From 8aa42b826c2037ddc68a32712caf2dfbda9981f8 Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@opensourcerouting.org>
Date: Sun, 29 Jan 2017 00:51:45 +0100
Subject: [PATCH] build: bump to C11

Funnily enough, "gnu11" is gcc's default in 5.x if you don't specify
anything, yet there is no "AC_PROG_CC_C11" in autoconf.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index a8e820a237..b8cebd8d23 100755
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,7 @@ AM_PROG_CC_C_O
 dnl remove autoconf default "-g -O2"
 CFLAGS="$orig_cflags"
 AC_PROG_CC_C99
+dnl NB: see C11 below
 
 AC_PROG_EGREP
 PKG_PROG_PKG_CONFIG
@@ -119,6 +120,13 @@ dnl ICC won't bail on unknown options without -diag-error 10006
 dnl need to do this first so we get useful results for the other options
 AC_C_FLAG([-diag-error 10006])
 
+dnl AC_PROG_CC_C99 may change CC to include -std=gnu99 or something
+ac_cc="$CC"
+CC="${CC% -std=gnu99}"
+CC="${CC% -std=c99}"
+
+AC_C_FLAG([-std=gnu11], [CC="$ac_cc"], [CC="$CC -std=gnu11"])
+
 dnl if the user specified any CFLAGS, we don't add "-g -Os/-O2" here
 if test "z$orig_cflags" = "z"; then
   AC_C_FLAG([-g])
-- 
2.39.5