GFortran 10 Argument Mismatch

[ax3l]

Just as in ADIOS2: ornladios/ADIOS2#2228

@michaelkuhn reported an issue in Spack, which indicated that ADIOS needs the Fortran compiler flag -fallow-argument-mismatch flag in order to build with GCC/GFortran 10.

Note:

Using this option is strongly discouraged. It is possible to provide standard-conforming code which allows different types of arguments by using an explicit interface and TYPE(*). 

https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html

Describe the bug
Please see spack/spack#16569

To Reproduce
s. above

Desktop (please complete the following information):

• OS/Platform: Ubuntu
• Build: GCC 10
• ADIOS version: 1.13.1

Additional context
See: spack/spack#16569

[NAThompson]

Yeah, I just hit this as well; I couldn't figure out a robust fix. My workaround was just

FCFLAGS="-g -O2 -fallow-argument-mismatch" ./configure

which I suppose is fairly obvious to anyone who works with configure scripts with any regularity. (Not me!)

[ax3l]

Yes, We were wondering if there is an actual change that we can implement in the code to address the raised diagnostics instead of muting it.