dev-cpp/eigen: add 3.4.0-r2, 3.4.9999, 9999 with fixed cuda tests

Automatically detects working compiler.
Automatically detects host CUDA arch, can be overriden by setting CUDAARCHS env var.

Signed-off-by: Paul Zander <negril.nx+gentoo@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/34547
Signed-off-by: Sam James <sam@gentoo.org>

9 files changed, 1472 insertions, 0 deletions

diff --git a/dev-cpp/eigen/Manifest b/dev-cpp/eigen/Manifest
index 3955c4711b20..02571f1672eb 100644
--- a/dev-cpp/eigen/Manifest
+++ b/dev-cpp/eigen/Manifest
@@ -1 +1,3 @@
+DIST eigen-3.4.0.tar.bz2 2143091 BLAKE2B a32aac13cbab68cfaaa252d8a406e6a36ecfd1239361412b1f9baa08284a94467479c08ffae10cb847e9916472b46b1c1af4efbf81f957c8200a4379acd42c42 SHA512 cc488eb111e0e248744d2bc4475b345b5fb82361dff226a5b73a33bd0388de8c219cff8cffcf8f476b672fc0e223f339e8c6a1cfb6293840a4a6abf232438a89
 DIST eigen-3.4.0.tar.gz 2705005 BLAKE2B ae5f774a6ed36f52cf9fc3206e50796abacbba69fd0f67cd5759b4e04d847aa656861d5e06e6cd0d798a17f2b06abdb70b16f795a626bdd29edcc872c33821f8 SHA512 ba75ecb760e32acf4ceaf27115468e65d4f77c44f8d519b5a13e7940af2c03a304ad433368cb6d55431f307c5c39e2666ab41d34442db3cf441638e51f5c3b6a
+DIST eigen-lapack_addons-3.4.1.tgz 6215074 BLAKE2B 564c3398de1f4ea249b58957a482cda0b5eb99e5021e1f18abf3b4d2893fed48912bfa8386681fcae03dd933eea91644f7429d47a53684d64462209a6ae76f30 SHA512 5a827d0befb521cb430f0d63f5000e7955359bc637cdb7292d942712e98c0702570a5b650a72fc609bf5b43633661c0e51de7761ae892df6ff0aab667f436edf
diff --git a/dev-cpp/eigen/eigen-3.4.0-r2.ebuild b/dev-cpp/eigen/eigen-3.4.0-r2.ebuild
new file mode 100644
index 000000000000..a8b79d254d1b
--- /dev/null
+++ b/dev-cpp/eigen/eigen-3.4.0-r2.ebuild
@@ -0,0 +1,432 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+FORTRAN_NEEDED="test"
+inherit cmake cuda fortran-2 llvm toolchain-funcs
+
+DESCRIPTION="C++ template library for linear algebra"
+HOMEPAGE="https://eigen.tuxfamily.org/index.php?title=Main_Page"
+
+if [[ ${PV} = *9999* ]] ; then
+	inherit git-r3
+	EGIT_REPO_URI="https://gitlab.com/lib${PN}/${PN}.git"
+	if [[ ${PV} = 3.4.9999* ]] ; then
+		EGIT_COMMIT="3.4"
+	fi
+else
+	SRC_URI="
+		https://gitlab.com/lib${PN}/${PN}/-/archive/${PV}/${P}.tar.bz2
+		test? ( lapack? ( https://downloads.tuxfamily.org/${PN}/lapack_addons_3.4.1.tgz -> ${PN}-lapack_addons-3.4.1.tgz ) )
+	"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~x64-macos"
+fi
+
+LICENSE="MPL-2.0"
+SLOT="3"
+
+# The following lines are shamelessly stolen from ffmpeg-9999.ebuild with modifications
+ARM_CPU_FEATURES=(
+	neon:NEON
+)
+PPC_CPU_FEATURES=(
+	altivec:ALTIVEC
+	vsx:VSX
+)
+X86_CPU_FEATURES=(
+	avx:AVX
+	avx2:AVX2
+	avx512f:AVX512
+	avx512dq:AVX512DQ
+	f16c:FP16C
+	fma3:FMA
+	popcnt:POPCNT
+	sse:SSE
+	sse2:SSE2
+	sse3:SSE3
+	ssse3:SSSE3
+	sse4_1:SSE4_1
+	sse4_2:SSE4_2
+)
+# MIPS_CPU_FEATURES=(
+# 	msa:MSA
+# )
+# S390_CPU_FEATURES=(
+# 	z13:Z13
+# 	z14:Z14
+# )
+
+CPU_FEATURES_MAP=(
+	${ARM_CPU_FEATURES[@]/#/cpu_flags_arm_}
+	${PPC_CPU_FEATURES[@]/#/cpu_flags_ppc_}
+	${X86_CPU_FEATURES[@]/#/cpu_flags_x86_}
+	# ${MIPS_CPU_FEATURES[@]/#/cpu_flags_mips_}
+	# ${S390_CPU_FEATURES[@]/#/cpu_flags_s390_}
+)
+
+IUSE_TEST_BACKENDS=(
+	"adolc"
+	"boost"
+	"cholmod"
+	"fftw"
+	"klu"
+	"opengl"
+	"openmp"
+	"pastix"
+	"sparsehash"
+	"spqr"
+	"superlu"
+	"umfpack"
+)
+
+IUSE="${CPU_FEATURES_MAP[*]%:*} clang cuda hip debug doc lapack test ${IUSE_TEST_BACKENDS[*]}" #zvector
+
+# Tests failing again because of compiler issues
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	doc? (
+		app-doc/doxygen[dot]
+		dev-texlive/texlive-bibtexextra
+		dev-texlive/texlive-fontsextra
+		dev-texlive/texlive-fontutils
+		dev-texlive/texlive-latex
+		dev-texlive/texlive-latexextra
+	)
+	test? ( virtual/pkgconfig )
+"
+
+# METIS
+# MPREAL
+# dev-libs/mpfr:0
+# dev-libs/gmp:0
+
+TEST_BACKENDS="
+		boost? ( dev-libs/boost )
+		adolc? ( sci-libs/adolc[sparse] )
+		cholmod? ( sci-libs/cholmod:= )
+		fftw? ( sci-libs/fftw )
+		spqr? ( sci-libs/spqr )
+		klu? ( sci-libs/klu )
+		opengl? (
+			media-libs/freeglut
+			media-libs/glew
+			media-libs/libglvnd
+		)
+		pastix? ( sci-libs/pastix[-mpi] )
+		sparsehash? (
+			amd64? ( dev-cpp/sparsehash )
+			arm64? ( dev-cpp/sparsehash )
+			ppc64? ( dev-cpp/sparsehash )
+			x86?   ( dev-cpp/sparsehash )
+		)
+		superlu? ( sci-libs/superlu )
+		umfpack? ( sci-libs/umfpack )
+"
+DEPEND="
+	test? (
+		cuda? (
+			!clang? (
+				dev-util/nvidia-cuda-toolkit
+			)
+			clang? (
+				sys-devel/clang[llvm_targets_NVPTX]
+				openmp? ( sys-libs/libomp[llvm_targets_NVPTX,offload] )
+			)
+		)
+		hip? ( dev-util/hip )
+		lapack? ( virtual/lapacke )
+		${TEST_BACKENDS}
+	)
+"
+
+REQUIRED_USE="
+	test? ( !lapack )
+	|| ( ${IUSE_TEST_BACKENDS[*]} )
+"
+
+PATCHES=(
+	"${FILESDIR}/${PN}-3.3.9-max-macro.patch"
+	"${FILESDIR}/${PN}-3.4.0-doc-nocompress.patch" # bug 830064
+	"${FILESDIR}/${PN}-3.4.0-buildstring.patch"
+	"${FILESDIR}/${PN}-3.4.0-noansi.patch"
+	"${FILESDIR}/${PN}-3.4.0-cxxstandard.patch"
+)
+
+# TODO should be in cuda.eclass
+cuda_set_CUDAHOSTCXX() {
+	local compiler
+	tc-is-gcc && compiler="gcc"
+	tc-is-clang && compiler="clang"
+	[[ -z "$compiler" ]] && die "no compiler specified"
+
+	local package="sys-devel/${compiler}"
+	local version="${package}"
+	local CUDAHOSTCXX_test
+	while
+		CUDAHOSTCXX="${CUDAHOSTCXX_test}"
+		version=$(best_version "${version}")
+		if [[ -z "${version}" ]]; then
+			if [[ -z "${CUDAHOSTCXX}" ]]; then
+				die "could not find supported version of ${package}"
+			fi
+			break
+		fi
+		CUDAHOSTCXX_test="$(
+			dirname "$(
+				realpath "$(
+					which "${compiler}-$(echo "${version}" | grep -oP "(?<=${package}-)[0-9]*")"
+				)"
+			)"
+		)"
+		version="<${version}"
+	do ! echo "int main(){}" | nvcc "-ccbin ${CUDAHOSTCXX_test}" - -x cu &>/dev/null; done
+
+	export CUDAHOSTCXX
+}
+
+src_unpack() {
+	if [[ ${PV} = *9999* ]] ; then
+		git-r3_src_unpack
+	else
+		unpack "${P}.tar.bz2"
+
+		if use test && use lapack; then
+			cd "${S}/lapack" || die
+			unpack "${PN}-lapack_addons-3.4.1.tgz"
+		fi
+	fi
+}
+
+src_prepare() {
+	cmake_src_prepare
+
+	cmake_comment_add_subdirectory demos
+
+	if ! use test; then
+		sed -e "/add_subdirectory(test/s/^/#DONOTCOMPILE /g" \
+			-e "/add_subdirectory(blas/s/^/#DONOTCOMPILE /g" \
+			-e "/add_subdirectory(lapack/s/^/#DONOTCOMPILE /g" \
+			-i CMakeLists.txt || die
+	fi
+
+}
+
+src_configure() {
+	if use test; then
+		mycmakeargs+=(
+			# the OpenGL testsuite is extremely brittle, bug #712808
+			-DOpenGL_GL_PREFERENCE="GLVND"
+			-DEIGEN_TEST_OPENGL="$(usex opengl)" # Enable OpenGL support in unit tests
+			-DEIGEN_TEST_OPENMP="$(usex openmp)" # Enable/Disable OpenMP in tests/examples
+
+			# needs Qt4
+			-DEIGEN_TEST_NOQT=yes # Disable Qt support in unit tests
+
+			-DCMAKE_DISABLE_FIND_PACKAGE_MPREAL=ON
+
+			-DEIGEN_TEST_CXX11=yes
+
+			# -DEIGEN_TEST_CUSTOM_CXX_FLAGS= # Additional compiler flags when compiling unit tests.
