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SubjectRe: [PATCH] Makefile: reuse CC_VERSION_TEXT
On Sat, Feb 6, 2021 at 2:49 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Sat, Feb 6, 2021 at 7:01 AM 'Nick Desaulniers' via Clang Built
> Linux <clang-built-linux@googlegroups.com> wrote:
> >
> > I noticed we're invoking $(CC) via $(shell) more than once to check the
> > version. Let's reuse the first string captured in $CC_VERSION_TEXT.
> >
> > Fixes: 315bab4e972d ("kbuild: fix endless syncconfig in case arch Makefile sets CROSS_COMPILE")
>
>
> I did not touch this hunk because I have a plan
> for different refactoring, but I have never got
> around to do it.
>
> Anyway, you beat me, and I will pick this up.
> But, the Fixes tag is questionable because
> this is code refactoring.
>

When I see this... and hear refactoring... As a suggestion/improvement...

Can we have LD_VERSION_TEXT analogue to CC_VERSION_TEXT?
Both are shown when doing a `cat /proc/version` (and IIRC in file
include/generated/compile.h).

Thanks.

- Sedat -

>
> > Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> > ---
> > Makefile | 14 +++++++-------
> > 1 file changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/Makefile b/Makefile
> > index a85535eb6a7d..70034d7c1051 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -557,7 +557,13 @@ ifdef building_out_of_srctree
> > { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
> > endif
> >
> > -ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
> > +# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
> > +# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
> > +# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
> > +# and from include/config/auto.conf.cmd to detect the compiler upgrade.
> > +CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
> > +
> > +ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
> > ifneq ($(CROSS_COMPILE),)
> > CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
> > GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
> > @@ -576,12 +582,6 @@ KBUILD_AFLAGS += $(CLANG_FLAGS)
> > export CLANG_FLAGS
> > endif
> >
> > -# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
> > -# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
> > -# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
> > -# and from include/config/auto.conf.cmd to detect the compiler upgrade.
> > -CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
> > -
> > ifdef config-build
> > # ===========================================================================
> > # *config targets only - make sure prerequisites are updated, and descend
> > --
> > 2.30.0.478.g8a0d178c01-goog
> >
> > --
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> > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20210205220125.2931504-1-ndesaulniers%40google.com.
>
>
>
> --
> Best Regards
> Masahiro Yamada
>
> --
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