Building a Mixed Language Application

Compiling and linking a mixed language application, and preserving the COBOL run-time system when calling a non-COBOL program.

You can create applications that have both COBOL and non-COBOL programs calling each other. To do this:

  1. Make sure any non-COBOL program that runs preserves the COBOL run-time system, as follows:
    • The called program must preserve the local COBOL run environment (that is, the registers) according to C calling conventions
    • The global COBOL run environment (that is, data areas allocated by the COBOL system, open file, buffers, environment variables, and so on) must not be destroyed or altered, except under the direct control of the COBOL system.
  2. Compile the non-COBOL programs to standard Intel native object code.