GNU bug report logs - #31974
If a phase returns #f, a warning is issued, but the build continues

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From: ludo <at> gnu.org (Ludovic Courtès)
To: Mark H Weaver <mhw <at> netris.org>
Cc: 31974 <at> debbugs.gnu.org
Subject: bug#31974: If a phase returns #f, a warning is issued, but the build continues
Date: Sun, 19 Aug 2018 15:53:03 +0200

Mark H Weaver <mhw <at> netris.org> skribis:

> Mark H Weaver <mhw <at> netris.org> writes:
>
>> I just noticed that I made a mistake in commit
>> d8a3b1b9e847d4a44d2695f95af77170d4d2788f, which changed 'gnu-build' in
>> (guix build gnu-build-system) to issue a warning if a phase returns a
>> value other than #t.
>>
>> The result is that if a phase returns a value other than #t, a warning
>> is issued, but the build nonetheless continues to the next phase, and
>> the build could ultimately "succeed" even some phases returned #f.
>>
>> In other words, the return values of phases are effectively ignored,
>> except for the warning, so the only way to cause a build with phases to
>> fail is to raise an exception.
>
> This should be fixed by commit 82230603ce06de7aa3e4aef2fa093a6dbf0ef8df
> in core-updates.

Cool, thanks for not forgetting!  :-)

Ludo’.

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