[mpich-discuss] Fortran 2008 MPI Interface Bug

Zhang, Junchao jczhang at mcs.anl.gov
Fri Nov 22 16:15:25 CST 2019

  If you can build MPICH with gfortran (which is easy in my opinion), then you can easily do the experiment. Attaching a debugger, within a few steps, you run into gfortran code. Watching the address where the array's start index is stored, you can immediately find the bug. Otherwise, Hui has to separate out the few C/Fortran wrappers and make them MPI independent to make a test code.

--Junchao Zhang

On Thu, Nov 21, 2019 at 11:17 AM Zhou, Hui <zhouh at anl.gov<mailto:zhouh at anl.gov>> wrote:
Hi Thomas,

Just to follow up. I will try to isolate a reproducing example at some point (unless someone beats me).

Hui Zhou

On Nov 15, 2019, at 12:48 PM, Thomas König via discuss <discuss at mpich.org<mailto:discuss at mpich.org>> wrote:

Hi Junchao,

Could you check if it is a gcc bug in handling type(*), dimension(..)

Unfortunately, I don't know the code that well to be able to do it.

If you could put together a simple, self-contained test case showing i
there is a problem, you could submit that to gcc's bugzilla (or I could
do that for you).

I could also check a simplified test case against current gfortran
trunk, which will not compile mpich 3.3.1 because it now flags argument
mismatches as errors.

(And yes, argument mismatches are real errors, which cause wrong
code; see for example https://bugs.debian.org/944127 .)

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