gdb: fix invalid sigprocmask call

Fixes FS#637

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

package/devel/gdb/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=gdb
 PKG_VERSION:=7.12.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@GNU/gdb

package/devel/gdb/patches/120-sigprocmask-invalid-call.patch

@@ -0,0 +1,43 @@
+From 56893a61aa4f0270fa8d1197b9848247f90fce0d Mon Sep 17 00:00:00 2001
+From: Yousong Zhou <yszhou4tech@gmail.com>
+Date: Fri, 24 Mar 2017 10:36:03 +0800
+Subject: [PATCH] Fix invalid sigprocmask call
+
+The POSIX document says
+
+    The pthread_sigmask() and sigprocmask() functions shall fail if:
+
+    [EINVAL]
+    The value of the how argument is not equal to one of the defined values.
+
+and this is how musl-libc is currently doing.  Fix the call to be safe
+and correct
+
+ [1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_sigmask.html
+
+gdb/ChangeLog:
+2017-03-24  Yousong Zhou  <yszhou4tech@gmail.com>
+
+    * common/signals-state-save-restore.c (save_original_signals_state):
+    Fix invalid sigprocmask call.
+---
+ gdb/ChangeLog                           | 5 +++++
+ gdb/common/signals-state-save-restore.c | 2 +-
+ 2 files changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/gdb/common/signals-state-save-restore.c b/gdb/common/signals-state-save-restore.c
+index d11a9ae..734335c 100644
+--- a/gdb/common/signals-state-save-restore.c
++++ b/gdb/common/signals-state-save-restore.c
+@@ -41,7 +41,7 @@ save_original_signals_state (void)
+   int i;
+   int res;
+ 
+-  res = sigprocmask (0,  NULL, &original_signal_mask);
++  res = sigprocmask (SIG_BLOCK,  NULL, &original_signal_mask);
+   if (res == -1)
+     perror_with_name (("sigprocmask"));
+ 
+-- 
+2.6.4
+