2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Berkeley Software Design, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
33 * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
40 * Testing against Clang-specific extensions.
42 #ifndef __has_attribute
43 #define __has_attribute(x) 0
45 #ifndef __has_extension
46 #define __has_extension __has_feature
49 #define __has_feature(x) 0
52 #define __has_include(x) 0
55 #define __has_builtin(x) 0
59 * Macro to test if we are using a specific version of gcc or later.
61 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
62 #define __GNUC_PREREQ__(ma, mi) \
63 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
65 #define __GNUC_PREREQ__(ma, mi) 0
68 #if defined(__cplusplus)
69 #if __GNUC_PREREQ__(4, 0)
70 #define __BEGIN_DECLS _Pragma("GCC visibility push(default)") extern "C" {
71 #define __END_DECLS } _Pragma("GCC visibility pop")
73 #define __BEGIN_DECLS extern "C" {
82 * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
83 * size that can be found across most recent and somewhat latest Intel
84 * hardware, i.e. L1 cache sizes etc.
86 * If needed, this value can be TUNED. Suitable values for this macro
87 * are 32, 64 and 128 bytes. The unit of measurement for this macro is
90 * XXX: This macro and related macros will eventually move to a MD
91 * header, but currently, we do need such a hierarchy.
93 #define __VM_CACHELINE_SIZE 64
94 #define __VM_CACHELINE_MASK (__VM_CACHELINE_SIZE - 1)
95 #define __VM_CACHELINE_ALIGN(n) \
96 (((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK)
99 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
100 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
101 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
102 * mode -- there must be no spaces between its arguments, and for nested
103 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
104 * concatenate double-quoted strings produced by the __STRING macro, but
105 * this only works with ANSI C.
107 * __XSTRING is like __STRING, but it expands any macros in its argument
108 * first. It is only available with ANSI C.
110 #if defined(__STDC__) || defined(__cplusplus)
111 #define __P(protos) protos /* full-blown ANSI C */
112 #define __CONCAT1(x,y) x ## y
113 #define __CONCAT(x,y) __CONCAT1(x,y)
114 #define __STRING(x) #x /* stringify without expanding x */
115 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
117 #define __const const /* define reserved names to standard */
118 #define __signed signed
119 #define __volatile volatile
120 #if defined(__cplusplus)
121 #define __inline inline /* convert to C++ keyword */
124 #define __inline /* delete GCC keyword */
125 #endif /* !__GNUC__ */
126 #endif /* !__cplusplus */
128 #else /* !(__STDC__ || __cplusplus) */
129 #define __P(protos) () /* traditional C preprocessor */
130 #define __CONCAT(x,y) x/**/y
131 #define __STRING(x) "x"
134 #define __const /* delete pseudo-ANSI C keywords */
139 * In non-ANSI C environments, new programs will want ANSI-only C keywords
140 * deleted from the program and old programs will want them left alone.
141 * When using a compiler other than gcc, programs using the ANSI C keywords
142 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
143 * When using "gcc -traditional", we assume that this is the intent; if
144 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
146 #ifndef NO_ANSI_KEYWORDS
147 #define const /* delete ANSI C keywords */
151 #endif /* !NO_ANSI_KEYWORDS */
152 #endif /* !__GNUC__ */
153 #endif /* !(__STDC__ || __cplusplus) */
156 * Compiler-dependent macros to help declare dead (non-returning) and
157 * pure (no side effects) functions, and unused variables. They are
158 * null except for versions of gcc that are known to support the features
159 * properly (old versions of gcc-2 supported the dead and pure features
160 * in a different (wrong) way).
169 #define __alloc_align(x)
170 #define __alloc_size(x)
171 #define __alloc_size2(n, x)
173 #define __always_inline
174 #define __nonnull(...)
177 #define __returns_twice
178 #define __weak_symbol
182 #define __weak_symbol __attribute__((__weak__))
183 #if __GNUC_PREREQ__(2, 7)
184 #define __dead2 __attribute__((__noreturn__))
185 #define __pure2 __attribute__((__const__))
186 #define __unused __attribute__((__unused__))
187 #define __packed __attribute__((__packed__))
188 #define __aligned(x) __attribute__((__aligned__(x)))
189 #define __section(x) __attribute__((__section__(x)))
196 #if __GNUC_PREREQ__(2, 96)
197 #define __malloclike __attribute__((__malloc__))
198 #define __pure __attribute__((__pure__))
201 #define __pure __pure2
204 #if __GNUC_PREREQ__(3, 1)
205 #define __always_inline __attribute__((__always_inline__))
206 #define __noinline __attribute__((__noinline__))
208 #define __always_inline
212 #if __GNUC_PREREQ__(3, 3)
213 #define __nonnull(...) __attribute__((__nonnull__(__VA_ARGS__)))
214 #define __used __attribute__((__used__))
216 #define __nonnull(...)
