Compilation error due to MPI_Waitall

[adimanuwal]

Firstly, thanks for producing this code. I encountered the following errors while compiling. How can this be fixed?

engine_strays.c: In function ‘engine_exchange_strays’:
engine_strays.c:275:7: error: ‘MPI_Waitall’ accessing 20 bytes in a region of size 0 [-Werror=stringop-overflow=]
275 | if (MPI_Waitall(e->nr_proxies, reqs_out, MPI_STATUSES_IGNORE) != MPI_SUCCESS)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
engine_strays.c:275:7: note: referencing argument 3 of type ‘MPI_Status *’
In file included from /usr/include/x86_64-linux-gnu/mpich/mpi.h:977,
from engine_strays.c:27:
/usr/include/x86_64-linux-gnu/mpich/mpi_proto.h:592:5: note: in a call to function ‘MPI_Waitall’
592 | int MPI_Waitall(int count, MPI_Request array_of_requests[], MPI_Status array_of_statuses[])
| ^~~~~~~~~~~
engine_strays.c:538:9: error: ‘MPI_Waitall’ accessing 20 bytes in a region of size 0 [-Werror=stringop-overflow=]
538 | if (MPI_Waitall(5 * e->nr_proxies, reqs_out, MPI_STATUSES_IGNORE) !=
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
engine_strays.c:538:9: note: referencing argument 3 of type ‘MPI_Status *’
In file included from /usr/include/x86_64-linux-gnu/mpich/mpi.h:977,
from engine_strays.c:27:
/usr/include/x86_64-linux-gnu/mpich/mpi_proto.h:592:5: note: in a call to function ‘MPI_Waitall’
592 | int MPI_Waitall(int count, MPI_Request array_of_requests[], MPI_Status array_of_statuses[])

[MatthieuSchaller]

Hi,

Yes, this is a known bug of mpich. See: https://github.com/pmodels/mpich/wiki/ABI-Change-Wishlist

You can bypass the issue by configuring SWIFT with --enable-compiler-warnings.

[adimanuwal]

That was helpful. Thanks!