[FFmpeg-trac] #7048(build system:reopened): building 3.4.2 with gcc 7.3.0 with altivec support enabled fails on ppc (Gentoo Linux)

[FFmpeg]

#7048: building 3.4.2 with gcc 7.3.0 with altivec support enabled fails on ppc
(Gentoo Linux)
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  ernsteiswuerfel                    |                   Status:  reopened
                 Type:  defect       |                Component:  build
             Priority:  normal       |  system
              Version:  unspecified  |               Resolution:
             Keywords:  gcc altivec  |               Blocked By:
  ppc                                |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * status:  closed => reopened
 * resolution:  fixed =>


Comment:

 Unrelated: {{{--disable-runtime-cpudetect}}} does not do what you/Gentoo
 expect, you cannot disable the call to the cpu detection function.

 I assume this is the the same issue as Gentoo bugs 578802 and 645778:
 Perhaps you can find out if completely removing {{{--optflags}}} from the
 build has a disadvantage (after confirming this is also your issue)?

 I wonder if it would be an advantage for you if configure would detect the
 broken custom compilation flags and disable !AltiVec...

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Ticket URL: <https://trac.ffmpeg.org/ticket/7048#comment:5>
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