commit 52ee16764409ad3eb3513434b4faa19c45a16079
author willson-chen <willson.chenwx@gmail.com> Tue Jul 30 16:01:13 2019 +0800
committer Cosmin Truta <ctruta@gmail.com> Mon Apr 27 00:46:06 2020 -0400
tree 477268f1ce9d1ea7367250fcc9b1a6e3591ea2b6
parent eb6767273a4eb5d6f4ad528370d7262cf7aa220c

Fix a warning on Linux caused by _BSD_SOURCE

I got a warning while compiling under Ubuntu 18.04 and gcc 7.4:
"__BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

Quote from the Linux Programmer's Manual:
"To allow code that requires _BSD_SOURCE in glibc 2.19 and earlier and
_DEFAULT_SOURCE in glibc 2.20 and later to compile without warnings,
define both _BSD_SOURCE and _DEFAULT_SOURCE."

contrib/libtests/pngvalid.c

diff --git a/contrib/libtests/pngvalid.c b/contrib/libtests/pngvalid.c
index d800110..9a2da6a 100644
--- a/contrib/libtests/pngvalid.c
+++ b/contrib/libtests/pngvalid.c
@@ -22,6 +22,7 @@
 #define _ISOC99_SOURCE 1 /* For floating point */
 #define _GNU_SOURCE 1 /* For the floating point exception extension */
 #define _BSD_SOURCE 1 /* For the floating point exception extension */
+#define _DEFAULT_SOURCE 1 /* For the floating point exception extension */
 
 #include <signal.h>
 #include <stdio.h>