[MacPorts] #52588: Mercurial 3.9.1 error: 'swift_name' attribute cannot be applied

[MacPorts]

#52588: Mercurial 3.9.1 error: 'swift_name' attribute cannot be applied
------------------------+--------------------------------
 Reporter:  rgacote@…   |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:  swift_name  |       Port:  mercurial
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 Upgraded two computers to Sierra.
 Upgraded both to macports 2.3.4.
 Xcode 8.0 installed on both.

 Trying to install mercurial (version 3.9.1).
 One computer installs without problems.
 Other fails with following error:

 building 'mercurial.osutil' extension
 /usr/bin/clang -fno-strict-aliasing -fno-common -dynamic -pipe -Os -fwrapv
 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes
 -I/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7
 -c mercurial/osutil.c -o
 build/temp.macosx-10.12-x86_64-2.7/mercurial/osutil.o
 In file included from mercurial/osutil.c:862:
 In file included from
 /System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:27:
 In file included from
 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framework/Headers/ATS.h:28:
 In file included from
 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framework/Headers/ATSLayoutTypes.h:28:
 In file included from
 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framework/Headers/ATSTypes.h:24:
 In file included from
 /System/Library/Frameworks/CoreGraphics.framework/Headers/CGGeometry.h:8:
 /System/Library/Frameworks/CoreGraphics.framework/Headers/CGBase.h:282:78:
 error: 'swift_name' attribute cannot be applied to this declaration
 typedef struct  CF_BRIDGED_TYPE(id) __IOSurface *IOSurfaceRef
 __attribute__((swift_name("IOSurfaceRef")));

 Tried multiple rebuilds and cleaning the partial builds.
 Any thoughts appreciated.
 --Ray

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Ticket URL: <https://trac.macports.org/ticket/52588>
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