MRuby compilation example

compile-mruby.sh

#!/usr/bin/env bash
set -eu
set -o pipefail

# variables
mrb_dir="/Users/josh/.rubies/mruby-1.2.0/"
export PATH="$mrb_dir/bin:$PATH"

# Clean up from previous run
rm -f simple_example*

# MRuby program that prints 0, 2, 4, 6, 8
( echo '5.times do |i|'
  echo '  puts i * 2'
  echo 'end'
) > simple_example.rb

# C program to run the mruby program
( echo '#include <stdio.h>'
  echo '#include <mruby.h>'
  echo '#include <mruby/dump.h>'
  echo '#include "simple_example_bytecode.h"'
  echo ''
  echo 'int main() {'
  echo '  mrb_state *mrb = mrb_open();'
  echo '  if (!mrb) {'
  echo '    printf("failed");'
  echo '    return 1;'
  echo '  }'
  echo '  mrb_load_irep(mrb, simple_example_bytecode);'
  echo '  mrb_close(mrb);'
  echo '}'
) > simple_example.c

# Compile the Mruby code into a c header file
mrbc -B simple_example_bytecode -o simple_example_bytecode.h simple_example.rb

# compile to an object file
gcc -std=c99 -I"$mrb_dir/include" -c -o simple_example.o simple_example.c

# link object files
gcc -o simple_example simple_example.o "$mrb_dir/build/host/lib/libmruby.a"

# gcc -std=c99 -I"$mrb_dir/include" -o simple_example simple_example.c "$mrb_dir/build/host/lib/libmruby.a"
./simple_example