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.
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.
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]
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 #ifndef _SYS_FEATURE_TESTS_H
28 #define _SYS_FEATURE_TESTS_H
30 #include <sys/ccompile.h>
37 * Values of _POSIX_C_SOURCE
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)
46 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
47 #define _POSIX_C_SOURCE 1
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.
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.
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.
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.
81 #if defined(_XOPEN_SOURCE) || defined(_POSIX_C_SOURCE)
82 #define __XOPEN_OR_POSIX
86 * ISO/IEC 9899:1990 and it's revision, ISO/IEC 9899:1999 specify the
87 * following predefined macro name:
89 * __STDC__ The integer constant 1, intended to indicate a conforming
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.
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__.
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.
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:
112 * Value of __STDC__ __STRICT_ANSI__
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
119 * gcc (default) 1 undefined
120 * gcc -ansi, -std={c89, c99,...) 1 defined
121 * gcc -traditional (K&R) undefined undefined
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:
130 #if (__STDC__ - 0 == 1 && !defined(__GNUC__)) || \
131 (defined(__GNUC__) && defined(__STRICT_ANSI__))
138 * Compiler complies with ISO/IEC 9899:1999
141 #if __STDC_VERSION__ - 0 >= 199901L
148 * Large file interfaces:
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.)
157 * The corresponding announcement macros are respectively:
160 * (These are set in <unistd.h>.)
162 * Requesting _LARGEFILE64_SOURCE implies requesting _LARGEFILE_SOURCE as
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__
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.)
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
182 #if _LARGEFILE64_SOURCE - 0 == 1
183 #undef _LARGEFILE_SOURCE
184 #define _LARGEFILE_SOURCE 1
188 * Large file compilation environment control:
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.
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.
197 * In the 64-bit compilation environment, the only value allowed is 64.
200 #ifndef _FILE_OFFSET_BITS
201 #define _FILE_OFFSET_BITS 64
203 #if _FILE_OFFSET_BITS - 0 != 64
204 #error "invalid _FILE_OFFSET_BITS value specified"
207 #ifndef _FILE_OFFSET_BITS
208 #define _FILE_OFFSET_BITS 32
210 #if _FILE_OFFSET_BITS - 0 != 32 && _FILE_OFFSET_BITS - 0 != 64
211 #error "invalid _FILE_OFFSET_BITS value specified"
216 * Use of _XOPEN_SOURCE
218 * The following X/Open specifications are supported:
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.
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,
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.
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).
238 * Feature Test Macro Specification
239 * ------------------------------------------------ -------------
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
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
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.
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)
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)
270 /* X/Open CAE Specification, Issue 4 */
271 #elif (defined(_XOPEN_SOURCE) && _XOPEN_VERSION - 0 == 4)
274 /* X/Open CAE Specification, Issue 4, Version 2 */
275 #elif (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE_EXTENDED - 0 == 1)
279 /* X/Open CAE Specification, Issue 5 */
280 #elif (_XOPEN_SOURCE - 0 == 500)
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)
294 #undef _POSIX_C_SOURCE
295 #define _POSIX_C_SOURCE 200112L
297 #define _XOPEN_SOURCE 600
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.
312 #ifndef _XOPEN_VERSION
314 #define _XOPEN_VERSION 600
316 #define _XOPEN_VERSION 500
317 #elif defined(_XPG4_2)
318 #define _XOPEN_VERSION 4
320 #define _XOPEN_VERSION 3
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.
328 * The presence of _LONGLONG_TYPE says "long long exists" which is therefore
329 * defined in all but strictly conforming environments that disallow it.
331 #if !defined(_STDC_C99) && defined(_STRICT_STDC) && !defined(__GNUC__)
333 * Resist attempts to force the definition of long long in this case.
335 #if defined(_LONGLONG_TYPE)
336 #error "No long long in strictly conforming ANSI C & 1990 ISO C environments"
339 #if !defined(_LONGLONG_TYPE)
340 #define _LONGLONG_TYPE
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.
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"
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.
367 #if (defined(__STDC__) && defined(_STDC_C99)) && !defined(__cplusplus)
368 #define _RESTRICT_KYWD restrict
370 #define _RESTRICT_KYWD
374 * The following macro indicates header support for the ANSI C++
375 * standard. The ISO/IEC designation for this is ISO/IEC FDIS 14882.
377 #define _ISO_CPP_14882_1998
380 * The following macro indicates header support for the C99 standard,
381 * ISO/IEC 9899:1999, Programming Languages - C.
383 #define _ISO_C_9899_1999
386 * The following macro indicates header support for DTrace. The value is an
387 * integer that corresponds to the major version number for DTrace.
389 #define _DTRACE_VERSION 1
395 #endif /* _SYS_FEATURE_TESTS_H */