545a62103a959f43d0109d4be4e27c2cfdc59d4e
1 /* ANSI and traditional C compatability macros
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ANSI and traditional C compatibility macros
22 ANSI C is assumed if __STDC__ is #defined.
24 Macro ANSI C definition Traditional C definition
25 ----- ---- - ---------- ----------- - ----------
27 LONG_DOUBLE `long double' `double'
28 VOLATILE `volatile' `'
30 PTRCONST `void *const' `char *'
31 ANSI_PROTOTYPES 1 not defined
33 CONST is also defined, but is obsolete. Just use const.
35 obsolete -- DEFUN (name, arglist, args)
37 Defines function NAME.
39 ARGLIST lists the arguments, separated by commas and enclosed in
40 parentheses. ARGLIST becomes the argument list in traditional C.
42 ARGS list the arguments with their types. It becomes a prototype in
43 ANSI C, and the type declarations in traditional C. Arguments should
44 be separated with `AND'. For functions with a variable number of
45 arguments, the last thing listed should be `DOTS'.
47 obsolete -- DEFUN_VOID (name)
49 Defines a function NAME, which takes no arguments.
51 obsolete -- EXFUN (name, (prototype)) -- obsolete.
53 Replaced by PARAMS. Do not use; will disappear someday soon.
54 Was used in external function declarations.
55 In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
56 parentheses). In traditional C it is `NAME()'.
57 For a function that takes no arguments, PROTOTYPE should be `(void)'.
59 obsolete -- PROTO (type, name, (prototype) -- obsolete.
61 This one has also been replaced by PARAMS. Do not use.
65 We could use the EXFUN macro to handle prototype declarations, but
66 the name is misleading and the result is ugly. So we just define a
67 simple macro to handle the parameter lists, as in:
69 static int foo PARAMS ((int, char));
71 This produces: `static int foo();' or `static int foo (int, char);'
73 EXFUN would have done it like this:
75 static int EXFUN (foo, (int, char));
77 but the function is not external...and it's hard to visually parse
78 the function name out of the mess. EXFUN should be considered
79 obsolete; new code should be written to use PARAMS.
81 DOTS is also obsolete.
85 extern int printf PARAMS ((const char *format, ...));
93 /* Every source file includes this file,
94 so they will all get the switch for lint. */
98 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
99 /* All known AIX compilers implement these things (but don't always
100 define __STDC__). The RISC/OS MIPS compiler defines these things
101 in SVR4 mode, but does not define __STDC__. */
104 #define PTRCONST void *CONST
105 #define LONG_DOUBLE long double
110 #define VOLATILE volatile
111 #define SIGNED signed
112 #endif /* ! IN_GCC */
114 #define PARAMS(paramlist) paramlist
115 #define ANSI_PROTOTYPES 1
117 #define VPARAMS(ARGS) ARGS
118 #define VA_START(va_list,var) va_start(va_list,var)
120 /* These are obsolete. Do not use. */
124 #define PROTO(type, name, arglist) type name arglist
125 #define EXFUN(name, proto) name proto
126 #define DEFUN(name, arglist, args) name(args)
127 #define DEFUN_VOID(name) name(void)
128 #endif /* ! IN_GCC */
130 #else /* Not ANSI C. */
134 #define LONG_DOUBLE double
143 #ifndef const /* some systems define it in header files for non-ansi mode */
147 #define PARAMS(paramlist) ()
149 #define VPARAMS(ARGS) (va_alist) va_dcl
150 #define VA_START(va_list,var) va_start(va_list)
152 /* These are obsolete. Do not use. */
156 #define PROTO(type, name, arglist) type name ()
157 #define EXFUN(name, proto) name()
158 #define DEFUN(name, arglist, args) name arglist args;
159 #define DEFUN_VOID(name) name()
160 #endif /* ! IN_GCC */
165 /* Using MACRO(x,y) in cpp #if conditionals does not work with some
166 older preprocessors. Thus we can't define something like this:
168 #define HAVE_GCC_VERSION(MAJOR, MINOR) \
169 (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
171 and then test "#if HAVE_GCC_VERSION(2,7)".
173 So instead we use the macro below and test it against specific values. */
175 /* This macro simplifies testing whether we are using gcc, and if it
176 is of a particular minimum version. (Both major & minor numbers are
177 significant.) This macro will evaluate to 0 if we are not using
180 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
181 #endif /* GCC_VERSION */
183 /* Define macros for some gcc attributes. This permits us to use the
184 macros freely, and know that they will come into play for the
185 version of gcc in which they are supported. */
187 #if (GCC_VERSION < 2007)
188 # define __attribute__(x)
191 /* Attribute __malloc__ on functions was valid as of gcc 2.96. */
192 #ifndef ATTRIBUTE_MALLOC
193 # if (GCC_VERSION >= 2096)
194 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
196 # define ATTRIBUTE_MALLOC
197 # endif /* GNUC >= 2.96 */
198 #endif /* ATTRIBUTE_MALLOC */
200 /* Attributes on labels were valid as of gcc 2.93. */
201 #ifndef ATTRIBUTE_UNUSED_LABEL
202 # if (GCC_VERSION >= 2093)
203 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
205 # define ATTRIBUTE_UNUSED_LABEL
206 # endif /* GNUC >= 2.93 */
207 #endif /* ATTRIBUTE_UNUSED_LABEL */
209 #ifndef ATTRIBUTE_UNUSED
210 #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
211 #endif /* ATTRIBUTE_UNUSED */
213 #ifndef ATTRIBUTE_NORETURN
214 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
215 #endif /* ATTRIBUTE_NORETURN */
217 #ifndef ATTRIBUTE_PRINTF
218 #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
219 #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
220 #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
221 #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
222 #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
223 #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
224 #endif /* ATTRIBUTE_PRINTF */
226 /* We use __extension__ in some places to suppress -pedantic warnings
227 about GCC extensions. This feature didn't work properly before
229 #if GCC_VERSION < 2008
230 #define __extension__
233 #endif /* ansidecl.h */