[Bug libstdc++/87618] [9 Regression] Missing symbol for std::__cxx11::basic_stringbuf, std::allocator >::basic_stringbuf()

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87618

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> I made a typo in the linker script:
> 
> --- a/libstdc++-v3/config/abi/pre/gnu.ver
> +++ b/libstdc++-v3/config/abi/pre/gnu.ver
> @@ -2035,7 +2035,7 @@ GLIBCXX_3.4.26 {
>      _ZNSt15basic_stringbuf[cw]St11char_traitsI[cw]ESaI[cw]EEC[12]Ev;

^^ And here too.

The tests for these functions are built with -O2 and so the constructor is
inlined and we didn't notice the definition isn't exported. Ouch.