[CMake] -rdynamic causing problems for compiler checks

[Magnus Therning]

Oups, this was due to my own ignorance.  I really shouldn't set
CMAKE_SYSTEM_NAME to "Linux" when cross-compiling for an ARM system
with an RTOS :)  Sorry for the noise.

/M

On Tue, Mar 19, 2013 at 10:44 AM, Magnus Therning <magnus at therning.org> wrote:
> I'm using CMake (2.8.10.2) in an embedded project, which so far has
> worked great.  However, now I'm trying out a newer version of the
> compiler and I'm running into issues with '-rdynamic' when CMake
> checks the compiler.  The issue I see is this:
>
> ~~~~
> -- Check for working C compiler:
> /opt/rt-tools/compilers/arm-eabi/bin/arm-eabi-gcc -- broken
> CMake Error at /usr/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:61
> (message):
>   The C compiler "/opt/rt-tools/compilers/arm-eabi/bin/arm-eabi-gcc" is not
>   able to compile a simple test program.
>
>   It fails with the following output:
>
>    Change Dir: /home/semth/HBwork/floydi/floyd-build/floyd-ninja/CMakeFiles/CMakeTmp
>
>
>
>   Run Build Command:/usr/bin/make "cmTryCompileExec1091315603/fast"
>
>   /usr/bin/make -f CMakeFiles/cmTryCompileExec1091315603.dir/build.make
>   CMakeFiles/cmTryCompileExec1091315603.dir/build
>
>   make[1]: Entering directory
>   `/home/semth/HBwork/floydi/floyd-build/floyd-ninja/CMakeFiles/CMakeTmp'
>
>   /usr/bin/cmake -E cmake_progress_report
>   /home/semth/HBwork/floydi/floyd-build/floyd-ninja/CMakeFiles/CMakeTmp/CMakeFiles
>   1
>
>   Building C object
>   CMakeFiles/cmTryCompileExec1091315603.dir/testCCompiler.c.o
>
>   /opt/rt-tools/compilers/arm-eabi/bin/arm-eabi-gcc -o
>   CMakeFiles/cmTryCompileExec1091315603.dir/testCCompiler.c.o -c
>   /home/semth/HBwork/floydi/floyd-build/floyd-ninja/CMakeFiles/CMakeTmp/testCCompiler.c
>
>
>   Linking C executable cmTryCompileExec1091315603
>
>   /usr/bin/cmake -E cmake_link_script
>   CMakeFiles/cmTryCompileExec1091315603.dir/link.txt --verbose=1
>
>   /opt/rt-tools/compilers/arm-eabi/bin/arm-eabi-gcc
>   CMakeFiles/cmTryCompileExec1091315603.dir/testCCompiler.c.o -o
>   cmTryCompileExec1091315603 -rdynamic
>
>   arm-eabi-gcc: error: unrecognized option '-rdynamic'
> ~~~~
>
> I have the following lines in my tool chain file:
>
> ~~~~
> set( CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "" )
> set( CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "" )
> ~~~~
>
> which does remove the '-rdynamic' argument when compiling the
> *project*, however they don't seem remove the flag on the *compiler
> check*.  I found an old issue that seems related,
> http://www.cmake.org/Bug/view.php?id=9985, it's been closed for years.
>
> Is there some way to remove the flag on compiler checks, or is my only
> option to disable compiler checks alltogether?
>
> /M
>
> --
> Magnus Therning                      OpenPGP: 0xAB4DFBA4
> email: magnus at therning.org   jabber: magnus at therning.org
> twitter: magthe               http://therning.org/magnus



-- 
Magnus Therning                      OpenPGP: 0xAB4DFBA4
email: magnus at therning.org   jabber: magnus at therning.org
twitter: magthe               http://therning.org/magnus