[MacPorts] #55917: mpich-gcc7 complains about g++ version mismatch

[MacPorts]

#55917: mpich-gcc7 complains about g++ version mismatch
--------------------------+-------------------------
  Reporter:  astroboylrx  |      Owner:
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.2
Resolution:               |   Keywords:  mpich, gcc7
      Port:  mpich-gcc7   |
--------------------------+-------------------------

Comment (by astroboylrx):

 I built mpich-3.2.1 from source with gcc 7.3, which prevents the error. I
 noticed the relevant code in mpicxx.h becomes

 {{{
       15 // Check for incompatible GCC versions
       16 // GCC (specifically) g++ changed the calling convention
       17 // between 3.2.3 and 3.4.3 (!!)  Normally such changes
       18 // should only occur at major releases (e.g., version 3 to 4)
       19 #ifdef __GNUC__
       20 # if __GNUC__ >= 7
       21 #  if __GNUC_MINOR__ > 2 && 3 == 2
       22 #  error 'Please use the same version of GCC and g++ for
 compiling MPICH and user MPI programs'
       23 #  endif
       24 # endif
       25 #endif
 }}}

 Hope this helps a little bit.

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Ticket URL: <https://trac.macports.org/ticket/55917#comment:1>
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