Re: turning off dependency tracking when building fat binaries on Mac OSX

[Peter Johansson]

Hi Ralf,

On 2/13/11 3:32 AM, Ralf Wildenhues wrote:
> Yep.  I think that was one reason we explicitly documented the thing in
> INSTALL.  With this configuration, your preprocessor will be wrong
> (because CFLAGS are not passed to it) which means macro values may be
> computed wrongly.
I'm not sure I understand what you mean here.

Do you suggest there is a difference between

./configure CFLAGS="-arch i386 -arch x86_64" LDFLAGS="-arch i386 -arch 
x86_64"

and

./configure CC="-arch i386 -arch x86_64" CPP="gcc -E"

Can you please explain. AFAICS, in both cases compilation and linking 
will occur with multiple archs but preprocessing will occur with a 
simple "gcc -E"
> That doesn't mean we should break automake dependency tracking in this
> configuration, but it does mean you shouldn't do it when it hurts.  ;-)
Sorry, but this is probably too many negations for me. Can you please 
explain.

> > You need to explicitly turn off dependency tracking. My question is
> > simply is there a good reason why automake does not turn off the
> > dependency tracking automagically in this case, or should I consider
> > it a missing feature.
> I suppose I'll accept a patch that enhances automake/m4/depend.m4 to
> address this.  Are you motivated?

Yes, I'm motivated. I've got some more time for free software so I think 
I could whip up a quick patch with the behavior I expect...

Cheers,
Peter