[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
 Keywords:  mpich, gcc7  |       Port:  mpich-gcc7
-------------------------+------------------------
 I installed gcc7 @7.3.0_0 (active) and mpich-gcc7 @3.2.1_3+fortran
 (active) on my Mac. When I tried to compile an MPI program, an error was
 returned:

 {{{
 /opt/local/include/mpich-gcc7/mpicxx.h:22:4: error: #error 'Please use the
 same version of GCC and g++ for compiling MPICH and user MPI programs'
  #  error 'Please use the same version of GCC and g++ for compiling MPICH
 and user MPI programs'
 }}}

 So I took a look in mpicxx.h, and found

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

 It looks like a version mismatch of gcc 7.3 with the packaged mpich-gcc7.

--
Ticket URL: <https://trac.macports.org/ticket/55917>
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