From cb554de22232dd60f35883efa86e9470022a4569 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Mon, 22 Oct 2012 19:44:17 +0000
Subject: [PATCH] Allow building libc++ with any custom -std=xxx flag.  Note
 that using -std=gnu++98 will give a lot of warnings with clang, so please use
 -std=c++0x or higher, or use NO_WERROR.

MFC after:	1 week
---
 lib/libc++/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/libc++/Makefile b/lib/libc++/Makefile
index 6e95823677e3..26877eebe51b 100644
--- a/lib/libc++/Makefile
+++ b/lib/libc++/Makefile
@@ -53,7 +53,9 @@ cxxrt_${_S}:
 
 WARNS=		0
 CFLAGS+=	-I${HDRDIR} -I${LIBCXXRTDIR} -nostdlib -DLIBCXXRT
+.if !defined(CXXFLAGS) || ${CXXFLAGS:M-std=*}" == ""
 CXXFLAGS+=	-std=c++0x
+.endif
 
 DPADD=		${LIBCXXRT}
 LDADD=		-lcxxrt