llvm-runtimes/clang-runtime: Use configuration ebuilds down to LLVM 16

Previously, we added clang-*-config ebuilds only for LLVM >= 20. To let
the old versions benefit from them, bakcport them to all major versions
down to 16.

Closes: https://bugs.gentoo.org/951445
Signed-off-by: Michal Rostecki <vadorovsky@protonmail.com>
Part-of: https://github.com/gentoo/gentoo/pull/43784
Signed-off-by: Sam James <sam@gentoo.org>

1 files changed, 122 insertions, 0 deletions

diff --git a/llvm-runtimes/clang-runtime/clang-runtime-16.0.6-r1.ebuild b/llvm-runtimes/clang-runtime/clang-runtime-16.0.6-r1.ebuild
new file mode 100644
index 000000000000..e0c95f42c40b
--- /dev/null
+++ b/llvm-runtimes/clang-runtime/clang-runtime-16.0.6-r1.ebuild
@@ -0,0 +1,122 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit multilib multilib-build toolchain-funcs
+
+DESCRIPTION="Meta-ebuild for clang runtime libraries"
+HOMEPAGE="https://clang.llvm.org/"
+
+LICENSE="metapackage"
+SLOT="${PV%%.*}"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~sparc ~x86 ~amd64-linux ~arm64-macos ~ppc-macos ~x64-macos"
+IUSE="+compiler-rt libcxx openmp +sanitize"
+REQUIRED_USE="sanitize? ( compiler-rt )"
+
+RDEPEND="
+	compiler-rt? (
+		~llvm-runtimes/compiler-rt-${PV}:${SLOT}[abi_x86_32(+)?,abi_x86_64(+)?]
+		sanitize? (
+			~llvm-runtimes/compiler-rt-sanitizers-${PV}:${SLOT}[abi_x86_32(+)?,abi_x86_64(+)?]
+		)
+	)
+	libcxx? ( >=llvm-runtimes/libcxx-${PV}[${MULTILIB_USEDEP}] )
+	openmp? ( >=llvm-runtimes/openmp-${PV}[${MULTILIB_USEDEP}] )
+
+	llvm-core/clang-common
+
+	~llvm-core/clang-linker-config-${SLOT}
+	~llvm-runtimes/clang-rtlib-config-${SLOT}
+	~llvm-runtimes/clang-unwindlib-config-${SLOT}
+	~llvm-runtimes/clang-stdlib-config-${SLOT}
+"
+
+pkg_pretend() {
+	if tc-is-clang; then
+		ewarn "You seem to be using clang as a system compiler.  As of clang-16,"
+		ewarn "upstream has turned a few warnings that commonly occur during"
+		ewarn "configure script runs into errors by default.  This causes some"
+		ewarn "configure tests to start failing, sometimes resulting in silent"
+		ewarn "breakage, missing functionality or runtime misbehavior.  It is"
+		ewarn "not yet clear whether the change will remain or be reverted."
+		ewarn
+		ewarn "For more information, please see:"
+		ewarn "https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213"
+	fi
+}
+
+_doclang_cfg() {
+	local triple="${1}"
+
+	local tool
+	for tool in ${triple}-clang{,++,-cpp}; do
+		newins - "${tool}.cfg" <<-EOF
+			# This configuration file is used by ${tool} driver.
+			@../${tool}.cfg
+			@gentoo-plugins.cfg
+			@gentoo-runtimes.cfg
+		EOF
+	done
+
+	# Install symlinks for triples with other vendor strings since some
+	# programs insist on mangling the triple.
+	local vendor
+	for vendor in gentoo pc unknown; do
+		local vendor_triple="${triple%%-*}-${vendor}-${triple#*-*-}"
+		for tool in clang{,++,-cpp}; do
+			if [[ ! -f "${ED}/etc/clang/${SLOT}/${vendor_triple}-${tool}.cfg" ]]; then
+				dosym "${triple}-${tool}.cfg" "/etc/clang/${SLOT}/${vendor_triple}-${tool}.cfg"
+			fi
+		done
+	done
+}
+
+doclang_cfg() {
+	local triple=$(get_abi_CHOST "${abi}")
+
+	_doclang_cfg ${triple}
+
+	# LLVM may have different arch names in some cases. For example in x86
+	# profiles the triple uses i686, but llvm will prefer i386 if invoked
+	# with "clang" on x86 or "clang -m32" on x86_64. The gentoo triple will
+	# be used if invoked through ${CHOST}-clang{,++,-cpp} though.
+	#
+	# To make sure the correct triples are installed,
+	# see Triple::getArchTypeName() in llvm/lib/TargetParser/Triple.cpp
+	# and compare with CHOST values in profiles.
+
+	local abi=${triple%%-*}
+	case ${abi} in
+		armv4l|armv4t|armv5tel|armv6j|armv7a)
+			_doclang_cfg ${triple/${abi}/arm}
+			;;
+		i686)
+			_doclang_cfg ${triple/${abi}/i386}
+			;;
+		sparc)
+			_doclang_cfg ${triple/${abi}/sparcel}
+			;;
+		sparc64)
+			_doclang_cfg ${triple/${abi}/sparcv9}
+			;;
+	esac
+}
+
+src_install() {
+	insinto "/etc/clang/${SLOT}"
+	newins - gentoo-runtimes.cfg <<-EOF
+		# This file is initially generated by llvm-runtimes/clang-runtime.
+		# It is used to control the default runtimes using by clang.
+
+		@gentoo-rtlib.cfg
+		@gentoo-unwindlib.cfg
+		@gentoo-stdlib.cfg
+		@gentoo-linker.cfg
+	EOF
+	newins - gentoo-plugins.cfg <<-EOF
+		# This file is used to load optional LLVM plugins.
+	EOF
+
+	multilib_foreach_abi doclang_cfg
+}