[mythtv] DVB symbol errors with gcc 8.3

[Michael George]

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On Thu, Jul 25, 2019 at 1:24 AM Paul B. Henson <henson at acm.org> wrote:

> As described in:
>
>         https://bugs.gentoo.org/show_bug.cgi?id=683280
>
> Compiling mythtv with gcc 8.3 results in an error when DVB is not
> enabled:
>
>
> /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../x86_64-pc-linux-gnu/bin/ld:
> ../../libs/libmythtv/libmythtv-29.so: undefined reference to
> `DVBChannel::Open(DVBChannel*)
>
> It appears this is caused by the unconditional include of dvbchannel.h
> by mythtv/libs/libmythtv/channelscan/channelscanner.cpp, that include
> file defines the DVBChannel class, and for some reason with gcc 8.3 that
> now causes a symbol reference to some of the class methods. I'm not sure
> if that's a compiler bug, or just implementation dependent behavior.
>
> In any case, guarding that include with an "#ifdef USING_DVB" resolves
> the problem. Assuming this isn't a gcc bug (or even if it is, not
> defining the dvb classes when you're not using it seems a good idea
> regardless) could somebody commit a change like this or something
> equivilent?
>
> Thanks much...
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