+			# -DEIGEN_TEST_CUSTOM_LINKER_FLAGS= # Additional linker flags when linking unit tests.
+			# -DEIGEN_TEST_BUILD_FLAGS= # Options passed to the build command of unit tests
+
+			# -DEIGEN_BUILD_BTL=yes # Build benchmark suite
+
+			# -DEIGEN_INTERNAL_DOCUMENTATION=no # Build internal documentation
+			# -DEIGEN_BUILD_DOC=yes # Enable creation of Eigen documentation
+			# -DEIGEN_BUILD_PKGCONFIG=yes # Build pkg-config .pc file for Eigen
+			# -DEIGEN_DOC_USE_MATHJAX=yes # Use MathJax for rendering math in HTML docs
+
+			-DEIGEN_TEST_BUILD_DOCUMENTATION="$(usex doc)" # Test building the doxygen documentation
+
+			# -DEIGEN_COVERAGE_TESTING=no # Enable/disable gcov
+			# -DEIGEN_CTEST_ERROR_EXCEPTION= # Regular expression for build error messages to be filtered out
+			# -DEIGEN_DEBUG_ASSERTS=no # Enable advanced debugging of assertions
+			# -DEIGEN_NO_ASSERTION_CHECKING=no # Disable checking of assertions using exceptions
+			# -DEIGEN_TEST_NO_EXCEPTIONS=no # Disables C++ exceptions
+			# -DEIGEN_TEST_NO_EXPLICIT_ALIGNMENT=no # Disable explicit alignment (hence vectorization) in tests/examples
+			# -DEIGEN_TEST_NO_EXPLICIT_VECTORIZATION=no # Disable explicit vectorization in tests/examples
+
+			# -DEIGEN_DASHBOARD_BUILD_TARGET=buildtests # Target to be built in dashboard mode, default is buildtests
+
+			# -DEIGEN_DEFAULT_TO_ROW_MAJOR=no # Use row-major as default matrix storage order
+
+			# -DEIGEN_TEST_MATRIX_DIR=yes # Enable testing of realword sparse matrices contained in the specified path
+			# -DEIGEN_TEST_MAX_SIZE=320 # Maximal matrix/vector size, default is 320
+			# -DEIGEN_SPLIT_LARGE_TESTS=no # Split large tests into smaller executables
+		)
+
+		use !adolc      && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_Adolc="TRUE" )
+		use !boost      && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_Boost="TRUE" )
+		use !cholmod    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_CHOLMOD="TRUE" )
+		use !fftw       && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_FFTW="TRUE" )
+		use !sparsehash && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_GoogleHash="TRUE" )
+		use !klu        && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_KLU="TRUE" )
+		use !opengl     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_OpenGL="TRUE" )
+		use !openmp     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_OpenMP="TRUE" )
+		use !pastix     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_PASTIX="TRUE" )
+		use !spqr       && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_SPQR="TRUE" )
+		use !superlu    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_SuperLU="TRUE" )
+		use !umfpack    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_UMFPACK="TRUE" )
+
+		if use lapack; then
+			mycmakeargs+=(
+				-DEIGEN_ENABLE_LAPACK_TESTS=yes
+				-DEIGEN_TEST_EXTERNAL_BLAS=yes # Use external BLAS library for testsuite
+				-DCMAKE_DISABLE_FIND_PACKAGE_SuperLU=ON
+			)
+		fi
+
+		if use arm; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_NEON="$(usex cpu_flags_arm_neon)"
+			)
+		fi
+
+		if use arm64; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_NEON64="$(usex cpu_flags_arm_neon)"
+			)
+		fi
+
+		if use ppc || use ppc64; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_ALTIVEC="$(usex cpu_flags_ppc_altivec)"
+				-DEIGEN_TEST_VSX="$(usex cpu_flags_ppc_vsx)"
+			)
+		fi
+
+		if use amd64 || use x86; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_32BIT=no # Force generating 32bit code.
+				# -DEIGEN_TEST_X87=no # Force using X87 instructions. Implies no vectorization.
+				-DEIGEN_TEST_SSE2="$(usex cpu_flags_x86_sse2)"
+				-DEIGEN_TEST_SSE3="$(usex cpu_flags_x86_sse3)"
+				-DEIGEN_TEST_SSSE3="$(usex cpu_flags_x86_ssse3)"
+				-DEIGEN_TEST_FMA="$(usex cpu_flags_x86_fma3)"
+				-DEIGEN_TEST_SSE4_1="$(usex cpu_flags_x86_sse4_1)"
+				-DEIGEN_TEST_SSE4_2="$(usex cpu_flags_x86_sse4_2)"
+				-DEIGEN_TEST_AVX="$(usex cpu_flags_x86_avx)"
+				-DEIGEN_TEST_F16C="$(usex cpu_flags_x86_f16c)"
+				-DEIGEN_TEST_AVX2="$(usex cpu_flags_x86_avx2)"
+				-DEIGEN_TEST_AVX512="$(usex cpu_flags_x86_avx512f)"
+				-DEIGEN_TEST_AVX512DQ="$(usex cpu_flags_x86_avx512dq)"
+			)
+		fi
+
+		if use mips; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_MSA=no # Enable/Disable MSA in tests/examples
+			)
+		fi
+
+		if use s390; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_Z13=no # Enable/Disable S390X(zEC13) ZVECTOR in tests/examples
+				# -DEIGEN_TEST_Z14=no # Enable/Disable S390X(zEC14) ZVECTOR in tests/examples
+			)
+		fi
+
+		mycmakeargs+=(
+			-DEIGEN_TEST_CUDA="$(usex cuda)" # Enable CUDA support in unit tests
+			-DEIGEN_TEST_CUDA_CLANG="$(usex cuda "$(usex clang)")" # Use clang instead of nvcc to compile the CUDA tests
+
+			-DEIGEN_TEST_HIP="$(usex hip)" # Add HIP support.
+
+			# -DEIGEN_TEST_SYCL=no # Add Sycl support.
+			# -DEIGEN_SYCL_TRISYCL=no # Use the triSYCL Sycl implementation (ComputeCPP by default).
