[PATCH] D45015: [Preprocessor] Allow libc++ to detect when aligned allocation is unavailable.

[Eric Fiselier via Phabricator via cfe-commits]

EricWF updated this revision to Diff 149596.
EricWF edited the summary of this revision.
EricWF added a comment.

Update the patch with the form suggested in the previous conversation. See the updated summary for a description of the behavior.

The Darwin driver no longer passes `-faligned-alloc-unavailable` when `-nostdinc++` is specified, but I'm not sure this is the behavior
we want.  Having `-nostdinc++` have side-effects which affect the well-formedness of new/delete expressions seems non-obvious and potentially problematic.


https://reviews.llvm.org/D45015

Files:
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Driver/ToolChains/Darwin.cpp
  lib/Frontend/InitPreprocessor.cpp
  lib/Sema/SemaExprCXX.cpp
  test/Driver/unavailable_aligned_allocation.cpp
  test/Lexer/aligned-allocation.cpp

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