[CMake] cmake on the BGP

[John R. Cary]

Brad King wrote:
>
> 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.
Got it.  Now 'rm -rf' on the build tree.
>
>> /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.

So do I understand correctly that one uses

Linux-XL-CXX.cmake

to override settings in Linux.cmake?

Here is what I have now:

login3.surveyor$ ls ../Modules/Platform/Linux-XL-C*.cmake
../Modules/Platform/Linux-XL-C.cmake  ../Modules/Platform/Linux-XL-CXX.cmake
login3.surveyor$ cat ../Modules/Platform/Linux-XL-C*.cmake
SET(CMAKE_SHARED_LIBRARY_C_FLAGS "")
SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
SET(CMAKE_SHARED_LIBRARY_C_FLAGS "-DPIC")
SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS "")
SET(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS "-DPIC")

The bootstrap "make" dies now at

[  5%] Building C object 
Source/kwsys/CMakeFiles/cmsysTestDynload.dir/testDynload.o
Linking C shared module libcmsysTestDynload.so
/usr/lib/gcc/powerpc64-suse-linux/4.1.2/../../../../lib/crt1.o:(.rodata+0x4): 
undefined reference to `main'
make[2]: *** [Source/kwsys/libcmsysTestDynload.so] Error 1
make[1]: *** [Source/kwsys/CMakeFiles/cmsysTestDynload.dir/all] Error 2
make: *** [all] Error 2


Can I turn off shared lib usage altogether?  (Problematic on BGP).
I did not see

Suppose I get a CMake that has the above in its
share dir, and I want to use my own Linux-XL-CXX.cmake.
Can I simply put my file in my project's top CMake dir?  Do I have
to include it somehow?
>
>
> 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 think I will not be able to get permission to run nightly tests at
this supercomputer center.  My guess, however, is that VisualAge
and XL are basically the same, and I could get VisualAge on my
Linux box.

John Cary


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