From 9c937cf8dfe226004f611e0f160df650d62452d1 Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Mon, 24 Mar 2014 09:42:12 +0000
Subject: [CMake] Respect CMAKE_CXX_FLAGS in custom clang_compile commands

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204593 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/Modules/CompilerRTCompile.cmake | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'cmake/Modules/CompilerRTCompile.cmake')

diff --git a/cmake/Modules/CompilerRTCompile.cmake b/cmake/Modules/CompilerRTCompile.cmake
index bb2d08018..b3482e9ce 100644
--- a/cmake/Modules/CompilerRTCompile.cmake
+++ b/cmake/Modules/CompilerRTCompile.cmake
@@ -11,9 +11,19 @@ macro(clang_compile object_file source)
   if(NOT COMPILER_RT_STANDALONE_BUILD)
     list(APPEND SOURCE_DEPS clang)
   endif()
+  string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath})
+  if(is_cxx)
+    string(REPLACE " " ";" global_flags "${CMAKE_CXX_FLAGS}")
+  else()
+    string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}")
+  endif()
+  # Ignore unknown warnings. CMAKE_CXX_FLAGS may contain GCC-specific options
+  # which are not supported by Clang.
+  list(APPEND global_flags -Wno-unknown-warning-option)
+  set(compile_flags ${global_flags} ${SOURCE_CFLAGS})
   add_custom_command(
     OUTPUT ${object_file}
-    COMMAND ${COMPILER_RT_TEST_COMPILER} ${SOURCE_CFLAGS} -c -o "${object_file}"
+    COMMAND ${COMPILER_RT_TEST_COMPILER} ${compile_flags} -c -o "${object_file}"
             ${source_rpath}
     MAIN_DEPENDENCY ${source}
     DEPENDS ${SOURCE_DEPS})
-- 
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