# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

ROCM_VERSION=${PV}
inherit cmake flag-o-matic rocm

DESCRIPTION="HIP parallel primitives for developing performant GPU-accelerated code on ROCm"
HOMEPAGE="https://github.com/ROCm/rocm-libraries/tree/develop/projects/rocprim"
# ROCm 10 component assets use therock tags; rocm tags end at 7.2.4.
SRC_URI="https://github.com/ROCm/rocm-libraries/releases/download/therock-$(ver_cut 1-2)/rocprim.tar.gz -> rocprim-${PV}.tar.gz"
S="${WORKDIR}/rocprim"

LICENSE="MIT"
SLOT="0/$(ver_cut 1-2)"
KEYWORDS="~amd64"
IUSE="benchmark test"
REQUIRED_USE="
	benchmark? ( ${ROCM_REQUIRED_USE} )
	test? ( ${ROCM_REQUIRED_USE} )
"

RDEPEND="
	benchmark? (
		dev-util/hip:${SLOT}
		dev-cpp/benchmark:=
	)
"
DEPEND="
	${RDEPEND}
	dev-util/hip:${SLOT}
	test? ( dev-cpp/gtest )
"
BDEPEND="dev-build/rocm-cmake:${SLOT}"

RESTRICT="!test? ( test )"

src_prepare() {
	# Install namespaced benchmark binaries.
	if use benchmark; then
		# Guard both sed anchors; otherwise collisions return or nothing installs.
		# verified 2026-08-30
		grep -q 'get_filename_component' benchmark/CMakeLists.txt ||
			die "get_filename_component anchor moved; benchmark names would not be namespaced"
		grep -q 'add_executable' benchmark/CMakeLists.txt ||
			die "add_executable anchor moved; benchmarks would build but never install"
		sed -e "/get_filename_component/s,\${BENCHMARK_SOURCE},${PN}_\${BENCHMARK_SOURCE}," \
			-e "/add_executable/a\  install(TARGETS \${BENCHMARK_TARGET})" -i benchmark/CMakeLists.txt || die
	fi

	cmake_src_prepare
}

src_configure() {
	rocm_use_clang

	append-cxxflags -Wno-explicit-specialization-storage-class -Wno-deprecated-declarations

	local mycmakeargs=(
		-DCMAKE_SKIP_RPATH=ON
		-DAMDGPU_TARGETS="$(get_amdgpu_flags)"
		-DBUILD_TEST=$(usex test ON OFF)
		-DBUILD_BENCHMARK=$(usex benchmark ON OFF)
		-DROCM_SYMLINK_LIBS=OFF
	)

	cmake_src_configure
}

src_test() {
	check_amdgpu
	# Use HMM to fit tests within default sub-512 MiB iGPU VRAM.
	ROCPRIM_USE_HMM="1" cmake_src_test -j1
}