+		)
+
+		if use cuda; then
+			cuda_add_sandbox -w
+			export CUDAFLAGS="${NVCCFLAGS}"
+			if use clang; then
+				local llvm_prefix
+				llvm_prefix="$(get_llvm_prefix -b)"
+				export CC="${llvm_prefix}/bin/clang"
+				export CXX="${llvm_prefix}/bin/clang++"
+			else
+				cuda_set_CUDAHOSTCXX
+				mycmakeargs+=(
+					-DCUDA_HOST_COMPILER="${CUDAHOSTCXX}"
+				)
+			fi
+			if [[ "${CUDA_VERBOSE}" == true ]]; then
+				mycmakeargs+=(
+					-DCUDA_VERBOSE_BUILD=yes
+				)
+				NVCCFLAGS+=" -v"
+			fi
+
+			[[ -z "${CUDAARCHS}" ]] && einfo "trying to determine host CUDAARCHS"
+			: "${CUDAARCHS:=$(__nvcc_device_query)}"
+			export CUDAARCHS
+
+			mycmakeargs+=(
+				-DEIGEN_CUDA_COMPUTE_ARCH="${CUDAARCHS}"
+			)
+		fi
+	fi
+
+	cmake_src_configure
+}
+
+src_compile() {
+	local targets=()
+	if use doc; then
+		targets+=( doc )
+		HTML_DOCS=( "${BUILD_DIR}"/doc/html/. )
+	fi
+	if use test; then
+		targets+=( buildtests )
+		if ! use lapack; then
+			targets+=( blas )
+		fi
+		# tests generate random data, which
+		# obviously fails for some seeds
+		export EIGEN_SEED=712808
+	fi
+
+	if use doc || use test; then
+		cmake_src_compile "${targets[@]}"
+	fi
+}
+
+src_test() {
+	CMAKE_SKIP_TESTS=(
+		product_small_32           #  143 (Subprocess aborted)
+		product_small_33           #  144 (Subprocess aborted)
+
+		eigensolver_selfadjoint_13 #  452 (Subprocess aborted)
+
+		cholmod_support_21         #  726 (Subprocess aborted)
+		cholmod_support_22         #  727 (Subprocess aborted)
+
+		NonLinearOptimization      #  930 (Subprocess aborted)
+		openglsupport              #  990 (Failed)
+		levenberg_marquardt        # 1020 (Subprocess aborted)
+	)
+
+	if use cuda ; then
+		cuda_add_sandbox -w
+
+		CMAKE_SKIP_TESTS+=(
+			cxx11_tensor_cast_float16_gpu
+			cxx11_tensor_gpu_5
+		)
+	fi
+
+	if use lapack ; then
+		CMAKE_SKIP_TESTS+=(
+			"^LAPACK-.*$"
+		)
+	fi
+
+	local myctestargs=(
+		-j1 # otherwise breaks due to cmake reruns
+	)
+
+	cmake_src_test
+}
diff --git a/dev-cpp/eigen/eigen-3.4.9999.ebuild b/dev-cpp/eigen/eigen-3.4.9999.ebuild
new file mode 100644
index 000000000000..d58e3b110010
--- /dev/null
+++ b/dev-cpp/eigen/eigen-3.4.9999.ebuild
@@ -0,0 +1,409 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+FORTRAN_NEEDED="test"
+inherit cmake cuda fortran-2 llvm toolchain-funcs
+
+DESCRIPTION="C++ template library for linear algebra"
+HOMEPAGE="https://eigen.tuxfamily.org/index.php?title=Main_Page"
+
+if [[ ${PV} = *9999* ]] ; then
+	inherit git-r3
+	EGIT_REPO_URI="https://gitlab.com/lib${PN}/${PN}.git"
+	if [[ ${PV} = 3.4.9999* ]] ; then
+		EGIT_COMMIT="3.4"
+	fi
+else
+	SRC_URI="
+		https://gitlab.com/lib${PN}/${PN}/-/archive/${PV}/${P}.tar.bz2
+		test? ( lapack? ( https://downloads.tuxfamily.org/${PN}/lapack_addons_3.4.1.tgz -> ${PN}-lapack_addons-3.4.1.tgz ) )
+	"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~x64-macos"
+fi
+
+LICENSE="MPL-2.0"
+SLOT="3"
+
+# The following lines are shamelessly stolen from ffmpeg-9999.ebuild with modifications
+ARM_CPU_FEATURES=(
+	neon:NEON
+)
+PPC_CPU_FEATURES=(
+	altivec:ALTIVEC
+	vsx:VSX
+)
+X86_CPU_FEATURES=(
+	avx:AVX
+	avx2:AVX2
+	avx512f:AVX512
+	avx512dq:AVX512DQ
+	f16c:FP16C
+	fma3:FMA
+	popcnt:POPCNT
+	sse:SSE
+	sse2:SSE2
+	sse3:SSE3
+	ssse3:SSSE3
+	sse4_1:SSE4_1
+	sse4_2:SSE4_2
+)
+# MIPS_CPU_FEATURES=(
+# 	msa:MSA
+# )
+# S390_CPU_FEATURES=(
+# 	z13:Z13
+# 	z14:Z14
+# )
+
+CPU_FEATURES_MAP=(
+	${ARM_CPU_FEATURES[@]/#/cpu_flags_arm_}
+	${PPC_CPU_FEATURES[@]/#/cpu_flags_ppc_}
+	${X86_CPU_FEATURES[@]/#/cpu_flags_x86_}
+	# ${MIPS_CPU_FEATURES[@]/#/cpu_flags_mips_}
+	# ${S390_CPU_FEATURES[@]/#/cpu_flags_s390_}
+)
+
+IUSE_TEST_BACKENDS=(
+	"adolc"
+	"boost"
+	"cholmod"
+	"fftw"
+	"klu"
+	"opengl"
+	"openmp"
+	"pastix"
+	"sparsehash"
+	"spqr"
+	"superlu"
+	"umfpack"
+)
+
+IUSE="benchmark ${CPU_FEATURES_MAP[*]%:*} clang cuda hip debug doc lapack test ${IUSE_TEST_BACKENDS[*]}" #zvector
+
+# Tests failing again because of compiler issues
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	doc? (
+		app-doc/doxygen[dot]
+		dev-texlive/texlive-bibtexextra
+		dev-texlive/texlive-fontsextra
+		dev-texlive/texlive-fontutils
+		dev-texlive/texlive-latex
+		dev-texlive/texlive-latexextra
+	)
+	test? ( virtual/pkgconfig )
+"
+
+# METIS
+# MPREAL
+# dev-libs/mpfr:0
+# dev-libs/gmp:0
+
+TEST_BACKENDS="
+		boost? ( dev-libs/boost )
+		adolc? ( sci-libs/adolc[sparse] )
+		cholmod? ( sci-libs/cholmod:= )
+		fftw? ( sci-libs/fftw )
+		spqr? ( sci-libs/spqr )
+		klu? ( sci-libs/klu )
+		opengl? (
+			media-libs/freeglut
+			media-libs/glew
+			media-libs/libglvnd
+		)
+		pastix? ( sci-libs/pastix[-mpi] )
+		sparsehash? (
+			amd64? ( dev-cpp/sparsehash )
+			arm64? ( dev-cpp/sparsehash )
+			ppc64? ( dev-cpp/sparsehash )
+			x86?   ( dev-cpp/sparsehash )
+		)
+		superlu? ( sci-libs/superlu )
+		umfpack? ( sci-libs/umfpack )
+"
+DEPEND="
+	test? (
+		cuda? (
+			!clang? (
+				dev-util/nvidia-cuda-toolkit
+			)
+			clang? (
+				sys-devel/clang[llvm_targets_NVPTX]
+				openmp? ( sys-libs/libomp[llvm_targets_NVPTX,offload] )
+			)
+		)
+		hip? ( dev-util/hip )
+		lapack? ( virtual/lapacke )
+		${TEST_BACKENDS}
+	)
+"
+
+REQUIRED_USE="
+	|| ( ${IUSE_TEST_BACKENDS[*]} )
+"
+
+PATCHES=(
+	"${FILESDIR}/${PN}-3.3.9-max-macro.patch"
+	"${FILESDIR}/${PN}-3.4.0-doc-nocompress.patch" # bug 830064
+	"${FILESDIR}/${PN}-3.4.0-buildstring.patch"
+	"${FILESDIR}/${PN}-3.4.0-noansi.patch"
+	"${FILESDIR}/${PN}-3.4.0-cxxstandard.patch"
+)
+
+# TODO should be in cuda.eclass
+cuda_set_CUDAHOSTCXX() {
+	local compiler
+	tc-is-gcc && compiler="gcc"
+	tc-is-clang && compiler="clang"
+	[[ -z "$compiler" ]] && die "no compiler specified"
+
+	local package="sys-devel/${compiler}"
+	local version="${package}"
+	local CUDAHOSTCXX_test
+	while
+		CUDAHOSTCXX="${CUDAHOSTCXX_test}"
+		version=$(best_version "${version}")
+		if [[ -z "${version}" ]]; then
+			if [[ -z "${CUDAHOSTCXX}" ]]; then
+				die "could not find supported version of ${package}"
+			fi
+			break
+		fi
+		CUDAHOSTCXX_test="$(
+			dirname "$(
+				realpath "$(
+					which "${compiler}-$(echo "${version}" | grep -oP "(?<=${package}-)[0-9]*")"
+				)"
+			)"
+		)"
