pkg-fallout: duplicate symbols?

[Dimitry Andric]

On 22 Aug 2020, at 16:05, Christian Weisgerber <naddy at 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.

See <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248756>.

This is because clang 11 defaults to -fno-common now, causing some
programs that incorrectly define multiple copies of the same global
variables to no longer link.

It can be worked around by adding -fcommon to the compilation flags, but
in most cases it should not be too difficult to get rid of the multiply
defined symbols.


> 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. !!!

Yeah, this warning is seen all the time, and while it sounds very
ominous, there is not much you can do about it.

-Dimitry

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