linux-kernel - Re: [PATCH] kbuild: flatten KBUILD

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Message-ID: <ZLGiQxF5ffbWR7tR@fjasle.eu>
Date:   Fri, 14 Jul 2023 21:30:11 +0200
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     akpm@...ux-foundation.org, masahiroy@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kbuild: flatten KBUILD_CFLAGS

On Fri, Jul 14, 2023 at 08:45:00PM +0300 Alexey Dobriyan wrote:
> On Fri, Jul 14, 2023 at 12:42:11PM +0200, Nicolas Schier wrote:
> > On Thu, Jul 13, 2023 at 09:52:28PM +0300, Alexey Dobriyan wrote:
> > > Make it slightly easier to see which compiler options are added and
> > > removed (and not worry about column limit too!).
> > > 
> > > Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> > > ---
> > > 
> > >  Makefile |   22 +++++++++++++++++-----
> > >  1 file changed, 17 insertions(+), 5 deletions(-)
> > > 
> > > --- a/Makefile
> > > +++ b/Makefile
> > > @@ -555,11 +555,23 @@ LINUXINCLUDE    := \
> > >  		$(USERINCLUDE)
> > >  
> > >  KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
> > > -KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
> > > -		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
> > > -		   -Werror=implicit-function-declaration -Werror=implicit-int \
> > > -		   -Werror=return-type -Wno-format-security -funsigned-char \
> > > -		   -std=gnu11
> > > +
> > > +KBUILD_CFLAGS :=
> > > +KBUILD_CFLAGS += -std=gnu11
> > 
> > If you want to put -std at top, on contrast to the sorted options below,
> > you could also merge the two lines above.
> 
> I don't know. Standard choice is arguably the most important option
> so I put it first.

yes, I think I would have put it on top, too.  I just would write it this way:

    KBUILD_CFLAGS := -std=gnu11

    KBUILD_CFLAGS += ...

But it is bike-shedding, ignore it if you're not convinced.

Kind regards,
Nicolas


> > > +KBUILD_CFLAGS += -fshort-wchar
> > > +KBUILD_CFLAGS += -funsigned-char
> > > +KBUILD_CFLAGS += -fno-common
> > > +KBUILD_CFLAGS += -fno-PIE
> > > +KBUILD_CFLAGS += -fno-strict-aliasing
> > > +KBUILD_CFLAGS += -Wall
> > > +KBUILD_CFLAGS += -Wundef
> > > +KBUILD_CFLAGS += -Werror=implicit-function-declaration
> > > +KBUILD_CFLAGS += -Werror=implicit-int
> > > +KBUILD_CFLAGS += -Werror=return-type
> > > +KBUILD_CFLAGS += -Werror=strict-prototypes
> > > +KBUILD_CFLAGS += -Wno-format-security
> > > +KBUILD_CFLAGS += -Wno-trigraphs

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