linux-kernel - Re: [PATCH 1/4] init/Kconfig: add config support for detecting linker

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Date:   Thu, 7 Feb 2019 19:57:20 -0500 (EST)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     ndesaulniers@...gle.com
Cc:     yamada masahiro <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>,
        Kees Cook <keescook@...omium.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Nicholas Piggin <npiggin@...il.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Adrian Reber <adrian@...as.de>,
        Richard Guy Briggs <rgb@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] init/Kconfig: add config support for detecting
 linker


----- 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.

What guarantees that the linker used for e.g. make defconfig is the same linker used for make ?

Is it required with this patch ?

How does it work in a cross compile environment ?

Thanks,

Mathieu


> 
> Cc: Nathan Chancellor <natechancellor@...il.com>
> Cc: Sami Tolvanen <samitolvanen@...gle.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  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
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com