[CMake] CMake compiler check failure

[Bill Hoffman]

On 5/28/2010 7:07 PM, Zhenyao Mo wrote:
> I got the following errors when CMake tests my compilers.  The problem
> is that it seems CMake is checking /usr/bin/gcc, instead of the
> /usr/bin/armv7a-cros-linux-gnueabi-gcc it should have checked.
>
> I manually tried /usr/bin/armv7a-cros-linux-gnueabi-gcc, and it compiles
> fine, and manually tried /usr/bin/gcc, it failed with the same errors as
> below.
>
> So why CMake identified the correct compiler
> (armv7a-cros-linux-gnueabi-gcc), but when it checked the compiler (gcc),
> it used the wrong one?
>
> Thanks in advance for any help.
>
> - Mo
>
> ---------------------------------------------------------------------------------------------------------
> below is the error messages.
> ---------------------------------------------------------------------------------------------------------
>
> -- The C compiler identification is unknown
> -- The CXX compiler identification is unknown
> -- Check for working C compiler: /usr/bin/armv7a-cros-linux-gnueabi-gcc
> -- Check for working C compiler: /usr/bin/armv7a-cros-linux-gnueabi-gcc
> -- broken
> CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:32
> (MESSAGE):
>    The C compiler "/usr/bin/armv7a-cros-linux-gnueabi-gcc" is not able to
>    compile a simple test program.
>
>    It fails with the following output:
>
>     Change Dir:
> /build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp
>
>
>
>    Run Build Command:/usr/bin/gmake "cmTryCompileExec/fast"
>
>    /usr/bin/gmake -f CMakeFiles/cmTryCompileExec.dir/build.make
>    CMakeFiles/cmTryCompileExec.dir/build
>
>    gmake[1]: Entering directory
>
> `/build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp'
>
>
>    /usr/bin/cmake -E cmake_progress_report
>
> /build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp/CMakeFiles
>    1
>
>    Building C object CMakeFiles/cmTryCompileExec.dir/testCCompiler.c.o
>
>    /usr/bin/gcc -O2 -pipe -march=armv7-a -mtune=cortex-a8 -mfpu=neon
>    -mfloat-abi=softfp -I/build/arm-generic/usr/include/
>    -I/build/arm-generic/include/ -o
>    CMakeFiles/cmTryCompileExec.dir/testCCompiler.c.o -c
>
> /build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp/testCCompiler.c
>

Try removing the whole build tree, it may have some left over stuff from 
a wrong selection of the compiler at some point.

-Bill