Description

The C and C++ compilers on Digital UNIX / Tru64, ULTRIX, and VMS.

The Ultrix C compiler is essentially the same as the BSD C compiler and thus has no version macro, you just look out for the ultrix macro.

Macros

Examples

Notes

With OSF/1, you really want to be using the -std1 -isoc94 compiler flags at all times.

The -isoc94 compiler flag will make __STDC__ available, and the -std or -std1 flags will make __STDC_VERSION__ available.

On ULTRIX it will be worth including sys/ansi_compat.h too so that preprocessor symbols are on a par with those on OSF/1. I am not sure if they will be similar to those on VMS.

Example Code

#include <stdio.h>
#include <sys/ansi_compat.h>

int
main()
{
#if defined(__DECC)
    printf("DEC C compiler\n");
#elif defined(__DECCXX)
    printf("DEC C++ compiler\n");
#elif defined(__VAXC)
    printf("VAX C compiler\n");
#elif defined(__VAX11C)
    /* I'd assume this is for ULTRIX on the VAX-11. */
    printf("VAX-11 C compiler\n");
#else
# if defined(__ultrix)
    printf("ULTRIX C compiler\n");
# endif
#else
    printf("Unknown C compiler\n");
#endif
}