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Re: Guix supported-systems option

From: phodina
Subject: Re: Guix supported-systems option
Date: Sat, 14 Jan 2023 22:01:49 +0000

Hi Julien,

> I think you have multiple packages with the same name and version, but 
> different supported systems. Am I right?

you are correct. I have multiple package definitions as shown in the attached 
scheme file.

The names and versions are exactly the same, just the origin differs and Guix 
picks "randomly" one of them.

I did as you suggested to rename the packages - append the arch. This works in 
short term but I'd like to have one profile and just apply it on my laptop 
(x86_64) as well as on Raspberry Pi (aarch64, recently added to Guix by Stefan).

Having different names will then not work or results in even bigger mess with 
if statements.

> Now, supported-systems does not mean "remove this package on other 
> architectures", but rather "can't build this on other architectures". So it's 
> perfectly possible that guix will arbitrarily select a package for a 
> different architecture.

Well this is the reason I ask. I though this has deeper meaning as to tell 
Guix, okay you found a package with that name, but it's not for current 
architecture. So keep looking and if you don't find any other return this one 
with a warning that it's not supported.

So the "right" way would be conditionally select the right origin for the 
package and use just one package definition with list of supported systems, 


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