[Interest] How do you want to select exactly C++11 with GCC 6+?

[Krzysztof Kawa]

2017-03-10 18:36 GMT+01:00 Thiago Macieira <thiago.macieira at intel.com>:
> On sexta-feira, 10 de março de 2017 00:31:03 PST Krzysztof Kawa wrote:
>> I'd say if the option is called c++11 it should enable c++11 and
>> nothing else (if compiler supports that).
>
> Turning the argument around: is it ok for
>         CONFIG += c++11
>
> to *disable* C++14 that was already enabled by default in your compiler?

I'd say yes. If you specify c++11 you want c++11 (for whatever
reason). Existing code won't stop working if you drop from the default
c++14 because it already targeted c++11 via this option and if someone
decides to upgrade it can be done explicitly.
The default can be whatever version is current i.e. c++14, c++17 in
couple of months and so on, but if you specify exact version you want
that exact version. If you want version X or above you specify the min
version.
I'm just saying this setting should follow the least surprising route.
AFAIK all of the supported compilers either provide some sort of
control over this or fall below c++11 (e.g. VS2013). If you specify an
exact number that's what you're expecting and CONFIG should provide
exactly that or as close as the underlying compiler actually supports.