[PATCH] libstdc++/112351 - deal with __gthread_once failure during locale init

[Richard Biener <rguenther@suse.de>]

The following makes the C++98 locale init path follow the way the
C++11 performs initialization.  This way we deal with pthread_once
failing, falling back to non-threadsafe initialization which, given we
initialize from the library, should be serialized by the dynamic
loader already.

Bootstrapped and tested on x86_64-unknown-linux-gnu, OK for trunk?
And GCC 13 branch?

Thanks,
Richard.

	PR libstdc++/112351
libstdc++-v3/
	* src/c++98/locale.cc (locale::facet::_S_get_c_locale):
	Always perform non-threadsafe init when threadsafe init
	failed.
---
 libstdc++-v3/src/c++98/locale.cc | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/libstdc++-v3/src/c++98/locale.cc b/libstdc++-v3/src/c++98/locale.cc
index d308140bab7..e9bec1db3b6 100644
--- a/libstdc++-v3/src/c++98/locale.cc
+++ b/libstdc++-v3/src/c++98/locale.cc
@@ -216,12 +216,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #ifdef __GTHREADS
     if (__gthread_active_p())
       __gthread_once(&_S_once, _S_initialize_once);
-    else
 #endif
-      {
-	if (!_S_c_locale)
-	  _S_initialize_once();
-      }
+    if (__builtin_expect (!_S_c_locale, 0))
+      _S_initialize_once();
     return _S_c_locale;
   }
 
-- 
2.35.3