dev-lang/zig: slotting, initial support for setting ZIG_{MCPU,TARGET}

  * Install Zig to "/usr/$(get_libdir)/zig/${PV}", handle
    /usr/bin/zig via eselect-zig
  * Add functions for getting ZIG_TARGET and ZIG_MCPU (user-provided or
    defaults) and use them for building/testing
  * Add "doc" USE flag for installing language reference and stdlib
    documentation

Closes: https://bugs.gentoo.org/885861
Bug: https://bugs.gentoo.org/890234
Signed-off-by: Eric Joldasov <bratishkaerik@getgoogleoff.me>
Signed-off-by: Florian Schmaus <flow@gentoo.org>

1 files changed, 76 insertions, 6 deletions

diff --git a/dev-lang/zig/zig-9999.ebuild b/dev-lang/zig/zig-9999.ebuild
index 04794281b8d8..17f5c3e65408 100644
--- a/dev-lang/zig/zig-9999.ebuild
+++ b/dev-lang/zig/zig-9999.ebuild
@@ -1,10 +1,10 @@
-# Copyright 2019-2022 Gentoo Authors
+# Copyright 2019-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
 
 LLVM_MAX_SLOT=15
-inherit cmake llvm check-reqs
+inherit edo cmake llvm check-reqs toolchain-funcs
 
 DESCRIPTION="A robust, optimal, and maintainable programming language"
 HOMEPAGE="https://ziglang.org/"
@@ -17,7 +17,8 @@ else
 fi
 
 LICENSE="MIT"
-SLOT="0"
+SLOT="$(ver_cut 1-2)"
+IUSE="doc"
 
 BUILD_DIR="${S}/build"
 
@@ -34,10 +35,11 @@ DEPEND="
 
 RDEPEND="
 	${DEPEND}
-	!dev-lang/zig-bin
+	app-eselect/eselect-zig
 "
 
 # see https://github.com/ziglang/zig/issues/3382
+# For now, Zig Build System doesn't support enviromental CFLAGS/LDFLAGS/etc.
 QA_FLAGS_IGNORED="usr/bin/zig"
 
 # Since commit https://github.com/ziglang/zig/commit/e7d28344fa3ee81d6ad7ca5ce1f83d50d8502118
@@ -48,6 +50,46 @@ llvm_check_deps() {
 	has_version "sys-devel/clang:${LLVM_SLOT}"
 }
 
+ctarget_to_zigtarget() {
+	# Zig's Target Format: arch-os-abi
+	local CTARGET="${CTARGET:-${CHOST}}"
+
+	local ZIG_ARCH
+	case "${CTARGET%%-*}" in
+		i?86)		ZIG_ARCH=x86;;
+		sparcv9)	ZIG_ARCH=sparc64;;
+		*)		ZIG_ARCH="${CTARGET%%-*}";; # Same as in CHOST
+	esac
+
+	local ZIG_OS
+	case "${CTARGET}" in
+		*linux*)	ZIG_OS=linux;;
+		*apple*)	ZIG_OS=macos;;
+	esac
+
+	local ZIG_ABI
+	case "${CTARGET##*-}" in
+		gnu)		ZIG_ABI=gnu;;
+		solaris*)	ZIG_OS=solaris ZIG_ABI=none;;
+		darwin*)	ZIG_ABI=none;;
+		*)		ZIG_ABI="${CTARGET##*-}";; # Same as in CHOST
+	esac
+
+	echo "${ZIG_ARCH}-${ZIG_OS}-${ZIG_ABI}"
+}
+
+get_zig_mcpu() {
+	local ZIG_DEFAULT_MCPU=native
+	tc-is-cross-compiler && ZIG_DEFAULT_MCPU=baseline
+	echo "${ZIG_MCPU:-${ZIG_DEFAULT_MCPU}}"
+}
+
+get_zig_target() {
+	local ZIG_DEFAULT_TARGET=native
+	tc-is-cross-compiler && ZIG_DEFAULT_TARGET="$(ctarget_to_zigtarget)"
+	echo "${ZIG_TARGET:-${ZIG_DEFAULT_TARGET}}"
+}
+
 pkg_setup() {
 	llvm_pkg_setup
 	check-reqs_pkg_setup
@@ -57,13 +99,41 @@ src_configure() {
 	local mycmakeargs=(
 		-DZIG_USE_CCACHE=OFF
 		-DZIG_SHARED_LLVM=ON
-		-DCMAKE_PREFIX_PATH=$(get_llvm_prefix ${LLVM_MAX_SLOT})
+		-DZIG_TARGET_TRIPLE="$(get_zig_target)"
+		-DZIG_TARGET_MCPU="$(get_zig_mcpu)"
+		-DZIG_USE_LLVM_CONFIG=ON
+		-DCMAKE_PREFIX_PATH="$(get_llvm_prefix ${LLVM_MAX_SLOT})"
+		-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr/$(get_libdir)/zig/${PV}"
 	)
 
 	cmake_src_configure
 }
 
+src_compile() {
+	cmake_src_compile
+
+	if use doc; then
+		cd "${BUILD_DIR}" || die
+		edo ./zig2 run ../doc/docgen.zig -- --zig ./zig2 ../doc/langref.html.in "${S}/langref.html"
+		edo ./zig2 test ../lib/std/std.zig --zig-lib-dir ../lib -fno-emit-bin -femit-docs="${S}/std"
+	fi
+}
+
 src_test() {
 	cd "${BUILD_DIR}" || die
-	./zig2 build test -Dstatic-llvm=false -Denable-llvm=true -Dskip-non-native=true || die
+	local ZIG_TEST_ARGS="-Dstatic-llvm=false -Denable-llvm -Dskip-non-native \
+		-Drelease -Dtarget=$(get_zig_target) -Dcpu=$(get_zig_mcpu)"
+	# TBF zig2 -> stage3/bin/zig when (if) https://github.com/ziglang/zig/pull/14255 will be merged
+	edo ./zig2 build test ${ZIG_TEST_ARGS}
+}
+
+src_install() {
+	use doc && local HTML_DOCS=( "langref.html" "std" )
+	cmake_src_install
+
+	cd "${ED}/usr/$(get_libdir)/zig/${PV}/" || die
+	mv lib/zig/ lib2/ || die
+	rm -rf lib/ || die
+	mv lib2/ lib/ || die
+	dosym -r "/usr/$(get_libdir)/zig/${PV}/bin/zig" "/usr/bin/zig-${PV}"
 }