[PATCH] D53025: [clang-tidy] implement new check for const return types.

[Yitzhak Mandelbaum via Phabricator via cfe-commits]

ymandel created this revision.
ymandel added reviewers: aaron.ballman, JonasToth, ioeric.
Herald added subscribers: cfe-commits, xazax.hun, mgorny.

Adds a new check readability-const-value-return, which checks for functions with
a ``const``-qualified return type and recommends removal of the `const` keyword.
Such use of ``const`` is superfluous, and prevents valuable compiler
optimizations.

Based in part on the (abandoned) review https://reviews.llvm.org/D33531.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D53025

Files:
  clang-tidy/readability/CMakeLists.txt
  clang-tidy/readability/ConstValueReturnCheck.cpp
  clang-tidy/readability/ConstValueReturnCheck.h
  clang-tidy/readability/ReadabilityTidyModule.cpp
  clang-tidy/utils/LexerUtils.cpp
  clang-tidy/utils/LexerUtils.h
  docs/ReleaseNotes.rst
  docs/clang-tidy/checks/list.rst
  docs/clang-tidy/checks/readability-const-value-return.rst
  test/clang-tidy/Inputs/readability-const-value-return/
  test/clang-tidy/Inputs/readability-const-value-return/macro-def.h
  test/clang-tidy/readability-const-value-return.cpp

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