CMake changes for rdar://27110616

CMakeLists.txt

@@ -606,28 +606,7 @@ endif()
 
 if (CLANG_BUILT_STANDALONE OR CMAKE_VERSION VERSION_EQUAL 3 OR
     CMAKE_VERSION VERSION_GREATER 3)
-  # Generate a list of CMake library targets so that other CMake projects can
-  # link against them. LLVM calls its version of this file LLVMExports.cmake, but
-  # the usual CMake convention seems to be ${Project}Targets.cmake.
-  set(CLANG_INSTALL_PACKAGE_DIR share/clang/cmake)
-  set(clang_cmake_builddir "${CMAKE_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}")
-  get_property(CLANG_EXPORTS GLOBAL PROPERTY CLANG_EXPORTS)
-  export(TARGETS ${CLANG_EXPORTS} FILE ${clang_cmake_builddir}/ClangTargets.cmake)
-
-  # Install a <prefix>/share/clang/cmake/ClangConfig.cmake file so that
-  # find_package(Clang) works. Install the target list with it.
-  install(EXPORT ClangTargets DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
-
-  install(FILES
-    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules/ClangConfig.cmake
-    DESTINATION share/clang/cmake)
-
-  # Also copy ClangConfig.cmake to the build directory so that dependent projects
-  # can build against a build directory of Clang more easily.
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules/ClangConfig.cmake
-    ${CLANG_BINARY_DIR}/share/clang/cmake/ClangConfig.cmake
-    COPYONLY)
+  add_subdirectory(cmake/modules)
 endif ()
 
 if (CLANG_ENABLE_BOOTSTRAP)

cmake/modules/CMakeLists.txt

@@ -0,0 +1,47 @@
+# Generate a list of CMake library targets so that other CMake projects can
+# link against them. LLVM calls its version of this file LLVMExports.cmake, but
+# the usual CMake convention seems to be ${Project}Targets.cmake.
+set(CLANG_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/clang)
+set(clang_cmake_builddir "${CMAKE_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}")
+
+get_property(CLANG_EXPORTS GLOBAL PROPERTY CLANG_EXPORTS)
+export(TARGETS ${CLANG_EXPORTS} FILE ${clang_cmake_builddir}/ClangTargets.cmake)
+
+# Generate ClangConfig.cmake for the build tree.
+set(CLANG_CONFIG_CMAKE_DIR "${clang_cmake_builddir}")
+set(CLANG_CONFIG_EXPORTS_FILE "${clang_cmake_builddir}/ClangTargets.cmake")
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/ClangConfig.cmake.in
+  ${clang_cmake_builddir}/ClangConfig.cmake
+  @ONLY)
+set(CLANG_CONFIG_CMAKE_DIR)
+set(CLANG_CONFIG_EXPORTS_FILE)
+
+# Generate ClangConfig.cmake for the install tree.
+set(CLANG_CONFIG_CODE "
+# Compute the installation prefix from this LLVMConfig.cmake file location.
+get_filename_component(CLANG_INSTALL_PREFIX \"\${CMAKE_CURRENT_LIST_FILE}\" PATH)")
+# Construct the proper number of get_filename_component(... PATH)
+# calls to compute the installation prefix.
+string(REGEX REPLACE "/" ";" _count "${CLANG_INSTALL_PACKAGE_DIR}")
+foreach(p ${_count})
+  set(CLANG_CONFIG_CODE "${CLANG_CONFIG_CODE}
+get_filename_component(CLANG_INSTALL_PREFIX \"\${CLANG_INSTALL_PREFIX}\" PATH)")
+endforeach(p)
+set(CLANG_CONFIG_CMAKE_DIR "\${CLANG_INSTALL_PREFIX}/${CLANG_INSTALL_PACKAGE_DIR}")
+set(CLANG_CONFIG_EXPORTS_FILE "\${CLANG_CMAKE_DIR}/ClangTargets.cmake")
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/ClangConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/ClangConfig.cmake
+  @ONLY)
+set(CLANG_CONFIG_CODE)
+set(CLANG_CONFIG_CMAKE_DIR)
+set(CLANG_CONFIG_EXPORTS_FILE)
+
+if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+  install(EXPORT ClangTargets DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
+
+  install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/ClangConfig.cmake
+    DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
+endif()

cmake/modules/ClangConfig.cmake.in

@@ -0,0 +1,11 @@
+# This file allows users to call find_package(Clang) and pick up our targets.
+
+find_package(LLVM REQUIRED CONFIG)
+
+@CLANG_CONFIG_CODE@
+
+set(CLANG_EXPORTED_TARGETS "@CLANG_EXPORTS@")
+set(CLANG_CMAKE_DIR "@CLANG_CONFIG_CMAKE_DIR@")
+
+# Provide all our library targets to users.
+include("@CLANG_CONFIG_EXPORTS_FILE@")