From 475b3d3856886450368095f0801c000eaaf4f5fd Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@apple.com>
Date: Wed, 28 Jul 2010 20:26:34 +0000
Subject: [PATCH] Use a C++ compiler for the atomic builtin check since we'll
 be using a C++ compiler to build.
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Patch by Török Edwin!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109646 91177308-0d34-0410-b5e6-96231b3b80d8
---
 autoconf/configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 9541b8a46c3..0924a777b4c 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1355,6 +1355,9 @@ fi
 
 dnl atomic builtins are required for threading support.
 AC_MSG_CHECKING(for GCC atomic builtins)
+dnl Since we'll be using these atomic builtins in C++ files we should test
+dnl the C++ compiler.
+AC_LANG_PUSH([C++])
 AC_LINK_IFELSE(
   AC_LANG_SOURCE(
     [[int main() {
@@ -1366,6 +1369,7 @@ AC_LINK_IFELSE(
         return 0;
       }
     ]]),
+  AC_LANG_POP([C++])
   AC_MSG_RESULT(yes)
   AC_DEFINE(LLVM_MULTITHREADED, 1, Build multithreading support into LLVM),
   AC_MSG_RESULT(no)