Hi Leo,

Leo Nikkilä <hello@lnikki.la> skribis:

> After the "hack" introduced for <https://issues.guix.gnu.org/42392>, all GCCs
> are built with the current GCC's libstdc++ headers. This results in subtly
> broken C++ headers in older versions, which aren't necessarily compatible with
> libstdc++s from other versions.

[...]

> * gnu/packages/gcc.scm (libstdc++, libstdc++-headers): Remove variables.
> (make-libstdc++-headers): New procedure.
> (gcc-6)[native-inputs]: Use it with `this-package'.
> ---
>  gnu/packages/gcc.scm | 38 ++++++++++++++++++--------------------
>  1 file changed, 18 insertions(+), 20 deletions(-)

Somehow this patch fell into the cracks.

I’ve now applied it with the change below (using ‘mlambdaq’ for
‘make-libstdc++-headers’); I also shortened the commit log.

Thanks!

Ludo’.