Undefined symbols for architecture x86_64: "_rb_funcallv"

Question

I'm trying to call Ruby from C, and for some reason I cannot execute rb_funcall2 nor rb_funcall3. However rb_funcall works.

My example,

Hello.c

#include <ruby.h>

void hello_from_ruby()
{
  if (ruby_setup())
    {
        fprintf(stderr, "Failed to init Ruby VM\n");
    }

    rb_require("/test");
    rb_funcall2(0, rb_intern("some_ruby_method"), 0, NULL);    

    ruby_cleanup(0);
  }

int main(int argc, char* argv[])
{
  hello_from_ruby();
  return 0;
}

test.rb

def some_ruby_method
  puts "Hello from ruby"
end

Command that execute:

clang hello.c  -o hello -I/opt/rubies/2.1.0/include/ruby-2.1.0  -I/opt/rubies/2.1.0/include/ruby-2.1.0/x86_64-darwin14.0  -lruby

The exception:

Undefined symbols for architecture x86_64:
  "_rb_funcallv", referenced from:
      _hello_from_ruby in hello-190761.o
ld: symbol(s) not found for architecture x86_64

For some reason, only these two methods are not being linked. Thanks

My question: How can I link rb_funcall2 on my code

Answer 1

The problem was that my Ruby was compiled using gcc so I had to recompile for clang:

CC=clang CONFIGURE_OPTS="--with-gcc=clang --enable-shared" ruby-build 2.1.0 /opt/rubies/2.1.0

I figure it out after looking into this issue:https://github.com/ryanmelt/qtbindings/issues/72

Thanks.