Hi,

10.15 issues are worked around in

https://github.com/macports/macports-ports/commit/36c3a9a2844ab979be1388280922b25d1f7b56ce
 
<https://github.com/macports/macports-ports/commit/36c3a9a2844ab979be1388280922b25d1f7b56ce>

https://github.com/macports/macports-ports/commit/2de6959b098cb95883863a2cf46575dfcf4c211c
 
<https://github.com/macports/macports-ports/commit/2de6959b098cb95883863a2cf46575dfcf4c211c>

They blacklist Xcode 11 clang, and thus the builds fallback to one of MacPorts 
MP’s clang compilers (9.0). 

Running Xcode 10 on macOS10.15 is unnecessary, and not really a good idea.

For ‘Part B’ difficult to say as long as Xcode has issues (which I understand 
as off 11.1 it does). Until those are addressed hard to say if the project 
themselves also have issues to address.

Chris

> On 17 Oct 2019, at 9:58 pm, Gill Bates <[email protected]> wrote:
> 
> I recently updated to catalina (10.15) and Xcode (11.1), installed MacPorts 
> from source (2.6.1) and had it build mpv and its dependencies. However, mpv 
> (and ffmpeg for example) do not run apparently related to some new default 
> compiler option enforcing 16 byte stack alignment? See:
> https://trac.ffmpeg.org/ticket/8073 <https://trac.ffmpeg.org/ticket/8073>
> https://github.com/mpv-player/mpv/issues/7053 
> <https://github.com/mpv-player/mpv/issues/7053>
> https://forums.developer.apple.com/thread/121887 
> <https://forums.developer.apple.com/thread/121887>
> 
> The advice seems to be to revert Xcode but will rebuilding everything with 
> Xcode 10.3 on macos 10.15 really be a workaround? Or is a better choice to 
> modify portfiles to include the CFLAG option to disable stack checks as 
> mentioned in the linked posts and use Xcode 11.1?
> 
> "Part B" is a question for my understanding, is this a really an 
> Xcode/compiler issue or a problem with the source software packages?
> 
> Thanks in advance for any advice.

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