From: Matheus Castanho <msc@linux.ibm.com>
Date: Fri, 9 Jul 2021 14:13:38 +0000 (+0100)
Subject: libstdc++: Only use __gthread_yield if gthreads is available
X-Git-Tag: basepoints/gcc-13~6093
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e345e4ad6bb6595a9e3b182aa349d4f306b0921;p=thirdparty%2Fgcc.git

libstdc++: Only use __gthread_yield if gthreads is available

libstdc++-v3/ChangeLog:

	* include/std/mutex (__lock_impl): Check
	_GLIBCXX_HAS_GTHREADS before using __gthread_yield.
---

diff --git a/libstdc++-v3/include/std/mutex b/libstdc++-v3/include/std/mutex
index eeb51fdb840e..7ab4ee126905 100644
--- a/libstdc++-v3/include/std/mutex
+++ b/libstdc++-v3/include/std/mutex
@@ -618,7 +618,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 		      return;
 		    }
 		}
-#ifdef _GLIBCXX_USE_SCHED_YIELD
+#if defined _GLIBCXX_HAS_GTHREADS && defined _GLIBCXX_USE_SCHED_YIELD
 		__gthread_yield();
 #endif
 		constexpr auto __n = 1 + sizeof...(_L1);