| 1 | /* ANSI and traditional C compatability macros
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| 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000
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| 3 | Free Software Foundation, Inc.
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| 4 | This file is part of the GNU C Library.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 19 |
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| 20 | /* ANSI and traditional C compatibility macros
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| 21 |
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| 22 | ANSI C is assumed if __STDC__ is #defined.
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| 23 |
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| 24 | Macro ANSI C definition Traditional C definition
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| 25 | ----- ---- - ---------- ----------- - ----------
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| 26 | PTR `void *' `char *'
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| 27 | LONG_DOUBLE `long double' `double'
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| 28 | VOLATILE `volatile' `'
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| 29 | SIGNED `signed' `'
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| 30 | PTRCONST `void *const' `char *'
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| 31 | ANSI_PROTOTYPES 1 not defined
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| 32 |
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| 33 | CONST is also defined, but is obsolete. Just use const.
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| 34 |
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| 35 | obsolete -- DEFUN (name, arglist, args)
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| 36 |
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| 37 | Defines function NAME.
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| 38 |
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| 39 | ARGLIST lists the arguments, separated by commas and enclosed in
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| 40 | parentheses. ARGLIST becomes the argument list in traditional C.
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| 41 |
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| 42 | ARGS list the arguments with their types. It becomes a prototype in
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| 43 | ANSI C, and the type declarations in traditional C. Arguments should
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| 44 | be separated with `AND'. For functions with a variable number of
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| 45 | arguments, the last thing listed should be `DOTS'.
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| 46 |
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| 47 | obsolete -- DEFUN_VOID (name)
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| 48 |
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| 49 | Defines a function NAME, which takes no arguments.
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| 50 |
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| 51 | obsolete -- EXFUN (name, (prototype)) -- obsolete.
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| 52 |
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| 53 | Replaced by PARAMS. Do not use; will disappear someday soon.
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| 54 | Was used in external function declarations.
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| 55 | In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
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| 56 | parentheses). In traditional C it is `NAME()'.
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| 57 | For a function that takes no arguments, PROTOTYPE should be `(void)'.
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| 58 |
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| 59 | obsolete -- PROTO (type, name, (prototype) -- obsolete.
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| 60 |
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| 61 | This one has also been replaced by PARAMS. Do not use.
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| 62 |
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| 63 | PARAMS ((args))
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| 64 |
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| 65 | We could use the EXFUN macro to handle prototype declarations, but
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| 66 | the name is misleading and the result is ugly. So we just define a
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| 67 | simple macro to handle the parameter lists, as in:
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| 68 |
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| 69 | static int foo PARAMS ((int, char));
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| 70 |
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| 71 | This produces: `static int foo();' or `static int foo (int, char);'
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| 72 |
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| 73 | EXFUN would have done it like this:
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| 74 |
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| 75 | static int EXFUN (foo, (int, char));
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| 76 |
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| 77 | but the function is not external...and it's hard to visually parse
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| 78 | the function name out of the mess. EXFUN should be considered
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| 79 | obsolete; new code should be written to use PARAMS.
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| 80 |
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| 81 | DOTS is also obsolete.
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| 82 |
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| 83 | Examples:
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| 84 |
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| 85 | extern int printf PARAMS ((const char *format, ...));
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| 86 | */
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| 87 |
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| 88 | #ifndef _ANSIDECL_H
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| 89 |
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| 90 | #define _ANSIDECL_H 1
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| 91 |
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| 92 |
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| 93 | /* Every source file includes this file,
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| 94 | so they will all get the switch for lint. */
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| 95 | /* LINTLIBRARY */
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| 96 |
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| 97 |
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| 98 | #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
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| 99 | /* All known AIX compilers implement these things (but don't always
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| 100 | define __STDC__). The RISC/OS MIPS compiler defines these things
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| 101 | in SVR4 mode, but does not define __STDC__. */
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| 102 |
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| 103 | #define PTR void *
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| 104 | #define PTRCONST void *CONST
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| 105 | #define LONG_DOUBLE long double
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| 106 |
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| 107 | #ifndef IN_GCC
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| 108 | #define AND ,
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| 109 | #define NOARGS void
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| 110 | #define VOLATILE volatile
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| 111 | #define SIGNED signed
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| 112 | #endif /* ! IN_GCC */
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| 113 |
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| 114 | #define PARAMS(paramlist) paramlist
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| 115 | #define ANSI_PROTOTYPES 1
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| 116 |
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| 117 | #define VPARAMS(ARGS) ARGS
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| 118 | #define VA_START(va_list,var) va_start(va_list,var)
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| 119 |
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| 120 | /* These are obsolete. Do not use. */
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| 121 | #ifndef IN_GCC
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| 122 | #define CONST const
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| 123 | #define DOTS , ...
