linux-kernel - [PATCH v2 4/7] kbuild: add __ld-ifversion and linker-specific macros

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Date:   Thu, 30 Nov 2017 15:39:02 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Alex Matveev <alxmtvv@...il.com>, Andi Kleen <ak@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v2 4/7] kbuild: add __ld-ifversion and linker-specific macros

Add macros for testing both linker name and version.

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 scripts/Kbuild.include | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 899863e4cd05..2991b463b4ce 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -285,6 +285,18 @@ ld-version = $(call shell-cached,$(LD) --version | $(srctree)/scripts/ld-version
 # Usage:  $(call ld-ifversion, -ge, 22252, y)
 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
 
+# __ld-ifversion
+# Usage:  $(call __ld-ifversion, gold, -ge, 112000000, y)
+__ld-ifversion = $(shell [ $(ld-name) == $(1) ] && [ $(ld-version) $(2) $(3) ] && echo $(4) || echo $(5))
+
+# bfd-ifversion
+# Usage:  $(call bfd-ifversion, -ge, 227000000, y)
+bfd-ifversion = $(call __ld-ifversion, bfd, $(1), $(2), $(3), $(4))
+
+# gold-ifversion
+# Usage:  $(call gold-ifversion, -ge, 112000000, y)
+gold-ifversion = $(call __ld-ifversion, gold, $(1), $(2), $(3), $(4))
+
 ######
 
 ###
-- 
2.15.0.531.g2ccb3012c9-goog