mpv-0.31 fails to build on Catalina -- failed to import bridging header

[Liontooth (David Liontooth)]

$ sudo port install mpv
--->  Computing dependencies for mpv
--->  Fetching archive for mpv
--->  Attempting to fetch mpv-0.31.0_0+audiocd+bundle+dvd+libarchive+network+opengl+osd+python27+rubberband.darwin_19.x86_64.tbz2 from https://packages.macports.org/mpv
--->  Attempting to fetch mpv-0.31.0_0+audiocd+bundle+dvd+libarchive+network+opengl+osd+python27+rubberband.darwin_19.x86_64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/mpv
--->  Attempting to fetch mpv-0.31.0_0+audiocd+bundle+dvd+libarchive+network+opengl+osd+python27+rubberband.darwin_19.x86_64.tbz2 from http://aus.us.packages.macports.org/macports/packages/mpv
--->  Fetching distfiles for mpv
--->  Verifying checksums for mpv
--->  Extracting mpv
--->  Configuring mpv
--->  Building mpv
Error: Failed to build mpv: command execution failed

:info:build <unknown>:0: error: failed to import bridging header '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_mpv/mpv/work/mpv-player-mpv-569a0a3/osdep/macOS_swift_bridge.h'

[Liontooth (David Liontooth)]

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_mpv/mpv/main.log

[i0ntempest]

WIP PR: ​https://github.com/macports/macports-ports/pull/7080

[kencu (Ken)]

modules are a new feature and we are seeing issues with them.

my guess is it might build if the SDK used was the original Xcode SDK.

[i0ntempest]

Thanks, adding use_xcode yes finally fixed the build. Should this be applied globally? If not the PR is ready for review.

[kencu (Ken)]

Well -- anywhere that modules are enabled. It's probably an Xcode test, I guess, rather than an os.version test we will need -- I'm sorry, off the top of my head, I'm not 100% certain which Xcode started supporting modules. I think we just have to do some trial and error unless someone can find the tiny little page on the internet that tells us...

[i0ntempest]

Okay, I'd say maybe apply the fix for Xcode 11+ and macOS 10.15+ for now and tweak the condition later if error occurs somewhere else.

[i0ntempest]

In 04fe8bb863e5435df07406093582808f48d49f0a/macports-ports (master):

mpv: update to 0.32.0

use python 3.8
catalina build fix

Closes: #60267