Ruby one-click installer issue with extensions

ruby-talk
1

Jeff Mitchell wrote:

···

Immediately after mailing y'all, I realized I should have given a
minimal case rather than even mentioning my package.

Here we go. With the below extension,

-- my mingw32-ruby, extension compiled with mingw32-ruby
   --> success
-- my mingw32-ruby, extension compiled with mswin32-ruby
   --> success
-- my mswin32-ruby, extension compiled with mingw32-ruby
   --> success
-- my mswin32-ruby, extension compiled with mswin32-ruby
   --> success

-- one-click mswin32-ruby, extension compiled with mingw32-ruby
   --> SEGFAULT
-- one-click mswin32-ruby, extension compiled with mswin32-ruby
   --> SEGFAULT

-----------------------------------
# extconf.rb:
require 'mkmf'
create_makefile("myclass")

-----------------------------------
# test.rb
require './myclass.so'
loop { MyClass.new }

-----------------------------------
// myclass.c

#include "ruby.h"

struct MyStruct_
{
    int n ;
} ;

typedef struct MyStruct_ MyStruct ;

void myclass_free(MyStruct* data)
{
    free(data) ;
}

VALUE rb_myclass_initialize( VALUE self )
{
    MyStruct *data;
    Data_Get_Struct(self, MyStruct, data);
    return Qnil ;
}

static VALUE rb_myclass_s_allocate(VALUE klass)
{
    MyStruct* data ;
    VALUE obj = Data_Make_Struct(klass,
                                 MyStruct,
                                 0,
                                 myclass_free,
                                 data) ;
    return obj ;
}

VALUE cMyClass ;

void Init_myclass()
{
    cMyClass = rb_define_class("MyClass", rb_cObject) ;
    rb_define_alloc_func(cMyClass, rb_myclass_s_allocate) ;
    rb_define_method(cMyClass, "initialize", rb_myclass_initialize, 0) ;
}
    
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