net-im/conduit: use llvm-r2 eclass

Signed-off-by: Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in>

net-im/conduit/conduit-0.9.0-r1.ebuild

@@ -1,8 +1,6 @@
-# Copyright 2023-2024 Gentoo Authors
+# Copyright 2023-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-# Auto-Generated by cargo-ebuild 0.5.4
-
 EAPI=8
 
 CRATES="
@@ -373,6 +371,8 @@ CRATES="
 	zune-core@0.4.12
 	zune-jpeg@0.4.11
 "
+LLVM_COMPAT=( {15..19} )
+RUST_MIN_VER="1.79.0"
 
 declare -A GIT_CRATES=(
 	[ruma-appservice-api]='https://github.com/ruma/ruma;c06af4385e0e30c48a8e9ca3d488da32102d0db9;ruma-%commit%/crates/ruma-appservice-api'
@@ -390,9 +390,7 @@ declare -A GIT_CRATES=(
 	[ruma]='https://github.com/ruma/ruma;c06af4385e0e30c48a8e9ca3d488da32102d0db9;ruma-%commit%/crates/ruma'
 )
 
-RUST_MIN_VER="1.75.0"
-
-inherit cargo systemd toolchain-funcs
+inherit cargo llvm-r2 systemd toolchain-funcs
 
 MY_P="${PN}-v${PV}"
 DESCRIPTION="Matrix homeserver written in Rust"
@@ -430,7 +428,7 @@ IUSE="jemalloc rocksdb system-rocksdb"
 #	- app-arch/lz4 ("lz4-sys" crate doesn't look for system library... ironic)
 #	- dev-db/sqlite:3 ("conduit" pulls "rusqlite[bundled]" explicitly)
 #	- sys-libs/zlib ("rust-librocksdb-sys" pulls "libz-sys[static]" by default)
-DEPEND="
+COMMON_DEPEND="
 	jemalloc? ( dev-libs/jemalloc:= )
 	rocksdb? (
 		app-arch/snappy:=
@@ -438,13 +436,21 @@ DEPEND="
 		system-rocksdb? ( dev-libs/rocksdb )
 	)
 "
-RDEPEND="${DEPEND}
+RDEPEND="${COMMON_DEPEND}
 	acct-user/conduit
 	app-misc/ca-certificates
 "
+# clang needed for bindgen
+DEPEND="${COMMON_DEPEND}
+	rocksdb? (
+		$(llvm_gen_dep '
+			llvm-core/clang:${LLVM_SLOT}
+			llvm-core/llvm:${LLVM_SLOT}
+		')
+	)
+"
 BDEPEND="
 	rocksdb? (
-		llvm-core/clang
 		virtual/pkgconfig
 	)
 "
@@ -453,9 +459,12 @@ DOCS=( {APPSERVICES,CODE_OF_CONDUCT,DEPLOY,README,TURN}.md )
 
 QA_FLAGS_IGNORED="usr/bin/${PN}"
 
-src_configure() {
-	tc-export AR CC
+pkg_setup() {
+	use rocksdb && llvm-r2_pkg_setup
+	rust_pkg_setup
+}
 
+src_configure() {
 	# Tracker bug for that Cargo nonsense:
 	# https://bugs.gentoo.org/709568
 	export PKG_CONFIG_ALLOW_CROSS=1
@@ -466,6 +475,14 @@ src_configure() {
 	if use system-rocksdb; then
 		export ROCKSDB_INCLUDE_DIR="${ESYSROOT}/usr/include"
 		export ROCKSDB_LIB_DIR="${ESYSROOT}/usr/$(get_libdir)"
+	elif use rocksdb; then
+		# Rust uses 'gcc' or 'clang' (not 'g++' or 'clang++'), so C++ standard
+		# library needs to be linked explicitly.
+		if [[ $(tc-get-cxx-stdlib) == "libstdc++" ]]; then
+			append-ldflags -lstdc++
+		elif [[ $(tc-get-cxx-stdlib) == "libc++" ]]; then
+			append-ldflags -lc++
+		fi
 	fi
 
 	local myfeatures=(