llvmbot wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

<details>
<summary>Changes</summary>

…macros

As per review comments on https://reviews.llvm.org/D150226, we should allow for 
one more release before turning this warning into a hard error, by making it 
visible in system headers and macros, so that people are aware of it and can 
work on it.

---
Full diff: https://github.com/llvm/llvm-project/pull/67528.diff


2 Files Affected:

- (modified) clang/docs/ReleaseNotes.rst (+3) 
- (modified) clang/include/clang/Basic/DiagnosticASTKinds.td (+2-1) 


``````````diff
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 477a40630f11097..3b6cfa776c85e46 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -67,6 +67,9 @@ C++ Specific Potentially Breaking Changes
   (`#49884 <https://github.com/llvm/llvm-project/issues/49884>`_), and
   (`#61273 <https://github.com/llvm/llvm-project/issues/61273>`_)
 
+- The warning `-Wenum-constexpr-conversion` is now also enabled by default on 
system headers and
+  macros. It will be turned into a hard (non-downgradable) error in the next 
Clang release.
+
 ABI Changes in This Version
 ---------------------------
 - Following the SystemV ABI for x86-64, ``__int128`` arguments will no longer
diff --git a/clang/include/clang/Basic/DiagnosticASTKinds.td 
b/clang/include/clang/Basic/DiagnosticASTKinds.td
index d2656310e79c9b8..0019553233fdef6 100644
--- a/clang/include/clang/Basic/DiagnosticASTKinds.td
+++ b/clang/include/clang/Basic/DiagnosticASTKinds.td
@@ -405,7 +405,8 @@ def warn_fixedpoint_constant_overflow : Warning<
   InGroup<DiagGroup<"fixed-point-overflow">>;
 def warn_constexpr_unscoped_enum_out_of_range : Warning<
   "integer value %0 is outside the valid range of values [%1, %2] for the "
-  "enumeration type %3">, DefaultError, 
InGroup<DiagGroup<"enum-constexpr-conversion">>;
+  "enumeration type %3">, DefaultError, ShowInSystemHeader, ShowInSystemMacro,
+  InGroup<DiagGroup<"enum-constexpr-conversion">>;
 
 // This is a temporary diagnostic, and shall be removed once our
 // implementation is complete, and like the preceding constexpr notes belongs

``````````

</details>


https://github.com/llvm/llvm-project/pull/67528
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