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Re: Add support for generating HTML docs a` la PDF, etc., revision 2

From: Alexandre Duret-Lutz
Subject: Re: Add support for generating HTML docs a` la PDF, etc., revision 2
Date: Wed, 05 Mar 2003 00:22:37 +0100
User-agent: Gnus/5.090008 (Oort Gnus v0.08) Emacs/21.2 (i386-pc-linux-gnu)

>>> "Ralf" == Ralf Corsepius <address@hidden> writes:

 Ralf> Eg. I have one using this:

 Ralf> html:
 Ralf>         mkdir html

I think we face the same problem every time Automake introduces
a new target: collision with existing targets.  For instance
Automake 1.7 introduced `ctags', `ps', and `pdf', so now you
can't build any programs with these names.  Now you couldn't
build a program named `html' either.

As far as programs are concerned, PR/344 gives a workaround.
Simple rules like your `html:', seems easier to fix.  Richard
suggested a rewrite which is close to what Automake already does
when it has to create directory:

        @$(mkinstalldirs) sub
        @: > sub/$(am__dirstamp)

sub/foo.$(OBJEXT): sub/$(am__dirstamp) ...

(AFAICT, Automake proceeds this way so that the directory 
is created in `.' even if it already exists in `$(srcdir)'.)

Sure, having to revise one's on Automake upgrades is
a pain.  I don't really see what else we could do.  (Never
introducing new targets doesn't look like a solution to me.)  It
sounds like we ought have diagnostics to help the transition by
spotting such troublesome rules.  How would we catch these?
Right now the only thing I can think of is to add something
  -Woverride Warn when a user rule override an Automake rule

Any other idea?
Alexandre Duret-Lutz

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