[MacPorts] #65337: openmpi @4.1.4: subports openmpi-gcc7 and openmpi-gcc9: builds failing for 10.7 and earlier

[MacPorts]

#65337: openmpi @4.1.4: subports openmpi-gcc7 and openmpi-gcc9: builds failing for
10.7 and earlier
----------------------------------------+----------------------
  Reporter:  mascguy                    |      Owner:  mascguy
      Type:  defect                     |     Status:  assigned
  Priority:  Normal                     |  Milestone:
 Component:  ports                      |    Version:  2.7.2
Resolution:                             |   Keywords:
      Port:  openmpi-gcc7 openmpi-gcc9  |
----------------------------------------+----------------------

Comment (by mascguy):

 Reviewing `config.log`, it looks like the following is occurring:

 {{{
 configure:6591: checking whether the C compiler works
 configure:6613: /opt/local/bin/gcc-mp-7 -pipe -Os
 -I/opt/local/include/LegacySupport -arch x86_64 -I/opt/local/include/L
 egacySupport -Wl,-headerpad_max_install_names -lMacportsLegacySupport
 conftest.c  >&5
 ld: library not found for -lgcc_ext.10.5
 collect2: error: ld returned 1 exit status
 }}}

 This appears to be the same problem covered by issue:65055, so need to do
 more digging.

-- 
Ticket URL: <https://trac.macports.org/ticket/65337#comment:1>
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