Someone created a fork, which essentially adds a script to build LuaJIT for the several architectures needed by iOS, then combines them using lipo: github.com/cailei/luajit.
I updated the script by taking the latest SDK versions and removing the reference to gcc inside the Xcode bundle:
#/bin/sh
# Check if the binary exists.
# if [ -f "lib/libluajit.a" ]; then
# exit 0
# fi
if [ ! -d lib/temp ]; then
mkdir -p lib/temp
fi
IXCODE=`xcode-select -print-path`
# Build for MacOS (x86_64)
echo "Building for macOS x86_84"
ISDK=$IXCODE/Platforms/MacOSX.platform/Developer
ISDKVER=MacOSX10.12.sdk
ISDKP=$ISDK/usr/bin/
ISDKF="-arch x86_64 -isysroot $ISDK/SDKs/$ISDKVER"
make clean
make TARGET_FLAGS="-arch x86_64"
mv src/libluajit.a lib/temp/libluajit-macos-x86_64.a
# Build for iOS device (armv7)
echo "Building for iOS armv7"
ISDK=$IXCODE/Platforms/iPhoneOS.platform/Developer
ISDKVER=iPhoneOS10.2.sdk
ISDKP=/usr/bin/
ISDKF="-arch armv7 -isysroot $ISDK/SDKs/$ISDKVER"
make clean
make HOST_CC="gcc -m32 -arch i386" CROSS=$ISDKP TARGET_FLAGS="$ISDKF" \
TARGET_SYS=iOS
mv src/libluajit.a lib/temp/libluajit-ios-armv7.a
# Build for iOS device (armv7s)
echo "Building for iOS armv7s"
ISDKF="-arch armv7s -isysroot $ISDK/SDKs/$ISDKVER"
make clean
make HOST_CC="gcc -m32 -arch i386" CROSS=$ISDKP TARGET_FLAGS="$ISDKF" \
TARGET_SYS=iOS
mv src/libluajit.a lib/temp/libluajit-ios-armv7s.a
# Build for iOS simulator
echo "Building for iOS Simulator"
ISDK=$IXCODE/Platforms/iPhoneSimulator.platform/Developer
ISDKVER=iPhoneSimulator10.2.sdk
ISDKP=/usr/bin/
ISDKF="-arch i386 -isysroot $ISDK/SDKs/$ISDKVER"
make clean
make HOST_CFLAGS="-arch i386" HOST_LDFLAGS="-arch i386" TARGET_SYS=iOS TARGET=x86 CROSS=$ISDKP TARGET_FLAGS="$ISDKF" \
TARGET_SYS=iOS
mv src/libluajit.a lib/temp/libluajit-simulator.a
# Combine all archives to one.
libtool -o lib/libluajit.a lib/temp/*.a 2> /dev/null
rm -rf lib/temp
make clean
The script works seamlessly with LuaJIT 2.0.4.
Unfortunately, LuaJIT does not support the arm64 architecture yet.