Re: Missing inversion in Makefile (ee9be06)
- From
Johannes Sixt <j6t@kdbg.org>
- Date
- Dec 27, 2014, 19:07 UTC
- Message-ID
- <549F0355.5020805@kdbg.org>
- In-Reply-To
- <E3DB9AD2A8914C379FB3371494B0B816@PhilipOakley>
Am 27.12.2014 um 19:49 schrieb Philip Oakley:
Show 22 quoted lines
> Hi,
>
> In ee9be06 (perl: detect new files in MakeMaker builds, 2012-07-27)
> there is a step to detect if there has been an update to the PM.* files,
> however it appears that the logic is inverted in the comparison.
>
> I need some extra eye's on this to be sure I have it right (I'm trying
> to debug an old Windows breakage...).
>
> The resultant output of a make dry run included (on my m/c)..:
>
> find perl -type f -name '*.pm' | sort >perl/PM.stamp+ && \
> { cmp perl/PM.stamp+ perl/PM.stamp >/dev/null 2>/dev/null || mv
> perl/PM.stamp+ perl/PM.stamp; } && \
> rm -f perl/PM.stamp+
> make -C perl PERL_PATH='/usr/bin/perl' prefix='/c/Documents and
> Settings/Philip' perl.mak
>
> Shouldn't it be `{ ! cmp ` so that when the files are not identical, the
> move is performed?
>
> https://github.com/git/git/blob/ee9be06770223238c6a22430eb874754dd22dfb0/Makefile#L2097The existing code looks correct to me. cmp succeeds when the files are identical and fails when they are different: When it succeeds (files are equal), the mv is not executed. When it fails, either because a file does not exist or they are different, the mv is executed.
-- Hannes
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