217 #define __used __unused
220 #if __GNUC_PREREQ__(3, 4)
221 #define __heedresult __attribute__((__warn_unused_result__))
226 #if __GNUC_PREREQ__(4, 1)
227 #define __returns_twice __attribute__((__returns_twice__))
229 #define __returns_twice
232 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
233 #define __alloc_size(x) __attribute__((__alloc_size__(x)))
234 #define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x)))
236 #define __alloc_size(x)
237 #define __alloc_size2(n, x)
240 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
241 #define __alloc_align(x) __attribute__((__alloc_align__(x)))
243 #define __alloc_align(x)
248 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901
249 #define __func__ NULL
252 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \
253 __STDC_VERSION__ >= 199901
254 #define __LONG_LONG_SUPPORTED
257 /* C++11 exposes a load of C99 stuff */
258 #if defined(__cplusplus) && __cplusplus >= 201103L
259 #define __LONG_LONG_SUPPORTED
260 #ifndef __STDC_LIMIT_MACROS
261 #define __STDC_LIMIT_MACROS
263 #ifndef __STDC_CONSTANT_MACROS
264 #define __STDC_CONSTANT_MACROS
269 * GCC 2.95 and later provides `__restrict' as an extension to C90 to support
270 * the C99-specific `restrict' type qualifier. We happen to use `__restrict'
271 * as a way to define the `restrict' type qualifier without disturbing older
272 * software that is unaware of C99 keywords.
274 #if !__GNUC_PREREQ__(2, 95)
275 #if __STDC_VERSION__ < 199901
278 #define __restrict restrict
283 * C99 allows to declare arrays as non-overlapping.
285 #if __GNUC_PREREQ__(3, 1) && !defined(__GNUG__)
286 #define __restrict_arr __restrict
289 #define __restrict_arr
291 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901
292 #define __restrict_arr restrict
294 #define __restrict_arr
300 * GNU C version 2.96 adds explicit branch prediction so that
301 * the CPU back-end can hint the processor and also so that
302 * code blocks can be reordered such that the predicted path
303 * sees a more linear flow, thus improving cache behavior, etc.
305 * The following two macros provide us with a way to utilize this
306 * compiler feature. Use __predict_true() if you expect the expression
307 * to evaluate to true, and __predict_false() if you expect the
308 * expression to evaluate to false.
310 * A few notes about usage:
312 * * Generally, __predict_false() error condition checks (unless
313 * you have some _strong_ reason to do otherwise, in which case
314 * document it), and/or __predict_true() `no-error' condition
315 * checks, assuming you want to optimize for the no-error case.
317 * * Other than that, if you don't know the likelihood of a test
318 * succeeding from empirical or other `hard' evidence, don't
321 * * These are meant to be used in places that are run `a lot'.
322 * It is wasteful to make predictions in code that is run
323 * seldomly (e.g. at subsystem initialization time) as the
324 * basic block reordering that this affects can often generate
327 #if __GNUC_PREREQ__(2, 96)
328 #define __predict_true(exp) __builtin_expect((exp), 1)
329 #define __predict_false(exp) __builtin_expect((exp), 0)
331 #define __predict_true(exp) (exp)
332 #define __predict_false(exp) (exp)
336 * Compiler-dependent macros to declare that functions take printf-like
337 * or scanf-like arguments. They are null except for versions of gcc
338 * that are known to support the features properly (old versions of gcc-2
339 * didn't permit keeping the keywords out of the application namespace).
341 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
343 #if !__GNUC_PREREQ__(2, 7)
344 #define __printflike(fmtarg, firstvararg)
345 #define __scanflike(fmtarg, firstvararg)
346 #define __printf0like(fmtarg, firstvararg)
347 #define __format_arg(fmtarg)
348 #define __strfmonlike(fmtarg, firstvararg)
349 #define __strftimelike(fmtarg, firstvararg)
351 #elif __GNUC_PREREQ__(3, 0)
352 #define __printflike(fmtarg, firstvararg) \
353 __attribute__((__nonnull__(fmtarg), \
354 __format__ (__printf__, fmtarg, firstvararg)))
355 #define __printf0like(fmtarg, firstvararg) \
356 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
357 #define __scanflike(fmtarg, firstvararg) \
358 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
359 #define __format_arg(fmtarg) \
360 __attribute__((__format_arg__ (fmtarg)))
361 #define __strfmonlike(fmtarg, firstvararg) \
362 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
363 #define __strftimelike(fmtarg, firstvararg) \
364 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
367 #define __printflike(fmtarg, firstvararg) \
368 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
369 #define __printf0like(fmtarg, firstvararg) \
370 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
371 #define __scanflike(fmtarg, firstvararg) \
372 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
373 #define __format_arg(fmtarg) \
374 __attribute__((__format_arg__ (fmtarg)))
375 #define __strfmonlike(fmtarg, firstvararg) \
376 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
377 #define __strftimelike(fmtarg, firstvararg) \
378 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
381 #if !__GNUC_PREREQ__(3, 0)
382 #define __ARRAY_ZERO 0
387 #if __GNUC_PREREQ__(4, 0)
388 #define __dso_public __attribute__((__visibility__("default")))
389 #define __dso_hidden __attribute__((__visibility__("hidden")))
396 * A convenient constructor macro, GCC 4.3.0 added priority support to
397 * constructors, provide a compatible interface for both.
399 #if __GNUC_PREREQ__(4, 3)
400 #define __constructor(prio) __attribute__((constructor(prio)))
402 #define __constructor(prio) __attribute__((constructor))
406 * Handy GCC based macros:
410 * The __cachealign macro can be used for cache line aligning structures
411 * of small to medium size. It aligns the particular structure or
412 * storage type to a system default cache line alignment, thus giving us
413 * a much more better cache utilization by making the hardware work at
414 * its best burst speeds.
418 * The __usereg macro can/should be used when a function contains
419 * arguments not more than 3. It can be very useful to us due to the
420 * message-passing nature of the kernel.
422 * !!NOTE - USAGE INFORMATION!!
424 * The __cachealign macro should not be used for data structures that are
425 * as big struct proc, struct vnode, struct thread, and other structs which
426 * are as big as them; simply because it will be useless in that case.
428 * The __usereg macro should be used whenever possible, i.e., when a function
429 * does not exceed more than 3 arguments, and should not be used for vararg
432 * In other words, AVOID MISUSE OF THESE MACROS. :-)
435 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE)))
436 #define __usereg __attribute__((__regparm__(3)))
443 #define __strong_reference(sym,aliassym) \
444 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
445 #define __weak_reference(sym,aliassym) \
446 __strong_reference(sym,aliassym) __attribute__ ((__weak__))
447 #define __weak_reference_asm(sym,alias) \
448 __asm__(".weak " #alias); \
449 __asm__(".equ " #alias ", " #sym)
450 #define __warn_references(sym,msg) \
451 __asm__(".section .gnu.warning." #sym); \
452 __asm__(".asciz \"" msg "\""); \
454 #endif /* __GNUC__ */
456 #if defined(__GNUC__)
457 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
461 #define __RCSID(s) struct __hack
464 #ifndef __RCSID_SOURCE
465 #define __RCSID_SOURCE(s) struct __hack
469 #define __SCCSID(s) struct __hack
473 #define __FBSDID(s) struct __hack
477 #define __COPYRIGHT(s) struct __hack
481 #define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
485 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
489 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var))
493 * Keywords added in C11.
496 #if !__GNUC_PREREQ__(2, 95)
497 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
500 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
502 #if !__has_extension(c_alignas)
503 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
504 __has_extension(cxx_alignas)
505 #define _Alignas(x) alignas(x)
507 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
508 #define _Alignas(x) __aligned(x)
512 #if defined(__cplusplus) && __cplusplus >= 201103L
513 #define _Alignof(x) alignof(x)
515 #define _Alignof(x) __alignof(x)
518 #if !defined(_Noreturn)
519 #define _Noreturn __dead2
522 #if !__has_extension(c_static_assert)
523 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
524 __has_extension(cxx_static_assert)
525 #define _Static_assert(x, y) static_assert(x, y)
526 #elif !__GNUC_PREREQ__(4, 6)
527 #define _Static_assert(x, y) struct __hack
529 #define CTASSERT(x) _CTASSERT(x, __LINE__)
530 #define _CTASSERT(x, y) __CTASSERT(x, y)
531 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
536 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
538 #if defined(_KERNEL) && !defined(CTASSERT)
539 #define CTASSERT(x) _Static_assert(x, \
540 "compile-time assertion failed")
544 * Emulation of C11 _Generic(). Unlike the previously defined C11
545 * keywords, it is not possible to implement this using exactly the same
546 * syntax. Therefore implement something similar under the name
547 * __generic(). Unlike _Generic(), this macro can only distinguish
548 * between a single type, so it requires nested invocations to
549 * distinguish multiple cases.
552 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
553 #define __generic(expr, t, yes, no) \
554 _Generic(expr, t: yes, default: no)
555 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
556 #define __generic(expr, t, yes, no) \
557 __builtin_choose_expr( \
558 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
562 * POSIX.1 requires that the macros we test be defined before any standard
563 * header file is included.
