A.1 Format flags required by some compilers

FHI-aims contains source code files in different formats (.f or .f90), and sometimes containing rather long lines in the .f90 versions.

The Makefile therefore contains two different versions of the compiler flags, FFLAGS and F90FLAGS, which can be the same for some compilers, but do not have to be the same.

For specific compilers, flags that must be added to account for the diffent file formats properly are:

• •

  xlf90 compiler (IBM): FFLAGS must contain the option “-qfixed” in addition to all other options specified with the F90FLAGS.

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  g95 compiler: F90FLAGS should contain the option -ffree-line-length-none in addition to all other options found in FFLAGS.