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Date:      Fri, 23 Oct 2015 08:25:51 -0600
From:      Ian Lepore <ian@freebsd.org>
To:        Bryan Drewery <bdrewery@FreeBSD.org>
Cc:        "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>
Subject:   Re: svn commit: r289778 - head/share/mk
Message-ID:  <1445610351.91534.1.camel@freebsd.org>
In-Reply-To: <6847681E-3E85-40B9-BF9D-2FF4C6DE4AC9@FreeBSD.org>
References:  <201510222341.t9MNfuNK007465@repo.freebsd.org> <1445558386.14963.38.camel@freebsd.org> <232D9171-D360-4110-8682-6B371D9F9CAC@FreeBSD.org> <6847681E-3E85-40B9-BF9D-2FF4C6DE4AC9@FreeBSD.org>

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On Thu, 2015-10-22 at 17:21 -0700, Bryan Drewery wrote:
> > On Oct 22, 2015, at 17:18, Bryan Drewery <bdrewery@FreeBSD.org>
> > wrote:
> > 
> > 
> > 
> > > > On Oct 22, 2015, at 16:59, Ian Lepore <ian@freebsd.org> wrote:
> > > > 
> > > > On Thu, 2015-10-22 at 23:41 +0000, Bryan Drewery wrote:
> > > > Author: bdrewery
> > > > Date: Thu Oct 22 23:41:56 2015
> > > > New Revision: 289778
> > > > URL: https://svnweb.freebsd.org/changeset/base/289778
> > > > 
> > > > Log:
> > > > For SUBDIR_PARALLEL, when doing 'make clean*' or 'make obj'
> > > > there
> > > > is no need to
> > > > respect SUBDIR_DEPEND_* or .WAIT.
> > > > 
> > > > MFC after:    2 weeks
> > > > Sponsored by:    EMC / Isilon Storage Division
> > > 
> > > This doesn't feel so safe.  People override these targets and do
> > > who
> > > -knows-what with them.  The clean* seems especially risky since
> > > it will
> > > match targets in end-user makefiles that you don't even know
> > > about.
> 
> I can also not apply to SUBDIR_TARGETS which is the user-defined
> targets list. (Misspelled and should be LOCAL_SUBDIR_TARGETS)
> 

That might be a good idea.  When I grepped our devel/mk directory,
SUBDIR_TARGETS was where I saw a number of things that would match
clean* (I didn't look into exactly what they do).

-- Ian

> > > 
> > > -- Ian
> > 
> > I can limit it to src tree builds if you want.
> > 
> > I cannot imagine any situation where "clean<something>" depends on
> > another directory going first. 
> > 
> > Similarly it makes sense to always build subdirs in parallel with
> > 'obj' and I would argue 'clean*' too, regardless of
> > SUBDIR_PARALLEL. I only just realized that. Yes there are mkdir -p
> > and rm -f races, but we have not added any dependencies because of
> > these as is.
> 
> 



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