From fd264310c26d34f206b26b49c0801f1965efbea1 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i@maskray.me>
Date: Thu, 28 Dec 2017 22:23:59 -0800
Subject: [PATCH] [waf] Add -std=c++11 when CXXFLAGS is specified without -std=
 setting

---
 wscript | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/wscript b/wscript
index e4570816..b5b0d125 100644
--- a/wscript
+++ b/wscript
@@ -137,6 +137,8 @@ def configure(ctx):
     # If environment variable CXXFLAGS is unset, provide a sane default.
     if not ctx.env.CXXFLAGS:
       ctx.env.CXXFLAGS = cxxflags
+    elif all(not x.startswith('-std=') for x in ctx.env.CXXFLAGS):
+      ctx.env.CXXFLAGS.append('-std=c++11')
     if not ctx.env.LDFLAGS:
       ctx.env.LDFLAGS = ldflags
   else: