"Compaction isn't available on this platform" error running PG test suite on ppc64le

[voxik]

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:

ruby-pg/spec/pg/gc_compact_spec.rb

Line 26 in 6c436bd

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

Therefore I have reported this behavior to Ruby upstream. Unfortunately, it seems that the guard above is not enough by design. Is there any chance to guard not just the compact method availability, but also its functionality?

For the moment, I'm going to disable the entire test file on ppc64le.

[larskanis]

OK, I didn't know, that there are platforms without GC.compact. I'll change the test suite to check for usability of these functions.