build-rust-native-library.sh
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build-rust-native-library.sh
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	#!/usr/bin/env bash

	set -euxo pipefail

	COMM_NIX_PATH="$HOME/.cache/comm/path"
	PRJ_ROOT="$(git rev-parse --show-toplevel)"

	# If in nix environment, re-expose nix PATH
	if [[ -f "$COMM_NIX_PATH" ]]; then
	# shellcheck source=/dev/null
	source "$COMM_NIX_PATH"
	fi

	# The $PATH used by Xcode likely won't contain Cargo, fix that.
	# In addition, the $PATH used by XCode has lots of Apple-specific
	# developer tools that your Cargo isn't expecting to use, fix that.
	# Note: This assumes a default `rustup` setup and default path.
	build_path="$HOME/.cargo/bin:/usr/local/bin:/usr/bin:/bin${PATH:+:}$PATH"

	# cd to Cargo project
	cd "${SRCROOT}/../native_rust_library" \|\| exit

	# Ensure rust tooling is available
	env PATH="${build_path}" "$PRJ_ROOT/scripts/ensure_rustup_setup.sh"

	# Set C++ standard and build cxx bridge
	export CXXFLAGS="-std=c++14"
	env PATH="${build_path}" cargo build --release
	# Build universal static library (works on simulator and iOS)
	env PATH="${build_path}" cargo lipo --release
	# Unset the flag specifying C++ standard
	unset CXXFLAGS
	# Copy the CXX files to the cargo project root to make them
	# available to XCode
	cp "$(readlink target/cxxbridge/native_rust_library/src/lib.rs.cc)" .
	cp "$(readlink target/cxxbridge/native_rust_library/src/lib.rs.h)" .
	cp "$(readlink target/cxxbridge/rust/cxx.h)" .