[CMake] How can I place a 64bit library build into /usr/lib64?

[Theodore Papadopoulo]

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cmake knows the difference for its internal search for libraries...
I use this knowledge in the following manner:

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} CACHE PATH "Installation
directory for libraries")
mark_as_advanced(INSTALL_LIB_DIR)


and then using INSTALL_LIB_DIR everywhere it is needed.

It would be good if cmake was automatically doing such an adjustement....

Hope this helps.

	Theo.

On 07/29/2013 01:49 PM, Gregor Jasny wrote:
> Hi Zack,
> 
> On 7/28/13 5:20 AM, Zack Perry wrote:
>> I have been trying to build libc++ <http://libc++.llvm.org/> on a
>> RHEL 6.4 64bit box. The library comes with a CMakeLists.txt 
>> <http://llvm.org/svn/llvm-project/libcxx/trunk/CMakeLists.txt>.
>> 
>> Running the following:
>> 
>> CC=clang CXX=clang++ cmake -G "Unix Makefiles" 
>> -DLIBCXX_CXX_ABI=libcxxabi 
>> -DLIBCXX_LIBCXXABI_INCLUDE_PATHS="/usr/include/c++abi/3.3/" 
>> -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
>> -DLIB_SUFFIX=64 $HOME/clang3.3/libs/libcxx
>> 
>> 
>> It can successfully generate a Makefile in the build
>> subdirectory (it's an out-of-source build).
>> 
>> By adding a few CPack related statements, I also can create a
>> RPM using 'make package'.  But, a rpm -qlp
>> libcxx-3-3-0.el6.x86_64.rpm shows that the shared library is
>> installed in /usr/lib, not /usr/lib64, as 64bit libraries on RHEL
>> 6.x should go.
> 
> Not sure if this will help when building clang:
> 
> If you include("GNUInstallDirs") you'll get a LIBRDIR variable
> defined that will be lib, lib64, or lib/<multiarch-tuple> depending
> on your distribution and architecture.
> 
> You could use this variable instead of a generic "lib" in the
> target install parameters.
> 
> Thanks, Gregor
> 
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