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javy-8.1.0-r1bennypowers

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# Copyright 2025 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

CRATES="
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"


RUST_MIN_VER="1.85.0"
RUST_REQ_USE="rust_sysroots_wasm"

inherit cargo

DESCRIPTION="JavaScript to WebAssembly toolchain"
HOMEPAGE="https://github.com/bytecodealliance/javy"
SRC_URI="
	https://github.com/bytecodealliance/javy/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz
	${CARGO_CRATE_URIS}
"

LICENSE="Apache-2.0-with-LLVM-exceptions"
# Dependent crate licenses
LICENSE+="
	Apache-2.0 BSD ISC MIT MPL-2.0 Unicode-3.0 ZLIB
	|| ( Apache-2.0 MIT )
"
SLOT="0"
KEYWORDS="~amd64"

# clang is needed for cross-compiling C code to wasm32-wasip1 (QuickJS in
# rquickjs-sys) and for building binaryen C++ via wasm-opt-sys/cxx.
# rust-bin is needed because Gentoo's dev-lang/rust patches the compiler
# identity (adding "(gentoo)"), making prebuilt wasm32-wasip1 stdlib
# ABI-incompatible. rust-bin uses upstream rustc which is compatible.
BDEPEND="
	llvm-core/clang
	dev-lang/rust-bin
"

QA_FLAGS_IGNORED="usr/bin/javy"

# Download wasm32-wasip1 stdlib at build time since the URL depends on
# the installed rust-bin version.
RESTRICT="network-sandbox"

src_unpack() {
	cargo_src_unpack

	# Find rust-bin installation and download matching wasm32-wasip1 stdlib.
	# Gentoo's dev-lang/rust cannot use prebuilt wasm targets due to ABI
	# mismatch (the "(gentoo)" compiler identity). rust-bin is upstream
	# rustc and IS compatible with the prebuilt stdlib.
	local rustbin_dir
	rustbin_dir=$(find /opt -maxdepth 1 -name "rust-bin-*" -type d | sort -V | tail -1) \
		|| die "Could not find rust-bin installation"
	[[ -n "${rustbin_dir}" ]] || die "dev-lang/rust-bin not found in /opt"

	local rustbin_ver="${rustbin_dir##*rust-bin-}"
	local rustbin_sysroot="${rustbin_dir}"

	if [[ ! -d "${rustbin_sysroot}/lib/rustlib/wasm32-wasip1" ]]; then
		einfo "Downloading wasm32-wasip1 stdlib for rust-bin ${rustbin_ver}..."
		wget -q "https://static.rust-lang.org/dist/rust-std-${rustbin_ver}-wasm32-wasip1.tar.xz" \
			-O "${T}/rust-std-wasm32-wasip1.tar.xz" \
			|| die "Failed to download wasm32-wasip1 stdlib"
		tar -xf "${T}/rust-std-wasm32-wasip1.tar.xz" -C "${T}" || die
		cp -a "${T}/rust-std-${rustbin_ver}-wasm32-wasip1/rust-std-wasm32-wasip1/lib/rustlib/wasm32-wasip1" \
			"${WORKDIR}/wasm32-wasip1-libs" || die
	else
		cp -a "${rustbin_sysroot}/lib/rustlib/wasm32-wasip1" \
			"${WORKDIR}/wasm32-wasip1-libs" || die
	fi

	# Build a local sysroot overlay using rust-bin as the base, with the
	# downloaded wasm32-wasip1 target added.
	local wasi_sysroot="${WORKDIR}/wasi-sysroot"
	mkdir -p "${wasi_sysroot}/lib/rustlib" || die
	# Symlink everything from rust-bin's sysroot
	local f
	for f in "${rustbin_sysroot}/lib/rustlib"/*; do
		ln -snf "${f}" "${wasi_sysroot}/lib/rustlib/${f##*/}" || die
	done
	for f in "${rustbin_sysroot}/lib/"*.so; do
		[[ -e "${f}" ]] || continue
		ln -snf "${f}" "${wasi_sysroot}/lib/" || die
	done
	# Add wasm32-wasip1 target (real copy, overriding any symlink)
	rm -f "${wasi_sysroot}/lib/rustlib/wasm32-wasip1"
	cp -a "${WORKDIR}/wasm32-wasip1-libs" \
		"${wasi_sysroot}/lib/rustlib/wasm32-wasip1" || die
}

src_compile() {
	local wasi_sysroot="${WORKDIR}/wasi-sysroot"

	# Build the default plugin for wasm32-wasip1.
	# Uses rust-bin's rustc (via --sysroot) because Gentoo's patched rustc
	# is ABI-incompatible with the prebuilt wasm32-wasip1 stdlib.
	(
		unset CARGO_BUILD_RUSTFLAGS CARGO_ENCODED_RUSTFLAGS RUSTFLAGS
		unset CARGO_BUILD_TARGET
		export CARGO_PROFILE_RELEASE_LTO=false
		export CARGO_PROFILE_RELEASE_STRIP=none
		export CC_wasm32_wasip1=clang
		local rustbin_dir
		rustbin_dir=$(find /opt -maxdepth 1 -name "rust-bin-*" -type d | sort -V | tail -1)
		export RUSTC="${rustbin_dir}/bin/rustc"
		export CARGO="${rustbin_dir}/bin/cargo"
		export CARGO_TARGET_WASM32_WASIP1_RUSTFLAGS="--sysroot ${wasi_sysroot} -C target-feature=+simd128"
		"${CARGO}" build -p javy-plugin --target wasm32-wasip1 --release
	) || die "plugin build failed"

	# Build the CLI binary with the system Rust (Gentoo's dev-lang/rust).
	# Its build.rs picks up and processes the wasm plugin.
	local -x CARGO_PROFILE_RELEASE_LTO=off
	cargo_src_compile -p javy-cli
}

src_install() {
	dobin "$(cargo_target_dir)/javy"
	dodoc README.md
}