Compiler flag -nomixed_str_len_arg deprecated in Intel 2021

[emkemp]

Bug Description

Currently the LISF build system sets the flag -nomixed_str_len_arg when compiling with Intel Fortran. On Narwhal (using Intel oneapi_2021.3.0.3219), this generates a warning about deprecation:

ifort: command line warning #10434: option '-nomixed_str_len_arg' use with underscore is deprecated; use '-nomixed-str-len-arg' instead

This is not a problem yet but will be soon. An adjustment to the build system is warranted.

Steps to Replicate

Easily replicated on Narwhal. Load Jim Geiger's private module "lisf_74_prgenv_intel_8.1.0". Then compile LDT off of the support/lisf-557ww-7.4 branch. (Can also use the master branch.) Frequent warning messages will appear in the standard output.

[jvgeiger]

Yes, I agree. I must first determine which versions of the Intel compilers our partners are using. I do not want to accidentally break compilation for "older" Intel compilers.

[emkemp]

This is still a TODO.