[PATCH] D135545: [clang] Mention -Werror changes revived for Clang 16

[Michał Górny via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG2bb86b674476: [clang] Mention -Werror changes revived for Clang 16 (authored by thesamesam, committed by mgorny).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D135545/new/

https://reviews.llvm.org/D135545

Files:
  clang/docs/ReleaseNotes.rst


Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -61,6 +61,17 @@
   into an error-only diagnostic in the next Clang release. Fixes
   `Issue 50055 <https://github.com/llvm/llvm-project/issues/50055>`_.
 
+- The ``-Wimplicit-function-declaration`` and ``-Wimplicit-int`` warnings
+  now default to an error in C99, C11, and C17. As of C2x,
+  support for implicit function declarations and implicit int has been removed,
+  and the warning options will have no effect. Specifying ``-Wimplicit-int`` in
+  C89 mode will now issue warnings instead of being a noop.
+
+  **NOTE**: We recommend that projects using configure scripts verify that the
+  results do not change before/after setting
+  ``-Werror=implicit-function-declarations`` or ``-Wimplicit-int`` to avoid
+  incompatibility with Clang 16.
+
 - ``-Wincompatible-function-pointer-types`` now defaults to an error in all C
   language modes. It may be downgraded to a warning with
   ``-Wno-error=incompatible-function-pointer-types`` or disabled entirely with


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