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

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Message-ID: <CAMuHMdXCuF4ikx7uR_fG=EAPOf+1T0JoHTMOyqfS6eUcvS-piw@mail.gmail.com>
Date: Sun, 28 Jul 2024 19:57:11 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Linus Torvalds <torvalds@...uxfoundation.org>, David Laight <David.Laight@...lab.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"Matthew Wilcox (Oracle)" <willy@...radead.org>, Christoph Hellwig <hch@...radead.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Arnd Bergmann <arnd@...nel.org>, 
	"Jason@...c4.com" <Jason@...c4.com>, "pedro.falcato@...il.com" <pedro.falcato@...il.com>, 
	Mateusz Guzik <mjguzik@...il.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/7] minmax: reduce compilation time

Hi Lorenzo,

On Fri, Jul 26, 2024 at 8:57 PM Lorenzo Stoakes
<lorenzo.stoakes@...cle.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@...cle.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 $< > $@...e; \

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?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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