[Mvapich-discuss] MVAPICH2 2.3.7, Fedora Core 35 x86_64, and gcc (GCC) 12.0.1 (experimental): user bogus warnings

[Jorge D'Elia]

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Dear all,

Last March I built the distro: 

MVAPICH2 2.3.7 Wed March 02 22:00:00 EST 2022 ch3:mrail

on an AMD machine (Ryzen 7 3700X 2.2GHz 8-core 32MB) with 
Fedora 35/x86_64 (via a subsequent upgrade from Fedora 34). 

All it was fine. Nevertheless, with a fortran source 
code that has the lines:

  use mpi
  ...
  call mpi_gather (...)

and compiled with the (extra) gfortran flags:
  
-Wimplicit-interface (or with -Wimplicit-procedure)

there is a warning message:

Warning: Procedure ‘mpi_gather’ called with an implicit interface at (1) [-Wimplicit-interface]
Warning: Procedure ‘mpi_gather’ called at (1) is not explicitly declared [-Wimplicit-procedure]

These messages are somewhat bogus (moreover, do not occur, say, with openmpi). 
Perhaps, it could be improved?

 
Regards
Jorge.
--
#begin
Build and Installation
    MVAPICH2 version:
       MVAPICH2 2.3.7 Wed March 02 22:00:00 EST 2022 ch3:mrail
    Compiler version
       gcc --version
       gcc (GCC) 12.0.1 20220125 (experimental)
    Platform details (OS, kernel version..etc)
       Fedora Core 35 x86_64
       kernel-core-5.17.6-200.fc35.x86_64
    Configure flags
       ../configure --with-rdma=gen2 --enable-fortran=all --enable-romio
       --enable-fast=all --enable-mpit-pvars=all --prefix=/usr/beta/mvapich2
    System information
       OS version (/etc/issue)
       Kernel version (uname -a)
         Linux 5.17.6-200.fc35.x86_64 
         #1 SMP PREEMPT Mon May 9 14:22:05 UTC 2022 
         x86_64 x86_64 x86_64 GNU/Linux
         OFED info (ofed_info)
         none
         IB card info (ibv_devinfo)
         No IB devices found
#end