From 70c6fe4d8d5512e03378992bbe03085070d4105e Mon Sep 17 00:00:00 2001
From: Nico Weber <nicolasweber@gmx.de>
Date: Tue, 19 Jan 2016 20:52:17 +0000
Subject: [PATCH] Fix bootstrap -Werror builds after clang r258128

llvm-svn: 258181
---
 cmake/modules/HandleLLVMOptions.cmake | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index 6db258ff66a..c946b791cb4 100644
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/cmake/modules/HandleLLVMOptions.cmake
@@ -403,6 +403,9 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
     append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
     append("-Wcast-qual" CMAKE_CXX_FLAGS)
 
+    # FIXME: Clean up the codebase, then remove this flag.
+    add_flag_if_supported("-Wno-expansion-to-defined" EXPANSION_TO_DEFINED_FLAG)
+
     # Turn off missing field initializer warnings for gcc to avoid noise from
     # false positives with empty {}. Turn them on otherwise (they're off by
     # default for clang).