linux-kernel - Re: [PATCH v4] Makefile.compiler: replace cc-ifversion with compiler-specific macros

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Date:   Sun, 25 Sep 2022 10:22:38 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>,
        Bill Wendling <morbo@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH v4] Makefile.compiler: replace cc-ifversion with
 compiler-specific macros

On Sat, Sep 24, 2022 at 11:28 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Sat, Sep 24, 2022 at 4:44 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > On Tue, Sep 20, 2022 at 2:08 AM Nick Desaulniers
> > <ndesaulniers@...gle.com> wrote:
> > >
> > > cc-ifversion is GCC specific. Replace it with compiler specific
> > > variants. Update the users of cc-ifversion to use these new macros.
> > >
> > > Link: https://github.com/ClangBuiltLinux/linux/issues/350
> > > Link: https://lore.kernel.org/llvm/CAGG=3QWSAUakO42kubrCap8fp-gm1ERJJAYXTnP1iHk_wrH=BQ@mail.gmail.com/
> > > Suggested-by: Bill Wendling <morbo@...gle.com>
> > > Reviewed-by: Nathan Chancellor <nathan@...nel.org>
> > > Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> > > ---
> > > Changes v3 -> v4:
> > > * Split into its own patch again from series, as per Masahiro.
> > > * Rebase on top of b0839b281c427e844143dba3893e25c83cdd6c17 and update
> > >   clang -Wformat logic in scripts/Makefile.extrawarn, as per Masahiro.
> >
> >
> > Applied to linux-kbuild.
> > Thanks.
> >
> >
> >
> > --
> > Best Regards
> > Masahiro Yamada
>
>
>
>
>
>
> I noticed a small flaw now.
>
>
>
> $ make mrproper; make
> /bin/sh: 1: [: -ge: unexpected operator
> ***
> *** Configuration file ".config" not found!
> ***
> *** Please run some configurator (e.g. "make oldconfig" or
> *** "make menuconfig" or "make xconfig").
> ***
> Makefile:711: include/config/auto.conf.cmd: No such file or directory
> make: *** [Makefile:720: .config] Error 1
>
>
>
>
>
>
>
>
> This fails anyway, but it shows annoying
>
>    /bin/sh: 1: [: -ge: unexpected operator
>
>
>
> It is emit by this line:
>
>   KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
>
>
>
>
> When $(CONFIG_GCC_VERSION) is empty, it becomes invalid shell code:
>
>      [ -ge $(1) ] && echo y
>
>
>
>
>
> Now I just recalled why I wrote the original code like this:
>
>
>   cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ]  ...
>
>
>
>
> --
> Best Regards
> Masahiro Yamada







I squashed the following code diff.
Please let me know if there is a problem.









diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 9d18fb91890e..20d353dcabfb 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -63,11 +63,11 @@ cc-disable-warning = $(call try-run,\

 # gcc-min-version
 # Usage: cflags-$(call gcc-min-version, 70100) += -foo
-gcc-min-version = $(shell [ $(CONFIG_GCC_VERSION) -ge $(1) ] && echo y)
+gcc-min-version = $(shell [ $(CONFIG_GCC_VERSION)0 -ge $(1)0 ] && echo y)

 # clang-min-version
 # Usage: cflags-$(call clang-min-version, 110000) += -foo
-clang-min-version = $(shell [ $(CONFIG_CLANG_VERSION) -ge $(1) ] && echo y)
+clang-min-version = $(shell [ $(CONFIG_CLANG_VERSION)0 -ge $(1)0 ] && echo y)

 # ld-option
 # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)






-- 
Best Regards
Masahiro Yamada