Re: C++20 and gcc12/10

[nia <nia%NetBSD.org@localhost>]

On Sun, Apr 06, 2025 at 10:56:30PM +0100, Jonathan Perkin wrote:
> * On 2025-04-06 at 21:25 BST, Greg Troxel wrote:
> 
> > But this is catering to one version that you just said you didn't want
> > to do.   To me, these features  make sense when someone needs c++nn and
> > then a feature which is beyond NN.   To say you need NN and have that
> > mean "except for the parts that somehow have separate words" is
> > unreasonable.
> 
> I don't understand what this means, and I don't think you understand what I
> mean, and people keep taking this thread in different tangents, so I'm just
> going to stop here as I don't want to be unreasonable.

I also don't understand this, because it's not really how compilers work.

Putting a compiler into a mode where it claims compliance with
a specific language version (i.e. accepting -std=XX as a command line
argument) is always the baseline feature other features are later built
upon.

It would be extremely messy to specify
USE_CXX_FEATURES+=	c++11 c++14stdmode specific_c++14_feature
to get some software to build.