kexec-tools: Pass -r directly to linker

-r is understood by gcc but not by clang, anyway its a linker option so
pass it straight to linker by using -Wl explicitly

(From OE-Core rev: 3f4ab836d7d9b7a994b65ab8c7ebf6ff65e6277b)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-kernel/kexec/kexec-tools/0001-purgatory-Pass-r-directly-to-linker.patch

@@ -0,0 +1,32 @@
+From a1135b3170963ba956f2364c1283864c35541295 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Mon, 7 Sep 2015 07:59:45 +0000
+Subject: [PATCH] purgatory: Pass -r directly to linker
+
+This helps compiling with clang since -r is not a known option for clang
+where as gcc knows how to deal with it and passes it down to linker
+unfiltered
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ purgatory/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/purgatory/Makefile b/purgatory/Makefile
+index 2b5c061..b251353 100644
+--- a/purgatory/Makefile
++++ b/purgatory/Makefile
+@@ -61,7 +61,7 @@ $(PURGATORY): CPPFLAGS=$($(ARCH)_PURGATORY_EXTRA_CFLAGS) \
+ 			-I$(shell $(CC) -print-file-name=include)
+ $(PURGATORY): LDFLAGS=$($(ARCH)_PURGATORY_EXTRA_CFLAGS)\
+ 			-Wl,--no-undefined -nostartfiles -nostdlib \
+-			-nodefaultlibs -e purgatory_start -r \
++			-nodefaultlibs -e purgatory_start -Wl,-r \
+ 			-Wl,-Map=$(PURGATORY_MAP)
+ 
+ $(PURGATORY): $(PURGATORY_OBJS)
+-- 
+2.5.1
+

meta/recipes-kernel/kexec/kexec-tools_2.0.10.bb

@@ -6,6 +6,7 @@ SRC_URI += "file://kexec-tools-Refine-kdump-device_tree-sort.patch \
             file://kexec-aarch64.patch \
             file://kexec-x32.patch \
             file://0002-powerpc-change-the-memory-size-limit.patch \
+            file://0001-purgatory-Pass-r-directly-to-linker.patch \
          "
 
 SRC_URI[md5sum] = "6cb4d22bcec71b6e070aa8e9d990a5e6"