/* ANSI and traditional C compatability macros
- Copyright 1991, 1992, 1996, 1999 Free Software Foundation, Inc.
+ Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
+ 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
+ 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
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. */
+Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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- CONST is also defined, but is obsolete.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- This one has also been replaced by PARAMS.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, ...));
-*/
+ 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
-#define _ANSIDECL_H 1
-
+#ifdef __cplusplus
+extern "C" {
+#endif
/* 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:
-#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 HAVE_GCC_VERSION(MAJOR, MINOR) \
+ (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
-#define PTR void *
-#define PTRCONST void *CONST
-#define LONG_DOUBLE long double
+and then test "#if HAVE_GCC_VERSION(2,7)".
-#ifndef IN_GCC
-#define AND ,
-#define NOARGS void
-#define VOLATILE volatile
-#define SIGNED signed
-#endif /* ! IN_GCC */
+So instead we use the macro below and test it against specific values. */
-#define PARAMS(paramlist) paramlist
-#define ANSI_PROTOTYPES 1
+/* 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 VPARAMS(ARGS) ARGS
-#define VA_START(va_list,var) va_start(va_list,var)
+#if defined (__STDC__) || defined(__cplusplus) || 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__. */
+/* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other
+ C++ compilers, does not define __STDC__, though it acts as if this
+ was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */
+
+#define ANSI_PROTOTYPES 1
+#define PTR void *
+#define PTRCONST void *const
+#define LONG_DOUBLE long double
+
+/* PARAMS is often defined elsewhere (e.g. by libintl.h), so wrap it in
+ a #ifndef. */
+#ifndef PARAMS
+#define PARAMS(ARGS) ARGS
+#endif
+
+#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 || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__))
+/* 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 DOTS , ...
+#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. */
-#define PTR char *
-#define PTRCONST PTR
-#define LONG_DOUBLE double
+#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 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 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. */
-/* This macro will return true if we are using gcc, and it is of a
- particular minimum version (both major & minor numbers are checked.) */
-#ifndef HAVE_GCC_VERSION
-#define HAVE_GCC_VERSION(MAJOR, MINOR) \
- (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
-#endif /* ! HAVE_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 ! HAVE_GCC_VERSION(2,7)
+#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 and g++ 4.5. For
+ g++ an attribute on a label must be followed by a semicolon. */
#ifndef ATTRIBUTE_UNUSED_LABEL
-# if ! HAVE_GCC_VERSION(2,93)
-# define ATTRIBUTE_UNUSED_LABEL
+# ifndef __cplusplus
+# if GCC_VERSION >= 2093
+# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
+# else
+# define ATTRIBUTE_UNUSED_LABEL
+# endif
# else
-# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
-# endif /* GNUC < 2.93 */
-#endif /* ATTRIBUTE_UNUSED_LABEL */
+# if GCC_VERSION >= 4005
+# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ;
+# else
+# define ATTRIBUTE_UNUSED_LABEL
+# endif
+# endif
+#endif
#ifndef ATTRIBUTE_UNUSED
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#endif /* ATTRIBUTE_UNUSED */
+/* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the
+ identifier name. */
+#if ! defined(__cplusplus) || (GCC_VERSION >= 3004)
+# define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED
+#else /* !__cplusplus || GNUC >= 3.4 */
+# define ARG_UNUSED(NAME) NAME
+#endif /* !__cplusplus || GNUC >= 3.4 */
+
#ifndef ATTRIBUTE_NORETURN
#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
#endif /* ATTRIBUTE_NORETURN */
+/* Attribute `nonnull' was valid as of gcc 3.3. */
+#ifndef ATTRIBUTE_NONNULL
+# if (GCC_VERSION >= 3003)
+# define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
+# else
+# define ATTRIBUTE_NONNULL(m)
+# endif /* GNUC >= 3.3 */
+#endif /* ATTRIBUTE_NONNULL */
+
+/* Attribute `pure' was valid as of gcc 3.0. */
+#ifndef ATTRIBUTE_PURE
+# if (GCC_VERSION >= 3000)
+# define ATTRIBUTE_PURE __attribute__ ((__pure__))
+# else
+# define ATTRIBUTE_PURE
+# endif /* GNUC >= 3.0 */
+#endif /* ATTRIBUTE_PURE */
+
+/* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL.
