How Import Requests Are Resolved

Whenever modules from different sources are combined into a single program, the compiler might have to process duplicate symbols.

Whenever you enter a CRTPGM command, the ILE compiler resolves import requests by:
  1. Copying listed modules into what will become the program object and links any service programs to the program object.
  2. Identifying the module containing the program entry procedure and locates the first import in this module.
  3. Checking the modules in the order in which they are listed and matches the first import with a module export.
  4. Returning to the first module and locates the next import.
  5. Resolving all imports in the first module.
  6. Continuing to the next module and resolving all imports in each subsequent module until all imports have been resolved.
After all the imports have been resolved, the ILE compiler completes the binding process and creates the program object. If any imports cannot be resolved with an export, the compiler terminates the binding process without creating a program object.
Note: If you have specified in the binder language that a variable is to be exported (using the EXPORT keyword), it is possible that the variable name will be identical to a variable in another procedure within the bound program object. You can use the *DUPPROC option on the CRTPGM OPTION parameter to allow duplicate procedure names. See the ILE C/C++ Compiler Reference for further information on how to handle this situation.