# Copyright 2019-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

LLVM_MAX_SLOT=15
inherit cmake llvm check-reqs

DESCRIPTION="A robust, optimal, and maintainable programming language"
HOMEPAGE="https://ziglang.org/"
if [[ ${PV} == 9999 ]]; then
	EGIT_REPO_URI="https://github.com/ziglang/zig.git"
	inherit git-r3
else
	SRC_URI="https://ziglang.org/download/${PV}/${P}.tar.xz"
	KEYWORDS="~amd64 ~arm ~arm64"
fi

LICENSE="MIT"
SLOT="0"

BUILD_DIR="${S}/build"

# Zig requires zstd and zlib compression support in LLVM, if using LLVM backend (non-LLVM backends don't require these).
# They are not required "on their own", so please don't add them here.
# You can check https://github.com/ziglang/zig-bootstrap in future, to see
# options that are passed to LLVM CMake building (excluding "static" ofc).
DEPEND="
	sys-devel/clang:${LLVM_MAX_SLOT}=
	sys-devel/lld:${LLVM_MAX_SLOT}=
	sys-devel/llvm:${LLVM_MAX_SLOT}=[zstd]
"

RDEPEND="
	${DEPEND}
	!dev-lang/zig-bin
"

# see https://github.com/ziglang/zig/issues/3382
QA_FLAGS_IGNORED="usr/bin/zig"

# see https://ziglang.org/download/0.10.0/release-notes.html#Self-Hosted-Compiler
# 0.10.0 release - 9.6 GiB, since we use compiler written in C++ for bootstrapping
# 0.11.0 release - ~2.8 GiB, since we will (at least according to roadmap) use self-hosted compiler
# (transpiled to C via C backend) for bootstrapping
CHECKREQS_MEMORY="10G"

llvm_check_deps() {
	has_version "sys-devel/clang:${LLVM_SLOT}"
}

pkg_setup() {
	llvm_pkg_setup
	check-reqs_pkg_setup
}

src_configure() {
	local mycmakeargs=(
		-DZIG_USE_CCACHE=OFF
		-DZIG_SHARED_LLVM=ON
		-DCMAKE_PREFIX_PATH=$(get_llvm_prefix ${LLVM_MAX_SLOT})
	)

	cmake_src_configure
}

src_test() {
	cd "${BUILD_DIR}" || die
	./zig2 build test -Dstatic-llvm=false -Denable-llvm=true -Dskip-non-native=true || die
}