[CMake] Suppressing -rdynamic in toolchain file
Hi I'm trying to use -ffunction-sections -fdata-sections as C_FLAGS and -Wl,--gc- sections when cross-compiling for my ARM Linux target. The gc-sections option does not work because CMake adds the -rdynamic flag which exports all symbols, also the unused ones. I already figured out that I can suppress this be setting set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS ) This work is the CMakeLists.txt files, but it does not work from a toolchain file. But I want to configure this in my toolchain file, because this setting is specific for this single target. It is not an option add this as generic setting for all targets. I also tried this: set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS CACHE INTERNAL FORCE) But this does not work either. I believe this is a problem of the order how CMake files are processed. It looks like the toolchain file is processed first and then /usr/share/cmake/Modules/Platform/Linux-GNU.cmake which overwrites the toolchain settings (just a guess) BTW: I had similar problems with settings CMAKE_C_FLAGS, etc. from the toochain file. # this does not work SET(CMAKE_C_FLAGS -Wall -Wextra -std=gnu99 -fdata-sections -ffunction- sections) # with CACHE FORCE it does work SET(CMAKE_C_FLAGS -Wall -Wextra -std=gnu99 -fdata-sections -ffunction- sections CACHE INTERNAL c compiler flags FORCE) I'm not sure if this was intended. And for CMAKE_SHARED_LIBRARY_LINK_C_FLAGS this does not work either, as explained above. I hope somebody can clarify how this options can be configured properly the CMake way. PS: I'm using cmake version 2.8.12.2 -- mit freundlichen Grüßen / best regards Gerhard Gappmeier ascolab GmbH - automation systems communication laboratory Tel.: +49 9131 691 123 Fax: +49 9131 691 128 Web: http://www.ascolab.com GPG-KeyId: 5AAC50C4 GPG-Fingerprint: 967A 15F1 2788 164D CCA3 6C46 07CD 6F82 5AAC 50C4 -- ascolab GmbH Geschäftsführer: Gerhard Gappmeier, Matthias Damm, Uwe Steinkrauß Sitz der Gesellschaft: Am Weichselgarten 7 • 91058 Erlangen • Germany Registernummer: HRB 9360 Registergericht: Amtsgericht Fürth signature.asc Description: This is a digitally signed message part. -- 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://www.cmake.org/mailman/listinfo/cmake
[CMake] Suppressing -rdynamic
I'm compiling under Linux and it seems like cmake is automatically adding -rdynamic to my build. This switch is okay for debug builds and open source tools, but for closed source it is a big problem. This switch is unfortunately exposing some unwanted functions in my code, like the licensing functions. This makes the functions easily available by using objdump -T or nm -D, even if the executable has been stripped. Is there a way to suppress the use of this switch? -- Gonzalo Garramuño [EMAIL PROTECTED] AMD4400 - ASUS48N-E GeForce7300GT Kubuntu Edgy ___ CMake mailing list CMake@cmake.org http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] Suppressing -rdynamic
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Дана субота 06 октобар 2007, Gonzalo Garramuño је написао(ла): I'm compiling under Linux and it seems like cmake is automatically adding -rdynamic to my build. This switch is okay for debug builds and open source tools, but for closed source it is a big problem. This switch is unfortunately exposing some unwanted functions in my code, like the licensing functions. This makes the functions easily available by using objdump -T or nm -D, even if the executable has been stripped. Is there a way to suppress the use of this switch? Hi, If you do a: [EMAIL PROTECTED] ~]$ cd /usr/share/cmake/Modules [EMAIL PROTECTED] Modules]$ grep 'rdynamic' * [EMAIL PROTECTED] Modules]$ grep 'rdynamic' */* Platform/kFreeBSD.cmake:SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS -rdynamic) Platform/Linux.cmake:SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS -rdynamic) Therefore, you have to override CMAKE_SHARED_LIBRARY_LINK_C_FLAGS and set it to blank. Something like: SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS ) or something like that. And do consider making your program free software ;) Best regards Filip - -- Filip Brcic [EMAIL PROTECTED] WWWeb: http://purl.org/NET/brcha/home/ Jabber: [EMAIL PROTECTED] ICQ# 40994923 Yahoo! brcha MSN: [EMAIL PROTECTED] -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) iD8DBQFHB3yReugpoxYs6H8RAki+AKCtU8j2w5QDp5pLOvQwNhyCvfNTowCgnr4R HWboVDawlQ/yqDMTGatbtro= =kC2K -END PGP SIGNATURE- ___ CMake mailing list CMake@cmake.org http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] Suppressing -rdynamic
Therefore, you have to override CMAKE_SHARED_LIBRARY_LINK_C_FLAGS and set it to blank. Something like: SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS ) or something like that. Did you actually try it? Suppressing the variable does nothing. Even replacing Linux.cmake with my own does nothing. -- Gonzalo Garramuño [EMAIL PROTECTED] AMD4400 - ASUS48N-E GeForce7300GT Kubuntu Edgy ___ CMake mailing list CMake@cmake.org http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] Suppressing -rdynamic
