Re: c++20: require gcc12?

[Martin Husemann <martin%duskware.de@localhost>]

On Tue, Feb 11, 2025 at 09:11:08AM -0500, Greg Troxel wrote:
> gcc10 takes c++20 but does not declare conformance.  gcc12 does.  (This
> argues even more strongly for fixing gcc.mk to require 12.)  Is this a
> bug in our gcc?  I would say it's an upstream issue -- but gcc says that
> you need 12 to be compliant with c++20, so not really a bug.

The gcc from pkgsrc does work: replacing g++ in your script with
/usr/pkg/gcc10/bin/g++ (on a netbsd-9 machine) results in:

STD 11:
__cplusplus 201103

STD 14:
__cplusplus 201402

STD 17:
__cplusplus 201703

STD 20:
__cplusplus 201709

STD 23:
g++: error: unrecognized command-line option '--std=c++23'; did you mean '--std=c++03'?
test.sh: ./foo23: not found

Martin