On Wed, Dec 17, 2014 at 6:58 PM, Nico Weber <[email protected]> wrote: > > Don't drop attributes when checking explicit specializations. > > Consider a template class with attributes on a method, and an explicit > specialization of that method: > > template <int> > struct A { > void foo() final; > }; > > template <> > void A<0>::foo() {} > > In this example, the attribute is `final`, but it might also be an > __attribute__((visibility("foo"))), noreturn, inline, etc. clang's current > behavior is to strip all attributes, which for some attributes is wrong > (the snippet above allows a subclass of A<0> to override the final method, > for > example) and for others disagrees with gcc (__attribute__((visibility()))). > > So stop dropping attributes. r95845 added this code without a test case, > and > r176728 added the code for dropping attributes on parameters (with tests, > but > they still pass). > > As an additional wrinkle, do drop dllimport and dllexport, since that's > how these two > attributes work. (This is covered by existing tests.) > > Fixes PR21942. > > The approach is by Richard Smith, initial analysis and typing was done by > me. >
Naturally, this makes sense to me =) It also matches GCC and EDG on all attributes I tested. John, do you remember why you added this code (a long long time ago)?
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