doc: Mention how to remedy "source file ... newer than compiled error".

* doc/contributing.texi (Running Guix Before It Is Installed): Mention
how to remedy "source file ... newer than compiled" error by running
`make -j`.

Co-authored-by: jgart <jgart@dismail.de>
Co-authored-by: Julien Lepiller <julien@lepiller.eu>
Co-authored-by: Ryan Prior <rprior@protonmail.com>
Co-authored-by: Blake Shaw <blake@nonconstructivism.com>
Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>
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Guix Together 2021-12-16 01:46:50 -05:00 committed by Nicolas Goaziou
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@ -243,6 +243,24 @@ local source tree; it simply updates the @file{~/.config/guix/current}
symlink (@pxref{Invoking guix pull}). Run @command{git pull} instead if
you want to upgrade your local source tree.
Sometimes, especially if you have recently updated your repository,
running @command{./pre-inst-env} will print a message similar to the
following example:
@example
;;; note: source file /home/user/projects/guix/guix/progress.scm
;;; newer than compiled /home/user/projects/guix/guix/progress.go
@end example
This is only a note and you can safely ignore it. You can get rid of
the message by running @command{make -j4}. Until you do, Guile will run
slightly slower because it will interpret the code instead of using
prepared Guile object (@file{.go}) files.
You can run @command{make} automatically as you work using
@command{watchexec} from the @code{watchexec} package. For example,
to build again each time you update a package file, you can run
@samp{watchexec -w gnu/packages make -j4}.
@node The Perfect Setup
@section The Perfect Setup