Enabling OpenACC (GNU libgomp)

## 5 Enabling OpenACC ¶

To activate the OpenACC extensions for C/C++ and Fortran, the compile-time flag `-fopenacc` must be specified. This enables the OpenACC directive ‘`#pragma acc`’ in C/C++ and, in Fortran, the ‘`!$acc`’ sentinel in free source form and the ‘`c$acc`’, ‘`*$acc`’ and ‘`!$acc`’ sentinels in fixed source form. The flag also arranges for automatic linking of the OpenACC runtime library (OpenACC Runtime Library Routines).

See https://gcc.gnu.org/wiki/OpenACC for more information.

A complete description of all OpenACC directives accepted may be found in the OpenACC Application Programming Interface manual, version 2.6.