Marius Bakke <mbakke@fastmail.com> writes:

>>> +  (let ((commit "c4de15df559410aff0ca6643724e24cddb0ecbbd")
>>> +        (arch (match (or (%current-target-system)
>>> +                         (%current-system))
>>> +                ("x86_64-linux" "x86_64")
>>> +                ("i686-linux" "i386")
>>> +                (_ ""))))
>>> Don't do this if you just need to determine architecture at build time.
>>
>> Just to be sure, you suggest moving this inside the 'really-install
>> phase, right?
>
> Yes.  Otherwise it gets needlessly evaluated by the Guix "front-end"
> every time one uses 'guix search' etc -- even on unsupported
> architectures.  It's better to do it at build time, especially when it
> is only used within a single phase.

I don't understand the difference.

(match (or (%current-target-system)
           (%current-system))
   ("x86_64-linux" "x86_64")
   ("i686-linux" "i386"))

must be unquoted inside the phase, so it's evaluated when the package
is and not at build time, isn't it?
Else how do you match against the build architecture at build time?

-- 
Pierre Neidhardt
https://ambrevar.xyz/