[CMake] cmake on the BGP

[Mathieu Malaterre]

On Tue, Sep 1, 2009 at 10:56 AM, Mathieu
Malaterre<mathieu.malaterre at gmail.com> wrote:
> On Thu, Aug 20, 2009 at 4:00 PM, Brad King<brad.king at kitware.com> wrote:
>> John R. Cary wrote:
>>> env CC=xlc_r CXX=xlC_r
>> [snip]
>>> -- The C compiler identification is GNU
>>
>> Be sure to create a fresh build tree when changing compilers.
>> CMake cached the 'cc' (gnu) compiler it found the first time
>> and did not pay attention to the environment later.
>>
>>> /gpfs/software/linux-sles10-ppc64/apps/ibmcmp-sep2008/opt/vacpp/bg/9.0/bin/xlC:
>>>  1501-216 (W) command option -dynamic is not recognized - passed to ld
>>>  /usr/bin/ld: unrecognized option '-dynamic'
>>
>> It looks like support for the C compiler was added but not
>> C++, and also that this combination is not well tested.  I
>> can help you finish adding support.  Look in Modules/Platform
>> at the files
>>
>>  Linux.cmake
>>  Linux-XL-C.cmake
>>
>> The first contains default flags for Linux, which are for GCC.
>> The second contains compiler-specific flags for the XL C compiler
>> on Linux.  Copy it to the file
>>
>>  Linux-XL-CXX.cmake
>>
>> and change the ..._C_FLAGS variable names to ..._CXX_FLAGS.
>> Also, please read through Linux.cmake and check for the options
>> in the XL compiler documentation to see if other flags need to
>> be changed.
>>
>>
>> BTW, a platform/compiler combination is officially supported
>> only if someone is contributing nightly testing to the dashboard:
>>
>>  http://www.cdash.org/CDash/index.php?project=CMake
>>
>> After we get this working, do you have about an hour of
>> spare computing time on a machine at night?  If you can
>> submit testing results then we can support this platform
>> permanently.
>
> I am trying here also and I cannot get it to work. I do not understand
> where the -fPIC is coming from.
>
> ...
>> cat Modules/Platform/Linux-XL-CXX.cmake
> message("coucou CXX")
> SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS "")
> SET(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
> ...


This works:

> cat Modules/Platform/Linux-XL-CXX.cmake
SET(CMAKE_SHARED_LIBRARY_C_FLAGS "")
SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS "")
SET(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")

Except I am getting the same linker error:


> gmake
[  4%] Built target cmsys
Linking C shared module libcmsysTestDynload.so
/usr/lib/gcc/powerpc64-suse-linux/4.1.2/../../../../lib/crt1.o:(.rodata+0x4):
undefined reference to `main'
gmake[2]: *** [Source/kwsys/libcmsysTestDynload.so] Error 1
gmake[1]: *** [Source/kwsys/CMakeFiles/cmsysTestDynload.dir/all] Error 2
gmake: *** [all] Error 2

-- 
Mathieu