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Дана субота 06 октобар 2007, Gonzalo Garramuño је написао(ла): Therefore, you have to override CMAKE_SHARED_LIBRARY_LINK_C_FLAGS and set it to blank. Something like: SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS ) or something like that. Did you actually try it? Suppressing the variable does nothing. Even replacing Linux.cmake with my own does nothing. It works for me. Take a look at the attacked program. Here is my version of CMake: [EMAIL PROTECTED] ~]$ rpm -q cmake cmake-2.4.6-4.fc7 and here is the output of the verbose build: [EMAIL PROTECTED] build]$ make VERBOSE=1 /usr/bin/cmake -H/Users/brcha/tmp/helloWorld -B/Users/brcha/tmp/helloWorld/build --check-build-system CMakeFiles/Makefile.cmake 0 Clearing dependencies in CMakeFiles/helloWorld.dir/depend.make. Clearing dependencies in CMakeFiles/helloWorld.dir/depend.internal. /usr/bin/cmake -E cmake_progress_start /Users/brcha/tmp/helloWorld/build/CMakeFiles 1 make -f CMakeFiles/Makefile2 all make[1]: Entering directory `/Users/brcha/tmp/helloWorld/build' make -f CMakeFiles/helloWorld.dir/build.make CMakeFiles/helloWorld.dir/depend make[2]: Entering directory `/Users/brcha/tmp/helloWorld/build' Scanning dependencies of target helloWorld cd /Users/brcha/tmp/helloWorld/build /usr/bin/cmake -E cmake_depends Unix Makefiles /Users/brcha/tmp/helloWorld /Users/brcha/tmp/helloWorld /Users/brcha/tmp/helloWorld/build /Users/brcha/tmp/helloWorld/build /Users/brcha/tmp/helloWorld/build/CMakeFiles/helloWorld.dir/DependInfo.cmake make[2]: Leaving directory `/Users/brcha/tmp/helloWorld/build' make -f CMakeFiles/helloWorld.dir/build.make CMakeFiles/helloWorld.dir/build make[2]: Entering directory `/Users/brcha/tmp/helloWorld/build' /usr/bin/cmake -E cmake_progress_report /Users/brcha/tmp/helloWorld/build/CMakeFiles 1 [100%] Building C object CMakeFiles/helloWorld.dir/helloWorld.o /usr/lib64/ccache/gcc -o CMakeFiles/helloWorld.dir/helloWorld.o -c /Users/brcha/tmp/helloWorld/helloWorld.c Linking C executable helloWorld /usr/bin/cmake -P CMakeFiles/helloWorld.dir/cmake_clean_target.cmake /usr/lib64/ccache/gcc -fPIC CMakeFiles/helloWorld.dir/helloWorld.o -o helloWorld make[2]: Leaving directory `/Users/brcha/tmp/helloWorld/build' /usr/bin/cmake -E cmake_progress_report /Users/brcha/tmp/helloWorld/build/CMakeFiles 1 [100%] Built target helloWorld make[1]: Leaving directory `/Users/brcha/tmp/helloWorld/build' /usr/bin/cmake -E cmake_progress_start /Users/brcha/tmp/helloWorld/build/CMakeFiles 0 - -- Filip Brcic [EMAIL PROTECTED] WWWeb: http://purl.org/NET/brcha/home/ Jabber: [EMAIL PROTECTED] ICQ# 40994923 Yahoo! brcha MSN: [EMAIL PROTECTED] -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) iD8DBQFHB6JHeugpoxYs6H8RAmmfAJ9txffofxr6P2JDZo0BAgdVKZu6oQCgkMKo tFUi7uJt6A/qTPh/AaY5NQY= =qIJ2 -END PGP SIGNATURE- helloWorld.tar.bz2 Description: application/tbz ___ CMake mailing list CMake@cmake.org http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] Suppressing -rdynamic
Filip Brcic wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Дана субота 06 октобар 2007, Gonzalo Garramuño је написао(ла): Therefore, you have to override CMAKE_SHARED_LIBRARY_LINK_C_FLAGS and set it to blank. Something like: SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS ) CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS seems to be the key for c++. Have not been able to guess where that is set thou. -- Gonzalo Garramuño [EMAIL PROTECTED] AMD4400 - ASUS48N-E GeForce7300GT Kubuntu Edgy ___ CMake mailing list CMake@cmake.org http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] Suppressing -rdynamic
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Дана субота 06 октобар 2007, Gonzalo Garramuño је написао(ла):
Filip Brcic wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Дана субота 06 октобар 2007, Gonzalo Garramuño је написао(ла):
Therefore, you have to override CMAKE_SHARED_LIBRARY_LINK_C_FLAGS and
set it to blank. Something like:
SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS )
CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS seems to be the key for c++. Have
not been able to guess where that is set thou.
Yes, you are right. I made a new advanced version of my helloWorld++ (tm)
program using C++ (and cout for output) and it did include -rdynamic when
linking. But, after I added set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS ) the
problem dissapeared. Nice catch :)
And, here is where that is comming from:
[EMAIL PROTECTED] Modules]$ grep CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS *
CMakeCXXInformation.cmake:IF(NOT CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS)
CMakeCXXInformation.cmake: SET(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS
${CMAKE_SHARED_LIBRARY_LINK_C_FLAGS})
CMakeCXXInformation.cmake:ENDIF(NOT CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS)
Since that is evaluated in enable_language(CXX) (I guess), it uses the system
CMAKE_SHARED_LIBRARY_LINK_C_FLAGS variable and not the CMakeFiles.txt
version. For Fortran you should override
CMAKE_SHARED_LIBRARY_LINK_Fortran_FLAGS in the same way.
- --
Filip Brcic [EMAIL PROTECTED]
WWWeb: http://purl.org/NET/brcha/home/
Jabber: [EMAIL PROTECTED]
ICQ# 40994923
Yahoo! brcha
MSN: [EMAIL PROTECTED]
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Version: GnuPG v1.4.7 (GNU/Linux)
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