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 2013 Garrett D'Amore <garrett@damore.org> 24 * 25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #ifndef _SYS_FEATURE_TESTS_H 30 #define _SYS_FEATURE_TESTS_H 31 32 #include <sys/ccompile.h> 33 #include <sys/isa_defs.h> 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 /* 40 * Values of _POSIX_C_SOURCE 41 * 42 * undefined not a POSIX compilation 43 * 1 POSIX.1-1990 compilation 44 * 2 POSIX.2-1992 compilation 45 * 199309L POSIX.1b-1993 compilation (Real Time) 46 * 199506L POSIX.1c-1995 compilation (POSIX Threads) 47 * 200112L POSIX.1-2001 compilation (Austin Group Revision) 48 * 200809L POSIX.1-2008 compilation 49 */ 50 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 51 #define _POSIX_C_SOURCE 1 52 #endif 53 54 /* 55 * The feature test macros __XOPEN_OR_POSIX, _STRICT_STDC, _STRICT_SYMBOLS, 56 * and _STDC_C99 are Sun implementation specific macros created in order to 57 * compress common standards specified feature test macros for easier reading. 58 * These macros should not be used by the application developer as 59 * unexpected results may occur. Instead, the user should reference 60 * standards(5) for correct usage of the standards feature test macros. 61 * 62 * __XOPEN_OR_POSIX Used in cases where a symbol is defined by both 63 * X/Open or POSIX or in the negative, when neither 64 * X/Open or POSIX defines a symbol. 65 * 66 * _STRICT_STDC __STDC__ is specified by the C Standards and defined 67 * by the compiler. For Sun compilers the value of 68 * __STDC__ is either 1, 0, or not defined based on the 69 * compilation mode (see cc(1)). When the value of 70 * __STDC__ is 1 and in the absence of any other feature 71 * test macros, the namespace available to the application 72 * is limited to only those symbols defined by the C 73 * Standard. _STRICT_STDC provides a more readable means 74 * of identifying symbols defined by the standard, or in 75 * the negative, symbols that are extensions to the C 76 * Standard. See additional comments for GNU C differences. 77 * 78 * _STDC_C99 __STDC_VERSION__ is specified by the C standards and 79 * defined by the compiler and indicates the version of 80 * the C standard. A value of 199901L indicates a 81 * compiler that complies with ISO/IEC 9899:1999, other- 82 * wise known as the C99 standard. 83 * 84 * _STRICT_SYMBOLS Used in cases where symbol visibility is restricted 85 * by the standards, and the user has not explicitly 86 * relaxed the strictness via __EXTENSIONS__. 87 */ 88 89 #if defined(_XOPEN_SOURCE) || defined(_POSIX_C_SOURCE) 90 #define __XOPEN_OR_POSIX 91 #endif 92 93 /* 94 * ISO/IEC 9899:1990 and it's revision, ISO/IEC 9899:1999 specify the 95 * following predefined macro name: 96 * 97 * __STDC__ The integer constant 1, intended to indicate a conforming 98 * implementation. 99 * 100 * Furthermore, a strictly conforming program shall use only those features 101 * of the language and library specified in these standards. A conforming 102 * implementation shall accept any strictly conforming program. 103 * 104 * Based on these requirements, Sun's C compiler defines __STDC__ to 1 for 105 * strictly conforming environments and __STDC__ to 0 for environments that 106 * use ANSI C semantics but allow extensions to the C standard. For non-ANSI 107 * C semantics, Sun's C compiler does not define __STDC__. 108 * 109 * The GNU C project interpretation is that __STDC__ should always be defined 110 * to 1 for compilation modes that accept ANSI C syntax regardless of whether 111 * or not extensions to the C standard are used. Violations of conforming 112 * behavior are conditionally flagged as warnings via the use of the 113 * -pedantic option. In addition to defining __STDC__ to 1, the GNU C 114 * compiler also defines __STRICT_ANSI__ as a means of specifying strictly 115 * conforming environments using the -ansi or -std=<standard> options. 