From: "k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date: 2025-07-14T21:14:17+00:00
Subject: [ruby-core:122758] [Ruby Bug#21255] Can't build Ruby with Windows SDK 10.0.26100

Issue #21255 has been updated by k0kubun (Takashi Kokubun).

Backport changed from 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: DONE, 3.4: DONE

ruby_3_4 commit:309b1aaf1f.

----------------------------------------
Bug #21255: Can't build Ruby with Windows SDK 10.0.26100
https://bugs.ruby-lang.org/issues/21255#change-114037

* Author: hsbt (Hiroshi SHIBATA)
* Status: Closed
* Assignee: windows
* Backport: 3.2: REQUIRED, 3.3: DONE, 3.4: DONE
----------------------------------------
I tried to build ruby.exe with Windows SDK 10.0.26100. But it failed with:

```
dmyext.obj dmyenc.obj
linking shared-library x64-vcruntime140-ruby350.dll
x64-vcruntime140-ruby350.def : error LNK2001: ������������������ "Avx2WmemEnabledWeakValue" ���������������������
dummy.lib : fatal error LNK1120: 1 ������������������������������
```

(This message is the japanese edition of VS2019 Ver.16.11.45)

I and @nobu faced the same issue at GitHub Actions.

```
x64-vcruntime140-ruby350.def : error LNK2001: unresolved external symbol Avx2WmemEnabledWeakValue
```

https://github.com/nobu/ruby/actions/runs/13630688130/job/38097613034#step:20:1516

I resolved this issue to downgrade Windows SDK to 10.0.22261.



-- 
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