[CMake] determine 32 vs 64 bit linux

[Theodore Papadopoulo]

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On 06/23/2011 03:31 AM, Jean-Christophe Fillion-Robin wrote:
> Hi Karl,
>
> You could do so something like that:
>
> set(bitness 32)
> if(CMAKE_SIZEOF_VOID_P EQUAL 8)
>   set(bitness 64)
> endif()
>
> The following macro provides a more complete example...
>
http://viewvc.slicer.org/viewvc.cgi/Slicer4/trunk/CMake/SlicerMacroGetPlatformArchitectureBitness.cmake?view=markup
>

I think the problem is more complicated than that. The proper directory
differs from one distrib to the other (eg debian and fedora at least
with some not that old versions).


Cmake knows the proper place to look for libraries, but does not
publicize it enough. Personally I do:

#   Offer the user the choice of overriding the installation directories

get_property(LIB64 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS)

if (${LIB64} STREQUAL "TRUE")
    set(LIBSUFFIX 64)
else()
    set(LIBSUFFIX "")
endif()

set(INSTALL_LIB_DIR     lib${LIBSUFFIX}/Odyssee++ CACHE PATH
"Installation directory for libraries")

which as far as I can tell selects the proper lib dir for linux.

	Theo.


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