+		version="<${version}"
+	do ! echo "int main(){}" | nvcc "-ccbin ${CUDAHOSTCXX_test}" - -x cu &>/dev/null; done
+
+	export CUDAHOSTCXX
+}
+
+src_unpack() {
+	if [[ ${PV} = *9999* ]] ; then
+		git-r3_src_unpack
+	else
+		unpack "${P}.tar.bz2"
+
+		if use test && use lapack; then
+			cd "${S}/lapack" || die
+			unpack "${PN}-lapack_addons-3.4.1.tgz"
+		fi
+	fi
+}
+
+src_prepare() {
+	cmake_src_prepare
+
+	cmake_comment_add_subdirectory demos
+
+	if ! use test; then
+		sed -e "/add_subdirectory(test/s/^/#DONOTCOMPILE /g" \
+			-e "/add_subdirectory(blas/s/^/#DONOTCOMPILE /g" \
+			-e "/add_subdirectory(lapack/s/^/#DONOTCOMPILE /g" \
+			-i CMakeLists.txt || die
+	fi
+
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DEIGEN_BUILD_BTL="$(usex benchmark)"
+	)
+	if use test; then
+		mycmakeargs+=(
+			# the OpenGL testsuite is extremely brittle, bug #712808
+			-DOpenGL_GL_PREFERENCE="GLVND"
+			-DEIGEN_TEST_OPENGL="$(usex opengl)" # Enable OpenGL support in unit tests
+			-DEIGEN_TEST_OPENMP="$(usex openmp)" # Enable/Disable OpenMP in tests/examples
+
+			# needs Qt4
+			-DEIGEN_TEST_NOQT=yes # Disable Qt support in unit tests
+
+			-DCMAKE_DISABLE_FIND_PACKAGE_MPREAL=ON
+
+			-DEIGEN_TEST_CXX11=yes
+
+			# -DEIGEN_TEST_CUSTOM_CXX_FLAGS= # Additional compiler flags when compiling unit tests.
+			# -DEIGEN_TEST_CUSTOM_LINKER_FLAGS= # Additional linker flags when linking unit tests.
+			# -DEIGEN_TEST_BUILD_FLAGS= # Options passed to the build command of unit tests
+
+			# -DEIGEN_BUILD_BTL=yes # Build benchmark suite
+
+			# -DEIGEN_INTERNAL_DOCUMENTATION=no # Build internal documentation
+			# -DEIGEN_BUILD_DOC=yes # Enable creation of Eigen documentation
+			# -DEIGEN_BUILD_PKGCONFIG=yes # Build pkg-config .pc file for Eigen
+			# -DEIGEN_DOC_USE_MATHJAX=yes # Use MathJax for rendering math in HTML docs
+
+			-DEIGEN_TEST_BUILD_DOCUMENTATION="$(usex doc)" # Test building the doxygen documentation
+
+			# -DEIGEN_COVERAGE_TESTING=no # Enable/disable gcov
+			# -DEIGEN_CTEST_ERROR_EXCEPTION= # Regular expression for build error messages to be filtered out
+			# -DEIGEN_DEBUG_ASSERTS=no # Enable advanced debugging of assertions
+			# -DEIGEN_NO_ASSERTION_CHECKING=no # Disable checking of assertions using exceptions
+			# -DEIGEN_TEST_NO_EXCEPTIONS=no # Disables C++ exceptions
+			# -DEIGEN_TEST_NO_EXPLICIT_ALIGNMENT=no # Disable explicit alignment (hence vectorization) in tests/examples
+			# -DEIGEN_TEST_NO_EXPLICIT_VECTORIZATION=no # Disable explicit vectorization in tests/examples
+
+			# -DEIGEN_DASHBOARD_BUILD_TARGET=buildtests # Target to be built in dashboard mode, default is buildtests
+
+			# -DEIGEN_DEFAULT_TO_ROW_MAJOR=no # Use row-major as default matrix storage order
+
+			# -DEIGEN_TEST_MATRIX_DIR=yes # Enable testing of realword sparse matrices contained in the specified path
+			# -DEIGEN_TEST_MAX_SIZE=320 # Maximal matrix/vector size, default is 320
+			# -DEIGEN_SPLIT_LARGE_TESTS=no # Split large tests into smaller executables
+		)
+
+		use !adolc      && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_Adolc="TRUE" )
+		use !boost      && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_Boost="TRUE" )
+		use !cholmod    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_CHOLMOD="TRUE" )
+		use !fftw       && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_FFTW="TRUE" )
+		use !sparsehash && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_GoogleHash="TRUE" )
+		use !klu        && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_KLU="TRUE" )
+		use !opengl     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_OpenGL="TRUE" )
+		use !openmp     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_OpenMP="TRUE" )
+		use !pastix     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_PASTIX="TRUE" )
+		use !spqr       && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_SPQR="TRUE" )
+		use !superlu    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_SuperLU="TRUE" )
+		use !umfpack    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_UMFPACK="TRUE" )
+
+		if use lapack; then
+			mycmakeargs+=(
+				-DEIGEN_ENABLE_LAPACK_TESTS=yes
+				-DEIGEN_TEST_EXTERNAL_BLAS=yes # Use external BLAS library for testsuite
+				-DCMAKE_DISABLE_FIND_PACKAGE_SuperLU=ON
+			)
+		fi
+
+		if use arm; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_NEON="$(usex cpu_flags_arm_neon)"
+			)
+		fi
+
+		if use arm64; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_NEON64="$(usex cpu_flags_arm_neon)"
+			)
+		fi
+
+		if use ppc || use ppc64; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_ALTIVEC="$(usex cpu_flags_ppc_altivec)"
+				-DEIGEN_TEST_VSX="$(usex cpu_flags_ppc_vsx)"
+			)
+		fi
+
+		if use amd64 || use x86; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_32BIT=no # Force generating 32bit code.
+				# -DEIGEN_TEST_X87=no # Force using X87 instructions. Implies no vectorization.
+				-DEIGEN_TEST_SSE2="$(usex cpu_flags_x86_sse2)"
+				-DEIGEN_TEST_SSE3="$(usex cpu_flags_x86_sse3)"
+				-DEIGEN_TEST_SSSE3="$(usex cpu_flags_x86_ssse3)"
+				-DEIGEN_TEST_FMA="$(usex cpu_flags_x86_fma3)"
+				-DEIGEN_TEST_SSE4_1="$(usex cpu_flags_x86_sse4_1)"
+				-DEIGEN_TEST_SSE4_2="$(usex cpu_flags_x86_sse4_2)"
+				-DEIGEN_TEST_AVX="$(usex cpu_flags_x86_avx)"
+				-DEIGEN_TEST_F16C="$(usex cpu_flags_x86_f16c)"
+				-DEIGEN_TEST_AVX2="$(usex cpu_flags_x86_avx2)"
+				-DEIGEN_TEST_AVX512="$(usex cpu_flags_x86_avx512f)"
+				-DEIGEN_TEST_AVX512DQ="$(usex cpu_flags_x86_avx512dq)"
+			)
+		fi
+
+		if use mips; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_MSA=no # Enable/Disable MSA in tests/examples
+			)
+		fi
+
+		if use s390; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_Z13=no # Enable/Disable S390X(zEC13) ZVECTOR in tests/examples
+				# -DEIGEN_TEST_Z14=no # Enable/Disable S390X(zEC14) ZVECTOR in tests/examples
+			)
+		fi
+
+		mycmakeargs+=(
+			-DEIGEN_TEST_CUDA="$(usex cuda)" # Enable CUDA support in unit tests
+			-DEIGEN_TEST_CUDA_CLANG="$(usex cuda "$(usex clang)")" # Use clang instead of nvcc to compile the CUDA tests
+
+			-DEIGEN_TEST_HIP="$(usex hip)" # Add HIP support.
