From be6dad0edf123fc5cf953c248ca02cfcd7592094 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 11 Feb 2026 13:05:18 +0000
Subject: [PATCH] libstdc++: Add missing exports for std::call_once on Windows
 [PR123908]

libstdc++-v3/ChangeLog:

	PR libstdc++/123908
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.35): Add exports for
	std::__get_once_callable and std::__get_once_call.
---
 libstdc++-v3/config/abi/pre/gnu.ver | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver
index fb78782eaf6..fb968e122d8 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -2586,6 +2586,12 @@ GLIBCXX_3.4.35 {
     _ZNSt12__cow_stringaSERKS_;
     _ZNSt12__cow_stringaSEOS_;
     _ZNKSt12__cow_string5c_strEv;
+
+#if defined (_WIN32) && !defined (__CYGWIN__)
+    _ZSt19__get_once_callablev;
+    _ZSt15__get_once_callv;
+#endif
+
 } GLIBCXX_3.4.34;
 
 # Symbols in the support library (libsupc++) have their own tag.