dev-perl/XML-LibXML: fix modern C issues

Closes: https://bugs.gentoo.org/883711
Signed-off-by: Sam James <sam@gentoo.org>

dev-perl/XML-LibXML/XML-LibXML-2.20.800-r1.ebuild

@@ -0,0 +1,82 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DIST_AUTHOR=SHLOMIF
+DIST_VERSION=2.0208
+DIST_EXAMPLES=("example/*")
+inherit perl-module
+
+DESCRIPTION="Perl binding for libxml2"
+
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-macos"
+IUSE="minimal"
+
+# >= on XML-Sax needed to avoid "miscompilation" (essentially empty install), as newer XML-Sax
+# has the ROOT check fixed. Didn't happen with XML-SAX-Expat, but best to be careful.
+# bug #840053
+RDEPEND="
+	virtual/perl-Carp
+	virtual/perl-Encode
+	>=virtual/perl-Exporter-5.570.0
+	virtual/perl-IO
+	virtual/perl-Scalar-List-Utils
+	>=dev-perl/XML-NamespaceSupport-1.70.0
+	>=dev-perl/XML-SAX-1.20.0-r1
+	dev-perl/XML-SAX-Base
+	>=dev-libs/libxml2-2.6.21:2=
+	virtual/perl-parent
+"
+BDEPEND="${RDEPEND}
+	virtual/perl-ExtUtils-MakeMaker
+	dev-perl/Alien-Build
+	>=dev-perl/Alien-Libxml2-0.140.0
+	test? (
+		!minimal? (
+			dev-perl/Test-LeakTrace
+		)
+	)
+"
+DEPEND=">=dev-libs/libxml2-2.6.21:2="
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-2.20.800-modern-c.patch
+)
+
+PERL_RM_FILES=(
+	"t/cpan-changes.t" "t/pod-files-presence.t" "t/pod.t"
+	"t/release-kwalitee.t" "t/style-trailing-space.t"
+	"t/11memory.t"
+)
+
+src_compile() {
+	export SKIP_SAX_INSTALL=1
+	perl-module_src_compile
+}
+
+pkg_postinst() {
+	pkg_update_parser add XML::LibXML::SAX::Parser
+	pkg_update_parser add XML::LibXML::SAX
+}
+
+pkg_postrm() {
+	pkg_update_parser remove XML::LibXML::SAX::Parser
+	pkg_update_parser remove XML::LibXML::SAX
+}
+
+pkg_update_parser() {
+	# pkg_update_parser [add|remove] $parser_module
+	local action=$1
+	local parser_module=$2
+
+	if [[ -z "${ROOT}" ]] ; then
+		einfo "Update Parser: $1 $2"
+		perl -MXML::SAX -e "XML::SAX->${action}_parser(q(${parser_module}))->save_parsers()" \
+			|| ewarn "Update Parser: $1 $2 failed"
+	else
+		elog "To $1 $2 run:"
+		elog "perl -MXML::SAX -e 'XML::SAX->${action}_parser(q(${parser_module}))->save_parsers()'"
+	fi
+}

dev-perl/XML-LibXML/files/XML-LibXML-2.20.800-modern-c.patch

@@ -0,0 +1,45 @@
+https://bugs.gentoo.org/883711
+https://github.com/shlomif/perl-XML-LibXML/pull/75
+
+From 25451c0a56ef8d3b32fd23847bef516486bd8ed4 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Mon, 16 Jan 2023 18:50:10 -0800
+Subject: [PATCH] libxml-mm: Fix function prototypes in function pointers
+
+This is now detected with latest clang16+
+
+Fixes
+error: incompatible function pointer types passing 'void (void *, void *, xmlChar *)' (aka 'void (void *, void *, unsigned char *)') to parameter of type 'xmlHashScanner' (aka 'void (*)(void *, void *, const unsigned char *)') [-Wincompatible-function-pointer-types]
+                xmlHashScan(r, PmmRegistryDumpHashScanner, NULL);
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+--- a/perl-libxml-mm.c
++++ b/perl-libxml-mm.c
+@@ -121,7 +121,7 @@ PmmFreeHashTable(xmlHashTablePtr table)
+ extern SV* PROXY_NODE_REGISTRY_MUTEX;
+ 
+ /* Utility method used by PmmDumpRegistry */
+-void PmmRegistryDumpHashScanner(void * payload, void * data, xmlChar * name)
++void PmmRegistryDumpHashScanner(void * payload, void * data, const xmlChar * name)
+ {
+ 	LocalProxyNodePtr lp = (LocalProxyNodePtr) payload;
+ 	ProxyNodePtr node = (ProxyNodePtr) lp->proxy;
+@@ -215,7 +215,7 @@ PmmRegisterProxyNode(ProxyNodePtr proxy)
+ /* PP: originally this was static inline void, but on AIX the compiler
+    did not chew it, so I'm removing the inline */
+ static void
+-PmmRegistryHashDeallocator(void *payload, xmlChar *name)
++PmmRegistryHashDeallocator(void *payload, const xmlChar *name)
+ {
+ 	Safefree((LocalProxyNodePtr) payload);
+ }
+@@ -279,7 +279,7 @@ PmmRegistryREFCNT_dec(ProxyNodePtr proxy)
+  * internal, used by PmmCloneProxyNodes
+  */
+ void *
+-PmmRegistryHashCopier(void *payload, xmlChar *name)
++PmmRegistryHashCopier(void *payload, const xmlChar *name)
+ {
+ 	ProxyNodePtr proxy = ((LocalProxyNodePtr) payload)->proxy;
+ 	LocalProxyNodePtr lp;
+