Re-apply r296730, "cmake: Configure the ThinLTO cache directory when using ELF lld or gold."
All known cache-related bugs observed when self hosting have been fixed (r296907
and r297853).
llvm-svn: 297854
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index d776285..8d9051c 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -715,11 +715,20 @@
if(NOT LINKER_IS_LLD_LINK)
append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
- # On darwin, enable the lto cache. This improves initial build time a little
- # since we re-link a lot of the same objects, and significantly improves
- # incremental build time.
- append_if(APPLE "-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
- CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
+ # If the linker supports it, enable the lto cache. This improves initial build
+ # time a little since we re-link a lot of the same objects, and significantly
+ # improves incremental build time.
+ # FIXME: We should move all this logic into the clang driver.
+ if(APPLE)
+ append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
+ CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
+ elseif(UNIX AND LLVM_USE_LINKER STREQUAL "lld")
+ append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
+ CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
+ elseif(LLVM_USE_LINKER STREQUAL "gold")
+ append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
+ CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
+ endif()
elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL")
append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)