On most platforms at CERN the recommended Fortran compiler is called f77. The exception is HP/UX where you are recommended to use fort77 rather than f77 since it allows you to specify libraries in a way which is compatible with all the other platforms. For AIX on the RS/6000 the Fortran compiler is called xlf, but in more recent versions of AIX the name f77 can also be used. On DEC Ultrix systems the supported compiler is the DEC Fortran compiler rather than the MIPS Fortran.
The table below shows the minimum command that should be used for compiling and linking in the CERN environment.
As we saw in the section above, by default Unix compilers generate an executable module. The option `` -c'' (compile only) generates an object file but causes the linking phase to be surpressed.
The options -qextname on AIX and +ppu on HP/UX are explained in
section 
and are ESSENTIAL for compatibility with the CERN Program
Library.