4.7) GNU: Loading And Using The Compiler

As mentioned before the Intel compilers are loaded by default on ARC2, to switch to the GNU compilers use the module command, e.g.:

$ module switch intel gnu/4.8.1

This will add the specified GNU compilers to your environment.

Basic compilation follows in an identical way to the Intel compilers, using gfortran and g77 for Fortran 90/77, gcc for C and g++ for C++.

E.g. for Fortran 90

$ gfortran –o hello hello.f90

As with the Intel compilers, various levels of optimisation are available through the –O0, -O1, -O2 and -O3 flags. The default is –O0, no optimisation. See man pages for compiler options and their description.