[Preprocessor] Allow libc++ to detect when aligned allocation is unavailable.
Libc++ needs to know when aligned allocation is supported by clang, but is
otherwise unavailable at link time. Otherwise, libc++ will incorrectly end up
generating calls to `__builtin_operator_new`/`__builtin_operator_delete` with
alignment arguments.
This patch implements the following changes:
* The `__cpp_aligned_new` feature test macro to no longer be defined when
aligned allocation is otherwise enabled but unavailable.
* The Darwin driver no longer passes `-faligned-alloc-unavailable` when the
user manually specifies `-faligned-allocation` or `-fno-aligned-allocation`.
* Instead of a warning Clang now generates a hard error when an aligned
allocation or deallocation function is referenced but unavailable.
Patch by Eric Fiselier.
Reviewers: rsmith, vsapsai, erik.pilkington, ahatanak, dexonsmith
Reviewed By: rsmith
Subscribers: Quuxplusone, cfe-commits
Differential Revision: https://reviews.llvm.org/D45015
llvm-svn: 338934
diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index a1168fa..22f1328 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -1741,9 +1741,9 @@
StringRef OSName = AvailabilityAttr::getPlatformNameSourceSpelling(
S.getASTContext().getTargetInfo().getPlatformName());
- S.Diag(Loc, diag::warn_aligned_allocation_unavailable)
- << IsDelete << FD.getType().getAsString() << OSName
- << alignedAllocMinVersion(T.getOS()).getAsString();
+ S.Diag(Loc, diag::err_aligned_allocation_unavailable)
+ << IsDelete << FD.getType().getAsString() << OSName
+ << alignedAllocMinVersion(T.getOS()).getAsString();
S.Diag(Loc, diag::note_silence_unligned_allocation_unavailable);
}
}