+
+			# -DEIGEN_TEST_SYCL=no # Add Sycl support.
+			# -DEIGEN_SYCL_TRISYCL=no # Use the triSYCL Sycl implementation (ComputeCPP by default).
+		)
+
+		if use cuda; then
+			cuda_add_sandbox -w
+			export CUDAFLAGS="${NVCCFLAGS}"
+			if use clang; then
+				local llvm_prefix
+				llvm_prefix="$(get_llvm_prefix -b)"
+				export CC="${llvm_prefix}/bin/clang"
+				export CXX="${llvm_prefix}/bin/clang++"
+			else
+				cuda_set_CUDAHOSTCXX
+				mycmakeargs+=(
+					-DCUDA_HOST_COMPILER="${CUDAHOSTCXX}"
+				)
+			fi
+			if [[ "${CUDA_VERBOSE}" == true ]]; then
+				mycmakeargs+=(
+					-DCUDA_VERBOSE_BUILD=yes
+				)
+				NVCCFLAGS+=" -v"
+			fi
+
+			[[ -z "${CUDAARCHS}" ]] && einfo "trying to determine host CUDAARCHS"
+			: "${CUDAARCHS:=$(__nvcc_device_query)}"
+			export CUDAARCHS
+
+			mycmakeargs+=(
+				-DEIGEN_CUDA_COMPUTE_ARCH="${CUDAARCHS}"
+			)
+		fi
+	fi
+
+	cmake_src_configure
+}
+
+src_compile() {
+	local targets=()
+	if use doc; then
+		targets+=( doc )
+		HTML_DOCS=( "${BUILD_DIR}"/doc/html/. )
+	fi
+	if use test; then
+		targets+=( buildtests )
+		if ! use lapack; then
+			targets+=( blas )
+		fi
+		# tests generate random data, which
+		# obviously fails for some seeds
+		export EIGEN_SEED=712808
+	fi
+
+	if use doc || use test; then
+		cmake_src_compile "${targets[@]}"
+	fi
+}
+
+src_test() {
+	if use cuda ; then
+		cuda_add_sandbox -w
+	fi
+
+	local myctestargs=(
+		-j1 # otherwise breaks due to cmake reruns
+	)
+
+	cmake_src_test
+}
diff --git a/dev-cpp/eigen/eigen-9999.ebuild b/dev-cpp/eigen/eigen-9999.ebuild
new file mode 100644
index 000000000000..c622dd3a94bf
--- /dev/null
+++ b/dev-cpp/eigen/eigen-9999.ebuild
@@ -0,0 +1,405 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+FORTRAN_NEEDED="test"
+inherit cmake cuda fortran-2 llvm toolchain-funcs
+
+DESCRIPTION="C++ template library for linear algebra"
+HOMEPAGE="https://eigen.tuxfamily.org/index.php?title=Main_Page"
+
+if [[ ${PV} = *9999* ]] ; then
+	inherit git-r3
+	EGIT_REPO_URI="https://gitlab.com/lib${PN}/${PN}.git"
+	if [[ ${PV} = 3.4.9999* ]] ; then
+		EGIT_COMMIT="3.4"
+	fi
+else
+	SRC_URI="
+		https://gitlab.com/lib${PN}/${PN}/-/archive/${PV}/${P}.tar.bz2
+		test? ( lapack? ( https://downloads.tuxfamily.org/${PN}/lapack_addons_3.4.1.tgz -> ${PN}-lapack_addons-3.4.1.tgz ) )
+	"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~x64-macos"
+fi
+
+LICENSE="MPL-2.0"
+SLOT="3"
+
+# The following lines are shamelessly stolen from ffmpeg-9999.ebuild with modifications
+ARM_CPU_FEATURES=(
+	neon:NEON
+)
+PPC_CPU_FEATURES=(
+	altivec:ALTIVEC
+	vsx:VSX
+)
+X86_CPU_FEATURES=(
+	avx:AVX
+	avx2:AVX2
+	avx512f:AVX512
+	avx512dq:AVX512DQ
+	f16c:FP16C
+	fma3:FMA
+	popcnt:POPCNT
+	sse:SSE
+	sse2:SSE2
+	sse3:SSE3
+	ssse3:SSSE3
+	sse4_1:SSE4_1
+	sse4_2:SSE4_2
+)
+# MIPS_CPU_FEATURES=(
+# 	msa:MSA
+# )
+# S390_CPU_FEATURES=(
+# 	z13:Z13
+# 	z14:Z14
+# )
+
+CPU_FEATURES_MAP=(
+	${ARM_CPU_FEATURES[@]/#/cpu_flags_arm_}
+	${PPC_CPU_FEATURES[@]/#/cpu_flags_ppc_}
+	${X86_CPU_FEATURES[@]/#/cpu_flags_x86_}
+	# ${MIPS_CPU_FEATURES[@]/#/cpu_flags_mips_}
+	# ${S390_CPU_FEATURES[@]/#/cpu_flags_s390_}
+)
+
+IUSE_TEST_BACKENDS=(
+	"adolc"
+	"boost"
+	"cholmod"
+	"fftw"
+	"klu"
+	"opengl"
+	"openmp"
+	"pastix"
+	"sparsehash"
+	"spqr"
+	"superlu"
+	"umfpack"
+)
+
+IUSE="benchmark ${CPU_FEATURES_MAP[*]%:*} clang cuda hip debug doc lapack test ${IUSE_TEST_BACKENDS[*]}" #zvector
+
+# Tests failing again because of compiler issues
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	doc? (
+		app-doc/doxygen[dot]
+		dev-texlive/texlive-bibtexextra
+		dev-texlive/texlive-fontsextra
+		dev-texlive/texlive-fontutils
+		dev-texlive/texlive-latex
+		dev-texlive/texlive-latexextra
+	)
+	test? ( virtual/pkgconfig )
+"
+
+# METIS
+# MPREAL
+# dev-libs/mpfr:0
+# dev-libs/gmp:0
+
+TEST_BACKENDS="
+		boost? ( dev-libs/boost )
+		adolc? ( sci-libs/adolc[sparse] )
+		cholmod? ( sci-libs/cholmod:= )
+		fftw? ( sci-libs/fftw )
+		spqr? ( sci-libs/spqr )
+		klu? ( sci-libs/klu )
+		opengl? (
+			media-libs/freeglut
+			media-libs/glew
+			media-libs/libglvnd
+		)
+		pastix? ( sci-libs/pastix[-mpi] )
+		sparsehash? (
+			amd64? ( dev-cpp/sparsehash )
+			arm64? ( dev-cpp/sparsehash )
+			ppc64? ( dev-cpp/sparsehash )
+			x86?   ( dev-cpp/sparsehash )
+		)
+		superlu? ( sci-libs/superlu )
+		umfpack? ( sci-libs/umfpack )
+"
+DEPEND="
+	test? (
+		cuda? (
+			!clang? (
+				dev-util/nvidia-cuda-toolkit
+			)
+			clang? (
+				sys-devel/clang[llvm_targets_NVPTX]
+				openmp? ( sys-libs/libomp[llvm_targets_NVPTX,offload] )
+			)
+		)
+		hip? ( dev-util/hip )
+		lapack? ( virtual/lapacke )
+		${TEST_BACKENDS}
+	)
+"
+
+REQUIRED_USE="
+	|| ( ${IUSE_TEST_BACKENDS[*]} )
+"
+
+PATCHES=(
+	"${FILESDIR}/${PN}-3.4.0-doc-nocompress.patch" # bug 830064
+	"${FILESDIR}/${PN}-3.4.0-buildstring.patch"
+	"${FILESDIR}/${PN}-9999-please_protect_your_min_with_parentheses.patch"
+)
+
+# TODO should be in cuda.eclass
+cuda_set_CUDAHOSTCXX() {
+	local compiler
+	tc-is-gcc && compiler="gcc"
+	tc-is-clang && compiler="clang"
+	[[ -z "$compiler" ]] && die "no compiler specified"
+
+	local package="sys-devel/${compiler}"
+	local version="${package}"
+	local CUDAHOSTCXX_test
+	while
+		CUDAHOSTCXX="${CUDAHOSTCXX_test}"
+		version=$(best_version "${version}")
+		if [[ -z "${version}" ]]; then
+			if [[ -z "${CUDAHOSTCXX}" ]]; then
+				die "could not find supported version of ${package}"
+			fi
+			break
+		fi
+		CUDAHOSTCXX_test="$(
+			dirname "$(
+				realpath "$(
+					which "${compiler}-$(echo "${version}" | grep -oP "(?<=${package}-)[0-9]*")"
+				)"
+			)"
+		)"
+		version="<${version}"
+	do ! echo "int main(){}" | nvcc "-ccbin ${CUDAHOSTCXX_test}" - -x cu &>/dev/null; done
+
+	export CUDAHOSTCXX
+}
+
+src_unpack() {
+	if [[ ${PV} = *9999* ]] ; then
+		git-r3_src_unpack
+	else
+		unpack "${P}.tar.bz2"
+
+		if use test && use lapack; then
+			cd "${S}/lapack" || die
+			unpack "${PN}-lapack_addons-3.4.1.tgz"
+		fi
+	fi
+}
+
+src_prepare() {
+	cmake_src_prepare
+
+	cmake_comment_add_subdirectory demos
+
+	if ! use test; then
+		sed -e "/add_subdirectory(test/s/^/#DONOTCOMPILE /g" \
+			-e "/add_subdirectory(blas/s/^/#DONOTCOMPILE /g" \
+			-e "/add_subdirectory(lapack/s/^/#DONOTCOMPILE /g" \
+			-i CMakeLists.txt || die
+	fi
+
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DEIGEN_BUILD_BTL="$(usex benchmark)"
+	)
+	if use test; then
+		mycmakeargs+=(
+			# the OpenGL testsuite is extremely brittle, bug #712808
+			-DOpenGL_GL_PREFERENCE="GLVND"
+			-DEIGEN_TEST_OPENGL="$(usex opengl)" # Enable OpenGL support in unit tests
+			-DEIGEN_TEST_OPENMP="$(usex openmp)" # Enable/Disable OpenMP in tests/examples
+
+			# needs Qt4
+			-DEIGEN_TEST_NOQT=yes # Disable Qt support in unit tests
+
+			-DCMAKE_DISABLE_FIND_PACKAGE_MPREAL=ON
+
+			# -DEIGEN_TEST_CUSTOM_CXX_FLAGS= # Additional compiler flags when compiling unit tests.
