[MacPorts] #46063: libgcc upgrade to 4.9.2_1 fails

[MacPorts]

#46063: libgcc upgrade to 4.9.2_1 fails
----------------------+----------------------
  Reporter:  dersh@…  |      Owner:  larryv@…
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.3.3
Resolution:           |   Keywords:
      Port:  libgcc   |
----------------------+----------------------

Comment (by larryv@…):

 The log contains many variations on this, as seen previously in #41095,
 #41643, #42076, #43282, and #43444:
 {{{
 :info:build clang: error: couldn't create cache file
 '/var/folders/4p/9fzq5t3s11sbl2g7mgjvzh280000gr/T/xcrun_db-3DK8BVlg'
 (errno=Permission denied)
 }}}
 Try deleting that directory and upgrading again.
 {{{
 % sudo rm -fR /var/folders/4p
 % sudo port clean libgcc
 % sudo port upgrade libgcc
 }}}

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Ticket URL: <https://trac.macports.org/ticket/46063#comment:4>
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