Issue #20981 has been updated by KitaitiMakoto (真 北市). Thank you! I confirmed my code works fine in Ruby `master` branch. ---------------------------------------- Bug #20981: rb_undefine_finalizer is missing https://bugs.ruby-lang.org/issues/20981#change-111188 * Author: KitaitiMakoto (真 北市) * Status: Closed * ruby -v: 3.4.1 * Backport: 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED ---------------------------------------- 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-L32...) 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. -- https://bugs.ruby-lang.org/