[dev-util/include-what-you-use] add IWYU for clang 20

dev-util/include-what-you-use/Manifest

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+DIST include-what-you-use-0.24.tar.gz 821159 BLAKE2B 191d0299c0b5ad6ed75cb24b5530fe606dc6a9ddb91b8d1667ba6f5b909498354b7565e0ebafbfd56eb6e1c4e1c1cf885a0d08b8584d33fae34c4dcbde92ff65 SHA512 62d26a0e646cb6d94d5dee8d672009b938fdcfe64c5c6086693295e90d858754d9a6706b063ddc2cfe5660181df2722a4becfb56285b8cfc6d60f88f729924b7

dev-util/include-what-you-use/include-what-you-use-0.24.ebuild

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+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{11..13} )
+LLVM_COMPAT=( 20 )
+
+inherit cmake llvm-r1 python-single-r1
+
+DESCRIPTION="Find unused include directives in C/C++ programs"
+HOMEPAGE="https://include-what-you-use.org/"
+SRC_URI="
+	https://github.com/${PN}/${PN}/archive/${PV}.tar.gz
+		-> ${P}.tar.gz
+"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~arm64 ~x86"
+
+RDEPEND="
+	$(llvm_gen_dep '
+		llvm-core/clang:${LLVM_SLOT}=
+		llvm-core/llvm:${LLVM_SLOT}=
+	')
+	${PYTHON_DEPS}
+"
+DEPEND="${RDEPEND}"
+
+REQUIRED_USE="${PYTHON_REQUIRED_USE}"
+
+pkg_setup() {
+	llvm-r1_pkg_setup
+	python-single-r1_pkg_setup
+}
+
+src_prepare() {
+	cmake_src_prepare
+	python_fix_shebang .
+}
+
+src_configure() {
+	local mycmakeargs=(
+		# Note [llvm install path]
+		# Unfortunately all binaries using clang driver
+		# have to reside at the same path depth as
+		# 'clang' binary itself. See bug #625972
+		# Thus as a hack we install it to the same directory
+		# as llvm/clang itself.
+		-DCMAKE_INSTALL_PREFIX="$(get_llvm_prefix)"
+		# Relative path to the clang library
+		# https://github.com/include-what-you-use/include-what-you-use/commit/e046d23571876e72719ef96a36ff0cb1cb2e64b6
+		-DIWYU_RESOURCE_DIR="../../../clang/${LLVM_SLOT}"
+	)
+	cmake_src_configure
+}
+
+src_test() {
+	"${EPYTHON}" run_iwyu_tests.py \
+				 -- "${BUILD_DIR}"/bin/${PN} \
+		|| die "Tests failed with $? (using ${EPYTHON})"
+}

dev-util/include-what-you-use/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type='person'>
+		<email>flow@gentoo.org</email>
+		<name>Florian Schmaus</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">include-what-you-use/include-what-you-use</remote-id>
+	</upstream>
+</pkgmetadata>