Do I need to recompile?

Ideally, programs should be compiled with a supported compiler (currently only IBM® Enterprise COBOL for z/OS® is supported) and run with a supported runtime library (Language Environment® for a supported version of z/OS). You can migrate programs gradually, in two stages:
  • Stage 1: Runtime migration. You can use the Enterprise COBOL V4.2 Compiler and Runtime Migration Guide at http://publibfp.dhe.ibm.com/epubs/pdf/igy3mg50.pdf for help in completing your runtime library migration.
  • Stage 2: Compiler migration (you may compile only one or many programs in existing applications)

The remainder of this section explains when and why you might want to migrate your applications (run time or source). It includes the following topics: