rmtrash @0.3.3: error: unknown property attribute 'class'

[todd@…]

Several compile errors related to unknown property attribute 'class' in Foundation.framework/Headers. The following is the first of many:

  :info:build /usr/bin/clang -Os -arch x86_64 -framework Foundation -arch x86_64 rmtrash.m -o rmtrash
  :info:build In file included from rmtrash.m:1:
  :info:build In file included from /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10:
  :info:build In file included from /System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:5:
  :info:build /System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:44:12: error: unknown property attribute 'class'
  :info:build @property (class, readonly) BOOL supportsSecureCoding;
  :info:build            ^

Note that I'm running MacPorts compiled from source on the macOS Sierra Public Beta 1

[ryandesign (Ryan Carsten Schmidt)]

Works for me on Sierra public beta 1 with Xcode 8 beta 2. On Sierra, make sure you're using Xcode ≥ 8. Note that Sierra public beta 2 and Xcode 8 beta 3 are out now. Note that it's best not to discuss issues relating to pre-release versions of Apple products in public forums like this issue tracker.

[RJVB (René Bertin)]

Note that using clang-3.8 and clang-3.9 from MacPorts (versions current as of this post) will lead to the same errors.