Re: gcc-15/16 compiling the std module and the --with-default-libstdcxx-abi compiler flag

On Mon, 17 Nov 2025 at 14:12, John Fourkiotis via Gcc-help
<[email protected]> wrote:
>
> Hi,
>
> I tried to compile the std module using the latest gcc sources, by using :
>
> g++ -std=c++23 -fmodules -fsearch-include-path -c bits/std.cc
>
> and it worked OK. I've tried to compile some simple programs with it, and
> it worked as expected.
>
> However, when I build the compiler with the option
>
> --with-default-libstdcxx-abi = gcc4-compatible
>
> The std module failed with various compiler errors. I guess this is
> something to be expected, but I would like to ask if it is also something
> that may be "fixed" in the future or not.


It's a bug, and so if somebody reports it, it's likely to be fixed,
and if nobody reports it, then it's unlikely to be fixed.

See https://gcc.gnu.org/bugs/ for more info on reporting, thanks!