mpi needs an update for octave 6.x

[matzeri]

It seems mpi needs an update for octave 6.x

On Cygwin with 6.4 I see:

MPI_Iprobe.cc:68:17: warning: ‘error_state’ is deprecated: [6]: this variable is obsolete and always has the value 0 [-Wdeprecated-declarations]
   68 |           if (! error_state)
      |                 ^~~~~~~~~~~

[carlodefalco]

Thanks for the report. If I understand correctly that Is just a warning that can be ignored. In Octave 6, if an errore occurs an exception will be thrown causing the function to return so that the if statement Is not even reached. If the if statement is reached It means no error occurred so it Is correct that error_state is assumed to be false. Keeping the code this way maximizes backward compatibility I think, so it should be changed only when error_state is removed ... c.

[carlodefalco]

Just starting to experiment with Octave 7.1 ...
If I understand correctly, it appears that now error_state has been removed, so it is indeed time to address this issue.
This will break compatibility with Octave 5, but I think it is OK