Fix clang tooling build on Linux (shim CMake in LLVM tree).

tools/clang/CMakeLists.txt

 cmake_minimum_required(VERSION 2.8.8)
 project(ChromeExtras)
 enable_testing()
 
 list(APPEND CMAKE_MODULE_PATH "${LLVM_BUILD_DIR}/share/llvm/cmake")
 
 # These tools are built using LLVM's build system, not Chromium's.
-# It expects LLVM_SRC_DIR and LLVM_BUILD_DIR to be set.
-# For example:
-#
-# cmake -GNinja \
-#   -DLLVM_BUILD_DIR=$CHROMIUM_SRC_DIR/third_party/llvm-build/Release+Asserts \
-#   -DLLVM_SRC_DIR=$CHROMIUM_SRC_DIR/third_party/llvm \
-#   -DCHROMIUM_TOOLS=blink_gc_plugin;plugin \
-#   $CHROMIUM_SRC_DIR/tools/clang/
-# ninja
+# The build script generates a shim CMakeLists.txt in the LLVM source tree,
+# which simply forwards to this file.
 
 
-include(LLVMConfig)
-include(AddLLVM)
-include(HandleLLVMOptions)
-
 # Use rpath to find the bundled standard C++ library.
 set(CMAKE_BUILD_WITH_INSTALL_RPATH ON)
 if (APPLE)
   set(CMAKE_INSTALL_NAME_DIR "@rpath")
   set(CMAKE_INSTALL_RPATH "@executable_path/../lib")
 else(UNIX)
   set(CMAKE_INSTALL_RPATH "\$ORIGIN/../lib")
 endif()
 
-set(LLVM_RUNTIME_OUTPUT_INTDIR "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin")
-set(LLVM_LIBRARY_OUTPUT_INTDIR "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib")
+include_directories("${CMAKE_SOURCE_DIR}/include"
+                    "${CMAKE_SOURCE_DIR}/tools/clang/include"
+                    "${CMAKE_BINARY_DIR}/include"
+                    "${CMAKE_BINARY_DIR}/tools/clang/include")
 
-include_directories("${LLVM_SRC_DIR}/include"
-                    "${LLVM_SRC_DIR}/tools/clang/include"
-                    "${LLVM_BUILD_DIR}/include"
-                    "${LLVM_BUILD_DIR}/tools/clang/include")
-
-link_directories("${LLVM_SRC_DIR}/lib"
-                 "${LLVM_SRC_DIR}/tools/clang/lib"
-                 "${LLVM_BUILD_DIR}/lib"
-                 "${LLVM_BUILD_DIR}/tools/clang/lib")
+link_directories("${CMAKE_SOURCE_DIR}/lib"
+                 "${CMAKE_SOURCE_DIR}/tools/clang/lib"
+                 "${CMAKE_BINARY_DIR}/lib"
+                 "${CMAKE_BINARY_DIR}/tools/clang/lib")
 
 # cr_add_test(
 #   name
 #   testprog
 #   arguments...
 #   )
 function(cr_add_test name testprog)
   add_test(NAME ${name} COMMAND ${testprog} ${ARGN})
-  add_dependencies(check-all ${name})
+  add_dependencies(cr-check-all ${name})
 endfunction(cr_add_test)
 
 # Tests for all enabled tools can be run by building this target.
-add_custom_target(check-all COMMAND ${CMAKE_CTEST_COMMAND} -V)
+add_custom_target(cr-check-all COMMAND ${CMAKE_CTEST_COMMAND} -V)
+
+function(cr_install)
+  install(${ARGN} COMPONENT chrome-tools OPTIONAL)
+endfunction(cr_install)
+
+# Custom install target, so the chrome tools can be installed without installing
+# all the other LLVM targets.
+add_custom_target(cr-install COMMAND
+  ${CMAKE_COMMAND} -D COMPONENT=chrome-tools -P cmake_install.cmake)
 
 foreach(tool ${CHROMIUM_TOOLS})
   add_subdirectory(${tool})
 endforeach(tool)