[PATCH] D132851: Further update -Wbitfield-constant-conversion for 1-bit bitfield

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman created this revision.
aaron.ballman added reviewers: ShawnZhong, thakis, clang-language-wg, erichkeane.
Herald added a project: All.
aaron.ballman requested review of this revision.
Herald added a project: clang.

https://reviews.llvm.org/D131255 (82afc9b169a67e8b8a1862fb9c41a2cd974d6691 <https://reviews.llvm.org/rG82afc9b169a67e8b8a1862fb9c41a2cd974d6691>) began warning about conversion causing data loss for a single-bit bit-field. However, after landing the changes, there were reports about significant false positives from some code bases.

This alters the approach taken in that patch by introducing a new warning group (`-Wsingle-bit-bitfield-constant-conversion`) which is grouped under `-Wbitfield-constant-conversion` to allow users to selectively disable the single-bit warning without losing the other constant conversion warnings.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132851

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaChecking.cpp
  clang/test/CXX/drs/dr6xx.cpp
  clang/test/Sema/constant-conversion.c

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