Unrecognised compiler commands in a compiler config file ran using the mpiifort command

Question

Hi I'm trying to compile and run a .f90 code using the intel fortran compiler (ifx) and the intel mpi library on a linux HPC.

I'm invoking the compiler through a .sh script with the following lines:

I_MPI_COMPILER_CONFIG_DIR=/mnt/gpfs01/home/ws/wsjt10/3dmpi mpiifort Flowsolver.f90 -o -fc=ifx -config="ifx" Flowsolver
mpirun -np 10 ./Flowsolver 

Setting the config enviroment variable to a folder with a .conf file containing the compiler commands:

-O0
-init-zero
-init-arrays
-r8

In my output file I recieve the outputs:

/mnt/gpfs01/home/ws/wsjt10/3dmpi/mpif90-ifx.conf: line 1: -O0: command not found
/mnt/gpfs01/home/ws/wsjt10/3dmpi/mpif90-ifx.conf: line 2: -init-zero: command not found
/mnt/gpfs01/home/ws/wsjt10/3dmpi/mpif90-ifx.conf: line 3: -init-arrays: command not found
/mnt/gpfs01/home/ws/wsjt10/3dmpi/mpif90-ifx.conf: line 4: -r8: command not found

To my knowledge these are valid compiler commands (and I can for example compile a non MPI IFX code with these commands without issue) so I assume the format of the .conf file is incorrect in some way but to be honest I've had no luck trial and erroring it.

Does anyone more experienced with the MPI compiler wrappers know how I would specify compiler commands when running things through the MPI commands.

I have tried both

I_MPI_COMPILER_CONFIG_DIR=/mnt/gpfs01/home/ws/wsjt10/3dmpi mpiifort Flowsolver.f90 -o -fc=ifx -config="ifx" Flowsolver

and

export I_MPI_COMPILER_CONFIG_DIR=/mnt/gpfs01/home/ws/wsjt10/3dmpi
mpiifort Flowsolver.f90 -o -fc=ifx -config="ifx" Flowsolver

In my .sh script (these both do exactly the same thing and both get the same result, ie. command not found errors in the output file).

I've tried the windows format of the compiler options in the .conf file and obviously thats not worked.

There is almost no documentation that explains what I should be doing here.

I am convinced I'm doing something really stupid here so I do apologise if my amateurism shows.