diff --git a/clang/cmake/caches/Fuchsia-stage2.cmake b/clang/cmake/caches/Fuchsia-stage2.cmake
--- a/clang/cmake/caches/Fuchsia-stage2.cmake
+++ b/clang/cmake/caches/Fuchsia-stage2.cmake
@@ -212,16 +212,16 @@
     set(RUNTIMES_${target}+asan+noexcept_LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
 
     set(RUNTIMES_${target}+relative-vtables_LLVM_BUILD_COMPILER_RT OFF CACHE BOOL "")
-    set(RUNTIMES_${target}+relative-vtables_CMAKE_CXX_FLAGS "${RUNTIMES_${target}+relative-vtables_CMAKE_CXX_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
+    set(RUNTIMES_${target}+relative-vtables_CMAKE_CXX_FLAGS "${FUCHSIA_${target}_COMPILER_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
 
     set(RUNTIMES_${target}+relative-vtables+asan_LLVM_BUILD_COMPILER_RT OFF CACHE BOOL "")
     set(RUNTIMES_${target}+relative-vtables+asan_LLVM_USE_SANITIZER "Address" CACHE STRING "")
     set(RUNTIMES_${target}+relative-vtables+asan_LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS OFF CACHE BOOL "")
     set(RUNTIMES_${target}+relative-vtables+asan_LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS OFF CACHE BOOL "")
-    set(RUNTIMES_${target}+relative-vtables+asan_CMAKE_CXX_FLAGS "${RUNTIMES_${target}+relative-vtables+asan_CMAKE_CXX_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
+    set(RUNTIMES_${target}+relative-vtables+asan_CMAKE_CXX_FLAGS "${FUCHSIA_${target}_COMPILER_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
 
     set(RUNTIMES_${target}+relative-vtables+noexcept_LLVM_BUILD_COMPILER_RT OFF CACHE BOOL "")
-    set(RUNTIMES_${target}+relative-vtables+noexcept_CMAKE_CXX_FLAGS "${RUNTIMES_${target}+relative-vtables+noexcept_CMAKE_CXX_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
+    set(RUNTIMES_${target}+relative-vtables+noexcept_CMAKE_CXX_FLAGS "${FUCHSIA_${target}_COMPILER_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
     set(RUNTIMES_${target}+relative-vtables+noexcept_LIBCXXABI_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
     set(RUNTIMES_${target}+relative-vtables+noexcept_LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
 
@@ -231,7 +231,7 @@
     set(RUNTIMES_${target}+relative-vtables+asan+noexcept_LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS OFF CACHE BOOL "")
     set(RUNTIMES_${target}+relative-vtables+asan+noexcept_LIBCXXABI_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
     set(RUNTIMES_${target}+relative-vtables+asan+noexcept_LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
-    set(RUNTIMES_${target}+relative-vtables+asan+noexcept_CMAKE_CXX_FLAGS "${RUNTIMES_${target}+relative-vtables+asan+noexcept_CMAKE_CXX_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
+    set(RUNTIMES_${target}+relative-vtables+asan+noexcept_CMAKE_CXX_FLAGS "${FUCHSIA_${target}_COMPILER_FLAGS} -Xclang -fexperimental-relative-c++-abi-vtables" CACHE STRING "")
 
     # Use .build-id link.
     list(APPEND RUNTIME_BUILD_ID_LINK "${target}")