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| 124 | #define PROTO(type, name, arglist) type name arglist
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| 125 | #define EXFUN(name, proto) name proto
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| 126 | #define DEFUN(name, arglist, args) name(args)
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| 127 | #define DEFUN_VOID(name) name(void)
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| 128 | #endif /* ! IN_GCC */
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| 129 |
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| 130 | #else /* Not ANSI C. */
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| 131 |
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| 132 | #define PTR char *
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| 133 | #define PTRCONST PTR
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| 134 | #define LONG_DOUBLE double
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| 135 |
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| 136 | #ifndef IN_GCC
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| 137 | #define AND ;
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| 138 | #define NOARGS
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| 139 | #define VOLATILE
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| 140 | #define SIGNED
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| 141 | #endif /* !IN_GCC */
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| 142 |
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| 143 | #ifndef const /* some systems define it in header files for non-ansi mode */
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| 144 | #define const
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| 145 | #endif
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| 146 |
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| 147 | #define PARAMS(paramlist) ()
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| 148 |
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| 149 | #define VPARAMS(ARGS) (va_alist) va_dcl
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| 150 | #define VA_START(va_list,var) va_start(va_list)
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| 151 |
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| 152 | /* These are obsolete. Do not use. */
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| 153 | #ifndef IN_GCC
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| 154 | #define CONST
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| 155 | #define DOTS
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| 156 | #define PROTO(type, name, arglist) type name ()
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| 157 | #define EXFUN(name, proto) name()
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| 158 | #define DEFUN(name, arglist, args) name arglist args;
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| 159 | #define DEFUN_VOID(name) name()
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| 160 | #endif /* ! IN_GCC */
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| 161 |
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| 162 | #endif /* ANSI C. */
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| 163 |
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| 164 |
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| 165 | /* Using MACRO(x,y) in cpp #if conditionals does not work with some
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| 166 | older preprocessors. Thus we can't define something like this:
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| 167 |
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| 168 | #define HAVE_GCC_VERSION(MAJOR, MINOR) \
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| 169 | (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
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| 170 |
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| 171 | and then test "#if HAVE_GCC_VERSION(2,7)".
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| 172 |
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| 173 | So instead we use the macro below and test it against specific values. */
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| 174 |
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| 175 | /* This macro simplifies testing whether we are using gcc, and if it
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| 176 | is of a particular minimum version. (Both major & minor numbers are
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| 177 | significant.) This macro will evaluate to 0 if we are not using
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| 178 | gcc at all. */
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| 179 | #ifndef GCC_VERSION
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| 180 | #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
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| 181 | #endif /* GCC_VERSION */
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| 182 |
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| 183 | /* Define macros for some gcc attributes. This permits us to use the
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| 184 | macros freely, and know that they will come into play for the
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| 185 | version of gcc in which they are supported. */
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| 186 |
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| 187 | #if (GCC_VERSION < 2007)
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| 188 | # define __attribute__(x)
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| 189 | #endif
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| 190 |
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| 191 | /* Attribute __malloc__ on functions was valid as of gcc 2.96. */
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| 192 | #ifndef ATTRIBUTE_MALLOC
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| 193 | # if (GCC_VERSION >= 2096)
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| 194 | # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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| 195 | # else
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| 196 | # define ATTRIBUTE_MALLOC
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| 197 | # endif /* GNUC >= 2.96 */
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| 198 | #endif /* ATTRIBUTE_MALLOC */
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| 199 |
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| 200 | /* Attributes on labels were valid as of gcc 2.93. */
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| 201 | #ifndef ATTRIBUTE_UNUSED_LABEL
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| 202 | # if (GCC_VERSION >= 2093)
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| 203 | # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
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| 204 | # else
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| 205 | # define ATTRIBUTE_UNUSED_LABEL
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| 206 | # endif /* GNUC >= 2.93 */
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| 207 | #endif /* ATTRIBUTE_UNUSED_LABEL */
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| 208 |
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| 209 | #ifndef ATTRIBUTE_UNUSED
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| 210 | #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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| 211 | #endif /* ATTRIBUTE_UNUSED */
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| 212 |
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| 213 | #ifndef ATTRIBUTE_NORETURN
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| 214 | #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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| 215 | #endif /* ATTRIBUTE_NORETURN */
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| 216 |
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| 217 | #ifndef ATTRIBUTE_PRINTF
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| 218 | #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
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| 219 | #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
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| 220 | #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
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| 221 | #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
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| 222 | #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
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| 223 | #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
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| 224 | #endif /* ATTRIBUTE_PRINTF */
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| 225 |
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| 226 | /* We use __extension__ in some places to suppress -pedantic warnings
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| 227 | about GCC extensions. This feature didn't work properly before
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| 228 | gcc 2.8. */
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| 229 | #if GCC_VERSION < 2008
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| 230 | #define __extension__
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| 231 | #endif
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| 232 |
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| 233 | #endif /* ansidecl.h */
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