116 * 117 * In the absence of any other compiler options, Sun and GNU set the value 118 * of __STDC__ as follows when using the following options: 119 * 120 * Value of __STDC__ __STRICT_ANSI__ 121 * 122 * cc -Xa (default) 0 undefined 123 * cc -Xt (transitional) 0 undefined 124 * cc -Xc (strictly conforming) 1 undefined 125 * cc -Xs (K&R C) undefined undefined 126 * 127 * gcc (default) 1 undefined 128 * gcc -ansi, -std={c89, c99,...) 1 defined 129 * gcc -traditional (K&R) undefined undefined 130 * 131 * The default compilation modes for Sun C compilers versus GNU C compilers 132 * results in a differing value for __STDC__ which results in a more 133 * restricted namespace when using Sun compilers. To allow both GNU and Sun 134 * interpretations to peacefully co-exist, we use the following Sun 135 * implementation _STRICT_STDC_ macro: 136 */ 137 138 #if (__STDC__ - 0 == 1 && !defined(__GNUC__)) || \ 139 (defined(__GNUC__) && defined(__STRICT_ANSI__)) 140 #define _STRICT_STDC 141 #else 142 #undef _STRICT_STDC 143 #endif 144 145 /* 146 * Compiler complies with ISO/IEC 9899:1999 147 */ 148 149 #if __STDC_VERSION__ - 0 >= 199901L 150 #define _STDC_C99 151 #endif 152 153 /* 154 * Use strict symbol visibility. 155 */ 156 #if (defined(_STRICT_STDC) || defined(__XOPEN_OR_POSIX)) && \ 157 !defined(__EXTENSIONS__) 158 #define _STRICT_SYMBOLS 159 #endif 160 161 /* 162 * Large file interfaces: 163 * 164 * _LARGEFILE_SOURCE 165 * 1 large file-related additions to POSIX 166 * interfaces requested (fseeko, etc.) 167 * _LARGEFILE64_SOURCE 168 * 1 transitional large-file-related interfaces 169 * requested (seek64, stat64, etc.) 170 * 171 * The corresponding announcement macros are respectively: 172 * _LFS_LARGEFILE 173 * _LFS64_LARGEFILE 174 * (These are set in <unistd.h>.) 175 * 176 * Requesting _LARGEFILE64_SOURCE implies requesting _LARGEFILE_SOURCE as 177 * well. 178 * 179 * The large file interfaces are made visible regardless of the initial values 180 * of the feature test macros under certain circumstances: 181 * - If no explicit standards-conforming environment is requested (neither 182 * of _POSIX_SOURCE nor _XOPEN_SOURCE is defined and the value of 183 * __STDC__ does not imply standards conformance). 184 * - Extended system interfaces are explicitly requested (__EXTENSIONS__ 185 * is defined). 186 * - Access to in-kernel interfaces is requested (_KERNEL or _KMEMUSER is 187 * defined). (Note that this dependency is an artifact of the current 188 * kernel implementation and may change in future releases.) 189 */ 190 #if (!defined(_STRICT_STDC) && !defined(__XOPEN_OR_POSIX)) || \ 191 defined(_KERNEL) || defined(_KMEMUSER) || \ 192 defined(__EXTENSIONS__) 193 #undef _LARGEFILE64_SOURCE 194 #define _LARGEFILE64_SOURCE 1 195 #endif 196 #if _LARGEFILE64_SOURCE - 0 == 1 197 #undef _LARGEFILE_SOURCE 198 #define _LARGEFILE_SOURCE 1 199 #endif 200 201 /* 202 * Large file compilation environment control: 203 * 204 * The setting of _FILE_OFFSET_BITS controls the size of various file-related 205 * types and governs the mapping between file-related source function symbol 206 * names and the corresponding binary entry points. 207 * 208 * In the 32-bit environment, the default value is 32; if not set, set it to 209 * the default here, to simplify tests in other headers. 210 * 211 * In the 64-bit compilation environment, the only value allowed is 64. 212 */ 213 #if defined(_LP64) 214 #ifndef _FILE_OFFSET_BITS 215 #define _FILE_OFFSET_BITS 64 216 #endif 217 #if _FILE_OFFSET_BITS - 0 != 64 218 #error "invalid _FILE_OFFSET_BITS value specified" 219 #endif 220 #else /* _LP64 */ 221 #ifndef _FILE_OFFSET_BITS 222 #define _FILE_OFFSET_BITS 32 223 #endif 224 #if _FILE_OFFSET_BITS - 0 != 32 && _FILE_OFFSET_BITS - 0 != 64 225 #error "invalid _FILE_OFFSET_BITS value specified" 226 #endif 227 #endif /* _LP64 */ 228 229 /* 230 * Use of _XOPEN_SOURCE 231 * 232 * The following X/Open specifications are supported: 233 * 234 * X/Open Portability Guide, Issue 3 (XPG3) 235 * X/Open CAE Specification, Issue 4 (XPG4) 236 * X/Open CAE Specification, Issue 4, Version 2 (XPG4v2) 237 * X/Open CAE Specification, Issue 5 (XPG5) 238 * Open Group Technical Standard, Issue 6 (XPG6), also referred to as 239 * IEEE Std. 1003.1-2001 and ISO/IEC 9945:2002. 