Re: Build Mesa with a different toolchain version

[Tobias Geerinckx-Rice]

Thiago Jung Bauermann 写道：
> (define gcc->gcc-10
>   (package-input-rewriting `((,gcc-7 . ,gcc-10)
>                              (,(make-libstdc++ gcc-7) 
>                              . ,(make-libstdc++ gcc-10)))))
>
> (define-public mesa-10
>   (package
>     (inherit (gcc->gcc-10 mesa))
>     (name "mesa-10")))
> ```
>
> i.e., the only change relative to the previous try was to look 
> for ‘gcc-7’
> rather than ‘gcc’ to make the substitution.

This might be because GCC & friends are implicit inputs brought in 
through the build system, not listed by the package itself.

Kind regards,

T G-R

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