dev-cpp/vexcl: improvements

someone practical with docs eclass should review
Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

dev-cpp/vexcl/metadata.xml

@@ -14,4 +14,13 @@
 		</maintainer>
 		<remote-id type="github">ddemidov/vexcl</remote-id>
 	</upstream>
+	<use>
+		<flag name="amdsi">Implement workaround for AMD SI GPUs</flag>
+		<flag name="clhpp">Install the OpenCL C++ header provided by VexCL</flag>
+		<!--<flag name="clogs">Use clogs algorithms</flag>-->
+		<flag name="compute">Use Boost.Compute algorithms</flag>
+		<!--<flag name="cuda">Use CUDA as backend</flag>-->
+		<flag name="jit">Use the JIT backend</flag>
+		<flag name="opencl">Use OpenCL as backend</flag>
+	</use>
 </pkgmetadata>

dev-cpp/vexcl/vexcl-1.4.2-r1.ebuild

@@ -0,0 +1,74 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+#DOCS_AUTODOC=0
+DOCS_BUILDER="sphinx"
+DOCS_DEPEND="dev-python/sphinx-bootstrap-theme"
+DOCS_DIR="docs"
+PYTHON_COMPAT=( python3_{7..9} )
+
+inherit cmake python-any-r1 docs
+
+DESCRIPTION="VexCL - Vector expression template library for OpenCL"
+HOMEPAGE="https://github.com/ddemidov/vexcl"
+SRC_URI="https://github.com/ddemidov/vexcl/archive/refs/tags/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="amdsi clhpp compute examples jit +opencl test" #cuda clogs
+REQUIRED_USE="^^ ( compute jit opencl )" #cuda
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	compute? ( dev-libs/boost:= )
+	jit? ( virtual/opencl )
+	opencl? ( virtual/opencl )
+"
+DEPEND="${RDEPEND}"
+
+src_prepare() {
+	default
+	sed -e "s|git_version()|${PV}|g" -i docs/conf.py || die
+	cmake_src_prepare
+}
+
+src_configure() {
+	local backend
+#	use  && backend="All"
+	use compute && backend="Compute"
+#	use cuda && backend="CUDA"
+	use jit && backend="JIT"
+	use opencl && backend="OpenCL"
+
+	local mycmakeargs=(
+		-DVEXCL_BUILD_EXAMPLES=OFF
+
+		-DVEXCL_AMD_SI_WORKAROUND=$(usex amdsi)
+		-DVEXCL_BACKEND="${backend}"
+		-DVEXCL_BUILD_TESTS=$(usex test)
+		-DVEXCL_INSTALL_CL_HPP=$(usex clhpp)
+	)
+#		-DVEXCL_CLOGS=$(usex clogs)
+
+	cmake_src_configure
+}
+
+src_compile() {
+	cmake_src_compile
+        docs_compile
+}
+
+src_install() {
+	cmake_src_install
+	if use doc; then
+		dodoc -r docs/html
+		docompress -x "/usr/share/doc/${P}/html"
+	fi
+	if use examples; then
+		dodoc -r examples
+		docompress -x "/usr/share/doc/${P}/examples"
+	fi
+}

dev-cpp/vexcl/vexcl-1.4.2.ebuild

@@ -1,30 +0,0 @@
-# Copyright 1999-2021 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=7
-
-inherit cmake
-
-DESCRIPTION="VexCL - Vector expression template library for OpenCL"
-HOMEPAGE="https://github.com/ddemidov/vexcl"
-SRC_URI="https://github.com/ddemidov/vexcl/archive/refs/tags/${PV}.tar.gz -> ${P}.tar.gz"
-
-LICENSE="MIT"
-SLOT="0"
-KEYWORDS="~amd64"
-#TODO: cuda doc test
-IUSE="examples"
-
-RDEPEND="
-	dev-libs/boost:=
-	virtual/opencl
-"
-DEPEND="${RDEPEND}"
-
-src_install() {
-	cmake_src_install
-	if use examples; then
-		dodoc -r examples
-		docompress -x "/usr/share/doc/${P}/examples"
-	fi
-}