CMake: system for providing llvm-config-like features to the user.

The user can use a cmake function for obtaining the LLVM libraries
corresponding to a list of LLVM components.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110560 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -361,6 +361,8 @@ add_subdirectory(tools)
 option(LLVM_BUILD_EXAMPLES "Build LLVM example programs." OFF)
 add_subdirectory(examples)
 
+add_subdirectory(cmake/modules)
+
 install(DIRECTORY include/
   DESTINATION include
   FILES_MATCHING

cmake/modules/CMakeLists.txt

@@ -0,0 +1,11 @@
+set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/share/llvm/cmake")
+
+configure_file(
+  LLVM.cmake
+  ${llvm_cmake_builddir}/LLVM.cmake)
+
+install(FILES
+  ${llvm_cmake_builddir}/LLVM.cmake
+  LLVMConfig.cmake
+  LLVMLibDeps.cmake
+  DESTINATION share/llvm/cmake)

cmake/modules/LLVM.cmake

@@ -0,0 +1,19 @@
+set(LLVM_COMMON_DEPENDS @LLVM_COMMON_DEPENDS@)
+
+set(llvm_libs @llvm_libs@)
+
+set(llvm_lib_targets @llvm_lib_targets@)
+
+set(LLVM_TARGETS_TO_BUILD @LLVM_TARGETS_TO_BUILD@)
+
+set(LLVM_TOOLS_BINARY_DIR @LLVM_TOOLS_BINARY_DIR@)
+
+set(HAVE_LLVM_CONFIG @HAVE_LLVM_CONFIG@)
+
+if( NOT EXISTS LLVMConfig.cmake )
+  set(CMAKE_MODULE_PATH
+    ${CMAKE_MODULE_PATH}
+    "@LLVM_SOURCE_DIR@/cmake/modules")
+endif()
+
+include( LLVMConfig )

cmake/modules/LLVMConfig.cmake

@@ -49,6 +49,13 @@ function(explicit_llvm_config executable)
 endfunction(explicit_llvm_config)
 
 
+# This is a variant intended for the final user:
+function(llvm_map_components_to_libraries OUT_VAR)
+  explicit_map_components_to_libraries(result ${ARGN})
+  set( ${OUT_VAR} ${result} )
+endfunction(llvm_map_components_to_libraries)
+
+
 function(explicit_map_components_to_libraries out_libs)
   set( link_components ${ARGN} )
   foreach(c ${link_components})