1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_FEATURE_TESTS_H 28 #define _SYS_FEATURE_TESTS_H 29 30 #include <sys/ccompile.h> 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 /* 37 * Values of _POSIX_C_SOURCE 38 * 39 * undefined not a POSIX compilation 40 * 1 POSIX.1-1990 compilation 41 * 2 POSIX.2-1992 compilation 42 * 199309L POSIX.1b-1993 compilation (Real Time) 43 * 199506L POSIX.1c-1995 compilation (POSIX Threads) 44 * 200112L POSIX.1-2001 compilation (Austin Group Revision) 45 */ 46 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 47 #define _POSIX_C_SOURCE 1 48 #endif 49 50 /* 51 * The feature test macros __XOPEN_OR_POSIX, _STRICT_STDC, and _STDC_C99 52 * are Sun implementation specific macros created in order to compress 53 * common standards specified feature test macros for easier reading. 54 * These macros should not be used by the application developer as 55 * unexpected results may occur. Instead, the user should reference 56 * standards(5) for correct usage of the standards feature test macros. 57 * 58 * __XOPEN_OR_POSIX Used in cases where a symbol is defined by both 59 * X/Open or POSIX or in the negative, when neither 60 * X/Open or POSIX defines a symbol. 61 * 62 * _STRICT_STDC __STDC__ is specified by the C Standards and defined 63 * by the compiler. For Sun compilers the value of 64 * __STDC__ is either 1, 0, or not defined based on the 65 * compilation mode (see cc(1)). When the value of 66 * __STDC__ is 1 and in the absence of any other feature 67 * test macros, the namespace available to the application 68 * is limited to only those symbols defined by the C 69 * Standard. _STRICT_STDC provides a more readable means 70 * of identifying symbols defined by the standard, or in 71 * the negative, symbols that are extensions to the C 72 * Standard. See additional comments for GNU C differences. 73 * 74 * _STDC_C99 __STDC_VERSION__ is specified by the C standards and 75 * defined by the compiler and indicates the version of 76 * the C standard. A value of 199901L indicates a 77 * compiler that complies with ISO/IEC 9899:1999, other- 78 * wise known as the C99 standard. 79 */ 80 81 #if defined(_XOPEN_SOURCE) || defined(_POSIX_C_SOURCE) 82 #define __XOPEN_OR_POSIX 83 #endif 84 85 /* 86 * ISO/IEC 9899:1990 and it's revision, ISO/IEC 9899:1999 specify the 87 * following predefined macro name: 88 * 89 * __STDC__ The integer constant 1, intended to indicate a conforming 90 * implementation. 91 * 92 * Furthermore, a strictly conforming program shall use only those features 93 * of the language and library specified in these standards. A conforming 94 * implementation shall accept any strictly conforming program. 95 * 96 * Based on these requirements, Sun's C compiler defines __STDC__ to 1 for 97 * strictly conforming environments and __STDC__ to 0 for environments that 98 * use ANSI C semantics but allow extensions to the C standard. For non-ANSI 99 * C semantics, Sun's C compiler does not define __STDC__. 100 * 101 * The GNU C project interpretation is that __STDC__ should always be defined 102 * to 1 for compilation modes that accept ANSI C syntax regardless of whether 103 * or not extensions to the C standard are used. Violations of conforming 104 * behavior are conditionally flagged as warnings via the use of the 105 * -pedantic option. In addition to defining __STDC__ to 1, the GNU C 106 * compiler also defines __STRICT_ANSI__ as a means of specifying strictly 107 * conforming environments using the -ansi or -std=<standard> options. 