ruby/dmyext.c

// This file is used by dynamically-linked ruby and miniruby.
// miniruby uses this Init_ext, which does nothing. It does not support require'ing extension libraries.
// Dynamically-linked ruby uses this Init_ext, which does nothing. It loads extension libraries by dlopen, etc.
// Statically-linked ruby does not use this Init_ext. Instead, "ext/extinit.c" (which is a generated file) defines Init_ext, which activates the (statically-linked) extension libraries.

void
Init_ext(void)
{
}