[PATCH] D121215: [cmake] Add LLVM_THINLTO_CACHE_PATH

[Tobias Hieta via Phabricator via llvm-commits]

thieta created this revision.
thieta added a reviewer: phosek.
Herald added subscribers: inglorion, mgorny.
Herald added a project: All.
thieta requested review of this revision.
Herald added a project: LLVM.

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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121215

Files:
  llvm/cmake/modules/HandleLLVMOptions.cmake


Index: llvm/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm/cmake/modules/HandleLLVMOptions.cmake
+++ llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -1082,6 +1082,8 @@
   message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified")
 endif()
 
+set(LLVM_THINLTO_CACHE_PATH "${PROJECT_BINARY_DIR}/lto.cache" CACHE STRING "Set ThinLTO cache path. This can be used when building LLVM from several different directiories.")
+
 if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK AND NOT MINGW)
   message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)")
 endif()
@@ -1095,16 +1097,16 @@
   # improves incremental build time.
   # FIXME: We should move all this logic into the clang driver.
   if(APPLE)
-    append("-Wl,-cache_path_lto,${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")


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