[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 trac at avcodec.org
Sat Mar 3 13:36:04 EET 2018


#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            |
-------------------------------------+-------------------------------------

Comment (by ernsteiswuerfel):

 I did expect {{{--disable-runtime-cpudetec}}} to do what the config
 options tell, which is to create a smaller binary. Probably that's what
 Gentoo thinks too. ;)

 I don't think it's necessary to change configure to deal with custom
 compilations flags, as altivec is not among the default flags in Gentoo
 ppc/ppc64. If you build ffmpeg-3.4.2 without altivec it does just fine
 (even with gcc-7.3.0).

 I will look into the Gentoo bugs as you suggested and report back in a few
 days.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7048#comment:6>
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