Supported Compilers

Selecting a compiler

Use the -compiler flag (case-insensitive):

FoBiS.py build -compiler gnu
FoBiS.py build -compiler intel
FoBiS.py build -compiler custom -fc g95 -modsw "-fmod="

Or set it in the fobos file:

[default]
compiler = gnu

Built-in compilers

Identifier	Compiler
gnu	GNU gfortran
intel	Intel Fortran Compiler Classic (ifort)
intel_nextgen	Intel Fortran Compiler (ifx)
g95	g95
opencoarrays-gnu	OpenCoarrays + gfortran
pgi	PGI Fortran Compiler
ibm	IBM XL Fortran
nag	NAG Fortran Compiler
nvfortran	NVIDIA HPC Fortran (nvfortran)
amd	AMD Flang (amdflang)
custom	User-defined — requires -fc and optionally -modsw

Custom compiler

For any compiler not listed, use custom and specify the executable and module path switch:

FoBiS.py build -compiler custom -fc /opt/myfc/bin/myfc -modsw "-module "

In a fobos file:

[default]
compiler = custom
fc       = /opt/myfc/bin/myfc
modsw    = -module
cflags   = -c -O2

Compiler variants

MPI

Enable the MPI-wrapped compiler variant:

FoBiS.py build -mpi

This switches to the MPI wrapper (e.g. mpif90 for GNU, mpiifort for Intel).

OpenMP

FoBiS.py build -openmp

Adds the appropriate OpenMP flag for the selected compiler.

OpenMP offloading

FoBiS.py build -openmp_offload

Coarrays

FoBiS.py build -coarray

Coverage instrumentation

Instrument the build for gcov-compatible coverage analysis:

FoBiS.py build -coverage

After running the program, analyze .gcov files with the intrinsic rule:

FoBiS.py rule -gcov_analyzer reports/ summary

Profiling

FoBiS.py build -profile

Compilation and linking flags

Override the default flags for the selected compiler:

FoBiS.py build -cflags " -c -O3 -march=native" -lflags " -O3"

Or in fobos:

[default]
cflags = -c -O3 -march=native
lflags = -O3

Flag prefixing

Prepend a space to flag strings to avoid argparse misinterpreting flags that start with -. See the Quick Start note.

Preprocessor flags

Pass flags to the compiler's built-in preprocessor (e.g. -D macros):

FoBiS.py build -p " -DDEBUG -DUSE_MPI"

In fobos:

[default]
preproc = -DDEBUG -DUSE_MPI