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/* ANSI and traditional C compatability macros

   Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001

   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

   -----                ---- - ----------       ----------- - ----------

   ANSI_PROTOTYPES      1                       not defined

   PTR                  `void *'                `char *'

   PTRCONST             `void *const'           `char *'

   LONG_DOUBLE          `long double'           `double'

   const                not defined             `'

   volatile             not defined             `'

   signed               not defined             `'

   VA_START(ap, var)    va_start(ap, var)       va_start(ap)

   Note that it is safe to write "void foo();" indicating a function

   with no return value, in all K+R compilers we have been able to test.

   For declaring functions with prototypes, we also provide these:

   PARAMS ((prototype))

   -- for functions which take a fixed number of arguments.  Use this

   when declaring the function.  When defining the function, write a

   K+R style argument list.  For example:

        char *strcpy PARAMS ((char *dest, char *source));

        ...

        char *

        strcpy (dest, source)

             char *dest;

             char *source;

        { ... }

   VPARAMS ((prototype, ...))

   -- for functions which take a variable number of arguments.  Use

   PARAMS to declare the function, VPARAMS to define it.  For example:

        int printf PARAMS ((const char *format, ...));

        ...

        int

        printf VPARAMS ((const char *format, ...))

        {

           ...

        }

   For writing functions which take variable numbers of arguments, we

   also provide the VA_OPEN, VA_CLOSE, and VA_FIXEDARG macros.  These

   hide the differences between K+R <varargs.h> and C89 <stdarg.h> more

   thoroughly than the simple VA_START() macro mentioned above.

   VA_OPEN and VA_CLOSE are used *instead of* va_start and va_end.

   Immediately after VA_OPEN, put a sequence of VA_FIXEDARG calls

   corresponding to the list of fixed arguments.  Then use va_arg

   normally to get the variable arguments, or pass your va_list object

   around.  You do not declare the va_list yourself; VA_OPEN does it

   for you.

   Here is a complete example:

        int

        printf VPARAMS ((const char *format, ...))

        {

           int result;

           VA_OPEN (ap, format);

           VA_FIXEDARG (ap, const char *, format);

           result = vfprintf (stdout, format, ap);

           VA_CLOSE (ap);

           return result;

        }

   You can declare variables either before or after the VA_OPEN,

   VA_FIXEDARG sequence.  Also, VA_OPEN and VA_CLOSE are the beginning

   and end of a block.  They must appear at the same nesting level,

   and any variables declared after VA_OPEN go out of scope at

   VA_CLOSE.  Unfortunately, with a K+R compiler, that includes the

   argument list.  You can have multiple instances of VA_OPEN/VA_CLOSE

   pairs in a single function in case you need to traverse the

   argument list more than once.

   For ease of writing code which uses GCC extensions but needs to be

   portable to other compilers, we provide the GCC_VERSION macro that

   simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various

   wrappers around __attribute__.  Also, __extension__ will be #defined

   to nothing if it doesn't work.  See below.

   This header also defines a lot of obsolete macros:

   CONST, VOLATILE, SIGNED, PROTO, EXFUN, DEFUN, DEFUN_VOID,

   AND, DOTS, NOARGS.  Don't use them.  */

#ifndef _ANSIDECL_H

#define _ANSIDECL_H     1

/* Every source file includes this file,

   so they will all get the switch for lint.  */

/* LINTLIBRARY */

/* 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 */

#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 ANSI_PROTOTYPES 1

#define PTR             void *

#define PTRCONST        void *const

#define LONG_DOUBLE     long double

#define PARAMS(ARGS)            ARGS

#define VPARAMS(ARGS)           ARGS

#define VA_START(VA_LIST, VAR)  va_start(VA_LIST, VAR)

/* variadic function helper macros */

/* "struct Qdmy" swallows the semicolon after VA_OPEN/VA_FIXEDARG's

   use without inhibiting further decls and without declaring an

   actual variable.  */

#define VA_OPEN(AP, VAR)        { va_list AP; va_start(AP, VAR); { struct Qdmy

#define VA_CLOSE(AP)            } va_end(AP); }

#define VA_FIXEDARG(AP, T, N)   struct Qdmy

#undef const

#undef volatile

#undef signed

/* inline requires special treatment; it's in C99, and GCC >=2.7 supports

   it too, but it's not in C89.  */

#undef inline

#if __STDC_VERSION__ > 199901L

/* it's a keyword */

#else

# if GCC_VERSION >= 2007

#  define inline __inline__   /* __inline__ prevents -pedantic warnings */

# else

#  define inline  /* nothing */

# endif

#endif

/* These are obsolete.  Do not use.  */

#ifndef IN_GCC

#define CONST           const

#define VOLATILE        volatile

#define SIGNED          signed

#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)

#define AND             ,

#define DOTS            , ...

#define NOARGS          void

#endif /* ! IN_GCC */

#else   /* Not ANSI C.  */

#undef  ANSI_PROTOTYPES

#define PTR             char *

#define PTRCONST        PTR

#define LONG_DOUBLE     double

#define PARAMS(args)            ()

#define VPARAMS(args)           (va_alist) va_dcl

#define VA_START(va_list, var)  va_start(va_list)

#define VA_OPEN(AP, VAR)                { va_list AP; va_start(AP); { struct Qdmy

#define VA_CLOSE(AP)                    } va_end(AP); }

#define VA_FIXEDARG(AP, TYPE, NAME)     TYPE NAME = va_arg(AP, TYPE)

/* some systems define these in header files for non-ansi mode */

#undef const

#undef volatile

#undef signed

#undef inline

#define const

#define volatile

#define signed

#define inline

#ifndef IN_GCC

#define CONST

#define VOLATILE

#define SIGNED

#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()

#define AND             ;

#define DOTS

#define NOARGS

#endif /* ! IN_GCC */

#endif  /* ANSI C.  */

/* 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

/* Bootstrap support:  Adjust certain macros defined by Autoconf,

   which are only valid for the stage1 compiler.  If we detect

   a modern version of GCC, we are probably in stage2 or beyond,

   so unconditionally reset the values.  Note that const, inline,

   etc. have been dealt with above.  */

#if (GCC_VERSION >= 2007)

# ifndef HAVE_LONG_DOUBLE

#  define HAVE_LONG_DOUBLE 1

# endif

#endif /* GCC >= 2.7 */

#endif  /* ansidecl.h   */