+			# -DEIGEN_TEST_CUSTOM_LINKER_FLAGS= # Additional linker flags when linking unit tests.
+			# -DEIGEN_TEST_BUILD_FLAGS= # Options passed to the build command of unit tests
+
+			# -DEIGEN_BUILD_BTL=yes # Build benchmark suite
+
+			# -DEIGEN_INTERNAL_DOCUMENTATION=no # Build internal documentation
+			# -DEIGEN_BUILD_DOC=yes # Enable creation of Eigen documentation
+			# -DEIGEN_BUILD_PKGCONFIG=yes # Build pkg-config .pc file for Eigen
+			# -DEIGEN_DOC_USE_MATHJAX=yes # Use MathJax for rendering math in HTML docs
+
+			-DEIGEN_TEST_BUILD_DOCUMENTATION="$(usex doc)" # Test building the doxygen documentation
+
+			# -DEIGEN_COVERAGE_TESTING=no # Enable/disable gcov
+			# -DEIGEN_CTEST_ERROR_EXCEPTION= # Regular expression for build error messages to be filtered out
+			# -DEIGEN_DEBUG_ASSERTS=no # Enable advanced debugging of assertions
+			# -DEIGEN_NO_ASSERTION_CHECKING=no # Disable checking of assertions using exceptions
+			# -DEIGEN_TEST_NO_EXCEPTIONS=no # Disables C++ exceptions
+			# -DEIGEN_TEST_NO_EXPLICIT_ALIGNMENT=no # Disable explicit alignment (hence vectorization) in tests/examples
+			# -DEIGEN_TEST_NO_EXPLICIT_VECTORIZATION=no # Disable explicit vectorization in tests/examples
+
+			# -DEIGEN_DASHBOARD_BUILD_TARGET=buildtests # Target to be built in dashboard mode, default is buildtests
+
+			# -DEIGEN_DEFAULT_TO_ROW_MAJOR=no # Use row-major as default matrix storage order
+
+			# -DEIGEN_TEST_MATRIX_DIR=yes # Enable testing of realword sparse matrices contained in the specified path
+			# -DEIGEN_TEST_MAX_SIZE=320 # Maximal matrix/vector size, default is 320
+			# -DEIGEN_SPLIT_LARGE_TESTS=no # Split large tests into smaller executables
+		)
+
+		use !adolc      && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_Adolc="TRUE" )
+		use !boost      && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_Boost="TRUE" )
+		use !cholmod    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_CHOLMOD="TRUE" )
+		use !fftw       && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_FFTW="TRUE" )
+		use !sparsehash && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_GoogleHash="TRUE" )
+		use !klu        && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_KLU="TRUE" )
+		use !opengl     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_OpenGL="TRUE" )
+		use !openmp     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_OpenMP="TRUE" )
+		use !pastix     && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_PASTIX="TRUE" )
+		use !spqr       && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_SPQR="TRUE" )
+		use !superlu    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_SuperLU="TRUE" )
+		use !umfpack    && mycmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_UMFPACK="TRUE" )
+
+		if use lapack; then
+			mycmakeargs+=(
+				-DEIGEN_ENABLE_LAPACK_TESTS=yes
+				-DEIGEN_TEST_EXTERNAL_BLAS=yes # Use external BLAS library for testsuite
+				-DCMAKE_DISABLE_FIND_PACKAGE_SuperLU=ON
+			)
+		fi
+
+		if use arm; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_NEON="$(usex cpu_flags_arm_neon)"
+			)
+		fi
+
+		if use arm64; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_NEON64="$(usex cpu_flags_arm_neon)"
+			)
+		fi
+
+		if use ppc || use ppc64; then
+			mycmakeargs+=(
+				-DEIGEN_TEST_ALTIVEC="$(usex cpu_flags_ppc_altivec)"
+				-DEIGEN_TEST_VSX="$(usex cpu_flags_ppc_vsx)"
+			)
+		fi
+
+		if use amd64 || use x86; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_32BIT=no # Force generating 32bit code.
+				# -DEIGEN_TEST_X87=no # Force using X87 instructions. Implies no vectorization.
+				-DEIGEN_TEST_SSE2="$(usex cpu_flags_x86_sse2)"
+				-DEIGEN_TEST_SSE3="$(usex cpu_flags_x86_sse3)"
+				-DEIGEN_TEST_SSSE3="$(usex cpu_flags_x86_ssse3)"
+				-DEIGEN_TEST_FMA="$(usex cpu_flags_x86_fma3)"
+				-DEIGEN_TEST_SSE4_1="$(usex cpu_flags_x86_sse4_1)"
+				-DEIGEN_TEST_SSE4_2="$(usex cpu_flags_x86_sse4_2)"
+				-DEIGEN_TEST_AVX="$(usex cpu_flags_x86_avx)"
+				-DEIGEN_TEST_F16C="$(usex cpu_flags_x86_f16c)"
+				-DEIGEN_TEST_AVX2="$(usex cpu_flags_x86_avx2)"
+				-DEIGEN_TEST_AVX512="$(usex cpu_flags_x86_avx512f)"
+				-DEIGEN_TEST_AVX512DQ="$(usex cpu_flags_x86_avx512dq)"
+			)
+		fi
+
+		if use mips; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_MSA=no # Enable/Disable MSA in tests/examples
+			)
+		fi
+
+		if use s390; then
+			mycmakeargs+=(
+				# -DEIGEN_TEST_Z13=no # Enable/Disable S390X(zEC13) ZVECTOR in tests/examples
+				# -DEIGEN_TEST_Z14=no # Enable/Disable S390X(zEC14) ZVECTOR in tests/examples
+			)
+		fi
+
+		mycmakeargs+=(
+			-DEIGEN_TEST_CUDA="$(usex cuda)" # Enable CUDA support in unit tests
+			-DEIGEN_TEST_CUDA_CLANG="$(usex cuda "$(usex clang)")" # Use clang instead of nvcc to compile the CUDA tests
+
+			-DEIGEN_TEST_HIP="$(usex hip)" # Add HIP support.
+
+			# -DEIGEN_TEST_SYCL=no # Add Sycl support.
