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

[martin at martin dot st via Gcc-bugs]

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

--- Comment #22 from Martin Storsjö <martin at martin dot st> ---
(In reply to Jonathan Wakely from comment #19)
> 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.

Thanks; I can confirm that this fixes the issue.