From: Willy Tarreau <w@1wt.eu>
Date: Wed, 15 Sep 2021 08:12:04 +0000 (+0200)
Subject: BUILD: threads: fix -Wundef for _POSIX_PRIORITY_SCHEDULING on libmusl
X-Git-Tag: v2.5-dev8~198
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8ab941939480af65660182e343df22fcdced6005;p=thirdparty%2Fhaproxy.git

BUILD: threads: fix -Wundef for _POSIX_PRIORITY_SCHEDULING on libmusl

Building with an old musl-based toolchain reported this warning:

  include/haproxy/thread.h: In function 'ha_thread_relax':
  include/haproxy/thread.h:256:5: warning: "_POSIX_PRIORITY_SCHEDULING" is not defined [-Wundef]
   #if _POSIX_PRIORITY_SCHEDULING
       ^

There were indeed two "#if" insteadd of #ifdef" for this macro, let's
fix them.
---

diff --git a/include/haproxy/thread.h b/include/haproxy/thread.h
index 51c7278489..9cf66476c3 100644
--- a/include/haproxy/thread.h
+++ b/include/haproxy/thread.h
@@ -103,7 +103,7 @@ static inline unsigned long long ha_get_pthread_id(unsigned int thr)
 
 static inline void ha_thread_relax(void)
 {
-#if _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_PRIORITY_SCHEDULING
 	sched_yield();
 #endif
 }
@@ -253,7 +253,7 @@ static inline unsigned long long ha_get_pthread_id(unsigned int thr)
 
 static inline void ha_thread_relax(void)
 {
-#if _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_PRIORITY_SCHEDULING
 	sched_yield();
 #else
 	pl_cpu_relax();