Re: [PATCH 0/7] minmax: reduce compilation time

Lorenzo Stoakes
2024-07-28T18:44:47Z

On Sun, Jul 28, 2024 at 07:57:11PM GMT, Geert Uytterhoeven wrote:
> Hi Lorenzo,
>
> On Fri, Jul 26, 2024 at 8:57 PM Lorenzo Stoakes
> <lorenzo.stoakes@oracle.com> wrote:
> > On Fri, Jul 26, 2024 at 11:24:09AM GMT, Linus Torvalds wrote:
> > > On Fri, 26 Jul 2024 at 11:13, Lorenzo Stoakes
> > > <lorenzo.stoakes@oracle.com> wrote:
> > > >
> > > > 5,447,539 ./arch/x86/xen/setup.o.pre
> > >
> > > Can you perhaps do some kind of "max expansion" on all the
> > > preprocessor files (you seem to have done it by changing the ".c.o"
> > > rule to just spit it out as "o.pre", which sounds fine).
> >
> > Yeah I simply hacked in a gcc -E, ugly but effective, e.g. prepending
> > cmd_cc_o_c in scripts/Makefile.build with:
> >
> > cmd_cc_o_c = $(CC) $(c_flags) -E $< > $@.pre; \
>
> Kbuild already knows how to build a preprocessed file (.i),
> so making any .o depend on its .i should work, too?
>
> Or am I missing something?

Yup I'm sure putting something in like that would work, I wasn't aware of
the whole .i thing when I did this and I just hacked something in quick +
dirty to get the data.

>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds