[MacPorts] #65849: a error of dependency cycle of llvm.*, clang-* when installing gcc7

[MacPorts]

#65849: a error of dependency cycle of llvm.*, clang-* when installing gcc7
--------------------+--------------------
 Reporter:  jzuofm  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.7.2
 Keywords:          |       Port:
--------------------+--------------------
 Hello, when I tried to install gcc7 by MacPorts, it requires the
 dependences of llvm.*, clang-* and other stuffs. However, it showed up a
 error as

 {{{ Error: The following dependencies were not installed because all of
 them have unmet dependencies (likely due to a dependency cycle): ld64
 ld64-latest libtapi clang-14 clang-11 clang-9.0 llvm-11 llvm-14 libgcc9
 libgcc10 libgcc11 libgcc libgcc12 }}}

 How to solve this? I have upgraded the port to the newest 2.7.2 version
 and my OS is 10.12.6.

 Thanks

-- 
Ticket URL: <https://trac.macports.org/ticket/65849>
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