utilities: add stubs for CO_BROADCAST() as defined in Fortran 2018

gutmann / coarray_icar

Testing implementation of CoArrays for the basic ICAR algorithms

MIT License

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utilities: add stubs for CO_BROADCAST() as defined in Fortran 2018 #32

Closed bcfriesen closed 6 years ago

bcfriesen commented 6 years ago

Currently only the Cray compiler supports CO_BROADCAST(), but it is hugely faster than the custom CO_BCAST() implemented in this code. Until more compilers implement CO_BROADCAST(), keep it isolated in its own utility file which is compiled only if F18=TRUE is set in the makefile.