gdb: Fix aarch64 build with musl

(From OE-Core rev: f178990495c773b4b36b1be6aafc2da158b76894)

Signed-off-by: Paul Barker <paul@betafive.co.uk>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gdb/gdb-8.2.1.inc

@@ -18,6 +18,7 @@ SRC_URI = "http://ftp.gnu.org/gnu/gdb/gdb-${PV}.tar.xz \
            file://gdbserver-ctrl-c-handling.patch \
            file://0001-Fix-build-with-latest-GCC-9.0-tree.patch \
            file://CVE-2017-9778.patch \
+           file://0012-AArch64-Fix-the-gdb-build-with-musl-libc.patch \
 "
 SRC_URI[md5sum] = "f8b2562e830a4098dd5b5ea9e9296c70"
 SRC_URI[sha256sum] = "0a6a432907a03c5c8eaad3c3cffd50c00a40c3a5e3c4039440624bae703f2202"

meta/recipes-devtools/gdb/gdb/0012-AArch64-Fix-the-gdb-build-with-musl-libc.patch

@@ -0,0 +1,52 @@
+From cbbf1a8ba7f037ba3b83f090829edcbab542c285 Mon Sep 17 00:00:00 2001
+From: Szabolcs Nagy <szabolcs.nagy@arm.com>
+Date: Thu, 13 Dec 2018 17:47:17 +0000
+Subject: [PATCH] AArch64: Fix the gdb build with musl libc
+
+Including asm/sigcontext.h together with libc headers is not valid. In
+general linux headers may not work with libc headers, so mixing them
+should be avoided, especially when the linux header defines types that
+are also exposed in libc headers.
+
+In case of asm/sigcontext.h glibc happens to work because glibc signal.h
+directly includes it, but e.g. in musl libc signal.h replicates the
+sigcontext.h definitions in an abi compatible way which are in conflict
+with the linux definitions when both headers are included.
+
+Since old linux headers or old libc headers may not have the necessary
+definitions, gdb has to replicate the definitions it relies on anyway.
+Which is fine since all definitions must be ABI stable. For linux apis
+that are not available via libc headers, replicating the definitions in
+gdb is the most reliable way to use them.
+
+Note: asm/ptrace.h includes asm/sigcontext.h in some versions of linux
+headers, which is just as problematic and should be fixed in linux.
+
+gdb/ChangeLog:
+
+	* nat/aarch64-sve-linux-ptrace.h: Include signal.h instead of
+	asm/sigcontext.h.
+
+[ChangeLog entry stripped so that patch applies cleanly]
+Upstream-Status: Backport
+Signed-off-by: Paul Barker <paul@betafive.co.uk>
+---
+ gdb/nat/aarch64-sve-linux-ptrace.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/gdb/nat/aarch64-sve-linux-ptrace.h b/gdb/nat/aarch64-sve-linux-ptrace.h
+index 029e753ffe..172ae39432 100644
+--- a/gdb/nat/aarch64-sve-linux-ptrace.h
++++ b/gdb/nat/aarch64-sve-linux-ptrace.h
+@@ -20,7 +20,7 @@
+ #ifndef AARCH64_SVE_LINUX_PTRACE_H
+ #define AARCH64_SVE_LINUX_PTRACE_H
+ 
+-#include <asm/sigcontext.h>
++#include <signal.h>
+ #include <sys/utsname.h>
+ #include <sys/ptrace.h>
+ #include <asm/ptrace.h>
+-- 
+2.17.1
+