linux-kernel - Re: [PATCH v2] checkpatch: kbuild: if_changed: check for multiple calls in targets

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Message-ID: <20180720154449.GC16221@gate.crashing.org>
Date:   Fri, 20 Jul 2018 10:44:49 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Dirk Gouders <dirk@...ders.net>,
        Andy Whitcroft <apw@...onical.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] checkpatch: kbuild: if_changed: check for multiple calls in targets

On Fri, Jul 20, 2018 at 08:33:56AM -0700, Joe Perches wrote:
> On Fri, 2018-07-20 at 10:21 -0500, Segher Boessenkool wrote:
> > On Fri, Jul 20, 2018 at 03:06:37AM -0700, Joe Perches wrote:
> > > On Fri, 2018-07-20 at 09:48 +0200, Dirk Gouders wrote:
> > > > +		# Check for multiple calls of if_changed within a target in Makefiles
> > > > +		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
> > > 
> > > The uses of .* here are superfluous.
> > 
> > And it looks like you wanted to match this only at the beginning of the
> > string, which would be /^Makefile/ etc.
> 
> Nope.
> 
> $realfile includes path and /^Makefile/ matches only the
> top level Makefile and none of the ones in subdirectories.

Then the .* is more mysterious :-)

(Maybe the script should use File::Basename).


Segher