From e90bdc8d05f25b2b678098fccd0cdd3aa21d45cc Mon Sep 17 00:00:00 2001
From: Olaf Hering <olaf@aepfle.de>
Date: Thu, 7 Jan 2021 07:07:07 +0000
Subject: [PATCH] configure.ac: use AC_PROG_CC_C99

Various parts of Xfce, and libraries used by Xfce, already use C99 features.
Therefore it is reasonable to expect the availibility of a capable compiler.
Current GCC releases silently default to newer C standards, starting with
gcc-5 which defaults to C11.

Replace AC_PROG_CC with AC_PROG_CC_C99 to switch the discovered, or specified,
compiler to C99.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 configure.ac.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac.in b/configure.ac.in
index 3fd6424f3..dd8018365 100644
--- a/configure.ac.in
+++ b/configure.ac.in
@@ -69,7 +69,7 @@ fi
 dnl ********************************
 dnl *** Check for basic programs ***
 dnl ********************************
-AC_PROG_CC()
+AC_PROG_CC_C99
 AC_PROG_LD()
 AM_PROG_CC_C_O()
 AC_PROG_INSTALL()
-- 
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