[MacPorts] #58895: gcc9: search path for standard libraries is incomplete/incorrect

[MacPorts]

#58895: gcc9: search path for standard libraries is incomplete/incorrect
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  Reporter:  prbuen  |      Owner:  (none)
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  gcc9    |
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Comment (by prbuen):

 My bash profile exports `LD_LIBRARY_PATH` and `LIBRARY_PATH` to
 `/usr/lib:/usr/local/lib`. I also tried to set up `DYLD_LIBRARY_PATH` to
 `/usr/lib`, and `LDFLAG` to `-L/usr/lib` but none of these seem to affect
 how `gcc-mp-9` calls the linker.

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Ticket URL: <https://trac.macports.org/ticket/58895#comment:16>
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