1 /* 2 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 * 9 * $Id: cdefs.h,v 1.14 2001/06/07 20:04:53 ca Exp $ 10 */ 11 12 /* 13 ** libsm C language portability macros 14 ** See libsm/cdefs.html for documentation. 15 */ 16 17 #ifndef SM_CDEFS_H 18 # define SM_CDEFS_H 19 20 # include <sm/config.h> 21 22 /* 23 ** BSD and Linux have <sys/cdefs.h> which defines a set of C language 24 ** portability macros that are a defacto standard in the open source 25 ** community. 26 */ 27 28 # if SM_CONF_SYS_CDEFS_H 29 # include <sys/cdefs.h> 30 # endif /* SM_CONF_SYS_CDEFS_H */ 31 32 /* 33 ** Define the standard C language portability macros 34 ** for platforms that lack <sys/cdefs.h>. 35 */ 36 37 # if !SM_CONF_SYS_CDEFS_H 38 # if defined(__cplusplus) 39 # define __BEGIN_DECLS extern "C" { 40 # define __END_DECLS }; 41 # else /* defined(__cplusplus) */ 42 # define __BEGIN_DECLS 43 # define __END_DECLS 44 # endif /* defined(__cplusplus) */ 45 # if defined(__STDC__) || defined(__cplusplus) 46 # define __P(protos) protos 47 # define __CONCAT(x,y) x ## y 48 # define __STRING(x) #x 49 # else /* defined(__STDC__) || defined(__cplusplus) */ 50 # define __P(protos) () 51 # define __CONCAT(x,y) x/**/y 52 # define __STRING(x) "x" 53 # define const 54 # define signed 55 # define volatile 56 # endif /* defined(__STDC__) || defined(__cplusplus) */ 57 # endif /* !SM_CONF_SYS_CDEFS_H */ 58 59 /* 60 ** Define SM_DEAD, a macro used to declare functions that do not return 61 ** to their caller. 62 */ 63 64 # ifndef SM_DEAD 65 # if __GNUC__ >= 2 66 # if __GNUC__ == 2 && __GNUC_MINOR__ < 5 67 # define SM_DEAD(proto) volatile proto 68 # else /* __GNUC__ == 2 && __GNUC_MINOR__ < 5 */ 69 # define SM_DEAD(proto) proto __attribute__((__noreturn__)) 70 # endif /* __GNUC__ == 2 && __GNUC_MINOR__ < 5 */ 71 # else /* __GNUC__ >= 2 */ 72 # define SM_DEAD(proto) proto 73 # endif /* __GNUC__ >= 2 */ 74 # endif /* SM_DEAD */ 75 76 /* 77 ** Define SM_UNUSED, a macro used to declare variables that may be unused. 78 */ 79 80 # ifndef SM_UNUSED 81 # if __GNUC__ >= 2 82 # if __GNUC__ == 2 && __GNUC_MINOR__ < 7 83 # define SM_UNUSED(decl) decl 84 # else /* __GNUC__ == 2 && __GNUC_MINOR__ < 7 */ 85 # define SM_UNUSED(decl) decl __attribute__((__unused__)) 86 # endif /* __GNUC__ == 2 && __GNUC_MINOR__ < 7 */ 87 # else /* __GNUC__ >= 2 */ 88 # define SM_UNUSED(decl) decl 89 # endif /* __GNUC__ >= 2 */ 90 # endif /* SM_UNUSED */ 91 92 /* 93 ** The SM_NONVOLATILE macro is used to declare variables that are not 94 ** volatile, but which must be declared volatile when compiling with 95 ** gcc -O -Wall in order to suppress bogus warning messages. 96 ** 97 ** Variables that actually are volatile should be declared volatile 98 ** using the "volatile" keyword. If a variable actually is volatile, 99 ** then SM_NONVOLATILE should not be used. 100 ** 101 ** To compile sendmail with gcc and see all non-bogus warnings, 102 ** you should use 103 ** gcc -O -Wall -DSM_OMIT_BOGUS_WARNINGS ... 104 ** Do not use -DSM_OMIT_BOGUS_WARNINGS when compiling the production 105 ** version of sendmail, because there is a performance hit. 106 */ 107 108 # ifdef SM_OMIT_BOGUS_WARNINGS 109 # define SM_NONVOLATILE volatile 110 # else /* SM_OMIT_BOGUS_WARNINGS */ 111 # define SM_NONVOLATILE 112 # endif /* SM_OMIT_BOGUS_WARNINGS */ 113 114 /* 115 ** Turn on format string argument checking. 116 */ 117 118 # ifndef SM_CONF_FORMAT_TEST 119 # if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 120 # define SM_CONF_FORMAT_TEST 1 121 # else /* __GNUC__ == 2 && __GNUC_MINOR__ >= 7 */ 122 # define SM_CONF_FORMAT_TEST 0 123 # endif /* __GNUC__ == 2 && __GNUC_MINOR__ >= 7 */ 124 # endif /* SM_CONF_FORMAT_TEST */ 125 126 # ifndef PRINTFLIKE 127 # if SM_CONF_FORMAT_TEST 128 # define PRINTFLIKE(x,y) __attribute__ ((__format__ (__printf__, x, y))) 129 # else /* SM_CONF_FORMAT_TEST */ 130 # define PRINTFLIKE(x,y) 131 # endif /* SM_CONF_FORMAT_TEST */ 132 # endif /* ! PRINTFLIKE */ 133 134 # ifndef SCANFLIKE 135 # if SM_CONF_FORMAT_TEST 136 # define SCANFLIKE(x,y) __attribute__ ((__format__ (__scanf__, x, y))) 137 # else /* SM_CONF_FORMAT_TEST */ 138 # define SCANFLIKE(x,y) 139 # endif /* SM_CONF_FORMAT_TEST */ 140 # endif /* ! SCANFLIKE */ 141 142 #endif /* ! SM_CDEFS_H */ 143