[ruby-core:120406] [Ruby master Bug#20981] rb_undefine_finalizer is missing

["nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20981 has been updated by nobu (Nobuyoshi Nakada).


Hmmm, these symbols disappeared.

```console
$ comm -23 <(nm -PUg 3.3.6/lib/libruby.dylib | cut -d' ' -f1) <(nm -PUg 3.4.1/lib/libruby.dylib | cut -d' ' -f1)
_rb_ary_memsize
_rb_ast_add_mark_object
_rb_ast_delete_mark_object
_rb_ast_mark
_rb_ast_set_tokens
_rb_ast_tokens
_rb_ast_update_references
_rb_autoload
_rb_file_s_birthtime
_rb_fstring
_rb_gc_force_recycle
_rb_gc_verify_internal_consistency
_rb_generic_ivar_memsize
_rb_grantpt
_rb_hash_tbl_raw
_rb_io_memsize
_rb_newobj
_rb_newobj_of
_rb_objspace_data_type_memsize
_rb_objspace_each_objects_without_setup
_rb_objspace_markable_object_p
_rb_objspace_marked_object_p
_rb_parser_calloc
_rb_parser_free
_rb_parser_malloc
_rb_parser_realloc
_rb_ruby_parser_compile_string
_rb_st_init_existing_table_with_size
_rb_st_replace
_rb_str_locktmp_ensure
_rb_str_make_embedded
_rb_str_memsize
_rb_str_reembeddable_p
_rb_str_size_as_embedded
_rb_str_tmp_frozen_no_embed_acquire
_rb_str_upto_each
_rb_str_upto_endless_each
_rb_undefine_finalizer
```

`rb_gc_force_recycle` is now defined as `static inline` in include/ruby/internal/gc.h.

Probably only `rb_undefine_finalizer` is problematic?

----------------------------------------
Bug #20981: rb_undefine_finalizer is missing
https://bugs.ruby-lang.org/issues/20981#change-111185

* Author: KitaitiMakoto (真 北市)
* Status: Open
* ruby -v: 3.4.1
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Merry Christmas!

I encountered an error like "dyld[89037]: missing symbol called" in an extension which uses`rb_undefine_finalizer` in Ruby 3.4.1. It works fine in Ruby 3.3.6.

The function defined in [ruby/include/ruby/internal/gc.h](https://github.com/ruby/ruby/blob/v3_4_1/include/ruby/internal/gc.h#L315-L326) but seems removed from [ruby/gc.c](https://github.com/ruby/ruby/blob/v3_4_1/gc.c). Could you consider restore the implementation or remove the function from `gc.h`?

Reproducible code:

### extconf.rb ###
```ruby
require "mkmf"
create_makefile "undefine_finalizer_bug"
```


### undefine_finalizer_bug.c ###
```c
#include<ruby.h>

static VALUE s_undefine_finalizer(VALUE self) {
  rb_undefine_finalizer(self);
  return Qnil;
}

void Init_undefine_finalizer_bug(void) {
  VALUE klass = rb_define_class("UndefineFinalizerBug", rb_cObject);
  rb_define_singleton_method(klass, "undefine_finalizer", s_undefine_finalizer, 0);
}
```

### undefine-finalizer-bug.rb ###
```ruby
require "undefine_finalizer_bug.so"

finalizer = proc {
  puts "Finalizer called"
}

ObjectSpace.define_finalizer(UndefineFinalizerBug, finalizer)
UndefineFinalizerBug.new
UndefineFinalizerBug.undefine_finalizer
GC.start
```

### Running ###
#### Ruby 3.4.1 ##
```
% ruby ./extconf.rb && make && ruby -v -I. ./undefine-finalizer-bug.rb
creating Makefile
linking shared-object undefine_finalizer_bug.bundle
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [arm64-darwin24]
dyld[2436]: missing symbol called
[1]    2436 abort      ruby -v -I. ./undefine-finalizer-bug.rb
```

#### Ruby 3.3.6 ####
```
% chruby-exec 3.3.6 -- ruby ./extconf.rb && make && chruby-exec 3.3.6 -- ruby -v -I. ./undefine-finalizer-bug.rb
creating Makefile
linking shared-object undefine_finalizer_bug.bundle
ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [arm64-darwin24]
```


Thank you.




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