gdb: Fix build with musl

This is a patch that has been submitted upstream as well

(From OE-Core rev: 87376746d64aea47cce327d951692c31d4acf872)

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-devtools/gdb/gdb.inc

@@ -5,6 +5,7 @@ inherit gettext
 SRC_URI += "file://0002-Change-order-of-CFLAGS.patch \
             file://0003-Add-support-for-Renesas-SH-sh4-architecture.patch \
             file://fix-detection-of-64-bit-PPC-inferior-in-gdbserver.patch \
+            file://0001-Use-exported-definitions-of-SIGRTMIN.patch \
            "
 #LDFLAGS_append = " -s"
 #export CFLAGS_append=" -L${STAGING_LIBDIR}"

meta/recipes-devtools/gdb/gdb/0001-Use-exported-definitions-of-SIGRTMIN.patch

@@ -0,0 +1,54 @@
+From 2f97e89e9e4e5797d0d973e1d05c1f44c46b4912 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Fri, 5 Jun 2015 20:21:38 -0700
+Subject: [PATCH] Use exorted definitions of SIGRTMIN
+
+Define W_STOPCODE if not defined already
+
+__SIGRTMIN is internal to glibc and other libcs e.g. musl
+may not provide them
+
+Fixes
+https://sourceware.org/bugzilla/show_bug.cgi?id=13012
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Submitted
+
+ gdb/linux-nat.c     | 4 ++--
+ gdb/nat/linux-nat.h | 4 ++++
+ 2 files changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
+index 396c30c..50320ee 100644
+--- a/gdb/linux-nat.c
++++ b/gdb/linux-nat.c
+@@ -4856,10 +4856,10 @@ lin_thread_get_thread_signals (sigset_t *set)
+      fortunately they don't change!  */
+ 
+   if (restart == 0)
+-    restart = __SIGRTMIN;
++    restart = SIGRTMIN;
+ 
+   if (cancel == 0)
+-    cancel = __SIGRTMIN + 1;
++    cancel = SIGRTMIN + 1;
+ 
+   sigaddset (set, restart);
+   sigaddset (set, cancel);
+diff --git a/gdb/nat/linux-nat.h b/gdb/nat/linux-nat.h
+index 83a6d91..efbe0fd 100644
+--- a/gdb/nat/linux-nat.h
++++ b/gdb/nat/linux-nat.h
+@@ -25,4 +25,8 @@
+    instead SIGTRAP with bit 7 set.  */
+ #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
+ 
++#ifndef W_STOPCODE
++#define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
++#endif
++
+ #endif /* LINUX_NAT_H */
+-- 
+2.1.4
+