GNU bug report logs - #9372
24.0.50; missing header biditype.h

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Message #32 received at 9372 <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Glenn Morris <rgm <at> gnu.org>, Ivan Kanis <ivan.kanis <at> googlemail.com>,
	9372 <at> debbugs.gnu.org
Subject: Re: bug#9372: 24.0.50; missing header biditype.h
Date: Fri, 26 Aug 2011 07:39:59 +0200

Stefan Monnier skrev 2011-08-26 06:11:
>> timestamp newer than deps/bidi.d, the latter would be regenerated before
>> anything else happened. But maybe it doesn't work like that?
>
> No, it's the opposite: the bidi.d file from previous compilation
> (i.e. older) is used to guess whether bidi.c needs to be recompiled.
>
> Basically, the problem is that the bidi.d file should contain
> dependencies which say "if foo.c is newer than bidi.c, then recompile,
> but if foo.c doesn't exist any more, then just ignore this rule rather
> than foolishly trying to build foo.c".
> I don't know if GNU make provides such a kind of dependency (tho you
> can get it via ifeq trickery).
>

The problem is that make includes bidi.d.  So the rule would have to be
if bidi.d is older than bidi.c, don't include it.  I don't know if that is
possible.  Also, if foo.c don't exist anymore may be an error, for example
removed from the repository by mistake.

	Jan D.

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