> On Jan 4, 2018, at 8:29 PM, David Zarzycki <d...@znu.io> wrote: > > Hi Adrian, > > Feel free to file a bug if you’re motivated. Personally speaking, I don’t > expect this bug to be on anybody’s priority list. The workaround of using > named structs/unions has no downside for most projects, and Swift is no > exception.
Filed as https://bugs.llvm.org/show_bug.cgi?id=35832 <https://bugs.llvm.org/show_bug.cgi?id=35832> John. > > Dave > > -- > Sent from my iPad > >> On Jan 4, 2018, at 20:11, Adrian Prantl <apra...@apple.com> wrote: >> >> >> >>>> On Dec 16, 2017, at 10:31 AM, John McCall via swift-dev >>>> <swift-dev@swift.org> wrote: >>>> >>>> >>>> On Dec 16, 2017, at 9:08 AM, David Zarzycki via swift-dev >>>> <swift-dev@swift.org> wrote: >>>> >>>> Hello, >>>> >>>> I’m trying to improve SILNode memory layout density by adopting the AST >>>> bitfield macros. Unfortunately, multiple inheritance doesn’t seem to get >>>> along with anonymous/unnamed unions. Here is a distillation of the problem: >>>> >>>> class B { >>>> protected: >>>> int i; >>>> union { int j; }; >>>> }; >>>> >>>> class X : public B { }; >>>> class Y : public B { }; >>>> >>>> class Z : public X, public Y { >>>> int a() { return X::i; } // works >>>> int b() { return X::j; } // fails >>>> }; >>>> >>>> Is this expected C++ behavior? I can certainly workaround this by naming >>>> the unnamed union, but before I do, I thought that I should check here >>>> first. >>> >>> This seems like a bug; anonymous unions are just supposed to inject their >>> member names into the containing scope as if there was an ordinary member >>> there, and the explicit scope-qualification should resolve which subobject >>> is meant for such injected names the same it resolves them for ordinary >>> fields. But if it's a bug in all existing clangs, it's a bug we're going >>> to have to work around. >> >> Which should not prevent Dave from still reporting it on >> https://bugs.llvm.org/enter_bug.cgi?product=clang :-) >> >> -- adrian >
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