[FFmpeg-trac] #6017(undetermined:new): --disable-everything keeps nvidia stuff enabled

[FFmpeg]

#6017: --disable-everything keeps nvidia stuff enabled
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             Reporter:  kierank      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Gyan):

 `--disable-autodetect` is blunt, and is, IMHO, the wrong tack.

 The test for an external lib should be whether there's at least one
 enabled component making use of the lib, and if not, that lib shouldn't be
 linked e.g.,

 `--disable-everything --enable-libx264` should fail since lavc/libx264.c
 isn't enabled and libx264 is expressly specified.

 `--disable-everything --enable-encoder=png` should be successful and link
 (autodetected) zlib but not cuda..etc.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6017#comment:3>
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