[PATCH] D97831: [Clang][Sema] Implement GCC -Wcast-function-type

[Yuanfang Chen via Phabricator via cfe-commits]

ychen created this revision.
ychen added reviewers: aaron.ballman, rsmith.
ychen requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

  Warn when a function pointer is cast to an incompatible function
  pointer. In a cast involving function types with a variable argument
  list only the types of initial arguments that are provided are
  considered. Any parameter of pointer-type matches any other
  pointer-type. Any benign differences in integral types are ignored, like
  int vs. long on ILP32 targets. Likewise type qualifiers are ignored. The
  function type void (*) (void) is special and matches everything, which
  can be used to suppress this warning. In a cast involving pointer to
  member types this warning warns whenever the type cast is changing the
  pointer to member type. This warning is enabled by -Wextra.

It is not part of -Wextra for now. I could add it if it is preferred.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97831

Files:
  clang/docs/DiagnosticsReference.rst
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaCast.cpp
  clang/test/Sema/warn-cast-function-type.c
  clang/test/Sema/warn-cast-function-type.cpp

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