[Bug libstdc++/115907] Libstdc++ and GCC itself should avoid glibc above 2.34 dependency

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115907

--- Comment #32 from cqwrteur <unlvsur at live dot com> ---
(In reply to cqwrteur from comment #31)
> > Why not?  It has to pull libraries and headers from somewhere (note that I
> > do not know what "crossback" means).
> > 
> > Note that there is desire to not predefine _GNU_SOURCE in C++ modes.  See
> > the PRs Andrew referenced.
> 
> 
> https://github.com/trcrsired/gcc-releases/releases
> 
> This one
> x86_64-pc-linux-gnu.tar.xz in 20240707-x86_64-w64-mingw32
> 
> The compiler builds on arch linux. runs on windows. produces binaries works
> on linux again. This is crossback compilation.

https://github.com/trcrsired/toolchainbuildscripts/blob/a9eb4dbddde50e8993abde895d2d70c3e36dba79/gccbuild/x86_64-w64-mingw32/x86_64-linux-gnu-crossback.sh#L49

https://github.com/trcrsired/toolchainbuildscripts/blob/a9eb4dbddde50e8993abde895d2d70c3e36dba79/gccbuild/x86_64-w64-mingw32/x86_64-linux-gnu-crossback.sh#L202C209-L202C224

In fact the abi situation is so bad i have to ship windows GCC to build linux
programs.