From 07aaa34cd418c44f7bc653fafbf49f07fc71b2bf Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Fri, 21 Jan 2022 13:39:30 +0000
Subject: [PATCH] Fix GH-7978: sockets extension compilation errors

We fix the `ucred` detection when custom `CFLAGS` are in use.

Closes GH-7981.
---
 NEWS                  | 1 +
 ext/sockets/config.m4 | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/NEWS b/NEWS
index 285d6265ee9..d32c3fb2f11 100644
--- a/NEWS
+++ b/NEWS
@@ -22,6 +22,7 @@ PHP                                                                        NEWS
 
 - Sockets:
   . Fixed ext/sockets build on Haiku. (David Carlier)
+  . Fixed bug GH-7978 (sockets extension compilation errors). (David Carlier)
 
 - Standard:
   . Fixed bug GH-7875 (mails are sent even if failure to log throws exception).
diff --git a/ext/sockets/config.m4 b/ext/sockets/config.m4
index d4f92082c3b..aafedcb99dd 100644
--- a/ext/sockets/config.m4
+++ b/ext/sockets/config.m4
@@ -67,6 +67,9 @@ if test "$PHP_SOCKETS" != "no"; then
   AC_CACHE_CHECK([if ancillary credentials uses ucred],[ac_cv_ucred],
   [
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
 #include <sys/socket.h>
   ]], [[struct ucred u = {.gid = 0};]])],
       [ac_cv_ucred=yes], [ac_cv_ucred=no])