bevy/examples/mobile/build_rust_deps.sh

#!/usr/bin/env bash

# based on https://github.com/mozilla/glean/blob/main/build-scripts/xc-universal-binary.sh

set -eux

PATH=$PATH:$HOME/.cargo/bin

RELFLAG=
if [[ "$CONFIGURATION" != "Debug" ]]; then
    RELFLAG=--release
fi

set -euvx

if [[ -n "${DEVELOPER_SDK_DIR:-}" ]]; then
  # Assume we're in Xcode, which means we're probably cross-compiling.
  # In this case, we need to add an extra library search path for build scripts and proc-macros,
  # which run on the host instead of the target.
  # (macOS Big Sur does not have linkable libraries in /usr/lib/.)
  export LIBRARY_PATH="${DEVELOPER_SDK_DIR}/MacOSX.sdk/usr/lib:${LIBRARY_PATH:-}"
fi

# add homebrew bin path, as it's the most commonly used package manager on macOS
# this is needed for cmake on apple arm processors as it's not available by default
export PATH="$PATH:/opt/homebrew/bin"

IS_SIMULATOR=0
if [ "${LLVM_TARGET_TRIPLE_SUFFIX-}" = "-simulator" ]; then
  IS_SIMULATOR=1
fi

for arch in $ARCHS; do
  case "$arch" in
    x86_64)
      if [ $IS_SIMULATOR -eq 0 ]; then
        echo "Building for x86_64, but not a simulator build. What's going on?" >&2
        exit 2
      fi

      # Intel iOS simulator
      export CFLAGS_x86_64_apple_ios="-target x86_64-apple-ios"
      cargo rustc --crate-type staticlib --lib $RELFLAG --target x86_64-apple-ios
      ;;

    arm64)
      if [ $IS_SIMULATOR -eq 0 ]; then
        # Hardware iOS targets
        cargo rustc --crate-type staticlib --lib $RELFLAG --target aarch64-apple-ios
      else
        # M1 iOS simulator -- currently in Nightly only and requires to build `libstd`
        cargo rustc --crate-type staticlib --lib $RELFLAG --target aarch64-apple-ios-sim
      fi
  esac
done