https://bugs.gentoo.org/855953
https://bugs.gentoo.org/893896
https://git.savannah.gnu.org/gitweb/?p=libsigsegv.git;a=commit;h=3030c472c9d7e1ffb2c6ce8c815545146a6ff8b8
https://git.savannah.gnu.org/gitweb/?p=libsigsegv.git;a=commit;h=bfa4d54ddbd8caabbe2e9a943395905e40f45f00

From 3030c472c9d7e1ffb2c6ce8c815545146a6ff8b8 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sat, 11 Feb 2023 18:43:46 +0100
Subject: [PATCH] Don't let configure tests fail due to the picky clang 16
 compiler.

clang 16 will report an error for -Wincompatible-function-pointer-types
by default.

Reported by Sam James <sam@gentoo.org> in
<https://savannah.gnu.org/bugs/index.php?63788>.

* configure.ac (MacOSX/Darwin7 PowerPC): Add a cast when assigning to
action.sa_sigaction.
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 dnl Autoconf configuration for libsigsegv.
 dnl Process this file with autoconf to produce a configure script.
 dnl
-dnl Copyright (C) 2002-2022  Bruno Haible <bruno@clisp.org>
+dnl Copyright (C) 2002-2023  Bruno Haible <bruno@clisp.org>
 dnl
 dnl This program is free software: you can redistribute it and/or modify
 dnl it under the terms of the GNU General Public License as published by
@@ -238,7 +238,7 @@ SV_TRY_FAULT([MacOSX/Darwin7 PowerPC], sv_cv_fault_macosdarwin7_ppc,
   [#include "$srcdir/src/fault-macosdarwin7-powerpc.c"],
   [int sig, siginfo_t *sip, ucontext_t *ucp],
   [get_fault_addr (sip, ucp)],
-  [action.sa_sigaction = &sigsegv_handler;
+  [action.sa_sigaction = (void (*) (int, siginfo_t *, void *)) &sigsegv_handler;
    action.sa_flags = SA_SIGINFO;])
 
 if test "$sv_cv_fault_macosdarwin7_ppc" != yes; then
-- 
2.17.1

From bfa4d54ddbd8caabbe2e9a943395905e40f45f00 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Thu, 29 Jun 2023 11:24:26 +0200
Subject: [PATCH] Make the autoconf tests more robust.
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

Triggered by
https://gitlab.com/redhat/centos-stream/rpms/libsigsegv/-/blob/c9s/configure.patch
from Petr Å abata <contyk@redhat.com>.

* m4/fault.m4 (SV_TRY_FAULT): Mark the variables that are accessed by
the signal handler as 'volatile'.
--- a/m4/fault.m4
+++ b/m4/fault.m4
@@ -1,5 +1,5 @@
-# fault.m4 serial 9 (libsigsegv-2.12)
-dnl Copyright (C) 2002-2003, 2011, 2017 Bruno Haible <bruno@clisp.org>
+# fault.m4 serial 10 (libsigsegv-2.15)
+dnl Copyright (C) 2002-2003, 2011, 2017, 2023 Bruno Haible <bruno@clisp.org>
 dnl This file is free software, distributed under the terms of the GNU
 dnl General Public License.  As a special exception to the GNU General
 dnl Public License, this file may be distributed as part of a program
@@ -52,8 +52,8 @@ static int zero_fd;
 #else
 # define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS 0UL
 #endif
-unsigned long page;
-int handler_called = 0;
+unsigned long volatile page;
+int volatile handler_called = 0;
 void sigsegv_handler ($5)
 {
   void *fault_address = (void *) ($6);
-- 
2.17.1