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Re: Build Mesa with a different toolchain version

From: Thiago Jung Bauermann
Subject: Re: Build Mesa with a different toolchain version
Date: Tue, 01 Jun 2021 22:53:54 -0300

After sending the email, I thought of another thing to try, but it didn't
help. I thought I'd mention it here for completeness:

Try #3:

Using this definition in my local channel:

(define gcc->gcc-10
  (package-input-rewriting `((,gcc-7 . ,gcc-10)
                             (,(make-libstdc++ gcc-7) . ,(make-libstdc++ 

(define-public mesa-10
    (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.

But unfortunately guix build didn't even try to rebuild the package.
It just returned the store items that were built in try #2:

$ guix build --system=i686-linux mesa-10

I believe this shows that ‘gcc’ already points to ‘gcc-7’. I just can't
change it for some reason…


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