[CMake] LLVM_PROFDATA_FILE only works if you're using clang, so we should error out...

[oota-llvm.git] / CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e54ec991f17f3c0f92c91922721ea61fd7e85f4..d420e64228ad0659fa1e52a6712f55e28a581d6b 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -548,6 +548,8 @@ if(APPLE AND DARWIN_LTO_LIBRARY)
     "${CMAKE_EXE_LINKER_FLAGS} -Wl,-lto_library -Wl,${DARWIN_LTO_LIBRARY}")
   set(CMAKE_SHARED_LINKER_FLAGS
     "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-lto_library -Wl,${DARWIN_LTO_LIBRARY}")
+  set(CMAKE_MODULE_LINKER_FLAGS
+    "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-lto_library -Wl,${DARWIN_LTO_LIBRARY}")
 endif()
 
 # Work around a broken bfd ld behavior. When linking a binary with a
@@ -588,6 +590,17 @@ endif( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )
 # use export_executable_symbols(target).
 set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
 
+set(LLVM_PROFDATA_FILE "" CACHE FILEPATH
+  "Profiling data file to use when compiling in order to improve runtime performance.")
+
+if(LLVM_PROFDATA_FILE AND EXISTS ${LLVM_PROFDATA_FILE})
+  if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
+    add_definitions("-fprofile-instr-use=${LLVM_PROFDATA_FILE}")
+  else()
+    message(FATAL_ERROR "LLVM_PROFDATA_FILE can only be specified when compiling with clang")
+  endif()
+endif()
+
 include(AddLLVM)
 include(TableGen)