Janneke Nieuwenhuizen <janneke@gnu.org> skribis:

> +++ b/gnu/packages/commencement.scm
> @@ -3643,10 +3643,12 @@ (define-public gcc-toolchain-14
>  ;; The default GCC
>  (define (current-gcc-toolchain)
>    "The current default gcc-toolchain version."
> -  gcc-toolchain-11)
> +  (if (target-hurd64?)
> +      gcc-toolchain-14
> +      gcc-toolchain-11))

[...]

> +++ b/gnu/packages/gcc.scm
> @@ -861,10 +861,12 @@ (define-public gcc-14
>  ;;       the gcc-toolchain-* definitions.
>  (define (current-gcc)
>    "The current default gcc version."
> -  gcc-11)
> +  (if (target-hurd64?)
> +      gcc-14
> +      gcc-11))

This affects not just cross-compilation but also native compilation.

Let’s assume we only want cross-compilation to x86_64-gnu for now, how
about changing the GCC version used for cross-compilation, and only
that: