llvmbot wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Aaron Ballman (AaronBallman)

<details>
<summary>Changes</summary>

In discussion of #<!-- -->186196, it started to become clear that claiming full 
conformance to this feature was premature because there are still outstanding 
implementation issues and standards questions with the feature. Claiming full 
conformance gives users a false impression that we think the implementation is 
production quality and that won't change our implementation in breaking ways, 
but I believe that we want some flexibility here and it's more accurate to say 
we only partially support the feature at the moment.

Note, this is not saying we expect to break the code from that issue, just 
listing where the discussion took place that led to this patch.

---
Full diff: https://github.com/llvm/llvm-project/pull/187495.diff


1 Files Affected:

- (modified) clang/www/c_status.html (+8-1) 


``````````diff
diff --git a/clang/www/c_status.html b/clang/www/c_status.html
index aca71728e676c..a909a1fb3013e 100644
--- a/clang/www/c_status.html
+++ b/clang/www/c_status.html
@@ -997,7 +997,14 @@ <h2 id="c2x">C23 implementation status</h2>
     <tr>
       <td>Improved tag compatibility</td>
       <td><a 
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3037.pdf";>N3037</a></td>
-      <td class="full" align="center">Clang 21</td>
+      <td class="partial" align="center">
+        <details><summary>Partial</summary>
+          Clang supports much of this feature starting with Clang 21, but there
+          are implementation bugs and open questions around handling of
+          attributes or other compiler extensions. As a result, some structure
+          definitions may be incorrectly accepted or rejected and so there is a
+          potential for breaking changes in the future.
+        </details>
     </tr>
     <tr>
       <td>#embed</td>

``````````

</details>


https://github.com/llvm/llvm-project/pull/187495
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