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gcc/include/ansidecl.h
Zack Weinberg 8784fdcd69 cpphash.h: Remove conditional #define of __extension__. 
gcc:
	* cpphash.h: Remove conditional #define of __extension__.
	* rtl.h: Add __extension__ to RTL_CHECK1, RTL_CHECK2,
	RTL_CHECKC1, RTL_CHECKC2, and RTVEC_ELT macros
	(ENABLE_RTL_CHECKING only).
	* tree.h: Add __extension__ to TREE_CHECK, TREE_CLASS_CHECK,
	CST_OR_CONSTRUCTOR_CHECK, and EXPR_CHECK macros
	(ENABLE_TREE_CHECKING only).
	* varray.h: Add __extension__ to VARRAY_CHECK macro
	(ENABLE_CHECKING only).

include:
	* ansidecl.h: #define __extension__ to nothing if
	GCC_VERSION < 2008.

From-SVN: r33733
2000-05-06 20:00:03 +00:00

233 lines
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/* ANSI and traditional C compatability macros
Copyright 1991, 1992, 1996, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* ANSI and traditional C compatibility macros
ANSI C is assumed if __STDC__ is #defined.
Macro ANSI C definition Traditional C definition
----- ---- - ---------- ----------- - ----------
PTR `void *' `char *'
LONG_DOUBLE `long double' `double'
VOLATILE `volatile' `'
SIGNED `signed' `'
PTRCONST `void *const' `char *'
ANSI_PROTOTYPES 1 not defined
CONST is also defined, but is obsolete. Just use const.
obsolete -- DEFUN (name, arglist, args)
Defines function NAME.
ARGLIST lists the arguments, separated by commas and enclosed in
parentheses. ARGLIST becomes the argument list in traditional C.
ARGS list the arguments with their types. It becomes a prototype in
ANSI C, and the type declarations in traditional C. Arguments should
be separated with `AND'. For functions with a variable number of
arguments, the last thing listed should be `DOTS'.
obsolete -- DEFUN_VOID (name)
Defines a function NAME, which takes no arguments.
obsolete -- EXFUN (name, (prototype)) -- obsolete.
Replaced by PARAMS. Do not use; will disappear someday soon.
Was used in external function declarations.
In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
parentheses). In traditional C it is `NAME()'.
For a function that takes no arguments, PROTOTYPE should be `(void)'.
obsolete -- PROTO (type, name, (prototype) -- obsolete.
This one has also been replaced by PARAMS. Do not use.
PARAMS ((args))
We could use the EXFUN macro to handle prototype declarations, but
the name is misleading and the result is ugly. So we just define a
simple macro to handle the parameter lists, as in:
static int foo PARAMS ((int, char));
This produces: `static int foo();' or `static int foo (int, char);'
EXFUN would have done it like this:
static int EXFUN (foo, (int, char));
but the function is not external...and it's hard to visually parse
the function name out of the mess. EXFUN should be considered
obsolete; new code should be written to use PARAMS.
DOTS is also obsolete.
Examples:
extern int printf PARAMS ((const char *format, ...));
*/
#ifndef _ANSIDECL_H
#define _ANSIDECL_H 1
/* Every source file includes this file,
so they will all get the switch for lint. */
/* LINTLIBRARY */
#if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
/* All known AIX compilers implement these things (but don't always
define __STDC__). The RISC/OS MIPS compiler defines these things
in SVR4 mode, but does not define __STDC__. */
#define PTR void *
#define PTRCONST void *CONST
#define LONG_DOUBLE long double
#ifndef IN_GCC
#define AND ,
#define NOARGS void
#define VOLATILE volatile
#define SIGNED signed
#endif /* ! IN_GCC */
#define PARAMS(paramlist) paramlist
#define ANSI_PROTOTYPES 1
#define VPARAMS(ARGS) ARGS
#define VA_START(va_list,var) va_start(va_list,var)
/* These are obsolete. Do not use. */
#ifndef IN_GCC
#define CONST const
#define DOTS , ...
#define PROTO(type, name, arglist) type name arglist
#define EXFUN(name, proto) name proto
#define DEFUN(name, arglist, args) name(args)
#define DEFUN_VOID(name) name(void)
#endif /* ! IN_GCC */
#else /* Not ANSI C. */
#define PTR char *
#define PTRCONST PTR
#define LONG_DOUBLE double
#ifndef IN_GCC
#define AND ;
#define NOARGS
#define VOLATILE
#define SIGNED
#endif /* !IN_GCC */
#ifndef const /* some systems define it in header files for non-ansi mode */
#define const
#endif
#define PARAMS(paramlist) ()
#define VPARAMS(ARGS) (va_alist) va_dcl
#define VA_START(va_list,var) va_start(va_list)
/* These are obsolete. Do not use. */
#ifndef IN_GCC
#define CONST
#define DOTS
#define PROTO(type, name, arglist) type name ()
#define EXFUN(name, proto) name()
#define DEFUN(name, arglist, args) name arglist args;
#define DEFUN_VOID(name) name()
#endif /* ! IN_GCC */
#endif /* ANSI C. */
/* Using MACRO(x,y) in cpp #if conditionals does not work with some
older preprocessors. Thus we can't define something like this:
#define HAVE_GCC_VERSION(MAJOR, MINOR) \
(__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
and then test "#if HAVE_GCC_VERSION(2,7)".
So instead we use the macro below and test it against specific values. */
/* This macro simplifies testing whether we are using gcc, and if it
is of a particular minimum version. (Both major & minor numbers are
significant.) This macro will evaluate to 0 if we are not using
gcc at all. */
#ifndef GCC_VERSION
#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
#endif /* GCC_VERSION */
/* Define macros for some gcc attributes. This permits us to use the
macros freely, and know that they will come into play for the
version of gcc in which they are supported. */
#if (GCC_VERSION < 2007)
# define __attribute__(x)
#endif
/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
#ifndef ATTRIBUTE_MALLOC
# if (GCC_VERSION >= 2096)
# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
# else
# define ATTRIBUTE_MALLOC
# endif /* GNUC >= 2.96 */
#endif /* ATTRIBUTE_MALLOC */
/* Attributes on labels were valid as of gcc 2.93. */
#ifndef ATTRIBUTE_UNUSED_LABEL
# if (GCC_VERSION >= 2093)
# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
# else
# define ATTRIBUTE_UNUSED_LABEL
# endif /* GNUC >= 2.93 */
#endif /* ATTRIBUTE_UNUSED_LABEL */
#ifndef ATTRIBUTE_UNUSED
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#endif /* ATTRIBUTE_UNUSED */
#ifndef ATTRIBUTE_NORETURN
#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
#endif /* ATTRIBUTE_NORETURN */
#ifndef ATTRIBUTE_PRINTF
#define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
#define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
#define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
#define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
#define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
#define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
#endif /* ATTRIBUTE_PRINTF */
/* We use __extension__ in some places to suppress -pedantic warnings
about GCC extensions. This feature didn't work properly before
gcc 2.8. */
#if GCC_VERSION < 2008
#define __extension__
#endif
#endif /* ansidecl.h */
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