Install cmake files to lib/cmake/llvm

This is the right location for platform-specific files.

On some distributions (e. g. Exherbo), a package can be installed for several
architectures in parallel, but the architecture-independent files are shared.
Therefore, we must not install architecture-dependent files (like the CMake
config and export files) to share/.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259821 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 891198c)

Author: olesalscheider

cmake/modules/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(LLVM_INSTALL_PACKAGE_DIR share/llvm/cmake)
+set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
 set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
 
 get_property(LLVM_EXPORTS GLOBAL PROPERTY LLVM_EXPORTS)

docs/CMake.rst

@@ -537,16 +537,16 @@ The ``find_package(...)`` directive when used in CONFIG mode (as in the above
 example) will look for the ``LLVMConfig.cmake`` file in various locations (see
 cmake manual for details).  It creates a ``LLVM_DIR`` cache entry to save the
 directory where ``LLVMConfig.cmake`` is found or allows the user to specify the
-directory (e.g. by passing ``-DLLVM_DIR=/usr/share/llvm/cmake`` to
+directory (e.g. by passing ``-DLLVM_DIR=/usr/lib/cmake/llvm`` to
 the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
 
 This file is available in two different locations.
 
-* ``<INSTALL_PREFIX>/share/llvm/cmake/LLVMConfig.cmake`` where
+* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
   ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
-  On Linux typically this is ``/usr/share/llvm/cmake/LLVMConfig.cmake``.
+  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
 
-* ``<LLVM_BUILD_ROOT>/share/llvm/cmake/LLVMConfig.cmake`` where
+* ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
   available when building LLVM with CMake.**