[CMake] How to get find_package(ZLIB) to set ZLIB_LIBRARIES to 32-bit version ?

[Rolf Eike Beer]

Am Dienstag, 24. Juni 2014, 22:32:22 schrieb Glenn Coombs:
> This seems to be the recommended way to link against the zlib library:
> 
> find_package(ZLIB)if (ZLIB_FOUND)
>     include_directories(${ZLIB_INCLUDE_DIRS})
>     target_link_libraries(MyProg ${ZLIB_LIBRARIES})
> endif()
> 
> When I run this on linux I see that ZLIB_LIBRARIES has the value
> /usr/lib64/libz.so.  On this machine gcc creates 64-bit binaries by
> default.  In my CMakeLists.txt I have an option for building 32-bit which
> adds "-m32" to the compiler and linker command lines.  However the
> ZLIB_LIBRARIES variable is still returning the 64-bit version
> (/usr/lib64/libz.so) instead of the 32-bit version (/usr/lib/libz.so).

That means that CMake doesn't know that it is building a 32 bit executable, 
which is a bad idea for reasons you already discovered. Try CC="gcc -m32" 
cmake ... in a clean build tree.

Eke
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