mdadm: Fix build with clang

(From OE-Core rev: d701293b9de2e23cac2f1b57af5b3d44f489c404)

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

meta/recipes-extended/mdadm/files/0001-mdadm.h-Undefine-dprintf-before-redefining.patch

@@ -0,0 +1,43 @@
+From 6d369e8f226594632ce4260129509daf7030de0a Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Mon, 9 May 2016 22:03:57 +0000
+Subject: [PATCH] mdadm.h: Undefine dprintf before redefining
+
+dprintf is also defined in libc see
+usr/include/bits/stdio2.h, this comes into
+play especially when fortify sources is enabled
+and compilers like clang reports the override
+
+In file included from policy.c:25:
+./mdadm.h:1562:9: error: 'dprintf' macro redefined [-Werror,-Wmacro-redefined]
+        ^
+/mnt/oe/openembedded-core/build/tmp-glibc/sysroots/qemux86/usr/include/bits/stdio2.h:145:12: note: previous definition is here
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ mdadm.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/mdadm.h b/mdadm.h
+index 230e60f..8c8f4d1 100755
+--- a/mdadm.h
++++ b/mdadm.h
+@@ -1554,11 +1554,13 @@ static inline char *to_subarray(struct mdstat_ent *ent, char *container)
+ }
+ 
+ #ifdef DEBUG
++#undef dprintf
+ #define dprintf(fmt, arg...) \
+ 	fprintf(stderr, "%s: %s: "fmt, Name, __func__, ##arg)
+ #define dprintf_cont(fmt, arg...) \
+ 	fprintf(stderr, fmt, ##arg)
+ #else
++#undef dprintf
+ #define dprintf(fmt, arg...) \
+         ({ if (0) fprintf(stderr, "%s: %s: " fmt, Name, __func__, ##arg); 0; })
+ #define dprintf_cont(fmt, arg...) \
+-- 
+1.9.1
+

meta/recipes-extended/mdadm/mdadm_3.4.bb

@@ -20,6 +20,7 @@ SRC_URI = "${KERNELORG_MIRROR}/linux/utils/raid/mdadm/${BPN}-${PV}.tar.xz \
            file://0001-Fix-the-path-of-corosync-and-dlm-header-files-check.patch \
            file://run-ptest \
            file://0001-raid6check-Fix-if-else-indentation.patch \
+           file://0001-mdadm.h-Undefine-dprintf-before-redefining.patch \
            "
 SRC_URI[md5sum] = "04b8b21f637540350f8517c7e68d3c63"
 SRC_URI[sha256sum] = "27d0be4627d38a12ddcd1c1c3721d649d4e89e1093914497e22b57245cda8808"