Fix C compatibility issue in configure script

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

freeradius-configure-c99.patch

@@ -0,0 +1,35 @@
+The backtrace_symbols function expects a pointer to an array of void *
+values, not a pointer to an array of a single element. Removing the
+address operator ensures that the right type is used.
+
+This avoids an unconditional failure of this probe with compilers that
+treat incompatible pointer types as a compilation error.
+
+Submitted upstream: <https://github.com/FreeRADIUS/freeradius-server/pull/5246>
+
+diff --git a/configure b/configure
+index ed01ee2bdd912f63..1e6d2284779cdd58 100755
+--- a/configure
++++ b/configure
+@@ -13390,7 +13390,7 @@ main (void)
+ {
+ 
+         void *sym[1];
+-        backtrace_symbols(&sym, sizeof(sym))
++        backtrace_symbols(sym, sizeof(sym))
+   ;
+   return 0;
+ }
+diff --git a/configure.ac b/configure.ac
+index 76320213b51d7bb4..6a689711d6c90483 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -2168,7 +2168,7 @@ if test "x$ac_cv_header_execinfo_h" = "xyes"; then
+         #include <execinfo.h>
+       ]], [[
+         void *sym[1];
+-        backtrace_symbols(&sym, sizeof(sym)) ]])],[
++        backtrace_symbols(sym, sizeof(sym)) ]])],[
+         AC_MSG_RESULT(yes)
+         ac_cv_lib_execinfo_backtrace_symbols="yes"
+       ],[

freeradius.spec

@@ -1,7 +1,7 @@
 Summary: High-performance and highly configurable free RADIUS server
 Name: freeradius
 Version: 3.2.3
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: GPL-2.0-or-later AND LGPL-2.0-or-later
 URL: http://www.freeradius.org/
 
@@ -28,6 +28,7 @@ Patch4: freeradius-no-buildtime-cert-gen.patch
 Patch5: freeradius-bootstrap-make-permissions.patch
 Patch6: freeradius-ldap-infinite-timeout-on-starttls.patch
 Patch7: freeradius-ease-openssl-version-check.patch
+Patch8: freeradius-configure-c99.patch
 
 %global docdir %{?_pkgdocdir}%{!?_pkgdocdir:%{_docdir}/%{name}-%{version}}
 
@@ -211,6 +212,7 @@ This plugin provides the REST support for the FreeRADIUS server project.
 %patch5 -p1
 %patch6 -p1
 %patch7 -p1
+%patch8 -p1
 
 %build
 # Force compile/link options, extra security for network facing daemon
@@ -894,6 +896,9 @@ EOF
 %attr(640,root,radiusd) %config(noreplace) /etc/raddb/mods-available/rest
 
 %changelog
+* Tue Dec 19 2023 Florian Weimer <fweimer@redhat.com> - 3.2.3-2
+- Fix C compatibility issue in configure script
+
 * Tue Oct 24 2023 Antonio Torres <antorres@redhat.com> - 3.2.3-1
 - Update to upstream release 3.2.3