[Development] Removing the -c++11 option from configure

[Oswald Buddenhagen]

On Tue, Mar 24, 2015 at 11:55:32AM -0700, Thiago Macieira wrote:
> On Tuesday 24 March 2015 19:49:41 Oswald Buddenhagen wrote:
> > > The support is already enabled by default and we'd like to now enable
> > > C++14  too, but I'd like not to add complexity to the configuration by
> > > adding a c++14/no-c++14 option.
> > 
> > that's how many, five lines of code?
> 
> More. That's at least a dozen in the configure script, since we need to ensure 
> someone didn't pass the impossible combination -c++14 -no-c++11.
> 
> Then there's the configure.exe source.
> 
> And then there's C++1z, plus possibly enabling Concepts Lite TS.
> 
right. as somebody already noted, a proper "language version" argument
would be in order. -stdc=..., in fact ...
and -gnu would be another "dimension".

but for the time being, keeping the current pattern doesn't sound like a
terrible effort. we spend more time discussing it than if you'd just
implement it.

> And all for what? What do people gain by passing -no-c++11 today?
> 
they can (at least hypothetically) test their stuff with older language
versions without installing a second compiler (and forcing qt to use it,
which is a royal pita).