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Digital UNIX 4.0E Documentation Library

Useful Stuff

Tricks

Compiler macros?

You probably maybe possibly really want to use -std1 -isoc94 at all times maybe!

Preprocessor	Description	Compiler flag
`__DECC`	DEC C compiler	`-std0`
`__DECC_VER`	DEC C compiler	`-std0`
`__osf__`	Platform is DEC OSF/1	(or `-std -std0 -std1`)
`__alpha`	Platform is Alpha	(or `-std -std0 -std1`)
`__STDC__`	Compiler conforms to an ISO C standard	`-isoc94`
`__STDC_VERSION__`	ISO C standard compiler comforms to	(or `-std -std1`) and `-isoc94`

For example, the following code requires the flags -std1 -isoc94 to be passed to cc.

#include <stdio.h>

int
main(void)
{
#if defined(__DECC)
  printf("DEC C compiler\n");
#endif

#if defined(__DECC_VER)
  printf("Version %d\n", __DECC_VER);
#endif

#if defined(__alpha)
  printf("Alpha\n");
#endif

#if defined(__osf__)
  printf("DEC OSF/1\n");
#endif

#if defined(__STDC__)
# if defined(__STDC_VERSION__)
  printf("C Standard: %d\n", __STDC_VERSION__);
# endif
#endif

  return 0;
}