[MacPorts] #53864: can't set "compiler.blacklist": couldn't determine build number of compiler "llvm-gcc-4.2"

[MacPorts]

#53864: can't set "compiler.blacklist": couldn't determine build number of compiler
"llvm-gcc-4.2"
-----------------------+-----------------
 Reporter:  MooersLab  |      Owner:
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:
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 I get the following error when upgrading {{{ Error: Unable to open port:
 can't set "compiler.blacklist": couldn't determine build number of
 compiler "llvm-gcc-4.2" }}}.
 I have the compiler in question installed.
 I have a current version of Xcode with command line tools.
 I downloaded and replaced the command line tools, but got no change in
 behavior.
 I tried {{{ sudo port -d sync}}} which reported {{{DEBUG: Copying /Users
 /blaine-mooers/Library/Preferences/com.apple.dt.Xcode.plist to
 /opt/local/var/macports/home/Library/Preferences}}}.
 I uninstalled gcc6.
 I then could not re-install gcc6.
 Instead, I got the first error message.
 Removal of gcc6 did not permit completion of the {{{ sudo port -d sync}}}
 command.
 I uninstalled the inactive ports.
 I uninstalled the the leaves.
 I ran selfupdate and upgrade outdated again.
 I get the first error message again.
 I have attached the output of {{{sudo port -d upgrade outdated}}}.

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Ticket URL: <https://trac.macports.org/ticket/53864>
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