From: "hsbt (Hiroshi SHIBATA) via ruby-core" <ruby-core@...>
Date: 2026-03-26T08:54:49+00:00
Subject: [ruby-core:125136] [Ruby Bug#21965] cross compile with out-of-source build is broken

Issue #21965 has been reported by hsbt (Hiroshi SHIBATA).

----------------------------------------
Bug #21965: cross compile with out-of-source build is broken
https://bugs.ruby-lang.org/issues/21965

* Author: hsbt (Hiroshi SHIBATA)
* Status: Open
* Assignee: kddnewton (Kevin Newton)
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN
----------------------------------------
cross compile with out-of-source build is broken since 14th.

I created simple cross-compile workflow with out-of-source build at https://github.com/ruby/ruby/pull/16545 because our CI suite is not covered that case.

`ruby_4_0` branch is working fine: https://github.com/ruby/ruby/actions/runs/23571659532/job/68635350261

`master` branch is broken: https://github.com/ruby/ruby/actions/runs/23574018376/job/68642526668

```
...
making ../src/warning.rbinc
making ../src/gc.rbinc
./dump_ast: 1: ELF

���
@[@������5@8: not found
./dump_ast: 1: %@@@���
���
888��

,���: not found
./dump_ast: 2: ,���: not found
./dump_ast: 3: 

������: not found
...
```

@nobu try to fix that at https://github.com/ruby/ruby/pull/16456





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