Index: llvm/trunk/utils/gn/build/write_cmake_config.gni
===================================================================
--- llvm/trunk/utils/gn/build/write_cmake_config.gni
+++ llvm/trunk/utils/gn/build/write_cmake_config.gni
@@ -38,8 +38,8 @@
     ]
     args = [
              "-o",
-             rebase_path(outputs[0], root_out_dir),
-             rebase_path(sources[0], root_out_dir),
+             rebase_path(outputs[0], root_build_dir),
+             rebase_path(sources[0], root_build_dir),
            ] + invoker.values
 
     forward_variables_from(invoker,