linux-kernel - [PATCH 62/74] Kbuild, lto: add ld-version and ld-ifversion macros

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Date:	Sat, 18 Aug 2012 19:56:58 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, mmarek@...e.cz, linux-kbuild@...r.kernel.org,
	JBeulich@...e.com, akpm@...ux-foundation.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 62/74] Kbuild, lto: add ld-version and ld-ifversion macros

From: Andi Kleen <ak@...ux.intel.com>

To check the linker version. Used by the LTO makefile.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 scripts/Kbuild.include |    9 +++++++++
 scripts/ld-version.sh  |    8 ++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)
 create mode 100755 scripts/ld-version.sh

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 6a3ee98..bda5b20 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -155,6 +155,15 @@ ld-option = $(call try-run,\
 # Important: no spaces around options
 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
 
+# ld-version
+# Usage: $(call ld-version)
+# Note this is mainly for HJ Lu's 3 number binutil versions
+ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
+
+# ld-ifversion
+# Usage:  $(call ld-ifversion, -ge, 22252, y)
+ld-ifversion = $(shell [ $(call ld-version) $(1) $(2) ] && echo $(3))
+
 ######
 
 ###
diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
new file mode 100755
index 0000000..7eb0b76
--- /dev/null
+++ b/scripts/ld-version.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/awk -f
+# extra linker version number from stdin and turn into single number
+	{ 
+	gsub(".*)", ""); 
+	split($1,a, "."); 
+	print a[1]*10000000 + a[2]*100000 + a[3]*10000 + a[4]*100 + a[5]; 
+	exit 
+	}
-- 
1.7.7.6

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