This information is from defind.c, version 3, of 3 June 1991.

The following tokens are predefined by the preprocessor/compiler for
VAX 8600, VMS 5.2, VAX C 3.0:
               CC$gfloat (0)
             CC$parallel (0)
                     VAX (1)
                     vax (1)
                  VAX11C (1)
                  vax11c (1)
                    VAXC (1)
                    vaxc (1)
                     VMS (1)
                     vms (1)
             VMS_VERSION (V5.2   )
             vms_version (V5.2   )

Additionally, the following standard tokens are defined:
                __FILE__ (SCRATCH$DISK:[ROELOFS.DL]DEFIND.C;1)
                __LINE__ (5526)
                __DATE__ (Jun  4 1991)
                __TIME__ (00:00:08)
