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

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Message-Id: <20190207220155.81351-1-ndesaulniers@google.com>
Date:   Thu,  7 Feb 2019 14:01:49 -0800
From:   ndesaulniers@...gle.com
To:     yamada.masahiro@...ionext.com
Cc:     Nick Desaulniers <ndesaulniers@...gle.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>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Adrian Reber <adrian@...as.de>,
        Richard Guy Briggs <rgb@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] init/Kconfig: add config support for detecting linker

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>
---
 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