dev-libs/cereal: fix build with recent clang, unbundle doctest

Now builds & passes tests with gcc-16 & clang-22.

Bug: https://bugs.gentoo.org/792444
Closes: https://bugs.gentoo.org/946812
Signed-off-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Part-of: https://codeberg.org/gentoo/gentoo/pulls/1199
Signed-off-by: Sam James <sam@gentoo.org>

dev-libs/cereal/cereal-1.3.2-r4.ebuild

@@ -0,0 +1,60 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+DESCRIPTION="Header-only C++11 serialization library"
+HOMEPAGE="https://uscilab.github.io/cereal/"
+SRC_URI="https://github.com/USCiLab/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="amd64 ~arm arm64 ~loong ~ppc64 ~riscv x86"
+IUSE="doc test"
+RESTRICT="!test? ( test )"
+
+BDEPEND="doc? ( app-text/doxygen )
+	test? ( dev-cpp/doctest )
+"
+DEPEND="dev-libs/rapidjson"
+RDEPEND="${DEPEND}"
+
+PATCHES=( "${FILESDIR}"/1.3.2-clang-tuple.patch )
+
+src_prepare() {
+	if ! use doc ; then
+		cmake_comment_add_subdirectory doc
+	fi
+
+	# remove bundled rapidjson (bug 792444)
+	# rapidxml cannot be unbundled easily, see the bug for details.
+	rm -r include/cereal/external/rapidjson || die 'could not remove bundled rapidjson'
+	sed -e '/rapidjson/s|cereal/external/||' \
+		-e 's/CEREAL_RAPIDJSON_NAMESPACE/rapidjson/g' \
+		-i include/cereal/archives/json.hpp || die
+
+	# remove bundled doctest
+	rm unittests/doctest.h || die 'could not remove bundled doctest'
+	sed -e 's/\"doctest\.h\"/<doctest\/doctest.h>/g' \
+		-i unittests/common.hpp || die
+
+	cmake_src_prepare
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DBUILD_TESTS=$(usex test)
+
+		# Avoid Boost dependency
+		-DSKIP_PERFORMANCE_COMPARISON=ON
+
+		-DWITH_WERROR=OFF
+	)
+
+	# TODO: Enable if multilib?
+	use test && mycmakeargs+=( -DSKIP_PORTABILITY_TEST=ON )
+
+	cmake_src_configure
+}

dev-libs/cereal/files/1.3.2-clang-tuple.patch

@@ -0,0 +1,34 @@
+https://bugs.gentoo.org/946812
+https://github.com/USCiLab/cereal/issues/852
+https://github.com/USCiLab/cereal/pull/872
+
+From: nindanaoto <matsuoka.kotaro@gmail.com>
+Date: Sun, 14 Sep 2025 11:02:03 +0000
+Subject: [PATCH] Fix llvm20 compile issue in tuple.hpp
+
+---
+ include/cereal/types/tuple.hpp | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/cereal/types/tuple.hpp b/include/cereal/types/tuple.hpp
+index 80c68075..d6bef110 100644
+--- a/include/cereal/types/tuple.hpp
++++ b/include/cereal/types/tuple.hpp
+@@ -95,7 +95,7 @@ namespace cereal
+       template <class Archive, class ... Types> inline
+       static void apply( Archive & ar, std::tuple<Types...> & tuple )
+       {
+-        serialize<Height - 1>::template apply( ar, tuple );
++        serialize<Height - 1>::template apply<Archive, Types...>( ar, tuple );
+         ar( CEREAL_NVP_(tuple_element_name<Height - 1>::c_str(),
+             std::get<Height - 1>( tuple )) );
+       }
+@@ -116,7 +116,7 @@ namespace cereal
+   template <class Archive, class ... Types> inline
+   void CEREAL_SERIALIZE_FUNCTION_NAME( Archive & ar, std::tuple<Types...> & tuple )
+   {
+-    tuple_detail::serialize<std::tuple_size<std::tuple<Types...>>::value>::template apply( ar, tuple );
++    tuple_detail::serialize<std::tuple_size<std::tuple<Types...>>::value>::template apply<Archive, Types...>( ar, tuple );
+   }
+ } // namespace cereal
+