[cfe-dev] clang++: std::is_aggregate unusable with clang-5.0/libstdc++-7

[Eric Fiselier via cfe-dev]

I've passed this information Jonathan Wakely so that he can correct it.

/Eric

On Tue, Jul 11, 2017 at 7:02 AM, Richard Smith via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> On 8 July 2017 at 06:16, Katsuhiko Nishimra <ktns.87 at gmail.com> wrote:
>
>> On Fri, Jul 07, 2017 at 12:50:24PM -0700, Richard Smith wrote:
>> > __has_builtin detects builtin functions. __is_aggregate is not a builtin
>> > function -- it's not a function at all, since it takes a type, not a
>> value.
>> > But if libstdc++7 is assuming that __has_builtin can be used to detect
>> type
>> > trait keywords, perhaps we should make it so; it's not unreasonable to
>> > expect it to be usable for this purpose.
>>
>> I see. Sorry to have misunderstood.
>> >
>> > Would you be interested in providing a patch to Clang to implement this?
>>
>> I don't know much about Clang's codebase, so I think it's better to send
>> one to libstdc++. But how can I detect if __is_aggregate macro is
>> usable? I've tried #ifdef directive but with no luck.
>>
>
> I think !__is_identifier(__is_aggregate) is the only way we have to
> detect this right now.
>
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