From: Jonathan Wakely <jwakely@redhat.com>
Date: Tue, 22 Mar 2022 21:17:01 +0000 (+0000)
Subject: libstdc++: Disable atomic wait for freestanding [PR105021]
X-Git-Tag: basepoints/gcc-13~535
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5bf59b004808abf6acbfe5ef54a0f9216b8dce22;p=thirdparty%2Fgcc.git

libstdc++: Disable atomic wait for freestanding [PR105021]

We use either condition variables or futexes to implement atomic waits,
so we can't do it in freestanding. This is non-conforming, so should be
revisited later, probably by making freestanding atomic waiting
operations spin without ever blocking.

Reviewed-by: Thomas Rodgers <trodgers@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/105021
	* include/bits/atomic_base.h [!_GLIBCXX_HOSTED]: Do not include
	<bits/atomic_wait.h> for freestanding.
---

diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index d86766cf39b9..2cad8486c694 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -37,7 +37,7 @@
 #include <bits/atomic_lockfree_defines.h>
 #include <bits/move.h>
 
-#if __cplusplus > 201703L
+#if __cplusplus > 201703L && _GLIBCXX_HOSTED
 #include <bits/atomic_wait.h>
 #endif