dev-lang/zig: add 0.10.0

Drop "threads" USE flag, since this is default and well-tested
configuration by upstream.
Drop "test" USE flag, since it doesn't require special dependencies (or preparations)
necessary to run tests.

Bug: https://bugs.gentoo.org/876181
Signed-off-by: Eric Joldasov <bratishkaerik@getgoogleoff.me>
Signed-off-by: Sam James <sam@gentoo.org>

3 files changed, 86 insertions, 5 deletions

diff --git a/dev-lang/zig/Manifest b/dev-lang/zig/Manifest
index f18eeb3ba012..fd2ecb470579 100644
--- a/dev-lang/zig/Manifest
+++ b/dev-lang/zig/Manifest
@@ -1,2 +1,3 @@
+DIST zig-0.10.0.tar.xz 14530912 BLAKE2B 5949a44ee039b7d5a163344a0fc26af8dd9cf311ed25c7092a665bb59ec7dec8dc3cd39918d81ef02c707aa8989b038fb21dfba3927fd31153a1404739b4ea3c SHA512 9d83ce51cc0ce404c06da820179c1cc47aa50e573fb1c831a96baa12c6b5226abe85b384110f2ffc4cbdc5f24eaba1f14a4e3249ffeaa248c0d73ba29859e682
 DIST zig-0.9.1-fix-detecting-abi.patch 22233 BLAKE2B fa523c4c4c23a74c0b4f85c6d2d91ef98b31d25694bb9dbc7988b82db972a16ab273aa9f1883cfa8ca79ef7fc56fca67d0a8656ba248b6db47bc902b7ac64a93 SHA512 259967f88f54c20f556bd9d67189ce3a2cfeb0250f0cee4dffb29020d976d61265a5dd9ae9cfcadfb7b1e152b47ee17f4184eafac2b80495f4ee8f98733cd692
 DIST zig-0.9.1.tar.xz 13940828 BLAKE2B 996b0e945f61b01dddbb7c8674a9e2d2d01b93eb48fdfd2c986496330990ffa64cba15f8bd8518b90ef6f514759ba6cc3fd31d6044c5b11b92bf92e3f7f15303 SHA512 0b8a5f9b7e34e4252536f59bc91429f1e76b2bf8e01f024095919f6ecf34db56b5c86c554fbb94bdcb5255394c87f2c87519c8f34c631f53816927ec0882ae2d
diff --git a/dev-lang/zig/zig-0.10.0.ebuild b/dev-lang/zig/zig-0.10.0.ebuild
new file mode 100644
index 000000000000..451df4ef6f6d
--- /dev/null
+++ b/dev-lang/zig/zig-0.10.0.ebuild
@@ -0,0 +1,81 @@
+# 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="
+	${DEPEND}
+	!dev-lang/zig-bin
+"
+
+llvm_check_deps() {
+	has_version "sys-devel/clang:${LLVM_SLOT}"
+}
+
+# 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"
+
+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
+}
+
+# see https://github.com/ziglang/zig/issues/3382
+# For now, Zig doesn't support CFLAGS/LDFLAGS/etc.
+QA_FLAGS_IGNORED="usr/bin/zig"
+
+pkg_postinst() {
+	elog "0.10.0 release introduces self-hosted compiler for general use by default"
+	elog "It means that your code can be un-compilable since this compiler has some new or removed features and new or fixed bugs"
+	elog "Upstream recommends using stage1 if experiencing such breakage,"
+	elog "until bugfix release 0.10.1 or release 0.11.0 where old compiler will be fully replaced"
+	elog "You can use old compiler by using '-fstage1' flag"
+	elog "Also see: https://ziglang.org/download/0.10.0/release-notes.html#Self-Hosted-Compiler"
+	elog "and https://ziglang.org/download/0.10.0/release-notes.html#How-to-Upgrade"
+}
diff --git a/dev-lang/zig/zig-9999.ebuild b/dev-lang/zig/zig-9999.ebuild
index f4f7a100d588..b5b25d1f884f 100644
--- a/dev-lang/zig/zig-9999.ebuild
+++ b/dev-lang/zig/zig-9999.ebuild
@@ -42,7 +42,10 @@ llvm_check_deps() {
 	has_version "sys-devel/clang:${LLVM_SLOT}"
 }
 
-# see https://github.com/ziglang/zig/wiki/Troubleshooting-Build-Issues#high-memory-requirements
+# 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"
 
 pkg_setup() {
@@ -68,7 +71,3 @@ src_test() {
 
 # see https://github.com/ziglang/zig/issues/3382
 QA_FLAGS_IGNORED="usr/bin/zig"
-
-pkg_postinst() {
-	elog "If you want to use stage1 backend, use -fstage1 flag"
-}