[modules] Centralize the module cache.

This reduces the build size from 17G to 1.9G on my machine.

llvm-svn: 282704

diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 0268548..3c1d0d7 100644 (file)
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -475,7 +475,7 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
   endif()
   if (LLVM_ENABLE_MODULES)
     set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
-    set(module_flags "-fmodules -fmodules-cache-path=module.cache")
+    set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache")
     if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
       # On Darwin -fmodules does not imply -fcxx-modules.
       set(module_flags "${module_flags} -fcxx-modules")