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gccfortrangfortranopenacc

gFortran and OpenACC support

According to the gFortran docs in order to enable OpenACC support it is necessary to use the -fopenacc switch. However, this does not seem to work.

gfortran: error: unrecognized command line option ‘-fopenacc’

gFortran version is GNU Fortran (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28).

What is the correct way to compile Fortran code with OpenACC support?

Solution

  • Your version is WAY too old. The currently supported versions of GCC are 7, 8 and 9. The version specific manuals are available at https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gfortran/OpenACC.html#OpenACC Change the version number in the address to see other versions.

    The option appears to be added in version 5 but the support in more recent versions is likely to be much better.