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Removed support for the gcc-2.[0-4] keywords __dead and __pure. They

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stopped being used in /usr/src almost 2 years ago.

Don't pretend to support gcc-[3-infinity].

Added __printf0like().  Feature tests for the __printf0__ feature
are problematic, so this can't be used for the err() family yet
- it's only in recent versions of FreeBSD's hacked version of gcc.

Added comments about __unused and __*like().
This commit is contained in:
bde 1998-08-24 06:17:01 +00:00
parent fdc8423b8e
commit 7e129aa030
1 changed files with 17 additions and 22 deletions
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39
sys/sys/cdefs.h
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
* $Id: cdefs.h,v 1.19 1998/07/13 06:45:13 bde Exp $
* $Id: cdefs.h,v 1.20 1998/07/25 14:37:37 dfr Exp $
*/
#ifndef _SYS_CDEFS_H_
@ -106,48 +106,43 @@
#endif /* !(__STDC__ || __cplusplus) */
/*
* GCC1 and some versions of GCC2 declare dead (non-returning) and
* pure (no side effects) functions using "volatile" and "const";
* unfortunately, these then cause warnings under "-ansi -pedantic".
* GCC2.5 uses a new, peculiar __attribute__((attrs)) style. All of
* these work for GNU C++ (modulo a slight glitch in the C++ grammar
* in the distribution version of 2.5.5).
* Compiler-dependent macros to help declare dead (non-returning) and
* pure (no side effects) functions, and unused variables. They are
* null except for versions of gcc that are known to support the features
* properly (old versions of gcc-2 supported the dead and pure features
* in a different (wrong) way).
*/
#if __GNUC__ < 2
#define __dead
#if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 5
#define __dead2
#define __pure
#define __pure2
#define __unused
#endif
#if __GNUC__ == 2 && __GNUC_MINOR__ < 5
#define __dead __volatile
#define __dead2
#define __pure __const
#define __pure2
#define __unused
#endif
#if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7
#define __dead
#define __dead2 __attribute__((__noreturn__))
#define __pure
#define __pure2 __attribute__((__const__))
#define __unused
#endif
#if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3
#define __dead
#if __GNUC__ == 2 && __GNUC_MINOR__ >= 7
#define __dead2 __attribute__((__noreturn__))
#define __pure
#define __pure2 __attribute__((__const__))
#define __unused __attribute__((__unused__))
#endif
/*
* Compiler-dependent macros to declare that functions take printf-like
* or scanf-like arguments. They are null except for versions of gcc
* that are known to support the features properly (old versions of gcc-2
* didn't permit keeping the keywords out of the application namespace).
*/
#if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 7
#define __printflike(fmtarg, firstvararg)
#define __printf0like(fmtarg, firstvararg)
#define __scanflike(fmtarg, firstvararg)
#else
#define __printflike(fmtarg, firstvararg) \
__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
#define __printf0like(fmtarg, firstvararg) \
__attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
#define __scanflike(fmtarg, firstvararg) \
__attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
#endif