Fix FTBFS with glibc 2.34

backport-emacs-glibc-2.34.patch

@@ -0,0 +1,39 @@
+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.  */
+-- 
+2.29.2

emacs.spec

@@ -4,7 +4,7 @@
 Name:          emacs
 Epoch:         1
 Version:       27.2
-Release:       1
+Release:       2
 Summary:       An extensible GNU text editor
 License:       GPLv3+ and CC0-1.0
 URL:           http://www.gnu.org/software/emacs
@@ -18,8 +18,9 @@ Source6:       emacs.desktop
 Source7:       emacs-terminal.desktop
 Source8:       %{name}.appdata.xml
 
-Patch1:        emacs-spellchecker.patch
-Patch2:        emacs-system-crypto-policies.patch
+Patch6001:        emacs-spellchecker.patch
+Patch6002:        emacs-system-crypto-policies.patch
+Patch6003:        backport-emacs-glibc-2.34.patch
 
 BuildRequires: gcc atk-devel cairo-devel freetype-devel fontconfig-devel dbus-devel giflib-devel
 BuildRequires: glibc-devel zlib-devel gnutls-devel libselinux-devel GConf2-devel alsa-lib-devel
@@ -398,6 +399,9 @@ fi
 %{_infodir}/*
 
 %changelog
+* Tue Aug 10 2021 yanan <yanan@huawei.com> - 1:27.2-2
+- DESC: Fix FTBFS with glibc 2.34
+
 * Mon Jul 19 2021 wangkerong <wangkerong@huawei.com> - 1:27.2-1
 - DESC: upgrade to 1:27.2