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Date:   Fri, 8 Feb 2019 00:48:52 +0000
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Nicholas Piggin <npiggin@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Adrian Reber <adrian@...as.de>,
        Richard Guy Briggs <rgb@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] init/Kconfig: add config support for detecting linker

On Thu, Feb 7, 2019 at 10:02 PM <ndesaulniers@...gle.com> wrote:
>
> Similar to how we differentiate between CONFIG_CC_IS_GCC and
> CONFIG_CC_IS_CLANG, add CONFIG_LD_IS_BFD, CONFIG_LD_IS_GOLD, and
> CONFIG_LD_IS_LLD.
>
> This simiplifies patches to Makefiles that need to do different things
> for different linkers.
>
> Cc: Nathan Chancellor <natechancellor@...il.com>
> Cc: Sami Tolvanen <samitolvanen@...gle.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  init/Kconfig | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index c9386a365eea..b6046dcf7794 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -26,6 +26,15 @@ config CLANG_VERSION
>  config CC_HAS_ASM_GOTO
>         def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
>
> +config LD_IS_BFD
> +       def_bool $(success,$(LD) --version | head -n 1 | grep -q 'GNU ld')
> +
> +config LD_IS_GOLD
> +       def_bool $(success,$(LD) --version | head -n 1 | grep -q 'GNU gold')
> +
> +config LD_IS_LLD
> +       def_bool $(success,$(LD) --version | head -n 1 | grep -q 'LLD')
> +
>  config CONSTRUCTORS
>         bool
>         depends on !UML
> --
> 2.20.1.791.gb4d0f1c61a-goog
>


-- 
Kees Cook

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