Too many compilers needed for C++11

[db]

On 7 Dec 2017, at 12:59, Mojca Miklavec <mojca at macports.org> wrote:
> Nowadays many ports claim
>    Warning: All compilers are either blacklisted or unavailable; defaulting to first fallback option
> but do install nevertheless at the end. I would say that this is a bug in either the portfiles or portgroups that's worth fixing anyway, but I just wanted to say that if you make this an error, suddenly a huge number of ports that can easily be built will simply stop working.
> 
> One of annoying things is that I'm getting this warning when I run "port livecheck maintainer:..." and I have absolutely no clue where it comes from.

When I temporarily switched to clang 3.9 in macports.conf with

default_compilers  macports-clang-3.9

that warning showed for every installation

$ sudo port install highlight
Warning: All compilers are either blacklisted or unavailable; defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable; defaulting to first fallback option
--->  Computing dependencies for highlight
...

and the following line was added on each `port info`, even to those ports that don't need it

Build Dependencies:   clang-3.9