # build the libraries PATH="${PWD}/library:/usr/i686-w64-mingw32/sys-root/mingw/bin:${PATH}" # so the tests are able to find the mbedtls and mingw libraries make check # run the test suite Install cygport and learn the concepts from the html docs, about helper "cygclasses" which DTRT with definitions or provide them for you, functions, which you may override with your own shell functions, and examples available under: https://cygwin.com/git-cygwin-packages/ which contains over a decade of cygport build control shell script definitions, patches, and the minimum of everything needed to build many of the latest Cygwin packages. That includes cross-builds of cygwin32-, cygwin64-, mingw64-i686-, and mingw64-x86_64- versions packages. Beware of the playground branches used to try out CI builds of test and prerelease versions which may not configure, build, run, or pass any tests. You can also download the complete source packages which include the cygport and other build artifacts. You will always have to install various ...-devel and lib...-devel packages required to build libraries and programs. Recently updated cygport script definitions include DEPEND now BUILD_REQUIRES which define all packages required for building which have to be installed before running cygport, and by CI jobs at the start of CI cygport builds. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. [Data in binary units and prefixes, physical quantities in SI.] -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation:https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
Re: Setting up toolchains
On 9/27/21, Anthony Webber wrote: > Please excuse the naivety of this question, but I've looked elsewhere > and can't find a good answer. Perhaps a good answer is to install MSYS2 > alongside Cygwin. that seems to be the usual answer here :( > Anyway, I am trying to set up my gcc toolchains in Cygwin, by which I > mean that I'm trying to set up the environment so that the right > programs are called at the right time by build systems like cmake and > waf, cmake supposedly supports cross-compilation. I've never figured out how to do it :( > or if I want to build in a more manual fashion. Particularly, I > want to be able to switch between toolchains easily. GNU autoconf. Switching between toolchains is as easy as autoconf autoheader ./configure --host=i686-w64-mingw32 > I have installed both the x86_64-pc-cygwin-gcc/g++ and > x86_64-w64-mingw32-gcc/g++ packages using setup-x86_64.exe. > > The first thing I notice is that the gcc/g++ programs in /bin are > identical to x86_64-pc-cygwin-gcc/g++, and that symbolic links aren't > being used. I presume it's being done this way because this is > considered the default, native Cygwin toolchain, and that there should > be be relatively little to do in the way of configuration if I want to > build Cygwin software. > > If I do want to cross-compile using x86_64-w64-mingw32-gcc/g++, then I > imagine that the very least I should do is set a bunch of environment > variables like CC and CXX (perhaps by sourcing a shell script), but > really I'd like some advice here. What do you guys do? I've never written anything that needed a make file; I just use the correct compiler. eg $ tail -3 getenv.c } /* i686-w64-mingw32-gcc -o getenv.exe getenv.c */ The only time I've had to use environment variables was for building mbedtls: export WINDOWS_BUILD=1 # build for a Windows platform export SHARED=1 # want the shared libraries created export CC=i686-w64-mingw32-gcc export LD=i686-w64-mingw32-gcc export CFLAGS="-O2 -fstack-protector-strong -D_FORTIFY_SOURCE=2" export LDFLAGS="${LDFLAGS} -fstack-protector-strong" make lib # build the libraries PATH="${PWD}/library:/usr/i686-w64-mingw32/sys-root/mingw/bin:${PATH}" # so the tests are able to find the mbedtls and mingw libraries make check # run the test suite Regards, Lee -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation:https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
Setting up toolchains
Please excuse the naivety of this question, but I've looked elsewhere and can't find a good answer. Perhaps a good answer is to install MSYS2 alongside Cygwin. Anyway, I am trying to set up my gcc toolchains in Cygwin, by which I mean that I'm trying to set up the environment so that the right programs are called at the right time by build systems like cmake and waf, or if I want to build in a more manual fashion. Particularly, I want to be able to switch between toolchains easily. I have installed both the x86_64-pc-cygwin-gcc/g++ and x86_64-w64-mingw32-gcc/g++ packages using setup-x86_64.exe. The first thing I notice is that the gcc/g++ programs in /bin are identical to x86_64-pc-cygwin-gcc/g++, and that symbolic links aren't being used. I presume it's being done this way because this is considered the default, native Cygwin toolchain, and that there should be be relatively little to do in the way of configuration if I want to build Cygwin software. If I do want to cross-compile using x86_64-w64-mingw32-gcc/g++, then I imagine that the very least I should do is set a bunch of environment variables like CC and CXX (perhaps by sourcing a shell script), but really I'd like some advice here. What do you guys do? -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation:https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple