gdb: Backport a fix to build with gcc9

(From OE-Core rev: 389d956bdacee92125c0112a58991516b866a39b)

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

2 files changed, 51 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gdb/gdb-8.2.inc b/meta/recipes-devtools/gdb/gdb-8.2.inc
index 7e0809de72..f6d75ed081 100644
--- a/meta/recipes-devtools/gdb/gdb-8.2.inc
+++ b/meta/recipes-devtools/gdb/gdb-8.2.inc
@@ -16,6 +16,7 @@ SRC_URI = "http://ftp.gnu.org/gnu/gdb/gdb-${PV}.tar.xz \
            file://0010-resolve-restrict-keyword-conflict.patch \
            file://0011-Fix-invalid-sigprocmask-call.patch \
            file://gdbserver-ctrl-c-handling.patch \
+           file://0001-Fix-build-with-latest-GCC-9.0-tree.patch \
 "
 SRC_URI[md5sum] = "b5a49dbff00d9a87fbe114d14b3101c0"
 SRC_URI[sha256sum] = "c3a441a29c7c89720b734e5a9c6289c0a06be7e0c76ef538f7bbcef389347c39"
diff --git a/meta/recipes-devtools/gdb/gdb/0001-Fix-build-with-latest-GCC-9.0-tree.patch b/meta/recipes-devtools/gdb/gdb/0001-Fix-build-with-latest-GCC-9.0-tree.patch
new file mode 100644
index 0000000000..2a962929d7
--- /dev/null
+++ b/meta/recipes-devtools/gdb/gdb/0001-Fix-build-with-latest-GCC-9.0-tree.patch
@@ -0,0 +1,50 @@
+From 7406a50077773e78282a495cb32ef5b8179f6a33 Mon Sep 17 00:00:00 2001
+From: Dimitar Dimitrov <dimitar@dinux.eu>
+Date: Mon, 17 Dec 2018 21:30:52 +0200
+Subject: [PATCH] Fix build with latest GCC 9.0 tree
+
+A recent patch [1] to fix a GCC PR [2] actually broke the GDB build.
+To fix, remove the stack pointer clobber. GCC will ignore the clobber
+marker, and will not save or restore the stack pointer.
+
+I ran "make check-gdb" on x86_64 to ensure there are no regressions.
+
+gdb/ChangeLog:
+
+2018-12-17  Dimitar Dimitrov  <dimitar@dinux.eu>
+
+        * nat/linux-ptrace.c (linux_ptrace_test_ret_to_nx): Remove sp clobbers.
+
+[1] https://gcc.gnu.org/ml/gcc-patches/2018-12/msg00532.html
+[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52813
+
+Upstream-Status: Backport
+Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
+---
+ gdb/ChangeLog          | 5 +++++
+ gdb/nat/linux-ptrace.c | 4 ++--
+ 2 files changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/gdb/nat/linux-ptrace.c b/gdb/nat/linux-ptrace.c
+index d4c1b8f9fd..187cfeb9bc 100644
+--- a/gdb/nat/linux-ptrace.c
++++ b/gdb/nat/linux-ptrace.c
+@@ -161,14 +161,14 @@ linux_ptrace_test_ret_to_nx (void)
+                        ".globl linux_ptrace_test_ret_to_nx_instr;"
+                        "linux_ptrace_test_ret_to_nx_instr:"
+                        "ret"
+-                       : : "r" (return_address) : "%esp", "memory");
++                       : : "r" (return_address) : "memory");
+ #elif defined __x86_64__
+          asm volatile ("pushq %0;"
+                        ".globl linux_ptrace_test_ret_to_nx_instr;"
+                        "linux_ptrace_test_ret_to_nx_instr:"
+                        "ret"
+                        : : "r" ((uint64_t) (uintptr_t) return_address)
+-                       : "%rsp", "memory");
++                       : "memory");
+ #else
+ # error "!__i386__ && !__x86_64__"
+ #endif
+--
+2.20.1