[Bug libstdc++/123908] [16 regression] Undefined reference to std::__get_once_call()

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123908

--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, that's the problem, and this is the fix:

--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -2586,6 +2586,11 @@ GLIBCXX_3.4.35 {
     _ZNSt12__cow_stringaSERKS_;
     _ZNSt12__cow_stringaSEOS_;
     _ZNKSt12__cow_string5c_strEv;
+
+    # Symbols for *-*-mingw* std::call_once impl
+    _ZSt19__get_once_callablev;
+    _ZSt15__get_once_callv;
+
 } GLIBCXX_3.4.34;

 # Symbols in the support library (libsupc++) have their own tag.