Re: x-files must die: generate *config.h from the Makefile, etc

[Geoff Keating <geoffk at geoffk dot org>]

"Zack Weinberg" <zackw@Stanford.EDU> writes:

> On Wed, Mar 07, 2001 at 12:55:49PM -0500, DJ Delorie wrote:
> > 
> > It looks OK at first glance, but I'd like to see it tested for
> > multi-threaded builds.  Please try it with "make -j4 bootstrap" (and
> > at least make 3.79); you don't need a multi-cpu machine to do that.
> 
> In the original message, I said I'd done that already (yes, with make
> 3.79).  But I have seen this test succeed on a uniprocessor and fail
> on an N-way machine.
> 
> > I'm also concerned that now any trivial change in target header file
> > will cause everything to be rebuilt, when often only a few files need
> > rebuilding.  Since this was intentional before, people will complain
> > if it's changed.
> 
> I suppose I could make the object files depend on *config.h but not
> the files they include.  That would mimic the old behavior.  Thing is,
> how do you tell which few files need to be rebuilt?  Every time I've
> tried to guess, I've got it wrong.  And every so often someone gets
> bit by this.  I'd rather make the dependencies formally correct, and
> people who like the old way can edit the Makefile.

I agree.  You could also use 'make -t' if you really think that only a
few files need to be rebuilt.

-- 
- Geoffrey Keating <geoffk@geoffk.org>