Accepting request 907544 from home:Andreas_Schwab:glibc:rebuild

- sigsegv-stack.patch: Port alternate signal stack to upcoming glibc 2.34

OBS-URL: https://build.opensuse.org/request/show/907544
OBS-URL: https://build.opensuse.org/package/show/editors/emacs?expand=0&rev=311

emacs.changes

@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Jul 21 09:22:45 UTC 2021 - Andreas Schwab <schwab@suse.de>
+
+- sigsegv-stack.patch: Port alternate signal stack to upcoming glibc 2.34
+
 -------------------------------------------------------------------
 Fri Jun 11 10:24:47 UTC 2021 - Dr. Werner Fink <werner@suse.de>
 

emacs.spec

@@ -181,6 +181,7 @@ Patch29:        emacs-27.1-Xauthority4server.patch
 # This patch allows vte based terminals like gnome-terminal to get 24bit colors
 # without setting a custom terminfo, honouring COLORTERM=truecolor
 Patch30:        emacs-27.2-COLORTERM-24bit.patch
+Patch39:        sigsegv-stack.patch
 
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 %{expand: %%global include_info %(test -s /usr/share/info/info.info* && echo 0 || echo 1)}
@@ -298,6 +299,7 @@ and most assembler-like syntaxes.
 %patch26 -p0 -b .fmt
 %patch29 -p0 -b .xauth
 %patch30 -p1 -b .colorterm
+%patch39 -p1
 %patch   -p0 -b .0
 %if %{without tex4pdf}
 pushd etc/refcards/

sigsegv-stack.patch

@@ -0,0 +1,40 @@
+From f97e07ea807cc6d38774a3888a15091b20645ac6 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Tue, 9 Mar 2021 11:22:59 -0800
+Subject: [PATCH] Port alternate signal stack to upcoming glibc 2.34
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+* src/sysdep.c (sigsegv_stack): Increase size to 64 KiB and align
+it to max_align_t.  This copies from Gnulib’s c-stack.c, and works
+around a portability bug in draft glibc 2.34, which no longer
+defines SIGSTKSZ when _GNU_SOURCE is defined.
+---
+ src/sysdep.c | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/src/sysdep.c b/src/sysdep.c
+index 941b4e2fa2..24d8832b2f 100644
+--- a/src/sysdep.c
++++ b/src/sysdep.c
+@@ -1785,7 +1785,15 @@ handle_arith_signal (int sig)
+ 
+ /* Alternate stack used by SIGSEGV handler below.  */
+ 
+-static unsigned char sigsegv_stack[SIGSTKSZ];
++/* Storage for the alternate signal stack.
++   64 KiB is not too large for Emacs, and is large enough
++   for all known platforms.  Smaller sizes may run into trouble.
++   For example, libsigsegv 2.6 through 2.8 have a bug where some
++   architectures use more than the Linux default of an 8 KiB alternate
++   stack when deciding if a fault was caused by stack overflow.  */
++static max_align_t sigsegv_stack[(64 * 1024
++				  + sizeof (max_align_t) - 1)
++				 / sizeof (max_align_t)];
+ 
+ 
+ /* Return true if SIGINFO indicates a stack overflow.  */
+-- 
+2.32.0
+