Re: [boost] [type_traits] is_list_constructible regression failures

Subject: Re: [boost] [type_traits] is_list_constructible regression failures
From: John Maddock (jz.maddock_at_[hidden])
Date: 2018-03-13 08:56:22

On 12/03/2018 19:50, Peter Dimov via Boost wrote:
> John Maddock wrote:
>> On 12/03/2018 19:07, Lorenzo Caminiti via Boost wrote:
>> > Hello all,
>> >
>> > I noticed the following failure in Boost.TypeTraits regression 
>> tests on > GCC 4.6 C++11. Any idea why this is failing?
>>
>> There's something different about that tester - there are several 
>> gcc-4.6 test runners in the matrix and they're all passing
> is_list_constructible_test bar that one.  What/why the difference is 
> there I have no idea :(
>
> It's possible that this is the only 4.6 tester that uses -std=c++0x. 
> is_list_constructible has
>
> #if defined(BOOST_NO_SFINAE_EXPR) || 
> defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || 
> defined(BOOST_NO_CXX11_DECLTYPE) || 
> defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) || 
> defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
>
> but that's apparently not enough to disable it on 4.6. (It's probably 
> the derivation from `decltype` that confuses the compiler.)
>
> Travis does have 4.4 and 4.6, so we may want to add these to Type Traits.
>
> https://github.com/boostorg/smart_ptr/commit/77a35856c6f51176dc15c00f0e4ca95097f803ff 
>

Thanks, added.

John.

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