linux-kernel - Re: [RESEND PATCH v2 1/2] Kbuild: lto: add CONFIG_MAKE

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Message-ID: <20210702032103.7787-1-lecopzer.chen@mediatek.com>
Date:   Fri, 2 Jul 2021 11:21:03 +0800
From:   Lecopzer Chen <lecopzer.chen@...iatek.com>
To:     <ndesaulniers@...gle.com>
CC:     <clang-built-linux@...glegroups.com>, <keescook@...omium.org>,
        <lecopzer.chen@...iatek.com>, <linux-kbuild@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <masahiroy@...nel.org>,
        <michal.lkml@...kovi.net>, <nathan@...nel.org>,
        <samitolvanen@...gle.com>, <yj.chiang@...iatek.com>
Subject: Re: [RESEND PATCH v2 1/2] Kbuild: lto: add CONFIG_MAKE_VERSION

> On Thu, Jul 1, 2021 at 2:28 AM Lecopzer Chen <lecopzer.chen@...iatek.com> wrote:
> >
> > To check the GNU make version. Used by the LTO Kconfig.
> >
> > LTO with MODVERSIONS will fail in generating correct CRC because
> > the makefile rule doesn't work for make with version 3.8X.[1]
> >
> > Thus we need to check make version during selecting on LTO Kconfig.
> > Add CONFIG_MAKE_VERSION which means MAKE_VERSION in canonical digits
> > for arithmetic comparisons.
> >
> > [1] https://lore.kernel.org/lkml/20210616080252.32046-1-lecopzer.chen@mediatek.com/
> > Signed-off-by: Lecopzer Chen <lecopzer.chen@...iatek.com>
> > ---
> >  Makefile                |  2 +-
> >  init/Kconfig            |  4 ++++
> >  scripts/make-version.sh | 13 +++++++++++++
> >  3 files changed, 18 insertions(+), 1 deletion(-)
> >  create mode 100755 scripts/make-version.sh
> >
> > diff --git a/Makefile b/Makefile
> > index 88888fff4c62..2402745b2ba9 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -516,7 +516,7 @@ CLANG_FLAGS :=
> >
> >  export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
> >  export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
> > -export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
> > +export PERL PYTHON3 CHECK CHECKFLAGS MAKE MAKE_VERSION UTS_MACHINE HOSTCXX
> >  export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
> >  export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
> >
> > diff --git a/init/Kconfig b/init/Kconfig
> > index 55f9f7738ebb..ecc110504f87 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -86,6 +86,10 @@ config CC_HAS_ASM_INLINE
> >  config CC_HAS_NO_PROFILE_FN_ATTR
> >         def_bool $(success,echo '__attribute__((no_profile_instrument_function)) int x();' | $(CC) -x c - -c -o /dev/null -Werror)
> >
> > +config MAKE_VERSION
> > +       int
> > +       default $(shell,$(srctree)/scripts/make-version.sh $(MAKE_VERSION))
> > +
> >  config CONSTRUCTORS
> >         bool
> >
> > diff --git a/scripts/make-version.sh b/scripts/make-version.sh
> > new file mode 100755
> > index 000000000000..ce5af96696cc
> > --- /dev/null
> > +++ b/scripts/make-version.sh
> > @@ -0,0 +1,13 @@
> > +#!/bin/sh
> > +# SPDX-License-Identifier: GPL-2.0
> > +#
> > +# Print the linker name and its version in a 5 or 6-digit form.
> 
> The linker? 

my bad, I'll fix this, thanks