+			# -DEIGEN_SYCL_TRISYCL=no # Use the triSYCL Sycl implementation (ComputeCPP by default).
+		)
+
+		if use cuda; then
+			cuda_add_sandbox -w
+			export CUDAFLAGS="${NVCCFLAGS}"
+			if use clang; then
+				local llvm_prefix
+				llvm_prefix="$(get_llvm_prefix -b)"
+				export CC="${llvm_prefix}/bin/clang"
+				export CXX="${llvm_prefix}/bin/clang++"
+			else
+				cuda_set_CUDAHOSTCXX
+				mycmakeargs+=(
+					-DCUDA_HOST_COMPILER="${CUDAHOSTCXX}"
+				)
+			fi
+			if [[ "${CUDA_VERBOSE}" == true ]]; then
+				mycmakeargs+=(
+					-DCUDA_VERBOSE_BUILD=yes
+				)
+				NVCCFLAGS+=" -v"
+			fi
+
+			[[ -z "${CUDAARCHS}" ]] && einfo "trying to determine host CUDAARCHS"
+			: "${CUDAARCHS:=$(__nvcc_device_query)}"
+			export CUDAARCHS
+
+			mycmakeargs+=(
+				-DEIGEN_CUDA_COMPUTE_ARCH="${CUDAARCHS}"
+			)
+		fi
+	fi
+
+	cmake_src_configure
+}
+
+src_compile() {
+	local targets=()
+	if use doc; then
+		targets+=( doc )
+		HTML_DOCS=( "${BUILD_DIR}"/doc/html/. )
+	fi
+	if use test; then
+		targets+=( buildtests )
+		# if ! use lapack; then
+		# 	targets+=( blas )
+		# fi
+		# tests generate random data, which
+		# obviously fails for some seeds
+		export EIGEN_SEED=712808
+	fi
+
+	if use doc || use test; then
+		cmake_src_compile "${targets[@]}"
+	fi
+}
+
+src_test() {
+	if use cuda ; then
+		cuda_add_sandbox -w
+	fi
+
+	local myctestargs=(
+		-j1 # otherwise breaks due to cmake reruns
+	)
+
+	cmake_src_test
+}
diff --git a/dev-cpp/eigen/files/eigen-3.4.0-buildstring.patch b/dev-cpp/eigen/files/eigen-3.4.0-buildstring.patch
new file mode 100644
index 000000000000..cb3671dc0100
--- /dev/null
+++ b/dev-cpp/eigen/files/eigen-3.4.0-buildstring.patch
@@ -0,0 +1,27 @@
+--- a/cmake/EigenTesting.cmake
++++ b/cmake/EigenTesting.cmake
+@@ -559,14 +559,22 @@ macro(ei_get_cxxflags VAR)
+     set(${VAR} VSX)
+   elseif(EIGEN_TEST_ALTIVEC)
+     set(${VAR} ALVEC)
+-  elseif(EIGEN_TEST_FMA)
+-    set(${VAR} FMA)
++  elseif(EIGEN_TEST_AVX512DQ)
++    set(${VAR} AVX512DQ)
++  elseif(EIGEN_TEST_AVX512)
++    set(${VAR} AVX512)
++  elseif(EIGEN_TEST_AVX2)
++    set(${VAR} AVX2)
++  elseif(EIGEN_TEST_F16C)
++    set(${VAR} F16C)
+   elseif(EIGEN_TEST_AVX)
+     set(${VAR} AVX)
+   elseif(EIGEN_TEST_SSE4_2)
+     set(${VAR} SSE42)
+   elseif(EIGEN_TEST_SSE4_1)
+     set(${VAR} SSE41)
++  elseif(EIGEN_TEST_FMA)
++    set(${VAR} FMA)
+   elseif(EIGEN_TEST_SSSE3)
+     set(${VAR} SSSE3)
+   elseif(EIGEN_TEST_SSE3)
diff --git a/dev-cpp/eigen/files/eigen-3.4.0-cxxstandard.patch b/dev-cpp/eigen/files/eigen-3.4.0-cxxstandard.patch
new file mode 100644
index 000000000000..826aa78d05aa
--- /dev/null
+++ b/dev-cpp/eigen/files/eigen-3.4.0-cxxstandard.patch
@@ -0,0 +1,108 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -74,19 +74,9 @@ macro(ei_add_cxx_compiler_flag FLAG)
+   endif()
+ endmacro()
+ 
+-check_cxx_compiler_flag("-std=c++11" EIGEN_COMPILER_SUPPORT_CPP11)
+-
+-if(EIGEN_TEST_CXX11)
+-  set(CMAKE_CXX_STANDARD 11)
+-  set(CMAKE_CXX_EXTENSIONS OFF)
+-  if(EIGEN_COMPILER_SUPPORT_CPP11)
+-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+-  endif()
+-else()
+-  #set(CMAKE_CXX_STANDARD 03)
+-  #set(CMAKE_CXX_EXTENSIONS OFF)
+-  ei_add_cxx_compiler_flag("-std=c++03")
+-endif()
++set(CMAKE_CXX_STANDARD 14)
++set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
++set(CMAKE_CXX_EXTENSIONS OFF)
+ 
+ # Determine if we should build shared libraries on this platform.
+ get_cmake_property(EIGEN_BUILD_SHARED_LIBS TARGET_SUPPORTS_SHARED_LIBS)
+@@ -157,7 +157,6 @@ if(NOT MSVC)
+   ei_add_cxx_compiler_flag("-Wshorten-64-to-32")
+   ei_add_cxx_compiler_flag("-Wlogical-op")
+   ei_add_cxx_compiler_flag("-Wenum-conversion")
+-  ei_add_cxx_compiler_flag("-Wc++11-extensions")
+   ei_add_cxx_compiler_flag("-Wdouble-promotion")
+ #  ei_add_cxx_compiler_flag("-Wconversion")
+
+--- a/Eigen/src/Core/util/Macros.h
++++ b/Eigen/src/Core/util/Macros.h
+@@ -37,7 +37,7 @@
+ // Expected values are 03, 11, 14, 17, etc.
+ // By default, let's use an arbitrarily large C++ version.
+ #ifndef EIGEN_MAX_CPP_VER
+-#define EIGEN_MAX_CPP_VER 99
++#define EIGEN_MAX_CPP_VER 14
+ #endif
+ 
+ /** Allows to disable some optimizations which might affect the accuracy of the result.
