User's Guide

Chapter 4. Editing, Compiling, Linking, and Running XL Fortran Programs

Partial Table-of-Contents

Most Fortran program development consists of a repeating cycle of editing, compiling and linking (which is by default a single step), and running. If you encounter problems at some part of this cycle, you may need to refer to the chapters that follow this one for help with optimizing, debugging, and so on.

Prerequisite Information:

1. Before you can use the compiler, all the required AIX settings (for example, certain environment variables and storage limits) must be correct for your user ID; for details, see Correct Settings for Environment Variables.
2. Before using the compiler for a specialized purpose, such as porting or performance tuning, look at the categories of options in Summary of the XL Fortran Compiler Options to see if XL Fortran already provides a solution.
3. To learn more about writing Fortran programs, refer to the XL Fortran for AIX Language Reference.

Note that if you are using AIX Version 4.3, you can substitute references to libxlf90_r.a in this chapter with references to libxlf90.a. This is because on AIX Version 4.3, a link is provided from the libxlf90_r.a library to the libxlf90.a library. You do not need to link with separate libraries depending on whether you are creating a threaded or a non-threaded application. XL Fortran determines at run time whether your application is threaded.