cmake: Add a flag to enable LTO
This adds -DLLVM_ENABLE_LTO, rather than forcing people to manually
add -flto to the various _FLAGS variables.
llvm-svn: 259766
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 9b6a590..99b2318 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -656,6 +656,13 @@
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
+option(LLVM_ENABLE_LTO "Enable link-time optimization" OFF)
+append_if(LLVM_ENABLE_LTO "-flto"
+ CMAKE_CXX_FLAGS
+ CMAKE_C_FLAGS
+ CMAKE_EXE_LINKER_FLAGS
+ CMAKE_SHARED_LINKER_FLAGS)
+
# Plugin support
# FIXME: Make this configurable.
if(WIN32 OR CYGWIN)