Build Ruby for iOS

build_ruby_ios.sh

#!/bin/bash

wget https://cache.ruby-lang.org/pub/ruby/3.0/ruby-3.0.2.tar.gz
tar -zxvf ruby-3.0.2.tar.gz

cd ruby-3.0.2

./configure --prefix=/tmp \
  --build=x86_64-apple-darwin20 \
  --target=aarch64-apple-darwin20 \
  --with-gmp=/usr/local/opt/gmp \
  --with-mpfr=/usr/local/opt/mpfr \
  --with-mpc=/usr/local/opt/libmpc \
  --with-isl=/usr/local/opt/isl \
  --with-native-system-header-dir=/usr/include \
  --with-sysroot=$(xcrun --sdk iphoneos --show-sdk-path) \
  AS_FOR_TARGET=/usr/bin/as LD_FOR_TARGET=/usr/bin/ld \
  NM_FOR_TARGET=/usr/bin/nm RANLIB_FOR_TARGET=/usr/bin/ranlib \
  AR_FOR_TARGET=/usr/bin/ar LIPO_FOR_TARGET=/usr/bin/lipo \
  --disable-multilib

make CC="$(xcrun --sdk iphoneos --find clang) -fdeclspec -isysroot $(xcrun --sdk iphoneos --show-sdk-path) -arch armv7 -arch armv7s -arch arm64"
make install  # ruby and headers, etc will be in /tmp directory