377e1bd6853118c5b1718503569e5179c40f09b7 |
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08-May-2011 |
Douglas Gregor <dgregor@apple.com> |
Relax the conversion rules for Objective-C GC qualifiers a bit by allowing __weak and __strong to be added/dropped as part of implicit conversions (qualification conversions in C++). A little history: GCC lets one add/remove/change GC qualifiers just about anywhere, implicitly. Clang did roughly the same before, but we recently normalized the semantics of qualifiers across the board to get a semantics that we could reason about (yay). Unfortunately, this tightened the screws a bit too much for GC qualifiers, where it's common to add/remove these qualifiers at will. Overall, we're still in better shape than we were before: we don't permit directly changing the GC qualifier (e.g., __weak -> __strong), so type safety is improved. More importantly, we're internally consistent in our handling of qualifiers, and the logic that allows adding/removing GC qualifiers (but not adding/removing address spaces!) only touches two obvious places. Fixes <rdar://problem/9402499>. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131065 91177308-0d34-0410-b5e6-96231b3b80d8
/external/clang/test/SemaObjCXX/gc-attributes.mm
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