rjmccall added a comment.
These were unavailable in system headers before because otherwise we would've
had to make them invalid. Since these unions are no longer otherwise invalid,
there shouldn't be a problem with allowing them in system headers, and in fact
making the semantics vary that way seems quite problematic. Now, specific
*uses* in system headers might still appear to be invalid — e.g. an ObjC ivar
of type `union { __strong id x; }` — and the right behavior is definitely that
those use sites should be marked as invalid instead of refusing to compile the
system header.
Repository:
rC Clang
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D65256/new/
https://reviews.llvm.org/D65256
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