[llvm] c572c6a - [cmake] Add LLVM_THINLTO_CACHE_PATH

[Tobias Hieta via llvm-commits]

Author: Tobias Hieta
Date: 2022-03-14T07:47:36+01:00
New Revision: c572c6ae5627837084389894c5614aed8a889167

URL: https://github.com/llvm/llvm-project/commit/c572c6ae5627837084389894c5614aed8a889167
DIFF: https://github.com/llvm/llvm-project/commit/c572c6ae5627837084389894c5614aed8a889167.diff

LOG: [cmake] Add LLVM_THINLTO_CACHE_PATH

This allows you to set a custom path to the ThinLTO cache so that
it can be shared when building in several different build directories.

Reviewed By: phosek

Differential Revision: https://reviews.llvm.org/D121215

Added: 
    

Modified: 
    llvm/cmake/modules/HandleLLVMOptions.cmake

Removed: 
    


################################################################################
diff  --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index fcaa8f20bf941..a8907a3bc0423 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -1082,6 +1082,8 @@ if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE)
   message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified")
 endif()
 
+set(LLVM_THINLTO_CACHE_PATH "${PROJECT_BINARY_DIR}/lto.cache" CACHE STRING "Set ThinLTO cache path. This can be used when building LLVM from several 
diff erent directiories.")
+
 if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK AND NOT MINGW)
   message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)")
 endif()
@@ -1095,16 +1097,16 @@ if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
   # improves incremental build time.
   # FIXME: We should move all this logic into the clang driver.
   if(APPLE)
-    append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
+    append("-Wl,-cache_path_lto,${LLVM_THINLTO_CACHE_PATH}"
            CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
   elseif((UNIX OR MINGW) AND LLVM_USE_LINKER STREQUAL "lld")
-    append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
+    append("-Wl,--thinlto-cache-dir=${LLVM_THINLTO_CACHE_PATH}"
            CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
   elseif(LLVM_USE_LINKER STREQUAL "gold")
-    append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
+    append("-Wl,--plugin-opt,cache-dir=${LLVM_THINLTO_CACHE_PATH}"
            CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
   elseif(LINKER_IS_LLD_LINK)
-    append("/lldltocache:${PROJECT_BINARY_DIR}/lto.cache"
+    append("/lldltocache:${LLVM_THINLTO_CACHE_PATH}"
            CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
   endif()
 elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL")