linux-kernel - Re: [PATCH] powerpc: vdso: drop unnecessary cc-ldoption

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Date:   Tue, 30 Apr 2019 13:25:39 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Joel Stanley <joel@....id.au>
Cc:     clang-built-linux <clang-built-linux@...glegroups.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: vdso: drop unnecessary cc-ldoption

On Tue, Apr 23, 2019 at 2:11 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> Towards the goal of removing cc-ldoption, 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.
>
> Link: https://gcc.gnu.org/ml/gcc/2007-01/msg01141.html
> Cc: clang-built-linux@...glegroups.com
> Suggested-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  arch/powerpc/kernel/vdso32/Makefile | 5 ++---
>  arch/powerpc/kernel/vdso64/Makefile | 5 ++---
>  2 files changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile
> index ce199f6e4256..06f54d947057 100644
> --- a/arch/powerpc/kernel/vdso32/Makefile
> +++ b/arch/powerpc/kernel/vdso32/Makefile
> @@ -26,9 +26,8 @@ GCOV_PROFILE := n
>  KCOV_INSTRUMENT := n
>  UBSAN_SANITIZE := n
>
> -ccflags-y := -shared -fno-common -fno-builtin
> -ccflags-y += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
> -               $(call cc-ldoption, -Wl$(comma)--hash-style=both)
> +ccflags-y := -shared -fno-common -fno-builtin -nostdlib \
> +       -Wl,-soname=linux-vdso32.so.1 -Wl,--hash-style=both
>  asflags-y := -D__VDSO32__ -s
>
>  obj-y += vdso32_wrapper.o
> diff --git a/arch/powerpc/kernel/vdso64/Makefile b/arch/powerpc/kernel/vdso64/Makefile
> index 28e7d112aa2f..32ebb3522ea1 100644
> --- a/arch/powerpc/kernel/vdso64/Makefile
> +++ b/arch/powerpc/kernel/vdso64/Makefile
> @@ -12,9 +12,8 @@ GCOV_PROFILE := n
>  KCOV_INSTRUMENT := n
>  UBSAN_SANITIZE := n
>
> -ccflags-y := -shared -fno-common -fno-builtin
> -ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
> -               $(call cc-ldoption, -Wl$(comma)--hash-style=both)
> +ccflags-y := -shared -fno-common -fno-builtin -nostdlib \
> +       -Wl,-soname=linux-vdso64.so.1 -Wl,--hash-style=both
>  asflags-y := -D__VDSO64__ -s
>
>  obj-y += vdso64_wrapper.o
> --
> 2.21.0.593.g511ec345e18-goog
>

bumping for review
-- 
Thanks,
~Nick Desaulniers