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Re: Large project support

From: Richard Boulton
Subject: Re: Large project support
Date: 10 Apr 2002 19:00:44 +0100

On Wed, 2002-04-10 at 18:26, Tom Tromey wrote:
> Also wildcards wouldn't interact well with some automake features.
> That's because we need to do certain things statically to work around
> problems and missing features in vendor makes.
> As an example suppose you want to use per-executable CFLAGS.  This
> feature won't work with wildcards since we must generate an explicit
> rule for each .o in the executable.  With wildcards there is no way to
> know when we need to regenerate the Makefile (we could do it every
> time, but first that would be horrible and people would complain, and
> second it only works with GNU make anyway).

Surely one thing we could do is to implement wildcards that are
evaluated at the time that automake is run.

This would be portable, since automake would be doing the work, and
Perhaps the best way to do this would be to add support for the
$(wildcard PATTERN...) function in automake variables, which would
evaluate the PATTERN against the source directory, and expand to the
names of all the matching files.  Or perhaps call it $(amwildcard ...)
to avoid breaking existing Makefile.ams which use this (and depend on
GNU make).

It is still true that it would be impossible to ensure that the is regenerated when a new source file is added, but I would
imagine it is rare to add a new source file to a project without
modifying any of the existing source files.

I think this would be a worthwhile addition: if I ever get time to
implement $(patsubst ) and other functions, I shall try implementing
this one too.


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