add dev-lang/zig ❤

dev-lang/zig/zig-9999-r1.ebuild

@@ -0,0 +1,51 @@
+# Copyright 2019-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake llvm
+
+DESCRIPTION="A robust, optimal, and maintainable programming language"
+HOMEPAGE="https://ziglang.org/"
+LICENSE="MIT"
+SLOT="0"
+IUSE="+experimental"
+
+if [[ ${PV} == 9999 ]]; then
+	EGIT_REPO_URI="https://github.com/ziglang/zig.git"
+	inherit git-r3
+else
+	SRC_URI="https://github.com/ziglang/zig/archive/${PV}.tar.gz -> ${P}.tar.gz"
+	KEYWORDS="~amd64"
+fi
+
+# According to zig's author, zig builds that do not support all targets are not
+# supported by the upstream project.
+ALL_LLVM_TARGETS=(
+	AArch64 AMDGPU ARM AVR BPF Hexagon Lanai Mips MSP430 NVPTX
+	PowerPC RISCV Sparc SystemZ WebAssembly X86 XCore
+)
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS="${ALL_LLVM_TARGETS[@]}"
+
+LLVM_MAX_SLOT=12
+
+RDEPEND="
+	sys-devel/clang:${LLVM_MAX_SLOT}
+	>=sys-devel/lld-12.0.0
+	sys-devel/llvm:${LLVM_MAX_SLOT}
+	!experimental? ( sys-devel/llvm:${LLVM_MAX_SLOT}[${LLVM_TARGET_USEDEPS// /,}] )
+"
+DEPEND="${RDEPEND}"
+
+llvm_check_deps() {
+	has_version "sys-devel/clang:${LLVM_SLOT}"
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DZIG_USE_CCACHE=OFF
+		-DZIG_PREFER_CLANG_CPP_DYLIB=ON
+	)
+	cmake_src_configure
+}