[CMake] 32/64 bit flag

[Eric Noulard]

2013/12/9 pellegrini <pellegrini at ill.fr>:
> Dear CMakers,
>
> I have to build cmake files for a Fortran project using ifort compiler on
> Windows, linux and macos platform.
> That project will be linked to Winteracter Fortran library whose
> installation paths are different depending on the 32
> or 64 bit versions. Is there a way to automatically detect whether the build
> is a 32 bit or 64 bit one in order to define
> the correct path for Winteracter library ? Up to now, the only way I found
> to do this was by introducing a cmake
> option to my build (ON for 64bit build and OFF for a 32 one). I also saw the
> CMAKE_CL_64 flag that could have been
> interesting but unfortunately it is only for microsoft.

Usually you chekc the value of CMAKE_SIZEOF_VOID_P
which will be 8 on 64 bits system and 4 on 32 bits ones.

e.g. here is what I use:
# Test 32/64 bits
if("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
   message(STATUS "Target is 64 bits")
   if (WIN32)
       set(WINXXBITS Win64)
   endif(WIN32)
else("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
   message(STATUS "Target is 32 bits")
   if (WIN32)
       set(WINXXBITS Win32)
   endif(WIN32)
endif("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")


See:
http://www.cmake.org/pipermail/cmake/2011-February/042752.html
or
cmake --help-variable CMAKE_SIZEOF_VOID_P
>
> thanks for your help
>
> Eric
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-- 
Erk
L'élection n'est pas la démocratie -- http://www.le-message.org