I am getting the following errors when I compile some code that originated on an IBM Mainframe:
SOMEPROG.cbl: 1659: error: FUNCTION 'DATEVAL' unknown
SOMEPROG.cbl: 1663: error: FUNCTION 'UNDATE' unknown
Here is IBM's description of UNDATE:
What is the consensus on handling UNDATE and DATEVAL in GnuCOBOL?
For the general case: How does one go about implementing a new function in GnuCOBOL?