[all-commits] [llvm/llvm-project] 00e5d3: Do not warn that an expression of the form (void)a...

[Richard Smith via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 00e5d38d40162d049f67b436ad42c9d05092e65c
      https://github.com/llvm/llvm-project/commit/00e5d38d40162d049f67b436ad42c9d05092e65c
  Author: Richard Smith <richard at metafoo.co.uk>
  Date:   2020-05-27 (Wed, 27 May 2020)

  Changed paths:
    M clang/include/clang/AST/Expr.h
    M clang/lib/AST/Expr.cpp
    M clang/lib/Sema/SemaExprCXX.cpp
    M clang/test/SemaCXX/warn-unused-value.cpp

  Log Message:
  -----------
  Do not warn that an expression of the form (void)arr; is unused when
arr is a volatile non-local array.

This fixes a recent regression exposed by removing lvalue-to-rvalue
conversion of discarded volatile arrays. In passing, regularize the
rules we use to determine whether '(void)expr;' warns when expr is a
volatile glvalue.