[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  |
----------------------+--------------------

Comment (by kencu):

 `binutils` is quite well known to cause build issues:
 {{{
 $ port notes binutils
 binutils has the following notes:
   Having binutils installed will cause some other ports to fail to build.
   Consider uninstalling binutils.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57356#comment:5>
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