240 * Open Group Technical Standard, Issue 7 (XPG7), also referred to as 241 * IEEE Std. 1003.1-2008 and ISO/IEC 9945:2009. 242 * 243 * XPG4v2 is also referred to as UNIX 95 (SUS or SUSv1). 244 * XPG5 is also referred to as UNIX 98 or the Single Unix Specification, 245 * Version 2 (SUSv2) 246 * XPG6 is the result of a merge of the X/Open and POSIX specifications 247 * and as such is also referred to as IEEE Std. 1003.1-2001 in 248 * addition to UNIX 03 and SUSv3. 249 * XPG7 is also referred to as UNIX 08 and SUSv4. 250 * 251 * When writing a conforming X/Open application, as per the specification 252 * requirements, the appropriate feature test macros must be defined at 253 * compile time. These are as follows. For more info, see standards(5). 254 * 255 * Feature Test Macro Specification 256 * ------------------------------------------------ ------------- 257 * _XOPEN_SOURCE XPG3 258 * _XOPEN_SOURCE && _XOPEN_VERSION = 4 XPG4 259 * _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED = 1 XPG4v2 260 * _XOPEN_SOURCE = 500 XPG5 261 * _XOPEN_SOURCE = 600 (or POSIX_C_SOURCE=200112L) XPG6 262 * _XOPEN_SOURCE = 700 (or POSIX_C_SOURCE=200809L) XPG7 263 * 264 * In order to simplify the guards within the headers, the following 265 * implementation private test macros have been created. Applications 266 * must NOT use these private test macros as unexpected results will 267 * occur. 268 * 269 * Note that in general, the use of these private macros is cumulative. 270 * For example, the use of _XPG3 with no other restrictions on the X/Open 271 * namespace will make the symbols visible for XPG3 through XPG6 272 * compilation environments. The use of _XPG4_2 with no other X/Open 273 * namespace restrictions indicates that the symbols were introduced in 274 * XPG4v2 and are therefore visible for XPG4v2 through XPG6 compilation 275 * environments, but not for XPG3 or XPG4 compilation environments. 276 * 277 * _XPG3 X/Open Portability Guide, Issue 3 (XPG3) 278 * _XPG4 X/Open CAE Specification, Issue 4 (XPG4) 279 * _XPG4_2 X/Open CAE Specification, Issue 4, Version 2 (XPG4v2/UNIX 95/SUS) 280 * _XPG5 X/Open CAE Specification, Issue 5 (XPG5/UNIX 98/SUSv2) 281 * _XPG6 Open Group Technical Standard, Issue 6 (XPG6/UNIX 03/SUSv3) 282 * _XPG7 Open Group Technical Standard, Issue 7 (XPG7/UNIX 08/SUSv4) 283 */ 284 285 /* X/Open Portability Guide, Issue 3 */ 286 #if defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE - 0 < 500) && \ 287 (_XOPEN_VERSION - 0 < 4) && !defined(_XOPEN_SOURCE_EXTENDED) 288 #define _XPG3 289 /* X/Open CAE Specification, Issue 4 */ 290 #elif (defined(_XOPEN_SOURCE) && _XOPEN_VERSION - 0 == 4) 291 #define _XPG4 292 #define _XPG3 293 /* X/Open CAE Specification, Issue 4, Version 2 */ 294 #elif (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE_EXTENDED - 0 == 1) 295 #define _XPG4_2 296 #define _XPG4 297 #define _XPG3 298 /* X/Open CAE Specification, Issue 5 */ 299 #elif (_XOPEN_SOURCE - 0 == 500) 300 #define _XPG5 301 #define _XPG4_2 302 #define _XPG4 303 #define _XPG3 304 #undef _POSIX_C_SOURCE 305 #define _POSIX_C_SOURCE 199506L 306 /* Open Group Technical Standard , Issue 6 */ 307 #elif (_XOPEN_SOURCE - 0 == 600) || (_POSIX_C_SOURCE - 0 == 200112L) 308 #define _XPG6 309 #define _XPG5 310 #define _XPG4_2 311 #define _XPG4 312 #define _XPG3 313 #undef _POSIX_C_SOURCE 314 #define _POSIX_C_SOURCE 200112L 315 #undef _XOPEN_SOURCE 316 #define _XOPEN_SOURCE 600 317 318 /* Open Group Technical Standard, Issue 7 */ 319 #elif (_XOPEN_SOURCE - 0 == 700) || (_POSIX_C_SOURCE - 0 == 200809L) 320 #define _XPG7 321 #define _XPG6 322 #define _XPG5 323 #define _XPG4_2 324 #define _XPG4 325 #define _XPG3 326 #undef _POSIX_C_SOURCE 327 #define _POSIX_C_SOURCE 200809L 328 #undef _XOPEN_SOURCE 329 #define _XOPEN_SOURCE 700 330 #endif 331 332 /* 333 * _XOPEN_VERSION is defined by the X/Open specifications and is not 334 * normally defined by the application, except in the case of an XPG4 335 * application. On the implementation side, _XOPEN_VERSION defined with 336 * the value of 3 indicates an XPG3 application. _XOPEN_VERSION defined 337 * with the value of 4 indicates an XPG4 or XPG4v2 (UNIX 95) application. 