[MacPorts] #59727: gcc9: fails to link properly (-lSystem no found)

[MacPorts]

#59727: gcc9: fails to link properly (-lSystem no found)
------------------------+--------------------
  Reporter:  akimd      |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.2
Resolution:             |   Keywords:
      Port:  gcc8 gcc9  |
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Comment (by kencu):

 try building your test program while sending a verbose output request to
 the linker; I think you'll find the linker is looking somewhere other than
 where it should be looking for the link libraries.

 For example:
 {{{
 gcc-mp-7 -Wl,-v foo.c
 }}}

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Ticket URL: <https://trac.macports.org/ticket/59727#comment:1>
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