[CMake] Need cmake to work on AIX 5.3

[Arindam Mukherjee]

On Tue, Oct 9, 2012 at 9:21 PM, Bill Hoffman <bill.hoffman at kitware.com> wrote:
> On 10/9/2012 5:58 AM, Arindam Mukherjee wrote:
>>
>> Hi,
>>
>> I have to get a build of my product on AIX 5.3 (powerpc) because of
>> backward compatibility concerns. The product builds fine on such a
>> system using conventional gmake. However, cmake fails to identify the
>> xlc/xlC compilers correctly and reports them as broken. What is the
>> way to fix this?
>>
>> Could I force cmake to recognize the compilers correctly in some
>> manual way. I tried using CMAKE_FORCE_C_COMPILER and
>> CMAKE_FORCE_CXX_COMPILER but it didn't work. I am not sure of the
>> arguments to pass either. Any help is greatly appreciated.
>
> Can you post the errors that you are getting?  There is no way to help with
> the information you have posted.  You need the compiler to work, forcing it
> will just cause trouble later.
>
> We test on two different AIX machines nightly, so the compilers should work.
>

Hi Bill,

Here is the output of running cmake version 2.8.9 on AIX 5.2.

http://pastebin.com/yM46Ncse

What I can see is that cmake fails to identify the compiler. Perhaps
for that reason it seems to be trying an erroneous command-line later:

/usr/bin/xlc_r CMakeFiles/cmTryCompileExec3576455604.dir/testCCompiler.c.o
-o cmTryCompileExec3576455604 /usr/lib /lib

I have got the same results by exporting CC=xlc and CXX=xlC and also
CC=xlc_r and CXX=xlC_r. The version of IBM Visual Age on these
machines is v7.0. I do not encounter any problems with normal Makefile
based builds using this toolchain.

I built cmake from source on this machine without any problems. I have
a functional cmake-based build of my product on AIX 6.1 and Visual Age
v8.0 which runs without any issues.

Thanks.
Arindam