108 * 109 * In the absence of any other compiler options, Sun and GNU set the value 110 * of __STDC__ as follows when using the following options: 111 * 112 * Value of __STDC__ __STRICT_ANSI__ 113 * 114 * cc -Xa (default) 0 undefined 115 * cc -Xt (transitional) 0 undefined 116 * cc -Xc (strictly conforming) 1 undefined 117 * cc -Xs (K&R C) undefined undefined 118 * 119 * gcc (default) 1 undefined 120 * gcc -ansi, -std={c89, c99,...) 1 defined 121 * gcc -traditional (K&R) undefined undefined 122 * 123 * The default compilation modes for Sun C compilers versus GNU C compilers 124 * results in a differing value for __STDC__ which results in a more 125 * restricted namespace when using Sun compilers. To allow both GNU and Sun 126 * interpretations to peacefully co-exist, we use the following Sun 127 * implementation _STRICT_STDC_ macro: 128 */ 129 130 #if (__STDC__ - 0 == 1 && !defined(__GNUC__)) || \ 131 (defined(__GNUC__) && defined(__STRICT_ANSI__)) 132 #define _STRICT_STDC 133 #else 134 #undef _STRICT_STDC 135 #endif 136 137 /* 138 * Compiler complies with ISO/IEC 9899:1999 139 */ 140 141 #if __STDC_VERSION__ - 0 >= 199901L 142 #ifndef _STDC_C99 143 #define _STDC_C99 144 #endif 145 #endif 146 147 /* 148 * Large file interfaces: 149 * 150 * _LARGEFILE_SOURCE 151 * 1 large file-related additions to POSIX 152 * interfaces requested (fseeko, etc.) 153 * _LARGEFILE64_SOURCE 154 * 1 transitional large-file-related interfaces 155 * requested (seek64, stat64, etc.) 156 * 157 * The corresponding announcement macros are respectively: 158 * _LFS_LARGEFILE 159 * _LFS64_LARGEFILE 160 * (These are set in <unistd.h>.) 161 * 162 * Requesting _LARGEFILE64_SOURCE implies requesting _LARGEFILE_SOURCE as 163 * well. 164 * 165 * The large file interfaces are made visible regardless of the initial values 166 * of the feature test macros under certain circumstances: 167 * - If no explicit standards-conforming environment is requested (neither 168 * of _POSIX_SOURCE nor _XOPEN_SOURCE is defined and the value of 169 * __STDC__ does not imply standards conformance). 170 * - Extended system interfaces are explicitly requested (__EXTENSIONS__ 171 * is defined). 172 * - Access to in-kernel interfaces is requested (_KERNEL or _KMEMUSER is 173 * defined). (Note that this dependency is an artifact of the current 174 * kernel implementation and may change in future releases.) 175 */ 176 #if (!defined(_STRICT_STDC) && !defined(__XOPEN_OR_POSIX)) || \ 177 defined(_KERNEL) || defined(_KMEMUSER) || \ 178 defined(__EXTENSIONS__) 179 #undef _LARGEFILE64_SOURCE 180 #define _LARGEFILE64_SOURCE 1 181 #endif 182 #if _LARGEFILE64_SOURCE - 0 == 1 183 #undef _LARGEFILE_SOURCE 184 #define _LARGEFILE_SOURCE 1 185 #endif 186 187 /* 188 * Large file compilation environment control: 189 * 190 * The setting of _FILE_OFFSET_BITS controls the size of various file-related 191 * types and governs the mapping between file-related source function symbol 192 * names and the corresponding binary entry points. 193 * 194 * In the 32-bit environment, the default value is 32; if not set, set it to 195 * the default here, to simplify tests in other headers. 196 * 197 * In the 64-bit compilation environment, the only value allowed is 64. 