From:	pjfarley3 AT escape DOT com (Peter J. Farley III)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: automake help needed
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Date:	Wed, 08 Aug 2001 00:28:29 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Tim Van Holder <tim DOT vanholder AT falconsoft DOT be> wrote:
<Snipped>
>Problem is that they're not functionally equivalent.
>Automake conditionals represent a configure-time decision; GNU make
>conditionals are a run-time decision.  The latter allows you to change
>make's behaviour by running
>
>  make CONDVAR=value
>
>but automake conditionals require a reconfigure to make such a change.

Exactly.

>I just ran a little test and it seems there is a way out: automake
>requires its conditionals to start in column 0, make doesnt.  So if
>you merely precede your if/else/endif by a single space, automake
>won't complain and the conditional will end up in the Makefile as
>intended.

Yes, Tom Tromey also answered me on this question over on the automake
mailing list.  I'll quote the relevant piece of the exchange here:

At 10:52 PM 8/6/01 -0600, Tom Tromey wrote:
>>>>>> "Peter" == Peter J Farley <pjfarley AT dorsai DOT org> writes:
>Peter> Does automake disallow using GNU make conditionals in rules?
>
>Not really, but they aren't supported either.  Sometimes they "work"
>if you indent them.  Try adding a leading space.

I was able to solve my immediate problem before I saw Tom's suggestion
by turning it into a make-time rule action shell test on the value of
the variable (which is actually an environment variable, not just a
local make variable, so a shell-based test was appropriate), so my
particular problem was not hard to work around.

Thanks for testing Tom's solution, it's good to know that it works for
the next time I need it.

----------------------------------------------------
Peter J. Farley III (pjfarley AT nospam DOT dorsai DOT org OR
                     pjfarley3 AT nospam DOT escape DOT com)

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