[Bug-GnuCOBOL] UNDATE FUNCTION

[Michael Potter]

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:

https://www.ibm.com/support/knowledgecenter/en/SSQ2R2_9.1.1/com.ibm.etools.cbl.win.doc/topics/tpmle23e.htm

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?