app-admin/ananicy-cpp: Add support for Clang compilation and eBPF implementation

Signed-off-by: Alberto Gireud <agireud@protonmail.com>

app-admin/ananicy-cpp/ananicy-cpp-1.1.1-r3.ebuild

@@ -10,32 +10,65 @@ HOMEPAGE="https://gitlab.com/ananicy-cpp/ananicy-cpp"
 LICENSE="GPL-3"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE="systemd"
+IUSE="bpf clang systemd"
+REQUIRED_USE="
+	bpf? ( clang )
+"
 
 SRC_URI="https://gitlab.com/ananicy-cpp/ananicy-cpp/-/archive/v${PV}/${PN}-v${PV}.tar.bz2"
 S="${WORKDIR}/${PN}-v${PV}"
 
-DEPEND="
+RDEPEND="
 	!app-admin/ananicy
 	>=dev-cpp/nlohmann_json-3.9
 	>=dev-libs/libfmt-8
 	>=dev-libs/spdlog-1.9
+	bpf? (
+		 dev-libs/elfutils
+		 dev-libs/libbpf
+		 dev-util/bpftool
+	)
 	systemd? ( sys-apps/systemd )
 "
-RDEPEND="${DEPEND}"
+
+DEPEND="
+	>=dev-build/cmake-3.17
+	clang? ( >=sys-devel/clang-10 )
+	${RDEPEND}
+"
 
 PATCHES=(
 	"${FILESDIR}/${P}-remove-debug-flags.patch"
 )
 
+pkg_setup() {
+	if use bpf ; then
+		CONFIG_CHECK+="~BPF ~BPF_EVENTS ~BPF_SYSCALL ~HAVE_EBPF_JIT"
+	fi
+}
+
 src_configure() {
 	local mycmakeargs=(
 		-DENABLE_SYSTEMD=$(usex systemd)
+		-DUSE_BPF_PROC_IMPL=$(usex bpf)
 		-DUSE_EXTERNAL_FMTLIB=ON
 		-DUSE_EXTERNAL_JSON=ON
 		-DUSE_EXTERNAL_SPDLOG=ON
 		-DVERSION=${PV}
 	)
+
+	if use clang; then
+		local version_clang=$(clang --version 2>/dev/null | grep -F -- 'clang version' | awk '{ print $3 }')
+		[[ -n ${version_clang} ]] && version_clang=$(ver_cut 1 "${version_clang}")
+		[[ -z ${version_clang} ]] && die "Failed to read clang version!"
+		CC=${CHOST}-clang-${version_clang}
+		CXX=${CHOST}-clang++-${version_clang}
+
+		if use bpf ; then
+			mycmakeargs+=( -DBPF_BUILD_LIBBPF=OFF )
+		fi
+	fi
+
 	cmake_src_configure
 }
 

app-admin/ananicy-cpp/metadata.xml

@@ -10,4 +10,8 @@
     <remote-id type="gitlab">ananicy-cpp/ananicy-cpp</remote-id>
     <remote-id type="github">kuche1/minq-ananicy</remote-id>
   </upstream>
+  <use>
+    <flag name="bpf">Use eBPF for processing</flag>
+    <flag name="clang">Use Clang compiler instead of GCC</flag>
+  </use>
 </pkgmetadata>