User's Guide

Source-Code Conformance Checking

To help you find anything in your programs that might cause problems when you port to or from different FORTRAN 77, Fortran 90, or Fortran 95 compilers, the XL Fortran compiler provides options that warn you about features that do not conform to certain Fortran definitions.

If you specify the appropriate compiler options, the XL Fortran compiler checks source statements for conformance to the following Fortran language definitions:

• Full American National Standard FORTRAN 77 (-qlanglvl=77std option), full American National Standard Fortran 90 (-qlanglvl=90std option), and full Fortran 95 standard (-qlanglvl=95std option)
• Fortran 90, less any obsolescent features (-qlanglvl=90pure option)
• Fortran 95, less any obsolescent features (-qlanglvl=95pure option)
• IBM SAA FORTRAN (-qsaa option)

You can also use the langlvl environment variable for conformance checking.