From: Yusuke Endoh <mame@...>
Date: 2012-11-06T23:53:59+09:00
Subject: [ruby-core:48979] Re: [ANN] ruby 2.0.0-preview1 released

Hello Vit,

2012/11/6 V�t Ondruch <v.ondruch@gmail.com>:
> 2012/11/2 Yusuke Endoh <mame@tsg.ne.jp>
>>
>> We have taken considerable care in source-level compatibility with
>> 1.9.  We believe all "normal" programs will work without modification.
>> So, please give it a try, and report if your program does not work.
>
>
> Does it mean that Ruby 2.0 will breaks ABI, e.g. the ABI will be 2.0.0
> instead of 1.9.1 (as it was for Ruby 1.9.3).

Yes, ABI will be incompatible with 1.9.1.  So, to be precise:

- You can use existing "normal" Ruby scripts without modification

- You can use "normal" source code of existing extenstion libraries
  without modification, but re-compilation is needed.

Note: #6679 was introduced after preview1, which may cause a big
compatibility issue, especially, for non-utf-8 users.  We will
estimate the impact with preview2 release.

BTW: I'm thinking to change the ABI version *name*.  Ruby 2.0.1 will
use the same ABI version "2.0.0", which is very confusing, based on
the experience of "1.9.1".  I'd like to name it "2.0", but I must
talk with matz.


>  I am just asking, since the .so
> file is currently named libruby.2.0.0.so and abi-compliance-checker confirms
> it (see attachment).

Thank you, very interesting.
The following functions (or global variables) disappered, right?
We should check each if the deletion won't cause compatibility issue.

Removed Symbols (25)
  OnigSyntaxPerl_NG [data]
  rb_barrier_destroy ( ... )
  rb_barrier_new ( ... )
  rb_barrier_release ( ... )
  rb_barrier_wait ( ... )
  rb_disable_interrupt ( ... )
  rb_enable_interrupt ( ... )
  rb_file_const ( ... )
  rb_file_load_ok ( ... )
  rb_float_new ( ... )
  rb_gc_mark_parser ( ... )
  rb_gc_mark_symbols ( ... )
  rb_gc_mark_threads ( ... )
  rb_infinity [data]
  rb_load_fail ( ... )
  rb_mark_end_proc ( ... )
  rb_nan [data]
  rb_path_end ( ... )
  rb_path_last_separator ( ... )
  rb_path_next ( ... )
  rb_path_skip_prefix ( ... )
  rb_vm_get_sourceline ( ... )
  rb_vm_make_env_object ( ... )
  ruby_find_basename ( ... )
  ruby_find_extname ( ... )

-- 
Yusuke Endoh <mame@tsg.ne.jp>