Date: Thu, 6 Jul 2000 10:27:21 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: "Tim \"Zastai\" Van Holder" <zastai AT hotmail DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: Possible make breakage
In-Reply-To: <3uO85.30140$ko1.653025@afrodite.telenet-ops.be>
Message-ID: <Pine.SUN.3.91.1000706102703.23332L-100000@is>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Reply-To: djgpp AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: djgpp AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk


On Wed, 5 Jul 2000, Tim "Zastai" Van Holder wrote:

> > You need to put "SHELL = /bin/sh" somewhere in the Makefile, and then
> > Make will Do The Right Thing.
> Apparently, not all the time... In automake 1.4a, a script (depcomp) is used
> to generate dependencies while also compiling the relevant file; it gets
> invoked like this:
> 
> .c.o:
>     source='$<' object='$@' libtool=no \
>     depfile='$(DEPDIR)/$*.Po' tmpdepfile='$(DEPDIR)/$*.TPo' \
>     $(CCDEPMODE) $(depcomp) \
>     $(COMPILE) -c -o $@ `test -f $< || echo '$(srcdir)/'`$<
> 
> with depcomp = $(SHELL) $(srcdir)/depcomp
> 
> With the DJGPP port of make, this does not work (the script never sees the
> variables).

Does Make invoke Bash to run this command?  If it does, Make works
correctly: all Make is responsible to do in this case is (a) to detect
that this command requires a shell, and (b) to invoke Bash given the
"SHELL = /bin/sh" line.  Anything else is up to Bash and the commands
it invokes.

> As a workaround in my port (still under development, although I
> may release it soon), I enclosed the entire statement in $(SHELL) -c
> "<statement here>". This did work (although makefiles using quotes in their
> compilation switches now need patching). I'm at a loss as to why this is; if
> the same method of invocation is used in a script in bash, it works fine.

You will need some more digging to find out what happens inside that
rule.  Trying a simpler command or a different shell script instead of
depcomp might shed some light.

I vaguely remember that someone reported a similar problem on
djgpp-workers a few months ago, so you might search the mail-archives
URL at DJ's server.  IIRC, the conclusion in that thread was that it
is some strange problem in Bash, although I don't think I've seen a
definitive analysis.

> So my guess is that it's somehow make's fault.

Any facts to back up this guess? ;-)