Two notes after a calming walk in the woods:

Tobias Geerinckx-Rice 写道:
no package has a ‘gcc-toolchain’ input.

Not true: 2 do. I meant that ‘the toolchain’ used to build everything…

It is not used internally by Guix.

…is not the "gcc-toolchain" package as such.

(package (inherit gcc->gcc-10 mesa) …)

Just turn it around:

 (define-public mesa/gcc-10
   (package
     (inherit mesa)
     (native-inputs
       `(("gcc" ,gcc-10)
         ,@(package-native-inputs mesa)))))

Kind regards,

T G-R

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