[PATCH] D149380: [clang] Add -Wunused-result-always warning

[Gregory Anders via Phabricator via cfe-commits]

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This flag enables warnings for unused function return values
universally, even for functions which do not have a "warn_unused_result"
attribute.

This is disabled by default as it is far too noisy for most C/C++ code;
however, there are contexts where this is a desirable warning to have
(for example, in safety critical code where ignoring return values is
usually forbidden).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149380

Files:
  clang/include/clang/AST/Expr.h
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/AST/Expr.cpp
  clang/lib/Sema/SemaStmt.cpp
  clang/test/Sema/unused-result-always.c

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