From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
To check the linker version. Used by the LTO makefile.
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
Documentation/kbuild/makefiles.txt | 10 ++++++++++
scripts/Kbuild.include | 9 +++++++++
scripts/ld-version.sh | 8 ++++++++
3 files changed, 27 insertions(+)
create mode 100755 scripts/ld-version.sh
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index d567a7c..40d51f3 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -595,6 +595,16 @@ more details, with real examples.
#Makefile
LDFLAGS_vmlinux += $(call ld-option, -X)
+ ld-version
+ ld-version returns the full version number of $(LD), for three
+ number binutils versions, like the Linux binutils
+
+ ld-ifversion
+ Check the version number of the $(LD) linker in an if.
+
+ Example:
+ #Makefile.lto
+ ifeq ($(call ld-ifversion,-ge,22710001,y),y)
=== 4 Host Program support
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
+ }
--
1.8.5.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
