dev-lang/zig: new package

Zig is an open-source programming language designed for robustness,
optimality, and maintainability.

Feature Highlights
- Manual memory management. Memory allocation failure is handled correctly.
  Edge cases matter!
- Zig competes with C instead of depending on it. The Zig Standard Library
  does not depend on libc.
- Small, simple language. Focus on debugging your application rather than
  debugging your knowledge of your programming language.
- A fresh take on error handling that resembles what well-written C error
  handling looks like, minus the boilerplate and verbosity.
- Debug mode optimizes for fast compilation time and crashing with a stack
  trace when undefined behavior would happen.
- ReleaseFast mode produces heavily optimized code. What other projects call
  "Link Time Optimization" Zig does automatically.
- ReleaseSafe mode produces optimized code but keeps safety checks enabled.
  Disable safety checks in the bottlenecks of your code.
- Generic data structures and functions.
- Compile-time reflection and compile-time code execution. No preprocessor.
- Concurrency via coroutines. Async/await is thread-safe, non-blocking, and
  makes no syscalls, and therefore available in freestanding mode. You can
  multiplex coroutines onto a thread pool in userland for M:N concurrency.
- Import .h files and directly use C types, variables, and functions.
- Export functions, variables, and types for C code to depend on.
  Automatically generate .h files.
- Optional type instead of null pointers.
- Order independent top level declarations.
- Friendly toward package maintainers. Reproducible build, 3-step
  bootstrapping process.
- Cross-compiling is a first-class use case.

Package-Manager: portage-2.3.66
Closes: https://bugs.gentoo.org/683386
Signed-off-by: Nick Erdmann <n@nirf.de>
Closes: https://github.com/gentoo/gentoo/pull/12110
Signed-off-by: Joonas Niilola <juippis@gentoo.org>

3 files changed, 75 insertions, 0 deletions

diff --git a/dev-lang/zig/Manifest b/dev-lang/zig/Manifest
new file mode 100644
index 000000000000..d5a4c7c3d611
--- /dev/null
+++ b/dev-lang/zig/Manifest
@@ -0,0 +1 @@
+DIST zig-0.4.0.tar.gz 8924757 BLAKE2B 5ca3377f205694ff02360900b49eee7347cdf1cdaef90f1be071eff2610425ed453dfb35928fbe65b25f151b7153ab838c887d362ed3cd746f07833ae42510fd SHA512 423915730bc4ae9a67db3731a96471467826d16e59b87b3541f3e8ed2436f941939f22ccbebdb9a958a195b05360eb65f5be1658b32a01cc8db55c6e581eb039
diff --git a/dev-lang/zig/metadata.xml b/dev-lang/zig/metadata.xml
new file mode 100644
index 000000000000..514f150afb0e
--- /dev/null
+++ b/dev-lang/zig/metadata.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>n@nirf.de</email>
+		<name>Nick Erdmann</name>
+	</maintainer>
+	<maintainer type="project">
+		<email>proxy-maint@gentoo.org</email>
+		<name>Proxy Maintainers</name>
+	</maintainer>
+	<use>
+		<flag name="experimental">Enable builds that do not support all of LLVM's target architectures</flag>
+	</use>
+	<upstream>
+		<remote-id type="github">ziglang/zig</remote-id>
+	</upstream>
+</pkgmetadata>
diff --git a/dev-lang/zig/zig-0.4.0.ebuild b/dev-lang/zig/zig-0.4.0.ebuild
new file mode 100644
index 000000000000..5edf8df88870
--- /dev/null
+++ b/dev-lang/zig/zig-0.4.0.ebuild
@@ -0,0 +1,56 @@
+# Copyright 2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake-utils
+
+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 -> ${P}.tar.gz"
+	KEYWORDS="~amd64"
+fi
+
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM BPF Hexagon Lanai Mips MSP430 NVPTX
+	PowerPC Sparc SystemZ WebAssembly X86 XCore )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+# According to zig's author, zig builds that do not support all targets are not
+# supported by the upstream project.
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]}
+
+RDEPEND="
+	=sys-devel/llvm-8*
+	!experimental? ( =sys-devel/llvm-8*[${LLVM_TARGET_USEDEPS// /,}] )
+"
+
+DEPEND="${RDEPEND}"
+
+src_prepare() {
+	if use experimental; then
+		sed -i '/^NEED_TARGET(/d' cmake/Findllvm.cmake || die "unable to modify cmake/Findllvm.cmake"
+	fi
+
+	sed -i '/^install(TARGETS zig_cpp/d' CMakeLists.txt || die "unable to modify CMakeLists.txt"
+	sed -i '/install(TARGETS embedded/d' CMakeLists.txt || die "unable to modify CMakeLists.txt"
+
+	# Suppress error messages
+	sed -i '/if(NOT(CMAKE_BUILD_TYPE/,/endif()/d' cmake/Findllvm.cmake || die "unable to modify cmake/Findllvm.cmake"
+
+	cmake-utils_src_prepare
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DBUILD_SHARED_LIBS=OFF
+	)
+
+	cmake-utils_src_configure
+}