[PATCH] D123627: Correctly diagnose prototype redeclaration errors in C

[Eli Friedman via Phabricator via cfe-commits]

efriedma added a comment.

If the declaration we're redeclaring is a builtin, should the diagnostic be in the "-Wincompatible-library-redeclaration" warning group?  With this patch, we treat redefinitions of builtins without a prototype differently from redefinitions with a prototype, for example:

  void acos() {} // error
  void acos(void) {} // warning

Just ran into some code in Android which is using the first form.


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D123627