linux-kernel - Re: [PATCH kernel v2] powerpc/makefile: Do not redefine $(CPP) for preprocessor

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Date:   Fri, 14 May 2021 12:10:51 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Segher Boessenkool <segher@...nel.crashing.org>
Cc:     Alexey Kardashevskiy <aik@...abs.ru>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH kernel v2] powerpc/makefile: Do not redefine $(CPP) for preprocessor

On Wed, May 12, 2021 at 7:29 PM Segher Boessenkool
<segher@...nel.crashing.org> wrote:
>
> On Wed, May 12, 2021 at 01:48:53PM +1000, Alexey Kardashevskiy wrote:
> > >Oh!  I completely missed those few lines.  Sorry for that :-(
> >
> > Well, I probably should have made it a separate patch anyway, I'll
> > repost separately.
>
> Thanks.
>
> > >To compensate a bit:
> > >
> > >>It still puzzles me why we need -C
> > >>(preserve comments in the preprocessor output) flag here.
> > >
> > >It is so that a human can look at the output and read it.  Comments are
> > >very significant to human readers :-)
> >
> > I seriously doubt anyone ever read those :)
>
> I am pretty sure whoever wrote it did!


Keeping comments in the pre-processed linker scripts
is troublesome.

That is why -C was removed from scripts/Makefile.build


commit 5cb0512c02ecd7e6214e912e4c150f4219ac78e0
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Thu Nov 2 14:10:37 2017 -0700

    Kbuild: don't pass "-C" to preprocessor when processing linker scripts




You can entirely remove

 CPPFLAGS_vdso32.lds += -P -C -Upowerpc





-- 
Best Regards
Masahiro Yamada