IMO, the other languages (PL/I, C) also support building program objects
and very large
programs (> 16 MB), but COBOL with the newest compiler version REQUIRES
even small
programs to live in PDSEs (as program objects) and does not allow old
(classic) load modules.
I'm not sure about this, but IMO in some places in the OS "old" load
modules are still required
and program objects living in PDSEs cannot be used, maybe because PDSE
support requires
some help from the OS, and this is not available in the very early
stages after IPL.
Maybe, OTOH, nobody wants COBOL programs there ... these modules are
probably
PL/X or ASSEMBLER or Metal C ...
I cannot imagine a monolithic program with code size larger than 16 MB,
and a program which has
static tables bigger than 16 MB is, IMHO, a design failure. But this is
maybe an old school point of view ...
Kind regards
Bernd
Am 07.04.2023 um 01:09 schrieb Attila Fogarasi:
Cobol first started to use PDS/E in 2001 when exploiting new Cobol support
for long program names, object-oriented programs and for using the Binder
for DLLs instead of the prelinker. Program objects also cured the 16MB
maximum load module size which was becoming a problem (PO size limit is
1GB). There are probably other Cobol language features which require
PDS/E. I'm pretty sure this was just after Y2K, so over 20 years ago now.
Getting old enough to be called legacy :)
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