338 * _XOPEN_VERSION defined with a value of 500 indicates an XPG5 (UNIX 98) 339 * application and with a value of 600 indicates an XPG6 (UNIX 03) 340 * application and with a value of 700 indicates an XPG7 (UNIX 08). 341 * The appropriate version is determined by the use of the 342 * feature test macros described earlier. The value of _XOPEN_VERSION 343 * defaults to 3 otherwise indicating support for XPG3 applications. 344 */ 345 #ifndef _XOPEN_VERSION 346 #if defined(_XPG7) 347 #define _XOPEN_VERSION 700 348 #elif defined(_XPG6) 349 #define _XOPEN_VERSION 600 350 #elif defined(_XPG5) 351 #define _XOPEN_VERSION 500 352 #elif defined(_XPG4_2) 353 #define _XOPEN_VERSION 4 354 #else 355 #define _XOPEN_VERSION 3 356 #endif 357 #endif 358 359 /* 360 * ANSI C and ISO 9899:1990 say the type long long doesn't exist in strictly 361 * conforming environments. ISO 9899:1999 says it does. 362 * 363 * The presence of _LONGLONG_TYPE says "long long exists" which is therefore 364 * defined in all but strictly conforming environments that disallow it. 365 */ 366 #if !defined(_STDC_C99) && defined(_STRICT_STDC) && !defined(__GNUC__) 367 /* 368 * Resist attempts to force the definition of long long in this case. 369 */ 370 #if defined(_LONGLONG_TYPE) 371 #error "No long long in strictly conforming ANSI C & 1990 ISO C environments" 372 #endif 373 #else 374 #if !defined(_LONGLONG_TYPE) 375 #define _LONGLONG_TYPE 376 #endif 377 #endif 378 379 /* 380 * It is invalid to compile an XPG3, XPG4, XPG4v2, or XPG5 application 381 * using c99. The same is true for POSIX.1-1990, POSIX.2-1992, POSIX.1b, 382 * and POSIX.1c applications. Likewise, it is invalid to compile an XPG6 383 * or a POSIX.1-2001 application with anything other than a c99 or later 384 * compiler. Therefore, we force an error in both cases. 385 */ 386 #if defined(_STDC_C99) && (defined(__XOPEN_OR_POSIX) && !defined(_XPG6)) 387 #error "Compiler or options invalid for pre-UNIX 03 X/Open applications \ 388 and pre-2001 POSIX applications" 389 #elif !defined(_STDC_C99) && \ 390 (defined(__XOPEN_OR_POSIX) && defined(_XPG6)) 391 #error "Compiler or options invalid; UNIX 03 and POSIX.1-2001 applications \ 392 require the use of c99" 393 #endif 394 395 /* 396 * The following macro defines a value for the ISO C99 restrict 397 * keyword so that _RESTRICT_KYWD resolves to "restrict" if 398 * an ISO C99 compiler is used, "__restrict" for c++ and "" (null string) 399 * if any other compiler is used. This allows for the use of single 400 * prototype declarations regardless of compiler version. 401 */ 402 #if (defined(__STDC__) && defined(_STDC_C99)) 403 #ifdef __cplusplus 404 #define _RESTRICT_KYWD __restrict 405 #else 406 /* 407 * NOTE: The whitespace between the '#' and 'define' is significant. 408 * It foils gcc's fixincludes from defining a redundant 'restrict'. 409 */ 410 /* CSTYLED */ 411 # define _RESTRICT_KYWD restrict 412 #endif 413 #else 414 #define _RESTRICT_KYWD 415 #endif 416 417 /* 418 * The following macro indicates header support for the ANSI C++ 419 * standard. The ISO/IEC designation for this is ISO/IEC FDIS 14882. 420 */ 421 #define _ISO_CPP_14882_1998 422 423 /* 424 * The following macro indicates header support for the C99 standard, 425 * ISO/IEC 9899:1999, Programming Languages - C. 426 */ 427 #define _ISO_C_9899_1999 428 429 /* 430 * The following macro indicates header support for DTrace. The value is an 431 * integer that corresponds to the major version number for DTrace. 432 */ 433 #define _DTRACE_VERSION 1 434 435 #ifdef __cplusplus 436 } 437 #endif 438 439 #endif /* _SYS_FEATURE_TESTS_H */ 440