198 */ 199 #if defined(_LP64) 200 #ifndef _FILE_OFFSET_BITS 201 #define _FILE_OFFSET_BITS 64 202 #endif 203 #if _FILE_OFFSET_BITS - 0 != 64 204 #error "invalid _FILE_OFFSET_BITS value specified" 205 #endif 206 #else /* _LP64 */ 207 #ifndef _FILE_OFFSET_BITS 208 #define _FILE_OFFSET_BITS 32 209 #endif 210 #if _FILE_OFFSET_BITS - 0 != 32 && _FILE_OFFSET_BITS - 0 != 64 211 #error "invalid _FILE_OFFSET_BITS value specified" 212 #endif 213 #endif /* _LP64 */ 214 215 /* 216 * Use of _XOPEN_SOURCE 217 * 218 * The following X/Open specifications are supported: 219 * 220 * X/Open Portability Guide, Issue 3 (XPG3) 221 * X/Open CAE Specification, Issue 4 (XPG4) 222 * X/Open CAE Specification, Issue 4, Version 2 (XPG4v2) 223 * X/Open CAE Specification, Issue 5 (XPG5) 224 * Open Group Technical Standard, Issue 6 (XPG6), also referred to as 225 * IEEE Std. 1003.1-2001 and ISO/IEC 9945:2002. 226 * 227 * XPG4v2 is also referred to as UNIX 95 (SUS or SUSv1). 228 * XPG5 is also referred to as UNIX 98 or the Single Unix Specification, 229 * Version 2 (SUSv2) 230 * XPG6 is the result of a merge of the X/Open and POSIX specifications 231 * and as such is also referred to as IEEE Std. 1003.1-2001 in 232 * addition to UNIX 03 and SUSv3. 233 * 234 * When writing a conforming X/Open application, as per the specification 235 * requirements, the appropriate feature test macros must be defined at 236 * compile time. These are as follows. For more info, see standards(5). 237 * 238 * Feature Test Macro Specification 239 * ------------------------------------------------ ------------- 240 * _XOPEN_SOURCE XPG3 241 * _XOPEN_SOURCE && _XOPEN_VERSION = 4 XPG4 242 * _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED = 1 XPG4v2 243 * _XOPEN_SOURCE = 500 XPG5 244 * _XOPEN_SOURCE = 600 (or POSIX_C_SOURCE=200112L) XPG6 245 * 246 * In order to simplify the guards within the headers, the following 247 * implementation private test macros have been created. Applications 248 * must NOT use these private test macros as unexpected results will 249 * occur. 250 * 251 * Note that in general, the use of these private macros is cumulative. 252 * For example, the use of _XPG3 with no other restrictions on the X/Open 253 * namespace will make the symbols visible for XPG3 through XPG6 254 * compilation environments. The use of _XPG4_2 with no other X/Open 255 * namespace restrictions indicates that the symbols were introduced in 256 * XPG4v2 and are therefore visible for XPG4v2 through XPG6 compilation 257 * environments, but not for XPG3 or XPG4 compilation environments. 258 * 259 * _XPG3 X/Open Portability Guide, Issue 3 (XPG3) 260 * _XPG4 X/Open CAE Specification, Issue 4 (XPG4) 261 * _XPG4_2 X/Open CAE Specification, Issue 4, Version 2 (XPG4v2/UNIX 95/SUS) 262 * _XPG5 X/Open CAE Specification, Issue 5 (XPG5/UNIX 98/SUSv2) 263 * _XPG6 Open Group Technical Standard, Issue 6 (XPG6/UNIX 03/SUSv3) 264 */ 265 266 /* X/Open Portability Guide, Issue 3 */ 267 #if defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE - 0 < 500) && \ 268 (_XOPEN_VERSION - 0 < 4) && !defined(_XOPEN_SOURCE_EXTENDED) 269 #define _XPG3 270 /* X/Open CAE Specification, Issue 4 */ 271 #elif (defined(_XOPEN_SOURCE) && _XOPEN_VERSION - 0 == 4) 272 #define _XPG4 273 #define _XPG3 274 /* X/Open CAE Specification, Issue 4, Version 2 */ 275 #elif (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE_EXTENDED - 0 == 1) 276 #define _XPG4_2 277 #define _XPG4 278 #define _XPG3 279 /* X/Open CAE Specification, Issue 5 */ 280 #elif (_XOPEN_SOURCE - 0 == 500) 281 #define _XPG5 282 #define _XPG4_2 283 #define _XPG4 284 #define _XPG3 285 #undef _POSIX_C_SOURCE 286 #define _POSIX_C_SOURCE 199506L 287 /* Open Group Technical Standard , Issue 6 */ 288 #elif (_XOPEN_SOURCE - 0 == 600) || (_POSIX_C_SOURCE - 0 == 200112L) 289 #define _XPG6 290 #define _XPG5 291 #define _XPG4_2 292 #define _XPG4 293 #define _XPG3 294 #undef _POSIX_C_SOURCE 295 #define _POSIX_C_SOURCE 200112L 296 #undef _XOPEN_SOURCE 297 #define _XOPEN_SOURCE 600 298 #endif 299 300 /* 301 * _XOPEN_VERSION is defined by the X/Open specifications and is not 302 * normally defined by the application, except in the case of an XPG4 303 * application. On the implementation side, _XOPEN_VERSION defined with 304 * the value of 3 indicates an XPG3 application. _XOPEN_VERSION defined 305 * with the value of 4 indicates an XPG4 or XPG4v2 (UNIX 95) application. 