libxml2 2.12 fix for incompatible-pointer-types errors with GCC 14

Also add a conditional BuildRequires: on python3-setuptools for
unbundled distutils in Python 3.12 and later.

lasso-libxml2.patch

@@ -0,0 +1,43 @@
+Adjust to structured error callback argument change in libxml2 2.12
+
+Submitted upstream: <https://listes.entrouvert.com/arc/lasso/2024-01/msg00000.html>
+
+diff --git a/lasso/lasso.c b/lasso/lasso.c
+index 42b7d6bb2392525e..bc75f5e674b5e657 100644
+--- a/lasso/lasso.c
++++ b/lasso/lasso.c
+@@ -138,7 +138,13 @@ DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
+ #include "types.c"
+ 
+ static void
+-lasso_xml_structured_error_func(G_GNUC_UNUSED void *user_data, xmlErrorPtr error)
++lasso_xml_structured_error_func(G_GNUC_UNUSED void *user_data,
++#if LIBXML_VERSION >= 21200
++                                        const xmlError *error
++#else
++                                        xmlErrorPtr error
++#endif
++				)
+ {
+ 	g_log("libxml2", G_LOG_LEVEL_DEBUG, "libxml2: %s", error->message);
+ }
+diff --git a/lasso/xml/tools.c b/lasso/xml/tools.c
+index bbc87d9f1e7eb20d..4d5fa78a28222f1a 100644
+--- a/lasso/xml/tools.c
++++ b/lasso/xml/tools.c
+@@ -1450,7 +1450,14 @@ lasso_concat_url_query(const char *url, const char *query)
+ 	}
+ }
+ 
+-static void structuredErrorFunc (void *userData, xmlErrorPtr error) {
++static void structuredErrorFunc (void *userData,
++#if LIBXML_VERSION >= 21200
++                                        const xmlError *error
++#else
++                                        xmlErrorPtr error
++#endif
++				 )
++{
+ 		*(int*)userData = error->code;
+ }
+ 

lasso.spec

@@ -64,7 +64,11 @@
   %global configure_args %{configure_args} --enable-wsf --with-sasl2=%{_prefix}/sasl2
 %endif
 
-%if !%{with_python}
+%if %{with_python}
+  %if 0%{?fedora} || 0%{?rhel} > 7
+BuildRequires: (python3-setuptools if python3 >= 3.12)
+  %endif
+%else
   %global configure_args %{configure_args} --disable-python
 %endif
 
@@ -72,13 +76,14 @@
 Summary: Liberty Alliance Single Sign On
 Name: lasso
 Version: 2.8.2
-Release: 7%{?dist}
+Release: 8%{?dist}
 License: GPLv2+
 URL: https://lasso.entrouvert.org/
 Source: https://dev.entrouvert.org/lasso/lasso-%{version}.tar.gz
 
 Patch01: fix-removed-xmlsec-deprecations.patch
 Patch02: fix-openssl-implicit-declarations.patch
+Patch3: lasso-libxml2.patch
 
 BuildRequires: autoconf
 BuildRequires: automake
@@ -328,6 +333,10 @@ rm -fr %{buildroot}%{_defaultdocdir}/%{name}
 %endif
 
 %changelog
+* Sun Jan 21 2024 Florian Weimer <fweimer@redhat.com> - 2.8.2-8
+- libxml2 2.12 fix for incompatible-pointer-types errors
+- Add conditional BuildRequires: on python3-setuptools for unbundled distutils
+
 * Sun Jan 21 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.8.2-7
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild