[ruby-core:107396] [Ruby master Bug#18560] "Compaction isn't available on this platform" error running PG test suite on ppc64le

Issue #18560 has been updated by mame (Yusuke Endoh).


@peterzhu2118 JFYI: If the method body is `rb_f_notimplement`, `Kernel#respond_to?` returns false.

For example, `Kernel#fork` is defined as such in Windows. https://github.com/ruby/ruby/blob/605f226142a47c4f9e4cc88717c5d6170bc3d7f1/process.c#L4431

```
PS C:\> ruby -ve 'p respond_to?(:fork); fork'
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x64-mingw32]
false
-e:1:in `fork': fork() function is unimplemented on this machine (NotImplementedError)
        from -e:1:in `<main>'
```

However, I think it is currently impossible to define such a method in Ruby code, i.e., `gc.rb`. I have no opinion whether it is worth putting effort on this.

----------------------------------------
Bug #18560: "Compaction isn't available on this platform" error running PG test suite on ppc64le
https://bugs.ruby-lang.org/issues/18560#change-96298

* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [powerpc64le-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Trying to execute test suite of `pg` gem on ppc64le, I observe a following error:

~~~
... snip ...

  1) GC.compact should compact PG::TypeMapByClass #328
     Failure/Error: GC.verify_compaction_references(toward: :empty, double_heap: true)
     NotImplementedError:
       Compaction isn't available on this platform
     # <internal:gc>:257:in `verify_compaction_references'
     # ./spec/pg/gc_compact_spec.rb:58:in `block (2 levels) i

... snip ...
~~~

This is surprising, given that the test suite seems to do reasonable effort to guard this behavior [1]:

~~~
... snip ...

describe "GC.compact", if: GC.respond_to?(:compact) do

... snip ...
~~~

Is this expected or bug?



[1]: https://github.com/ged/ruby-pg/blob/6c436bda9aaf7bc053ef348afd99e2e035d5d0a3/spec/pg/gc_compact_spec.rb#L26



-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:[e-mail]?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>