CMake: Introduce LLVM_CLANG_SOURCE_DIR, "tools/clang" by default. Clang will not...

[oota-llvm.git] / tools / CMakeLists.txt

diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index e66648bee1e41c8dfd0e93d57df7ae696ae1eeb4..3c679b82d3b4fa0e2962baf403f7ffca46c38da0 100644 (file)
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -59,11 +59,14 @@ if( LLVM_ENABLE_PIC )
   endif()
 endif()
 
-if( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/clang/CMakeLists.txt )
+set(LLVM_CLANG_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/clang" CACHE PATH "Path to Clang source directory")
+
+if (NOT ${LLVM_CLANG_SOURCE_DIR} STREQUAL ""
+    AND EXISTS ${LLVM_CLANG_SOURCE_DIR}/CMakeLists.txt)
   option(LLVM_BUILD_CLANG "Whether to build Clang as part of LLVM" ON)
   if (${LLVM_BUILD_CLANG})
     add_subdirectory( ${CMAKE_CURRENT_SOURCE_DIR}/clang )
   endif()
-endif( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/clang/CMakeLists.txt )
+endif ()
 
 set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} PARENT_SCOPE)