From 591edbb11c73a51d5d6657ef4e3b585d556d7c68 Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@qt.io>
Date: Wed, 14 Feb 2018 13:40:57 +0100
Subject: Detect C standard and try using the most recent one (take 2)

Fixes the default C version used with gcc < 5

Change-Id: I948dece961caed8e6b181e1c6e6b9dc43c46583e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
---
 mkspecs/features/default_post.prf | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'mkspecs/features/default_post.prf')

diff --git a/mkspecs/features/default_post.prf b/mkspecs/features/default_post.prf
index 5367b17973..ad4a5f6365 100644
--- a/mkspecs/features/default_post.prf
+++ b/mkspecs/features/default_post.prf
@@ -143,6 +143,19 @@ c++11|c++14|c++1z {
     unset(cxxstd)
 }
 
+c99|c11 {
+    c11:       cstd = C11
+    else:      cstd = C99
+
+    !isEmpty(QMAKE_CFLAGS_GNU$$cstd) {
+        !strict_c|isEmpty(QMAKE_CFLAGS_$$cstd): cstd = GNU$$cstd
+    }
+
+    QMAKE_CFLAGS += $$eval(QMAKE_CFLAGS_$$cstd)
+
+    unset(cstd)
+}
+
 utf8_source {
     QMAKE_CFLAGS += $$QMAKE_CFLAGS_UTF8_SOURCE
     QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_UTF8_SOURCE
-- 
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