Re: [Gnu-arch-users] Build System links/ recommendations

[Jan Hudec]

On Fri, Sep 03, 2004 at 20:41:45 +0200, Jan Hudec wrote:
> On Fri, Sep 03, 2004 at 19:33:41 +0100, Andrew Suffield wrote:
> > On Fri, Sep 03, 2004 at 08:25:45PM +0200, Jan Hudec wrote:
> > > On Fri, Sep 03, 2004 at 16:37:47 +0100, Andrew Suffield wrote:
> > > > On Fri, Sep 03, 2004 at 05:16:43PM +0200, Jan Hudec wrote:
> > > > > $ cat ,test.mk 
> > > > > @foo : | @bar
> > > > >       touch @foo
> > > > > 
> > > > > @bar :
> > > > >       test -f @bar || touch @bar
> > > > > 
> > > > > .PHONY: @bar
> > > > > $ touch @foo
> > > > > $ make -f ,test.mk @foo
> > > > > test -f @bar || touch @bar
> > > > > $
> > > > > 
> > > > > This does not count either.
> > > > 
> > > > Why not? That's exactly what you asked for: go recurse to the makefile
> > > > that can make the test properly, but don't prejudice the rebuild
> > > > because we recursed.
> > > >
> > > > Obviously it makes no sense if you're not recursing.
> > > 
> > > Obviously, because if it did count, it would have to read:
> > > 
> > > test -f @bar || touch @bar
> > > touch @foo
> > > 
> > > Because I have *TOUCHED* @bar. And thus it *IS* newer than @foo and thus
> > > @foo *MUST* be remade -- but isn't.
> > 
> > Oh, you'll need a regular dependency as well for that. Just don't
> > supply a rule for it.
> 
> Ok. This seems to work:
> 
> @foo : | @bar
>       touch @foo
> 
> @foo : @bar
> 
> @bar :
>       test -f @bar || touch @bar
> 
> But well, now do you really consider this obvious? It takes a hell lot
> of reading the manual or asking stupid questions to make this work. And
> it should be quite common thing to do with recursive makefiles...

Um. Looking again, NO, IT DOES NOT WORK.
With .PHONY it updates @foo always, which it shouldn't.
Without .PHONY it does not invoke the @bar rule, so it's prerequisites
wouldn't be checked.

-------------------------------------------------------------------------------
                                                 Jan 'Bulb' Hudec 
<address@hidden>

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