[MacPorts] #59246: ffmpeg @4.2.1_1 / x265 @3.2: compile fine but cannot be executed/crash immediately mac os 10.15 catalina / Xcode 11.1

[MacPorts]

#59246: ffmpeg @4.2.1_1 / x265 @3.2: compile fine but cannot be executed/crash
immediately mac os 10.15 catalina / Xcode 11.1
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  Reporter:  jonasjonas  |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.1
Resolution:              |   Keywords:  catalina
      Port:  ffmpeg      |
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Comment (by thenickdude):

 This bug is being tracked by ffmpeg too:

 https://trac.ffmpeg.org/ticket/8073

 Analysis by zwaldowski:

 "It seems the 10.15 toolchain turns on "-fstack-check" by default for
 Clang, like some Linux distributions do. [...] Accordingly, adding "-fno-
 stack-check" to "CFLAGS" - f.ex., by '--extra-cflags="-fno-stack-check"'
 when configuring works around the problem and builds a functioning
 FFMPEG."

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Ticket URL: <https://trac.macports.org/ticket/59246#comment:14>
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