+ This was the case for the `printf' format attribute by itself
+ before GCC 3.3, but as of 3.3 we need to add the `nonnull'
+ attribute to retain this behavior. */
#ifndef ATTRIBUTE_PRINTF
-#define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
+#define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m)
#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_5 ATTRIBUTE_PRINTF(5, 6)
#endif /* ATTRIBUTE_PRINTF */
+/* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on
+ a function pointer. Format attributes were allowed on function
+ pointers as of gcc 3.1. */
+#ifndef ATTRIBUTE_FPTR_PRINTF
+# if (GCC_VERSION >= 3001)
+# define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n)
+# else
+# define ATTRIBUTE_FPTR_PRINTF(m, n)
+# endif /* GNUC >= 3.1 */
+# define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2)
+# define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3)
+# define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4)
+# define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5)
+# define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6)
+#endif /* ATTRIBUTE_FPTR_PRINTF */
+
+/* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A
+ NULL format specifier was allowed as of gcc 3.3. */
+#ifndef ATTRIBUTE_NULL_PRINTF
+# if (GCC_VERSION >= 3003)
+# define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
+# else
+# define ATTRIBUTE_NULL_PRINTF(m, n)
+# endif /* GNUC >= 3.3 */
+# define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2)
+# define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3)
+# define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4)
+# define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5)
+# define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6)
+#endif /* ATTRIBUTE_NULL_PRINTF */
+
+/* Attribute `sentinel' was valid as of gcc 3.5. */
+#ifndef ATTRIBUTE_SENTINEL
+# if (GCC_VERSION >= 3005)
+# define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__))
+# else
+# define ATTRIBUTE_SENTINEL
+# endif /* GNUC >= 3.5 */
+#endif /* ATTRIBUTE_SENTINEL */
+
+
+#ifndef ATTRIBUTE_ALIGNED_ALIGNOF
+# if (GCC_VERSION >= 3000)
+# define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m))))
+# else
+# define ATTRIBUTE_ALIGNED_ALIGNOF(m)
+# endif /* GNUC >= 3.0 */
+#endif /* ATTRIBUTE_ALIGNED_ALIGNOF */
+
+/* Useful for structures whose layout must much some binary specification
+ regardless of the alignment and padding qualities of the compiler. */
+#ifndef ATTRIBUTE_PACKED
+# define ATTRIBUTE_PACKED __attribute__ ((packed))
+#endif
+
+/* Attribute `hot' and `cold' was valid as of gcc 4.3. */
+#ifndef ATTRIBUTE_COLD
+# if (GCC_VERSION >= 4003)
+# define ATTRIBUTE_COLD __attribute__ ((__cold__))
+# else
+# define ATTRIBUTE_COLD
+# endif /* GNUC >= 4.3 */
+#endif /* ATTRIBUTE_COLD */
+#ifndef ATTRIBUTE_HOT
+# if (GCC_VERSION >= 4003)
+# define ATTRIBUTE_HOT __attribute__ ((__hot__))
+# else
+# define ATTRIBUTE_HOT
+# endif /* GNUC >= 4.3 */
+#endif /* ATTRIBUTE_HOT */
+
+/* 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
+
+/* This is used to declare a const variable which should be visible
+ outside of the current compilation unit. Use it as
+ EXPORTED_CONST int i = 1;
+ This is because the semantics of const are different in C and C++.
+ "extern const" is permitted in C but it looks strange, and gcc
+ warns about it when -Wc++-compat is not used. */
+#ifdef __cplusplus
+#define EXPORTED_CONST extern const
+#else
+#define EXPORTED_CONST const
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
#endif /* ansidecl.h */
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