565 * Here's a quick run-down of the versions:
566 * defined(_POSIX_SOURCE) 1003.1-1988
567 * _POSIX_C_SOURCE == 1 1003.1-1990
568 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
569 * _POSIX_C_SOURCE == 199309 1003.1b-1993
570 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
571 * and the omnibus ISO/IEC 9945-1: 1996
572 * _POSIX_C_SOURCE == 200112 1003.1-2001
573 * _POSIX_C_SOURCE == 200809 1003.1-2008
575 * In addition, the X/Open Portability Guide, which is now the Single UNIX
576 * Specification, defines a feature-test macro which indicates the version of
577 * that specification, and which subsumes _POSIX_C_SOURCE.
579 * Our macros begin with two underscores to avoid namespace screwage.
583 * If no special macro was specified, make the DragonFly extensions
584 * available. Also make them available when requested so.
586 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \
587 !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \
588 defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE)
589 #define __DF_VISIBLE 1
591 #define __DF_VISIBLE 0
594 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
595 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1
596 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
597 #define _POSIX_C_SOURCE 199009
600 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
601 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2
602 #undef _POSIX_C_SOURCE
603 #define _POSIX_C_SOURCE 199209
606 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
608 #if _XOPEN_SOURCE - 0 >= 700
609 #define __XSI_VISIBLE 700
610 #undef _POSIX_C_SOURCE
611 #define _POSIX_C_SOURCE 200809
612 #elif _XOPEN_SOURCE - 0 >= 600
613 #define __XSI_VISIBLE 600
614 #undef _POSIX_C_SOURCE
615 #define _POSIX_C_SOURCE 200112
616 #elif _XOPEN_SOURCE - 0 >= 500
617 #define __XSI_VISIBLE 500
618 #undef _POSIX_C_SOURCE
619 #define _POSIX_C_SOURCE 199506
624 * Deal with all versions of POSIX. The ordering relative to the tests above is
627 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
628 #define _POSIX_C_SOURCE 198808
630 #ifdef _POSIX_C_SOURCE
631 #if (_POSIX_C_SOURCE - 0) >= 200809
632 #define __POSIX_VISIBLE 200809
633 #define __ISO_C_VISIBLE 1999
634 #elif (_POSIX_C_SOURCE - 0) >= 200112
635 #define __POSIX_VISIBLE 200112
636 #define __ISO_C_VISIBLE 1999
637 #elif (_POSIX_C_SOURCE - 0) >= 199506
638 #define __POSIX_VISIBLE 199506
639 #define __ISO_C_VISIBLE 1990
640 #elif (_POSIX_C_SOURCE - 0) >= 199309
641 #define __POSIX_VISIBLE 199309
642 #define __ISO_C_VISIBLE 1990
643 #elif (_POSIX_C_SOURCE - 0) >= 199209
644 #define __POSIX_VISIBLE 199209
645 #define __ISO_C_VISIBLE 1990
646 #elif (_POSIX_C_SOURCE - 0) >= 199009
647 #define __POSIX_VISIBLE 199009
648 #define __ISO_C_VISIBLE 1990
650 #define __POSIX_VISIBLE 198808
651 #define __ISO_C_VISIBLE 0
652 #endif /* _POSIX_C_SOURCE */
655 * Deal with _ANSI_SOURCE:
656 * If it is defined, and no other compilation environment is explicitly
657 * requested, then define our internal feature-test macros to zero. This
658 * makes no difference to the preprocessor (undefined symbols in preprocessing
659 * expressions are defined to have value zero), but makes it more convenient for
660 * a test program to print out the values.
662 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
663 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
664 * environment (and in fact we will never get here).
666 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
667 #define __POSIX_VISIBLE 0
668 #define __XSI_VISIBLE 0
669 #define __BSD_VISIBLE 0
670 #define __ISO_C_VISIBLE 1990
671 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
672 #define __POSIX_VISIBLE 0
673 #define __XSI_VISIBLE 0
674 #define __BSD_VISIBLE 0
675 #define __ISO_C_VISIBLE 1999
676 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
677 #define __POSIX_VISIBLE 0
678 #define __XSI_VISIBLE 0
679 #define __BSD_VISIBLE 0
680 #define __ISO_C_VISIBLE 2011
681 #else /* Default environment: show everything. */
682 #define __POSIX_VISIBLE 200809
683 #define __XSI_VISIBLE 700
684 #define __BSD_VISIBLE 1
685 #define __ISO_C_VISIBLE 2011
690 * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
691 * of kernel modules which are discarded from binutils 2.17.50+ otherwise.
694 #define __GLOBL1(sym) __asm__(".globl " #sym)
695 #define __GLOBL(sym) __GLOBL1(sym)
697 #endif /* !_SYS_CDEFS_H_ */