From b600c928b221a001faeab7bd92786d0b25714bc8 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Fri, 1 Jan 2021 19:18:33 +0100
Subject: Avoid trying to use both C99 and C11 on the same command line

---
 extras/autowaf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/extras/autowaf.py b/extras/autowaf.py
index f932e41..662f9b7 100644
--- a/extras/autowaf.py
+++ b/extras/autowaf.py
@@ -689,7 +689,7 @@ def set_c_lang(conf, lang, **kwargs):
         # MSVC has no hope or desire to compile C99, just compile as C++
         conf.env.append_unique('CFLAGS', ['/TP'])
         return True
-    else:
+    elif not (lang == 'c99' and '-std=c11' in conf.env.CFLAGS):
         flag = '-std=%s' % lang
         if conf.check(features='c cstlib',
                       cflags=flag_check_flags(conf, conf.env.CFLAGS) + [flag],
-- 
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