Maxim Cournoyer <maxim.cournoyer@gmail.com> skriver:

> This reinstates glibc 2.22 through 2.28, by reverting commit
> ebd1ba713cbefc9ad5dac609255e1344a328e360 ("gnu: glibc: Remove old versions."),
> adding two patches removed in d2bb4847b96e51b71126778bb16daa7674a6690c ("gnu:
> Remove leftover patch files."), and partially reverting
> 1feca4be5296d7f0c0e2269ccb612cadded6573b ("gnu: glibc: Remove versions 2.27
> and 2.28.").
>
> Rationale: Keeping older glibc versions around is useful when experimenting
> with 'package-with-c-toolchain'.

IMO it's better to add these to 'guix-past'[0] instead of keeping them
in the main channel.

[0]: https://gitlab.inria.fr/guix-hpc/guix-past