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Re: automake -vs- huge projects

From: Alexandre Duret-Lutz
Subject: Re: automake -vs- huge projects
Date: Wed, 31 Dec 2003 01:39:35 +0100
User-agent: Gnus/5.1003 (Gnus v5.10.3) Emacs/21.3 (gnu/linux)

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

 Ralf> On Tue, 2003-12-16 at 17:49, Tom Tromey wrote:
 >> The problem is, automake generates an explicit rule for each
 >> compilation.  Our resulting is nearly 9 megabytes.  This
 >> is really much too large -- compare to 200K with automake 1.4.

 Ralf> For subdir-compilation/non-recursive Makefiles automake generates *2*
 Ralf> explicit rules (cygwin and n/cygwin) for each compilation. Folding these
 Ralf> two rules into one, alone would reduce the size of Makefiles using many
 Ralf> files by almost factor 2.

Hmmm.  What we'd need to merge are these:

        $(CC) -c -o $@ $<
        $(CC) -c -o $@ `$(CYGPATH_W) $<`

and these:

sub/foo.o: sub/foo.c
        $(CC) -c -o $@ `test -f 'sub/foo.c' || echo '$(srcdir)/'`sub/foo.c

sub/foo.obj: sub/foo.c
        $(CC) -c -o $@ `if test -f 'sub/foo.c'; then $(CYGPATH_W) 'sub/foo.c'; 
else $(CYGPATH_W) '$(srcdir)/sub/foo.c'; fi`

The extension is obviously not an issue, but how can we arrange the CYGPATH_W

I've thought about this:

        $(CC) -c -o $@ $(am__cpbegin)$<$(am__cpend)
sub/foo.$(OBJEXT): sub/foo.c
        src=`test -f 'sub/foo.c' || echo '$(srcdir)/'`sub/foo.c; \
        $(CC) -c -o $@ $(am__cpbegin)$$src$(am__cpend)

and then have 
  am__cpbegin = `cygpath -w '
  am__cpend   = '`
  am__cpbegin = '
  am__cpend   = '

but this is not really attractive.

A related question is why we need this `cygpath -w' stuff.
My understanding is that it is to turn special absolute
filenames such as /cygdrive/c/foo into c:\foo
(if this is true, then I think the first use of $(CYGPATH_W) in 
the sub/foo.obj rule is superfluous, since the file is relative)
so that compiler that do not understand cygwin filename can work.

Couldn't this be folded into a compiler wrapper script?
Alexandre Duret-Lutz

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