Subject: Re: Missing inversion in Makefile (ee9be06)

From: Johannes Sixt <[email-masked]>
Date: Sat, 27 Dec 2014 20:07:01 +0100

Am 27.12.2014 um 19:49 schrieb Philip Oakley:
> 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#L2097

The 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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