linux-kernel - Re: [PATCH] sh: require --Wl,--hash-style=sysv

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Date:   Wed, 24 Apr 2019 15:39:31 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andy Lutomirsky <luto@...nel.org>,
        clang-built-linux@...glegroups.com,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sh: require --Wl,--hash-style=sysv

On Wed, Apr 24, 2019 at 3:37 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> On Wed, Apr 24, 2019 at 3:29 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> >
> > Hi Nick,
> >
> > On Tue, Apr 23, 2019 at 10:31 PM Nick Desaulniers
> > <ndesaulniers@...gle.com> wrote:
> > > Towards the goal of removing cc-ldoption, prefer ld-option, or better
> > > yet, require --Wl,--hash-style=sysv since the selftest for vdso's
> > > requires DT_HASH.
> > >
> > > Cc: Andy Lutomirsky <luto@...nel.org>
> > > Cc: clang-built-linux@...glegroups.com
> > > Suggested-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > > Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> >
> > Thanks for your patch!
> >
> > > --- a/arch/sh/kernel/vsyscall/Makefile
> > > +++ b/arch/sh/kernel/vsyscall/Makefile
> > > @@ -15,8 +15,7 @@ quiet_cmd_syscall = SYSCALL $@
> > >
> > >  export CPPFLAGS_vsyscall.lds += -P -C -Ush
> > >
> > > -vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 \
> > > -               $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
> > > +vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 -Wl,--hash-style=sysv
> > >
> > >  SYSCFLAGS_vsyscall-trapa.so    = $(vsyscall-flags)
> >
> > What impact does this have on the minimum binutils version needed to
> > compile the kernel?
> >
>
>
> See his ia64 variant:
> https://lore.kernel.org/patchwork/patch/1065347/
>
>
> He commented a stronger reason
> "it seems that --hash-style= was added to binutils 2.17.50.0.2 in 2006.
> The minimal required version of binutils for the kernel according to
> Documentation/process/changes.rst is 2.20"
>
>
> Nick,
> Why don't you rephrase the commit log like your ia64 one?
> It will clarify this change has no impact.
>
>
> BTW, I think the subject should be
> "-Wl,--hash-style=sysv" instead of
> "--Wl,--hash-style=sysv"
>
> (single hash before "Wl")

I mean "single dash"
just in case.  :)




-- 
Best Regards
Masahiro Yamada