[PATCH] [bug21156] Partial specialization after implicit/explicit instantiation of class template.

[David Blaikie]

(it's helpful to attach the patch directly to the review thread here,
rather than (or at least in addition to) the bug - makes it easier for
people to find and review)

& rather than creating other threads on the subject (I just saw your mail
to cfe-dev), it's reasonable to ping a review thread (simply reply-all with
the word 'ping') every week or so. Sometimes it takes a little while for
people to get to things, though I don't imagine it'll take too long.

http://llvm.org/docs/DeveloperPolicy.html#making-and-submitting-a-patch
discusses some of these issues.

On Sat, Oct 4, 2014 at 6:34 AM, Anton Bikineev <ant.bikineev at gmail.com>
wrote:

> Hi all,
>
> I recently found that Clang doesn't behave similiar as GCC
> in case of partial specialization ater implicit or explicit
> specialization of class template. GCC gives diagnostic like
>
> "error: partial specialization of 'A<const T*>' after instantiation of
> 'A<const char*>'"
>
> while Clang just ignores it.
>
> C++ [temp.class.spec]p.1 says, that:
> "A partial specialization shall be declared before the first
> use of a class template specialization that would make use of
> the partial specialization as the result of an implicit or explicit
> instantiation in every translation unit in which such a use occurs;
> no diagnostic is required."
>
> I'm not sure, probably Clang has its own politics for this. I also
> submitted a bug http://llvm.org/bugs/show_bug.cgi?id=21156 and
> wrote a patch, which I attached to bug.
>
> I just was wondering, does it really make sense? I'm kind of newbie
> in Clang and my code may be incorrect.
>
> Thanks in advance.
>
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