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Compiler-flags.md

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Compiler flag Examples

Before using the Makefiles supplied with the RTE+RRTMGP repository, the environment variables FC and FCFLAGS, identifying the Fortran compiler and flags passed to it, need to be set. Here are some examples used during development and testing.

To build any of the executables in examples/ or tests the locations of the C and Fortran netCDF libraries need to be set via environment variables NCHOME and NFHOME, and the variable RRTMGP_ROOT must be set to the root of the RTE+RRTMGP installation.

Gnu Fortran

FC: gfortran-8 or gfortran-9 or gfortran-10

Debugging flags

FCFLAGS: "-ffree-line-length-none -m64 -std=f2008 -march=native -fbounds-check -finit-real=nan -DUSE_CBOOL"

Even stricter debugging flags

FCFLAGS: "-ffree-line-length-none -m64 -std=f2008 -march=native -fbounds-check -fbacktrace -finit-real=nan -DUSE_CBOOL -pedantic -g -Wall"

Intel Fortran

FC: ifort

Debugging flags

FCFLAGS: "-m64 -g -traceback -heap-arrays -assume realloc_lhs -extend-source 132 -check bounds,uninit,pointers,stack -stand f08"

Optimization flags:

FCFLAGS:"-m64 -O3 -g -traceback -heap-arrays -assume realloc_lhs -extend-source 132"

PGI Fortran

FC: pgfortran or FC: nvfortran (if using the Nvidia HPC SDK)

Debugging flags

FCFLAGS: "-g -Minfo -Mbounds -Mchkptr -Mstandard -Kieee -Mchkstk -Mallocatable=03 -Mpreprocess"

Optimization flags:

FCFLAGS: "-m64 -O3 -g -traceback -heap-arrays -assume realloc_lhs -extend-source 132"