Re: modifying (rather than fully replacing) a build phases

[John Kehayias]

My question remains, but I've updated the patch in question to use
#:make-flags (thanks to mirai for the idea), separating out these
parameters from the build command and making this a much easier
change.

Still, we have examples of just copying some phase by hand to make
adjustments, is there anything better we can/should do?

On Tue, Jun 27, 2023 at 12:29 PM, John Kehayias wrote:

> Hi Guixers,
>
> A question that is either relatively simple or else getting into the
> weeds a bit, that I came across in my proposed patch
> <https://issues.guix.gnu.org/64213> The general question is: how can I
> modify a build phase without replacing it completely? More
> specifically (as seen in the proposed patch) there is a build phase
> consisting of just an "apply invoke" call where I want to remove one
> of the arguments given. Is there a simple way to do this rather than
> just manually copying and deleting that string?
>
> I would assume so, but I wasn't sure how to do it and couldn't quite
> grep any examples. Some light exploring in the guix repl shows me that
> package-arguments is a keyword list (not sure the proper terminology
> in Guile) with #:phases a big gexp. Essentially I want to modify that
> to remove a string. I suppose it is a question of manipulating a gexp
> directly. (I'm sure macros can do all this but there doesn't seem to
> be a need for that at this level, right?)
>
> Thanks in advance!
> John