From: Steffan Karger <steffan@karger.me>
Date: Fri, 16 Sep 2016 15:40:36 +0000 (+0200)
Subject: Make gnu89 support explicit
X-Git-Tag: contains~16
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=130c27b1f24a33c77e01b2cf82c3427699153967;p=thirdparty%2Fopenvpn.git

Make gnu89 support explicit

In the release/2.3 branch we support gnu89, basically to keep
pre-2015 MSVC happy.  Old gcc (<5) defaulted to gnu89.  But
gcc 5+ and clang default to gnu11/c11.  This patch makes our
gnu89 support explicit, such these newer compilers will also
point out gnu89 violations to developers.

v2: only set -std=gnu89 if no -std flag is present in $CFLAGS

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: David Sommerseth <davids@openvpn.net>
Message-Id: 1474040436-9855-1-git-send-email-steffan@karger.me
URL: http://www.mail-archive.com/search?l=mid&q=1474040436-9855-1-git-send-email-steffan@karger.me
Signed-off-by: David Sommerseth <davids@openvpn.net>
---

diff --git a/configure.ac b/configure.ac
index f83b03821..faa496135 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1059,6 +1059,12 @@ if test "${enable_pkcs11}" = "yes"; then
 	)
 fi
 
+# Set -std=gnu89 unless user already specified a -std=
+case "${CFLAGS}" in
+  *-std=*) ;;
+  *)       CFLAGS="${CFLAGS} -std=gnu89" ;;
+esac
+
 if test "${enable_pedantic}" = "yes"; then
 	enable_strict="yes"
 	CFLAGS="${CFLAGS} -pedantic"