Compile mruby with Cosmopolitan Libc

add.c

# Example of mruby with cosmo.
# Compile with `../cosmo/bin/cosmocc -I ../mruby-3.3.0/build/cosmo/include add.c ../mruby-3.3.0/build/cosmo/lib/libmruby.a -o add`
# To run in Linux, do `./add`; to run in Windows, rename it to "add.com" and run under PowerShell `./add.com`.

#include <mruby.h>
#include <mruby/compile.h>

mrb_value add_int_method(mrb_state *mrb, mrb_value self)
{
  mrb_int a = 0;
  mrb_int b = 0;

  mrb_get_args(mrb, "ii", &a, &b);
  printf("%d + %d = ", a, b);

  return mrb_fixnum_value(a+b);
}

int main(void) {
    mrb_state *mrb = mrb_open();

    mrb_define_method(mrb, mrb->kernel_module, "add_int", add_int_method, MRB_ARGS_REQ(2));

    char code[] = "puts add_int(1,10)";

    mrb_load_string(mrb, code);

    mrb_close(mrb);
    return 0;
}

cosmo.rb

# Put this file under mruby/build_config/
# Compile mruby with `rake MRUBY_CONFIG=cosmo`.
# Run mruby/build/cosmo/bin/mirb for interactive shell.
# Remember to change COSMO_PATH to fit your environment.

MRuby::CrossBuild.new('cosmo') do |conf|
  toolchain :gcc

  COSMO_PATH = "/home/rguiscard/Projects/cosmo/"

  # C compiler
  conf.cc do |cc|
    cc.command = "#{COSMO_PATH}/bin/cosmocc"
    cc.include_paths = ["#{COSMO_PATH}/include", "./include"]
  end

  # C++ compiler
  conf.cxx do |cxx|
    cxx.command = "#{COSMO_PATH}/bin/cosmoc++"
    cxx.include_paths = conf.cc.include_paths.dup
  end

  # Linker
  conf.linker do |linker|
    linker.command = "#{COSMO_PATH}/bin/cosmocc"
    linker.library_paths = ["#{COSMO_PATH}/lib"]
  end

  # Ar
  conf.archiver.command = "#{COSMO_PATH}/bin/cosmoar"

  # All current core gems with ones with build issues commented out
  conf.gembox "stdlib"
  conf.gembox "stdlib-ext"
  conf.gembox "stdlib-io"
#  conf.gem 'mrbgems/mruby-array-ext/'
#  conf.gem 'mrbgems/mruby-bigint/'
#  conf.gem 'mrbgems/mruby-bin-config/'
#  conf.gem 'mrbgems/mruby-bin-debugger/'
  conf.gem 'mrbgems/mruby-bin-mirb/'
  conf.gem 'mrbgems/mruby-bin-mrbc/'
#  conf.gem 'mrbgems/mruby-bin-mruby/'
#  conf.gem 'mrbgems/mruby-bin-strip/'
#  conf.gem 'mrbgems/mruby-binding/'
#  conf.gem 'mrbgems/mruby-catch/'
#  conf.gem 'mrbgems/mruby-class-ext/'
#  conf.gem 'mrbgems/mruby-cmath/'
#  conf.gem 'mrbgems/mruby-compar-ext/'
  conf.gem 'mrbgems/mruby-compiler/'
#  conf.gem 'mrbgems/mruby-complex/'
#  conf.gem 'mrbgems/mruby-data/'
  #conf.gem 'mrbgems/mruby-dir/'
#  conf.gem 'mrbgems/mruby-enum-chain/'
#  conf.gem 'mrbgems/mruby-enum-ext/'
#  conf.gem 'mrbgems/mruby-enum-lazy/'
  #conf.gem 'mrbgems/mruby-enumerator/'
#  conf.gem 'mrbgems/mruby-errno/'
#  conf.gem 'mrbgems/mruby-error/'
#  conf.gem 'mrbgems/mruby-eval/'
#  conf.gem 'mrbgems/mruby-exit/'
#  conf.gem 'mrbgems/mruby-fiber/'
#  conf.gem 'mrbgems/mruby-hash-ext/'
  #conf.gem 'mrbgems/mruby-io/'
#  conf.gem 'mrbgems/mruby-kernel-ext/'
#  conf.gem 'mrbgems/mruby-math/'
#  conf.gem 'mrbgems/mruby-metaprog/'
#  conf.gem 'mrbgems/mruby-method/'
#  conf.gem 'mrbgems/mruby-numeric-ext/'
#  conf.gem 'mrbgems/mruby-object-ext/'
#  conf.gem 'mrbgems/mruby-objectspace/'
#  conf.gem 'mrbgems/mruby-os-memsize/'
#  conf.gem 'mrbgems/mruby-pack/'
  conf.gem 'mrbgems/mruby-print/'
#  conf.gem 'mrbgems/mruby-proc-binding/'
#  conf.gem 'mrbgems/mruby-proc-ext/'
#  conf.gem 'mrbgems/mruby-random/'
#  conf.gem 'mrbgems/mruby-range-ext/'
#  conf.gem 'mrbgems/mruby-rational/'
#  conf.gem 'mrbgems/mruby-set/'
#  conf.gem 'mrbgems/mruby-sleep/'
  #conf.gem 'mrbgems/mruby-socket/'
#  conf.gem 'mrbgems/mruby-sprintf/'
#  conf.gem 'mrbgems/mruby-string-ext/'
#  conf.gem 'mrbgems/mruby-struct/'
#  conf.gem 'mrbgems/mruby-symbol-ext/'
#  conf.gem 'mrbgems/mruby-test-inline-struct/'
  conf.gem 'mrbgems/mruby-test/'
#  conf.gem 'mrbgems/mruby-time/'
#  conf.gem 'mrbgems/mruby-toplevel-ext/'

  # Turn on `enable_debug` for better debugging
  # conf.enable_debug
  conf.enable_bintest
  conf.enable_test
end