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The Question is: How can I determine the version of C compiler running? How can I determine if UTC is available: because gmtime() seems to return null. The Answer is :
Most (all?) versions of DEC C support a /VERSION qualifier, which will
display the compiler version:
CC [/DECC] /VERSION NLA0:
Under either compiler, the following brute-force technique -- looking
at the version information in the listings -- can also be used:
CC [/DECC] [/VAXC] NLA0:/LIST=TT:/NOOBJECT
Baseline system UTC support was added to OpenVMS V6.0, with subsequent
enhancements in later releases. The C gmtime call was first supported
with OpenVMS V6.1.
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The last version of VAX C was V3.2 -- the current version of C (and
specifically of DEC C) is V5.7. (DEC C V4.0 is an ANSI C compiler,
and it replaced the non-ANSI C VAX C V3.2 compiler many years ago.)
Various DEC C versions also support and can be used on OpenVMS VAX
V5.5-2, and both DEC C and VAX C can be installed on the same OpenVMS
VAX system, and the proper compiler can then be selected as required.
DEC C also includes a mode where it can compile nearly all VAX C coding
constructs.
OpenVMS VAX V5.5-2 is also rather old -- the current version of OpenVMS
is V7.1. The C run-time libraries -- the libraries ship with OpenVMS
-- have also seen a number of new C functions added into the OpenVMS
V7.0 and later releases...
DEC C V5.6 and later also include a "backport" library, which allows
more recent C library calls to be used from programs developed on older
OpenVMS versions.
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