[MacPorts] #54797: clang: error: no such file or directory

[MacPorts]

#54797: clang: error: no such file or directory
-------------------------+--------------------
 Reporter:  conradwt     |      Owner:
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.4.99
 Keywords:  high sierra  |       Port:  go
-------------------------+--------------------
 When I attempt to install the go port, the following dependency fails to
 build because it appears that macOS High Sierra has changed the location
 of the Clang runtime:

 ```
 clang: error: no such file or directory: '/Applications/Xcode-
 beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/lib/darwin17.0.0/libclang_rt
 .builtins-x86_64.a'
 ```

 Furthermore, I wasn't able to locate `libclang_rt.builtins-x86_64.a`
 within the following path for Xcode 9 Beta on macOS High Sierra:

 ```
 /Applications/Xcode-
 beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/lib/darwin
 ```

--
Ticket URL: <https://trac.macports.org/ticket/54797>
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