On Sat, 22 Aug 2020 14:05:27 -0000 (UTC)
Christian Weisgerber <na...@mips.inka.de> wrote:

> I'm currently receiving pkg-fallout mail that some of the ports I
> maintain are failing to build with "duplicate symbol" errors.
> 
> It is unclear to me whether these are actual problems I need to
> take care of, or just some kind of screw-up on the package build
> server.  This part of each message doesn't inspire confidence:
> 
> !!! Jail is newer than host. (Jail: 1300110, Host: 1300100) !!!
> !!! This is not supported. !!!
> !!! Host kernel must be same or newer than jail. !!!
> !!! Expect build failures. !!!
> 
> Can somebody clarify what's going on?
> 

I've had some of these. I know that at least some of them are because
CLANG 11 defaults to -no-fcommon (previous was -fcommon).

Basically, a symbol defined (but not extern) in more than one module
will cause this.
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