From: "hsbt (Hiroshi SHIBATA) via ruby-core" <ruby-core@...>
Date: 2025-04-08T10:43:50+00:00
Subject: [ruby-core:121585] [Ruby Bug#21255] Can't build Ruby with Windows SDK 10.0.26100

Issue #21255 has been updated by hsbt (Hiroshi SHIBATA).

Subject changed from Ruby couldn't build with Windows SDK 10.0.26100 to Can't build Ruby with Windows SDK 10.0.26100
Status changed from Open to Assigned
Assignee set to windows

----------------------------------------
Bug #21255: Can't build Ruby with Windows SDK 10.0.26100
https://bugs.ruby-lang.org/issues/21255#change-112641

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Assignee: windows
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
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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