+--- a/doc/examples/CMakeLists.txt
++++ b/doc/examples/CMakeLists.txt
+@@ -14,7 +14,3 @@ foreach(example_src ${examples_SRCS})
+   )
+   add_dependencies(all_examples ${example})
+ endforeach()
+-
+-if(EIGEN_COMPILER_SUPPORT_CPP11)
+-ei_add_target_property(nullary_indexing COMPILE_FLAGS "-std=c++11")
+-endif()
+\ No newline at end of file
+diff --git a/doc/snippets/CMakeLists.txt b/doc/snippets/CMakeLists.txt
+index 65f195a..4cb18c8 100644
+--- a/doc/snippets/CMakeLists.txt
++++ b/doc/snippets/CMakeLists.txt
+@@ -15,9 +15,6 @@ foreach(snippet_src ${snippets_SRCS})
+     if(EIGEN_STANDARD_LIBRARIES_TO_LINK_TO)
+       target_link_libraries(${compile_snippet_target} ${EIGEN_STANDARD_LIBRARIES_TO_LINK_TO})
+     endif()
+-    if(${snippet_src} MATCHES "cxx11")
+-      set_target_properties(${compile_snippet_target} PROPERTIES COMPILE_FLAGS "-std=c++11")
+-    endif()
+     if(${snippet_src} MATCHES "deprecated")
+       set_target_properties(${compile_snippet_target} PROPERTIES COMPILE_FLAGS "-DEIGEN_NO_DEPRECATED_WARNING")
+     endif()
+--- a/test/CMakeLists.txt
++++ b/test/CMakeLists.txt
+@@ -399,7 +399,6 @@ if(CUDA_FOUND)
+     set(CUDA_NVCC_FLAGS "-ccbin ${CMAKE_C_COMPILER}" CACHE STRING "nvcc flags" FORCE)
+   endif()
+   if(EIGEN_TEST_CUDA_CLANG)
+-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+     string(APPEND CMAKE_CXX_FLAGS " --cuda-path=${CUDA_TOOLKIT_ROOT_DIR}")
+     foreach(GPU IN LISTS EIGEN_CUDA_COMPUTE_ARCH)
+       string(APPEND CMAKE_CXX_FLAGS " --cuda-gpu-arch=sm_${GPU}")
+--- a/unsupported/test/CMakeLists.txt
++++ b/unsupported/test/CMakeLists.txt
+@@ -59,7 +59,7 @@ find_package(MPREAL)
+ if(MPREAL_FOUND AND EIGEN_COMPILER_SUPPORT_CPP11)
+   ei_add_property(EIGEN_TESTED_BACKENDS "MPFR C++, ")
+   include_directories(${MPREAL_INCLUDES})
+-  ei_add_test(mpreal_support "-std=c++11" "${MPREAL_LIBRARIES}" )
++  ei_add_test(mpreal_support "-std=c++14" "${MPREAL_LIBRARIES}" )
+ else()
+   ei_add_property(EIGEN_MISSING_BACKENDS "MPFR C++, ")
+ endif()
+@@ -308,7 +308,6 @@ if(CUDA_FOUND AND EIGEN_TEST_CUDA)
+     set(CUDA_NVCC_FLAGS "-ccbin ${CMAKE_C_COMPILER}" CACHE STRING "nvcc flags" FORCE)
+   endif()
+   if(EIGEN_TEST_CUDA_CLANG)
+-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+     string(APPEND CMAKE_CXX_FLAGS " --cuda-path=${CUDA_TOOLKIT_ROOT_DIR}")
+     foreach(ARCH IN LISTS EIGEN_CUDA_COMPUTE_ARCH)
+         string(APPEND CMAKE_CXX_FLAGS " --cuda-gpu-arch=sm_${ARCH}")
+--- a/doc/special_examples/CMakeLists.txt
++++ b/doc/special_examples/CMakeLists.txt
+@@ -23,7 +23,6 @@ if(EIGEN_COMPILER_SUPPORT_CPP11)
+   add_executable(random_cpp11 random_cpp11.cpp)
+   target_link_libraries(random_cpp11 ${EIGEN_STANDARD_LIBRARIES_TO_LINK_TO})
+   add_dependencies(all_examples random_cpp11)
+-  ei_add_target_property(random_cpp11 COMPILE_FLAGS "-std=c++11")
+
+   add_custom_command(
+     TARGET random_cpp11
diff --git a/dev-cpp/eigen/files/eigen-3.4.0-noansi.patch b/dev-cpp/eigen/files/eigen-3.4.0-noansi.patch
new file mode 100644
index 000000000000..c0ce44445c1d
--- /dev/null
+++ b/dev-cpp/eigen/files/eigen-3.4.0-noansi.patch
@@ -0,0 +1,18 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -184,6 +184,7 @@ if(NOT MSVC)
+   ei_add_cxx_compiler_flag("-wd2304")                   # disable ICC's "warning #2304: non-explicit constructor with single argument may cause implicit type conversion" produced by -Wnon-virtual-dtor
+ 
+ 
++  if(NOT EIGEN_TEST_CXX11)
+   # The -ansi flag must be added last, otherwise it is also used as a linker flag by check_cxx_compiler_flag making it fails
+   # Moreover we should not set both -strict-ansi and -ansi
+   check_cxx_compiler_flag("-strict-ansi" COMPILER_SUPPORT_STRICTANSI)
+@@ -194,6 +195,7 @@ if(NOT MSVC)
+   else()
+     ei_add_cxx_compiler_flag("-ansi")
+   endif()
++  endif()
+ 
+   if(ANDROID_NDK)
+     ei_add_cxx_compiler_flag("-pie")
diff --git a/dev-cpp/eigen/files/eigen-9999-please_protect_your_min_with_parentheses.patch b/dev-cpp/eigen/files/eigen-9999-please_protect_your_min_with_parentheses.patch
new file mode 100644
index 000000000000..0453fd33a8ae
--- /dev/null
+++ b/dev-cpp/eigen/files/eigen-9999-please_protect_your_min_with_parentheses.patch
@@ -0,0 +1,54 @@
+diff --git a/test/main.h b/test/main.h
+index 771725f06..df22e12f6 100644
+--- a/test/main.h
++++ b/test/main.h
+@@ -86,32 +86,6 @@
+ #define EIGEN_DEFAULT_DENSE_INDEX_TYPE int
+ #endif
+ 
+-// To test that all calls from Eigen code to std::min() and std::max() are
+-// protected by parenthesis against macro expansion, the min()/max() macros
+-// are defined here and any not-parenthesized min/max call will cause a
+-// compiler error.
+-#if !defined(__HIPCC__) && !defined(EIGEN_USE_SYCL) && !defined(EIGEN_POCKETFFT_DEFAULT)
+-//
+-// HIP header files include the following files
+-//  <thread>
+-//  <regex>
+-//  <unordered_map>
+-// which seem to contain not-parenthesized calls to "max"/"min", triggering the following check and causing the compile
+-// to fail
+-//
+-// Including those header files before the following macro definition for "min" / "max", only partially resolves the
+-// issue This is because other HIP header files also define "isnan" / "isinf" / "isfinite" functions, which are needed
+-// in other headers.
+-//
+-// So instead choosing to simply disable this check for HIP
+-//
+-#define min(A, B) please_protect_your_min_with_parentheses
+-#define max(A, B) please_protect_your_max_with_parentheses
+-#define isnan(X) please_protect_your_isnan_with_parentheses
+-#define isinf(X) please_protect_your_isinf_with_parentheses
+-#define isfinite(X) please_protect_your_isfinite_with_parentheses
+-#endif
+-
+ // test possible conflicts
+ struct real {};
+ struct imag {};
+diff --git a/test/main.h b/test/main.h
+index df22e12f6..5ca40424e 100644
+--- a/test/main.h
++++ b/test/main.h
+@@ -95,12 +95,6 @@ struct imag {};
+ #endif
+ #define M_PI please_use_EIGEN_PI_instead_of_M_PI
+ 
+-#define FORBIDDEN_IDENTIFIER \
+-  (this_identifier_is_forbidden_to_avoid_clashes) this_identifier_is_forbidden_to_avoid_clashes
+-// B0 is defined in POSIX header termios.h
+-#define B0 FORBIDDEN_IDENTIFIER
+-#define I FORBIDDEN_IDENTIFIER
+-
+ // _res is defined by resolv.h
+ #define _res FORBIDDEN_IDENTIFIER
+ 
diff --git a/dev-cpp/eigen/metadata.xml b/dev-cpp/eigen/metadata.xml
index 65119626c2f1..57571f41d055 100644
--- a/dev-cpp/eigen/metadata.xml
+++ b/dev-cpp/eigen/metadata.xml
@@ -16,6 +16,23 @@
 		OpenGL apps, spreadsheets and other office apps, etc. Eigen is dedicated to
 		providing optimal speed with GCC.
 	</longdescription>
+	<use>
+		<flag name="benchmark">Build benchmark suite</flag>
+		<flag name="clang">Use clang for cuda units compilation</flag>
+		<flag name="hip">Enable HIP GPU computing support</flag>
+		<flag name="adolc">Add test support for Adolc (<pkg>sci-libs/adolc</pkg>)</flag>
+		<flag name="boost">Add test support for Boost.Multiprecision (<pkg>dev-libs/boost</pkg>)</flag>
+		<flag name="cholmod">Add test support for CHOLMOD (<pkg>sci-libs/cholmod</pkg>)</flag>
+		<flag name="fftw">Add test support for fftw (<pkg>sci-libs/fftw</pkg>)</flag>
+		<flag name="klu">Add test support for KLU (<pkg>sci-libs/klu</pkg>)</flag>
+		<flag name="opengl">Add test support for OpenGL</flag>
+		<flag name="openmp">Add test support for the OpenMP (support parallel computing)</flag>
+		<flag name="pastix">Add test support for PaStiX (<pkg>sci-libs/pastix</pkg>)</flag>
+		<flag name="sparsehash">Add test support for GoogleHash (<pkg>dev-cpp/sparsehash</pkg>)</flag>
+		<flag name="spqr">Add test support for SPQR (<pkg>sci-libs/spqr</pkg>)</flag>
+		<flag name="superlu">Add test support for SuperLU (<pkg>sci-libs/superlu</pkg>)</flag>
+		<flag name="umfpack">Add test support for UMFPACK (<pkg>sci-libs/umfpack</pkg>)</flag>
+	</use>
 	<upstream>
 		<remote-id type="gitlab">libeigen/eigen</remote-id>
 	</upstream>