[MacPorts] #57356: libgcc8 @8.2.0.1 fails to build on Mojave with "C compiler cannot create executables"

[MacPorts]

#57356: libgcc8 @8.2.0.1 fails to build on Mojave with "C compiler cannot create
executables"
----------------------+--------------------
  Reporter:  p-vitt   |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.5.4
Resolution:           |   Keywords:  mojave
      Port:  libgcc8  |
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Comment (by MarcusCalhoun-Lopez):

 It is important to see the main.log file.\\
 You could always try compressing it before uploading.

 However, just looking at the config.log, the presence of
 {{{/opt/local/bin/gnm}}} seems a little strange.\\
 I do not have that installed on my system.\\
 What is the result of {{{port provides /opt/local/bin/gnm}}}?\\
 Just as a first step, you might want to deactivate whatever port is
 providing {{{gnm}}}, clean {{{libgcc8}}}, and try installing {{{libgcc8}}}
 again.

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Ticket URL: <https://trac.macports.org/ticket/57356#comment:3>
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