[tip:x86/asmlinkage] Kbuild, lto: add ld-version and ld-ifversion macros

[tip-bot for Andi Kleen]

Commit-ID:  ccbef1674a1579842c7dbdf554efca85d2cd245a
Gitweb:     http://git.kernel.org/tip/ccbef1674a1579842c7dbdf554efca85d2cd245a
Author:     Andi Kleen <ak@xxxxxxxxxxxxxxx>
AuthorDate: Sat, 8 Feb 2014 09:01:13 +0100
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Thu, 13 Feb 2014 20:25:00 -0800

Kbuild, lto: add ld-version and ld-ifversion macros

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

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1391846481-31491-9-git-send-email-ak@xxxxxxxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
 scripts/Kbuild.include | 9 +++++++++
 scripts/ld-version.sh  | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 547e15d..93a0da2 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..198580d
--- /dev/null
+++ b/scripts/ld-version.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/awk -f
+# extract 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
+	}
--
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