From 2e64472d16b00389134ca38b6c81efe5d7be469a Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Sun, 7 Aug 2022 16:55:07 +0200
Subject: [PATCH] BUILD: cfgparse: always defined _GNU_SOURCE for sched.h and
 crypt.h

_GNU_SOURCE used to be defined only when USE_LIBCRYPT was set. It's also
needed for sched_setaffinity() to be exported. As a side effect, when
USE_LIBCRYPT is not set, a warning is emitted, as Ilya found and reported
in issue #1815. Let's just define _GNU_SOURCE regardless of USE_LIBCRYPT,
and also explicitly add sched.h, as right now it appears to be inherited
from one of the other includes.

This should be backported to 2.4.
---
 src/cfgparse.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/cfgparse.c b/src/cfgparse.c
index 52979390b..fc447d6eb 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -10,10 +10,10 @@
  *
  */
 
-#ifdef USE_LIBCRYPT
-/* This is to have crypt() defined on Linux */
+/* This is to have crypt() and sched_setaffinity() defined on Linux */
 #define _GNU_SOURCE
 
+#ifdef USE_LIBCRYPT
 #ifdef USE_CRYPT_H
 /* some platforms such as Solaris need this */
 #include <crypt.h>
@@ -29,6 +29,9 @@
 #include <pwd.h>
 #include <grp.h>
 #include <errno.h>
+#ifdef USE_CPU_AFFINITY
+#include <sched.h>
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>