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 <20210802183910.1802120-2-ndesaulniers@google.com> <CAFP8O3Jc=iwzAQojgBZZzdT8iVBY9TO6GLTq+0vkXoo6L5JJ-A@mail.gmail.com>
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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Thu, 5 Aug 2021 21:55:46 +0900
Message-ID: <CAK7LNAS4wQNvWd0H1bEG-zbznkm_kfQHEZWKUOPQqReA+Cru3w@mail.gmail.com>
Subject: Re: [PATCH v6 1/3] Makefile: move initial clang flag handling into scripts/Makefile.clang
To:     =?UTF-8?B?RsSBbmctcnXDrCBTw7JuZw==?= <maskray@google.com>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        Miguel Ojeda <ojeda@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Arnd Bergmann <arnd@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Christoph Hellwig <hch@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Nathan Chancellor <nathan@kernel.org>
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On Tue, Aug 3, 2021 at 6:06 AM 'F=C4=81ng-ru=C3=AC S=C3=B2ng' via Clang Bui=
lt Linux
<clang-built-linux@googlegroups.com> wrote:
>
> On Mon, Aug 2, 2021 at 11:39 AM Nick Desaulniers
> <ndesaulniers@google.com> wrote:
> >
> > With some of the changes we'd like to make to CROSS_COMPILE, the initia=
l
> > block of clang flag handling which controls things like the target trip=
le,
> > whether or not to use the integrated assembler and how to find GAS,
> > and erroring on unknown warnings is becoming unwieldy. Move it into its
> > own file under scripts/.
> >
> > Reviewed-by: Nathan Chancellor <nathan@kernel.org>
> > Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> > ---
> >  MAINTAINERS            |  1 +
> >  Makefile               | 15 +--------------
> >  scripts/Makefile.clang | 14 ++++++++++++++
> >  3 files changed, 16 insertions(+), 14 deletions(-)
> >  create mode 100644 scripts/Makefile.clang
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 19135a9d778e..3af8d39f43ef 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -4501,6 +4501,7 @@ B:        https://github.com/ClangBuiltLinux/linu=
x/issues
> >  C:     irc://chat.freenode.net/clangbuiltlinux
> >  F:     Documentation/kbuild/llvm.rst
> >  F:     include/linux/compiler-clang.h
> > +F:     scripts/Makefile.clang
> >  F:     scripts/clang-tools/
> >  K:     \b(?i:clang|llvm)\b
> >
> > diff --git a/Makefile b/Makefile
> > index 6b555f64df06..444558e62cbc 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -586,20 +586,7 @@ endif
> >  CC_VERSION_TEXT =3D $(subst $(pound),,$(shell $(CC) --version 2>/dev/n=
ull | head -n 1))
> >
> >  ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
> > -ifneq ($(CROSS_COMPILE),)
> > -CLANG_FLAGS    +=3D --target=3D$(notdir $(CROSS_COMPILE:%-=3D%))
> > -endif
> > -ifeq ($(LLVM_IAS),1)
> > -CLANG_FLAGS    +=3D -integrated-as
> > -else
> > -CLANG_FLAGS    +=3D -no-integrated-as
> > -GCC_TOOLCHAIN_DIR :=3D $(dir $(shell which $(CROSS_COMPILE)elfedit))
> > -CLANG_FLAGS    +=3D --prefix=3D$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_CO=
MPILE))
> > -endif
> > -CLANG_FLAGS    +=3D -Werror=3Dunknown-warning-option
> > -KBUILD_CFLAGS  +=3D $(CLANG_FLAGS)
> > -KBUILD_AFLAGS  +=3D $(CLANG_FLAGS)
> > -export CLANG_FLAGS
> > +include $(srctree)/scripts/Makefile.clang
> >  endif
> >
> >  # Include this also for config targets because some architectures need
> > diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang
> > new file mode 100644
> > index 000000000000..297932e973d4
> > --- /dev/null
> > +++ b/scripts/Makefile.clang
> > @@ -0,0 +1,14 @@
> > +ifneq ($(CROSS_COMPILE),)
> > +CLANG_FLAGS    +=3D --target=3D$(notdir $(CROSS_COMPILE:%-=3D%))
> > +endif
> > +ifeq ($(LLVM_IAS),1)
> > +CLANG_FLAGS    +=3D -integrated-as
>
> -i* options are for includes. -fintegrated-as is the canonical spelling.


If -fintegrated-as is preferred to -integrated-as,
please send a patch.
(on top of this series)


Thanks.


> Since -fintegrated-as is the default (for most llvm/lib/Target/
> targets and the ones clang builds actually support),
> it can even be deleted.
>
> > +else
> > +CLANG_FLAGS    +=3D -no-integrated-as
> > +GCC_TOOLCHAIN_DIR :=3D $(dir $(shell which $(CROSS_COMPILE)elfedit))
> > +CLANG_FLAGS    +=3D --prefix=3D$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_CO=
MPILE))
> > +endif
> > +CLANG_FLAGS    +=3D -Werror=3Dunknown-warning-option
> > +KBUILD_CFLAGS  +=3D $(CLANG_FLAGS)
> > +KBUILD_AFLAGS  +=3D $(CLANG_FLAGS)
> > +export CLANG_FLAGS
> > --
> > 2.32.0.554.ge1b32706d8-goog
> >
>
> --
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--=20
Best Regards
Masahiro Yamada