306 * _XOPEN_VERSION defined with a value of 500 indicates an XPG5 (UNIX 98) 307 * application and with a value of 600 indicates an XPG6 (UNIX 03) 308 * application. The appropriate version is determined by the use of the 309 * feature test macros described earlier. The value of _XOPEN_VERSION 310 * defaults to 3 otherwise indicating support for XPG3 applications. 311 */ 312 #ifndef _XOPEN_VERSION 313 #ifdef _XPG6 314 #define _XOPEN_VERSION 600 315 #elif defined(_XPG5) 316 #define _XOPEN_VERSION 500 317 #elif defined(_XPG4_2) 318 #define _XOPEN_VERSION 4 319 #else 320 #define _XOPEN_VERSION 3 321 #endif 322 #endif 323 324 /* 325 * ANSI C and ISO 9899:1990 say the type long long doesn't exist in strictly 326 * conforming environments. ISO 9899:1999 says it does. 327 * 328 * The presence of _LONGLONG_TYPE says "long long exists" which is therefore 329 * defined in all but strictly conforming environments that disallow it. 330 */ 331 #if !defined(_STDC_C99) && defined(_STRICT_STDC) && !defined(__GNUC__) 332 /* 333 * Resist attempts to force the definition of long long in this case. 334 */ 335 #if defined(_LONGLONG_TYPE) 336 #error "No long long in strictly conforming ANSI C & 1990 ISO C environments" 337 #endif 338 #else 339 #if !defined(_LONGLONG_TYPE) 340 #define _LONGLONG_TYPE 341 #endif 342 #endif 343 344 /* 345 * It is invalid to compile an XPG3, XPG4, XPG4v2, or XPG5 application 346 * using c99. The same is true for POSIX.1-1990, POSIX.2-1992, POSIX.1b, 347 * and POSIX.1c applications. Likewise, it is invalid to compile an XPG6 348 * or a POSIX.1-2001 application with anything other than a c99 or later 349 * compiler. Therefore, we force an error in both cases. 350 */ 351 #if defined(_STDC_C99) && (defined(__XOPEN_OR_POSIX) && !defined(_XPG6)) 352 #error "Compiler or options invalid for pre-UNIX 03 X/Open applications \ 353 and pre-2001 POSIX applications" 354 #elif !defined(_STDC_C99) && \ 355 (defined(__XOPEN_OR_POSIX) && defined(_XPG6)) 356 #error "Compiler or options invalid; UNIX 03 and POSIX.1-2001 applications \ 357 require the use of c99" 358 #endif 359 360 /* 361 * The following macro defines a value for the ISO C99 restrict 362 * keyword so that _RESTRICT_KYWD resolves to "restrict" if 363 * an ISO C99 compiler is used and "" (null string) if any other 364 * compiler is used. This allows for the use of single prototype 365 * declarations regardless of compiler version. 366 */ 367 #if (defined(__STDC__) && defined(_STDC_C99)) && !defined(__cplusplus) 368 #define _RESTRICT_KYWD restrict 369 #else 370 #define _RESTRICT_KYWD 371 #endif 372 373 /* 374 * The following macro indicates header support for the ANSI C++ 375 * standard. The ISO/IEC designation for this is ISO/IEC FDIS 14882. 376 */ 377 #define _ISO_CPP_14882_1998 378 379 /* 380 * The following macro indicates header support for the C99 standard, 381 * ISO/IEC 9899:1999, Programming Languages - C. 382 */ 383 #define _ISO_C_9899_1999 384 385 /* 386 * The following macro indicates header support for DTrace. The value is an 387 * integer that corresponds to the major version number for DTrace. 388 */ 389 #define _DTRACE_VERSION 1 390 391 #ifdef __cplusplus 392 } 393 #endif 394 395 #endif /* _SYS_FEATURE_TESTS_H */ 396