Re: [Qemu-devel] How to split vl.h

[Thiemo Seufer <ths@networkno.de>]

Blue Swirl wrote:
> On 11/1/07, Fabrice Bellard <fabrice@bellard.org> wrote:
> > Blue Swirl wrote:
> > > Hi,
> > >
> > > With the automatic dependency rule installed, modifying vl.h causes
> > > all files to be recompiled. This is of course the correct action, but
> > > it's a major slowdown for development too.
> >
> > There must be an option in the Makefile to disable the automatic
> > dependency check.
> >
> > > How should we split vl.h into smaller pieces? Give each device a
> > > header file, like m48t59? What about other stuff exported from vl.c?
> >
> > The net result is that you will have dozens of header files with only
> > one line in them as most devices only export one function.
> 
> I have another solution: include all architecture specific files from
> the main file. This actually makes the compilation faster and the
> resulting binary is smaller (maybe faster).

I it a solution? You always end up with the worst case of recompiling
everything now.

> Changing the architecture
> specific code needs no changes to vl.h, just a recompile of sun4m.c,
> but this is instantaneous on my machine. Automatic dependencies also
> handle this case. I guess some may find this style pretty ugly.

It is ugly. You basically re-invented gcc's -combine option but
without avoiding the namespace problem of a single file scope.



Thiemo