1 /* ANSI and traditional C compatability macros
2 Copyright 1991, 1992, 1996, 1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19 /* ANSI and traditional C compatibility macros
21 ANSI C is assumed if __STDC__ is #defined.
23 Macro ANSI C definition Traditional C definition
24 ----- ---- - ---------- ----------- - ----------
26 LONG_DOUBLE `long double' `double'
27 VOLATILE `volatile' `'
29 PTRCONST `void *const' `char *'
30 ANSI_PROTOTYPES 1 not defined
32 CONST is also defined, but is obsolete. Just use const.
34 obsolete -- DEFUN (name, arglist, args)
36 Defines function NAME.
38 ARGLIST lists the arguments, separated by commas and enclosed in
39 parentheses. ARGLIST becomes the argument list in traditional C.
41 ARGS list the arguments with their types. It becomes a prototype in
42 ANSI C, and the type declarations in traditional C. Arguments should
43 be separated with `AND'. For functions with a variable number of
44 arguments, the last thing listed should be `DOTS'.
46 obsolete -- DEFUN_VOID (name)
48 Defines a function NAME, which takes no arguments.
50 obsolete -- EXFUN (name, (prototype)) -- obsolete.
52 Replaced by PARAMS. Do not use; will disappear someday soon.
53 Was used in external function declarations.
54 In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
55 parentheses). In traditional C it is `NAME()'.
56 For a function that takes no arguments, PROTOTYPE should be `(void)'.
58 obsolete -- PROTO (type, name, (prototype) -- obsolete.
60 This one has also been replaced by PARAMS. Do not use.
64 We could use the EXFUN macro to handle prototype declarations, but
65 the name is misleading and the result is ugly. So we just define a
66 simple macro to handle the parameter lists, as in:
68 static int foo PARAMS ((int, char));
70 This produces: `static int foo();' or `static int foo (int, char);'
72 EXFUN would have done it like this:
74 static int EXFUN (foo, (int, char));
76 but the function is not external...and it's hard to visually parse
77 the function name out of the mess. EXFUN should be considered
78 obsolete; new code should be written to use PARAMS.
80 DOTS is also obsolete.
84 extern int printf PARAMS ((const char *format, ...));
92 /* Every source file includes this file,
93 so they will all get the switch for lint. */
97 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
98 /* All known AIX compilers implement these things (but don't always
99 define __STDC__). The RISC/OS MIPS compiler defines these things
100 in SVR4 mode, but does not define __STDC__. */
103 #define PTRCONST void *CONST
104 #define LONG_DOUBLE long double
109 #define VOLATILE volatile
110 #define SIGNED signed
111 #endif /* ! IN_GCC */
113 #define PARAMS(paramlist) paramlist
114 #define ANSI_PROTOTYPES 1
116 #define VPARAMS(ARGS) ARGS
117 #define VA_START(va_list,var) va_start(va_list,var)
119 /* These are obsolete. Do not use. */
123 #define PROTO(type, name, arglist) type name arglist
124 #define EXFUN(name, proto) name proto
125 #define DEFUN(name, arglist, args) name(args)
126 #define DEFUN_VOID(name) name(void)
127 #endif /* ! IN_GCC */
129 #else /* Not ANSI C. */
133 #define LONG_DOUBLE double
142 #ifndef const /* some systems define it in header files for non-ansi mode */
146 #define PARAMS(paramlist) ()
148 #define VPARAMS(ARGS) (va_alist) va_dcl
149 #define VA_START(va_list,var) va_start(va_list)
151 /* These are obsolete. Do not use. */
155 #define PROTO(type, name, arglist) type name ()
156 #define EXFUN(name, proto) name()
157 #define DEFUN(name, arglist, args) name arglist args;
158 #define DEFUN_VOID(name) name()
159 #endif /* ! IN_GCC */
163 /* Using MACRO(x,y) in cpp #if conditionals does not work with some
164 older preprocessors. Thus we can't define something like this:
166 #define HAVE_GCC_VERSION(MAJOR, MINOR) \
167 (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
169 and then test "#if HAVE_GCC_VERSION(2,7)".
171 So instead we use the macro below and test it against specific values. */
173 /* This macro simplifies testing whether we are using gcc, and if it
174 is of a particular minimum version. (Both major & minor numbers are
175 significant.) This macro will evaluate to 0 if we are not using
178 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
179 #endif /* GCC_VERSION */
181 /* Define macros for some gcc attributes. This permits us to use the
182 macros freely, and know that they will come into play for the
183 version of gcc in which they are supported. */
185 #if (GCC_VERSION < 2007)
186 # define __attribute__(x)
189 /* Attribute __malloc__ on functions was valid as of gcc 2.96. */
190 #ifndef ATTRIBUTE_MALLOC
191 # if (GCC_VERSION >= 2096)
192 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
194 # define ATTRIBUTE_MALLOC
195 # endif /* GNUC >= 2.96 */
196 #endif /* ATTRIBUTE_MALLOC */
198 /* Attributes on labels were valid as of gcc 2.93. */
199 #ifndef ATTRIBUTE_UNUSED_LABEL
200 # if (GCC_VERSION >= 2093)
201 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
203 # define ATTRIBUTE_UNUSED_LABEL
204 # endif /* GNUC >= 2.93 */
205 #endif /* ATTRIBUTE_UNUSED_LABEL */
207 #ifndef ATTRIBUTE_UNUSED
208 #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
209 #endif /* ATTRIBUTE_UNUSED */
211 #ifndef ATTRIBUTE_NORETURN
212 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
213 #endif /* ATTRIBUTE_NORETURN */
215 #ifndef ATTRIBUTE_PRINTF
216 #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
217 #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
218 #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
219 #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
220 #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
221 #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
222 #endif /* ATTRIBUTE_PRINTF */
224 #endif /* ansidecl.h */
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