linux-kernel - [RFC PATCH 1/2] kbuild: add CONFIG_LD_IS

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Date:   Sun, 19 Apr 2020 15:19:47 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Tejun Heo <tj@...nel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Cc:     Sedat Dilek <sedat.dilek@...il.com>
Subject: [RFC PATCH 1/2] kbuild: add CONFIG_LD_IS_BINUTILS

This patch is currently not mandatory but a prerequisites for the second one.

Folks from ClangBuiltLinux project like the combination of Clang compiler
and LLD linker from LLVM project to build their Linux kernels.

Sami Tolvanen <samitolvanen@...gle.com> has a patch for using LD_IS_LLD (see [1]).

Documentation/process/changes.rst says and uses "binutils" that's why I called
it LD_IS_BINUTILS (see [2] and [3]).

The second patch will rename existing LD_VERSION to BINUTILS_VERSION to have
a consistent naming convention like:

1. CC_IS_GCC and GCC_VERSION
2. CC_IS_CLANG and CLANG_VERSION
3. LD_IS_BINUTILS and BINUTILS_VERSION

[1] https://github.com/samitolvanen/linux/commit/61889e01f0ed4f07a9d631f163bba6c6637bfa46
[2] https://git.kernel.org/linus/tree/Documentation/process/changes.rst#n34
[3] https://git.kernel.org/linus/tree/Documentation/process/changes.rst#n76

Signed-off-by: Sedat Dilek <sedat.dilek@...il.com>
---
 init/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index 9e22ee8fbd75..520116efea0f 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -16,9 +16,12 @@ config GCC_VERSION
 	default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
 	default 0
 
+config LD_IS_BINUTILS
+	def_bool $(success,$(LD) -v | head -n 1 | grep -q 'GNU ld')
+
 config LD_VERSION
 	int
-	default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
+	default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh) if LD_IS_BINUTILS
 
 config CC_IS_CLANG
 	def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
-- 
2.26.1