gdb: Fix build on mips64/musl

Define _ABIO32 if not already defined
heps in fixing gdb for mips64

(From OE-Core rev: 512d976585086028f22ea88218a2bbf900062588)

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

meta/recipes-devtools/gdb/gdb.inc

@@ -8,6 +8,7 @@ SRC_URI += "file://0002-Change-order-of-CFLAGS.patch \
             file://0001-include-sys-types.h-for-mode_t.patch \
             file://0001-use-asm-sgidefs.h.patch \
             file://force-readline-static.patch \
+            file://0001-mips-linux-nat-Define-_ABIO32-if-not-defined.patch \
            "
 #LDFLAGS_append = " -s"
 #export CFLAGS_append=" -L${STAGING_LIBDIR}"

meta/recipes-devtools/gdb/gdb/0001-mips-linux-nat-Define-_ABIO32-if-not-defined.patch

@@ -0,0 +1,37 @@
+From e92f8932ef488de2a56db4299131ce6a4eb170bd Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Wed, 23 Mar 2016 06:30:09 +0000
+Subject: [PATCH] mips-linux-nat: Define _ABIO32 if not defined
+
+This helps building gdb on mips64 on musl, since
+musl does not provide sgidefs.h this define is
+only defined when GCC is using o32 ABI, in that
+case gcc emits it as built-in define and hence
+it works ok for mips32
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ gdb/mips-linux-nat.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/gdb/mips-linux-nat.c b/gdb/mips-linux-nat.c
+index fd5c705..753f29d 100644
+--- a/gdb/mips-linux-nat.c
++++ b/gdb/mips-linux-nat.c
+@@ -46,6 +46,11 @@
+ #define PTRACE_GET_THREAD_AREA 25
+ #endif
+ 
++/* musl does not define and relies on compiler built-in macros for it   */
++#ifndef _ABIO32
++#define _ABIO32 1
++#endif
++
+ /* Assume that we have PTRACE_GETREGS et al. support.  If we do not,
+    we'll clear this and use PTRACE_PEEKUSER instead.  */
+ static int have_ptrace_regsets = 1;
+-- 
+1.8.3.1
+