linux-kernel - Re: [PATCH v2 1/2] init/kconfig: Add LD

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Message-ID: <20200504080651.GA2621@willie-the-truck>
Date:   Mon, 4 May 2020 09:06:51 +0100
From:   Will Deacon <will@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Amit Daniel Kachhap <amit.kachhap@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <Vincenzo.Frascino@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v2 1/2] init/kconfig: Add LD_VERSION Kconfig

On Mon, May 04, 2020 at 09:11:12AM +0200, Geert Uytterhoeven wrote:
> On Mon, Mar 30, 2020 at 1:42 PM Amit Daniel Kachhap
> <amit.kachhap@....com> wrote:
> > This option can be used in Kconfig files to compare the ld version
> > and enable/disable incompatible config options if required.
> >
> > This option is used in the subsequent patch along with GCC_VERSION to
> > filter out an incompatible feature.
> >
> > Signed-off-by: Amit Daniel Kachhap <amit.kachhap@....com>
> 
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -17,6 +17,10 @@ config GCC_VERSION
> >         default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
> >         default 0
> >
> > +config LD_VERSION
> > +       int
> > +       default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
> > +
> >  config CC_IS_CLANG
> >         def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
> 
> .config: warning: symbol value '2.01827e+11' invalid for LD_VERSION
> 
> Seen with the or32 compiler on kisskb, e.g.
> http://kisskb.ellerman.id.au/kisskb/buildresult/14226173/

Hmm. The binutils version there is '2.26.20160125', but I think
scripts/ld-version.sh is expecting that to be '2.26.0.20160125' as it would
then ignore the date suffix as of commit 0d61ed17dd30 ("ld-version: Drop
the 4th and 5th version components"). On a 32-bit host architecture, the
awk expression ends up printing the version using exponential notation,
but even on a 64-bit arch the number would still be bogus.

Will