[FFmpeg-trac] #7861(swscale:new): altivec compilation broken on specific setups starting with gcc 8.3

[FFmpeg]

#7861: altivec compilation broken on specific setups starting with gcc 8.3
-------------------------------------+-----------------------------------
             Reporter:  q66          |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:  ppc altivec  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-----------------------------------

Comment (by cehoyos):

 Compilation with gcc-8.3.1 for little-endian POWER8 works fine here,
 please explain how I can reproduce the issue.
 {{{
 $ ffmpeg
 ffmpeg version N-94484-gaf3ddd5 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 8.3.1 (GCC) 20190304 (Advance-Toolchain-at12.0) [revision
 269374]
   configuration: --cpu=power8 --enable-gpl --cc=/opt/at12.0/bin/gcc
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Hyper fast Audio and Video encoder
 usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]
 outfile}...

 Use -h to get full help or, even better, run 'man ffmpeg'
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7861#comment:9>
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