llvm-core/clang-linker-config: New package

Provide a new package which creates a partial clang config file
`/etc/clang/${LLVM_VERSION}/gentoo-linker.cfg`, used to control the
default linker used by clang.

Signed-off-by: Michal Rostecki <vadorovsky@protonmail.com>
Closes: https://bugs.gentoo.org/951445
Part-of: https://github.com/gentoo/gentoo/pull/42663
Signed-off-by: Michał Górny <mgorny@gentoo.org>
Part-of: https://github.com/gentoo/gentoo/pull/42663
Signed-off-by: Michał Górny <mgorny@gentoo.org>

llvm-core/clang-linker-config/clang-linker-config-20.ebuild

@@ -0,0 +1,28 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="Default linker configuration for clang"
+HOMEPAGE="https://clang.llvm.org/"
+S=${WORKDIR}
+
+LICENSE="public-domain"
+SLOT="${PV}"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86 ~amd64-linux ~arm64-macos ~ppc-macos ~x64-macos"
+IUSE="default-lld"
+
+RDEPEND="
+	default-lld? ( llvm-core/lld:${PV} )
+	!default-lld? ( sys-devel/binutils )
+"
+
+src_install() {
+	insinto "/etc/clang/${SLOT}"
+	newins - gentoo-linker.cfg <<-EOF
+		# This file is initially generated by ${CATEGORY}/${PN}.
+		# It is used to control the default linker used by clang.
+
+		-fuse-ld=$(usex default-lld lld bfd)
+	EOF
+}

llvm-core/clang-linker-config/clang-linker-config-21.ebuild

@@ -0,0 +1,28 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="Default linker configuration for clang"
+HOMEPAGE="https://clang.llvm.org/"
+S=${WORKDIR}
+
+LICENSE="public-domain"
+SLOT="${PV}"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86 ~amd64-linux ~arm64-macos ~ppc-macos ~x64-macos"
+IUSE="default-lld"
+
+RDEPEND="
+	default-lld? ( llvm-core/lld:${PV} )
+	!default-lld? ( sys-devel/binutils )
+"
+
+src_install() {
+	insinto "/etc/clang/${SLOT}"
+	newins - gentoo-linker.cfg <<-EOF
+		# This file is initially generated by ${CATEGORY}/${PN}.
+		# It is used to control the default linker used by clang.
+
+		-fuse-ld=$(usex default-lld lld bfd)
+	EOF
+}

llvm-core/clang-linker-config/clang-linker-config-22.ebuild

@@ -0,0 +1,27 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="Default linker configuration for clang"
+HOMEPAGE="https://clang.llvm.org/"
+S=${WORKDIR}
+
+LICENSE="public-domain"
+SLOT="${PV}"
+IUSE="default-lld"
+
+RDEPEND="
+	default-lld? ( llvm-core/lld:${PV} )
+	!default-lld? ( sys-devel/binutils )
+"
+
+src_install() {
+	insinto "/etc/clang/${SLOT}"
+	newins - gentoo-linker.cfg <<-EOF
+		# This file is initially generated by ${CATEGORY}/${PN}.
+		# It is used to control the default linker used by clang.
+
+		-fuse-ld=$(usex default-lld lld bfd)
+	EOF
+}

llvm-core/clang-linker-config/metadata.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>vadorovsky@protonmail.com</email>
+		<name>Michal Rostecki</name>
+	</maintainer>
+	<maintainer type="project">
+		<email>llvm@gentoo.org</email>
+	</maintainer>
+	<use>
+		<flag name="default-lld">Use lld as the default linker for clang</flag>
+	</use>
+	<upstream>
+		<remote-id type="github">llvm/llvm-project</remote-id>
+	</upstream>
+</pkgmetadata>

metadata/stabilization-groups/llvm.group

@@ -24,6 +24,7 @@ llvm-runtimes/libcxx
 llvm-runtimes/libgcc
 llvm-runtimes/openmp
 llvm-runtimes/offload
+llvm-core/clang-linker-config
 llvm-core/clang-runtime
 llvm-core/libclc
 llvm-runtimes/libatomic-stub