[all-commits] [llvm/llvm-project] 703038: [Sema] Fix volatile check when testing if a return...

[nullptr-cpp via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 703038b35a864d06e1926237c1568a430417b0b4
      https://github.com/llvm/llvm-project/commit/703038b35a864d06e1926237c1568a430417b0b4
  Author: Yang Fan <nullptr.cpp at gmail.com>
  Date:   2020-11-10 (Tue, 10 Nov 2020)

  Changed paths:
    M clang/lib/Sema/SemaStmt.cpp
    A clang/test/CXX/class/class.init/class.copy.elision/p1.cpp

  Log Message:
  -----------
  [Sema] Fix volatile check when testing if a return object can be implicitly moved

In C++11 standard, to become implicitly movable, the expression in return
statement should be a non-volatile automatic object. CWG1579 changed the rule
to require that the expression only needs to be an automatic object. C++14
standard and C++17 standard kept this rule unchanged. C++20 standard changed
the rule back to require the expression be a non-volatile automatic object.
This should be a typo in standards, and VD should be non-volatile.

Differential Revision: https://reviews.llvm.org/D88295