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Re: cmake-build-system: modify-phases picks up wrong %standard-phases

From: Ludovic Courtès
Subject: Re: cmake-build-system: modify-phases picks up wrong %standard-phases
Date: Mon, 20 Jan 2020 10:18:01 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Hi Hartmut,

Hartmut Goebel <address@hidden> skribis:

> I experience a strange problem: The package below (stripped down to show
> the issue) uses the `qt-build-system`.
> When running as shown, the build fails, since the `configure` phase is
> taken from gnu-build-system.
> It works fine, when modifying `(@ (guix build cmake-build-system)
> %standard-phases)` instad of just %standard-phases` but - as prepared in
> the line above.
> It also works fine when not setting `#:modules`. (Setting `#:modules` is
> required since in the real package definition some phase uses
> `get-string-all` from (ice-9 textual-ports), which needs to be added to
> `#:modules`).
> What might cause this issue?


>   (build-system cmake-build-system)
>   (arguments
>    `(;;#:modules (,@%cmake-build-system-modules)

The problem stems from a confusion between “imported modules” and
“modules in scope” (don’t worry, you’re not the first one to be tripped
up by this!).

‘%cmake-build-system-modules’ and similarly-named variables contain the
closure of the modules to be _imported_ on the build side for
‘cmake-build-system’ to work.

However, the modules that you want _in scope_ are only those used as the
default value of #:modules in ‘cmake-build’, namely:

  ((guix build cmake-build-system)
   (guix build utils))

If you do:

  #:modules ,%cmake-build-system-modules

then you’re also putting (guix build gnu-build-system) in scope, hence
the collision for the ‘%standard-phases’ binding.



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