[PATCH] D85097: [Sema] add warning for comparisons like 'x<=y<=z'

[Vince Bridgers via Phabricator via cfe-commits]

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This changes add a new warning named -Wcompare-op-parentheses that's
part of the -Wparentheses diagnostic group. This diagnostic produces a
warning when a pattern like 'x<=y<=z' is found. When this pattern is not
qualified by parentheses, it's equivalent to '(x<=y ? 1 : 0) <= z',
which is a different interpretation from that of ordinary mathematical
notation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D85097

Files:
  clang/docs/DiagnosticsReference.rst
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaExpr.cpp
  clang/test/Misc/warning-wall.c
  clang/test/Sema/warn-compare-op-parentheses.c

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