Re: c++11

[Taylor R Campbell <campbell+netbsd-tech-pkg%mumble.net@localhost>]

   Date: Sat, 5 Nov 2016 00:20:18 +0100
   From: Thomas Klausner <wiz%NetBSD.org@localhost>
   
   On Fri, Nov 04, 2016 at 07:43:43PM +0100, Joerg Sonnenberger wrote:
   > The real problem is that it doesn't solve the problem of mixing runtime
   > libraries. In the GCC of GCC 5.1+, you even end up with broken ABI
   > differences when using -std=c++11 vs not.
   
   Do you have a suggestion how to handle this then?

Sounds like the problem is if two libraries use c++11, and one of them
is happy with GCC 4.9 but the other needs GCC 5.1, pkgsrc will build
the first with GCC 4.9 and the second with GCC 5.1 and then they will
fail to work together in the same address space.

Is that right?  If so, it sounds like having logic, as we do now, that
works per-package to choose a C++ compiler is no good, and instead we
need to choose a C++ compiler for an entire set of packages at once to
satisfy them all.