1 /* Specialized bits of code needed to support construction and
2 destruction of file-scope objects in C++ code.
3 Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
5 Contributed by Ron Guilmette (rfg@monkeys.com).
6
7 This file is part of GCC.
8
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 2, or (at your option) any later
12 version.
13
14 In addition to the permissions in the GNU General Public License, the
15 Free Software Foundation gives you unlimited permission to link the
16 compiled version of this file into combinations with other programs,
17 and to distribute those combinations without any restriction coming
18 from the use of this file. (The General Public License restrictions
19 do apply in other respects; for example, they cover modification of
20 the file, and distribution when not linked into a combine
21 executable.)
22
23 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
24 WARRANTY; without even the implied warranty of MERCHANTABILITY or
25 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
26 for more details.
27
28 You should have received a copy of the GNU General Public License
29 along with GCC; see the file COPYING. If not, write to the Free
30 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
31 02110-1301, USA. */
32
33 /* This file is a bit like libgcc2.c in that it is compiled
34 multiple times and yields multiple .o files.
35
36 This file is useful on target machines where the object file format
37 supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On
38 such systems, this file allows us to avoid running collect (or any
39 other such slow and painful kludge). Additionally, if the target
40 system supports a .init section, this file allows us to support the
41 linking of C++ code with a non-C++ main program.
42
43 Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then
44 this file *will* make use of the .init section. If that symbol is
45 not defined however, then the .init section will not be used.
46
47 Currently, only ELF and COFF are supported. It is likely however that
48 ROSE could also be supported, if someone was willing to do the work to
49 make whatever (small?) adaptations are needed. (Some work may be
50 needed on the ROSE assembler and linker also.)
51
52 This file must be compiled with gcc. */
53
54 /* Target machine header files require this define. */
55 #define IN_LIBGCC2
56
57 /* FIXME: Including auto-host is incorrect, but until we have
58 identified the set of defines that need to go into auto-target.h,
59 this will have to do. */
60 #include "auto-host.h"
61 #undef gid_t
62 #undef pid_t
63 #undef rlim_t
64 #undef ssize_t
65 #undef uid_t
66 #undef vfork
67 #include "tconfig.h"
68 #include "tsystem.h"
69 #include "coretypes.h"
70 #include "tm.h"
71 #include "unwind-dw2-fde.h"
72
73 #ifndef FORCE_CODE_SECTION_ALIGN
74 # define FORCE_CODE_SECTION_ALIGN
75 #endif
76
77 #ifndef CRT_CALL_STATIC_FUNCTION
78 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
79 static void __attribute__((__used__)) \
80 call_ ## FUNC (void) \
81 { \
82 asm (SECTION_OP); \
83 FUNC (); \
84 FORCE_CODE_SECTION_ALIGN \
85 asm (TEXT_SECTION_ASM_OP); \
86 }
87 #endif
88
89 #if defined(OBJECT_FORMAT_ELF) && defined(HAVE_LD_EH_FRAME_HDR) \
90 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
91 && defined(__GLIBC__) && __GLIBC__ >= 2
92 #include <link.h>
93 # if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
94 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
95 # define USE_PT_GNU_EH_FRAME
96 # endif
97 #endif
98 #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME)
99 # define USE_EH_FRAME_REGISTRY
100 #endif
101 #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY
102 # define EH_FRAME_SECTION_CONST const
103 #else
104 # define EH_FRAME_SECTION_CONST
105 #endif
106
107 /* We do not want to add the weak attribute to the declarations of these
108 routines in unwind-dw2-fde.h because that will cause the definition of
109 these symbols to be weak as well.
110
111 This exposes a core issue, how to handle creating weak references vs
112 how to create weak definitions. Either we have to have the definition
113 of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or
114 have a second declaration if we want a function's references to be weak,
115 but not its definition.
116
117 Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until
118 one thinks about scaling to larger problems -- i.e., the condition under
119 which TARGET_WEAK_ATTRIBUTE is active will eventually get far too
120 complicated.
121
122 So, we take an approach similar to #pragma weak -- we have a second
123 declaration for functions that we want to have weak references.
124
125 Neither way is particularly good. */
126
127 /* References to __register_frame_info and __deregister_frame_info should
128 be weak in this file if at all possible. */
129 extern void __register_frame_info (const void *, struct object *)
130 TARGET_ATTRIBUTE_WEAK;
131 extern void __register_frame_info_bases (const void *, struct object *,
132 void *, void *)
133 TARGET_ATTRIBUTE_WEAK;
134 extern void *__deregister_frame_info (const void *)
135 TARGET_ATTRIBUTE_WEAK;
136 extern void *__deregister_frame_info_bases (const void *)
137 TARGET_ATTRIBUTE_WEAK;
138 extern void __do_global_ctors_1 (void);
139
140 /* Likewise for _Jv_RegisterClasses. */
141 extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK;
142
143 #ifdef OBJECT_FORMAT_ELF
144
145 /* Declare a pointer to void function type. */
146 typedef void (*func_ptr) (void);
147 #define STATIC static
148
149 #else /* OBJECT_FORMAT_ELF */
150
151 #include "gbl-ctors.h"
152
153 #define STATIC
154
155 #endif /* OBJECT_FORMAT_ELF */
156
157 #ifdef CRT_BEGIN
158
159 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange
160 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
161 __DTOR_END__ } per root executable and also one set of these symbols
162 per shared library. So in any given whole process image, we may have
163 multiple definitions of each of these symbols. In order to prevent
164 these definitions from conflicting with one another, and in order to
165 ensure that the proper lists are used for the initialization/finalization
166 of each individual shared library (respectively), we give these symbols
167 only internal (i.e. `static') linkage, and we also make it a point to
168 refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__
169 symbol in crtbegin.o, where they are defined. */
170
171 /* The -1 is a flag to __do_global_[cd]tors indicating that this table
172 does not start with a count of elements. */
173 #ifdef CTOR_LIST_BEGIN
174 CTOR_LIST_BEGIN;
175 #elif defined(CTORS_SECTION_ASM_OP)
176 /* Hack: force cc1 to switch to .data section early, so that assembling
177 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
178 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
179 asm (CTORS_SECTION_ASM_OP);
180 STATIC func_ptr __CTOR_LIST__[1]
181 __attribute__ ((__unused__, aligned(sizeof(func_ptr))))
182 = { (func_ptr) (-1) };
183 #else
184 STATIC func_ptr __CTOR_LIST__[1]
185 __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr))))
186 = { (func_ptr) (-1) };
187 #endif /* __CTOR_LIST__ alternatives */
188
189 #ifdef DTOR_LIST_BEGIN
190 DTOR_LIST_BEGIN;
191 #elif defined(DTORS_SECTION_ASM_OP)
192 asm (DTORS_SECTION_ASM_OP);
193 STATIC func_ptr __DTOR_LIST__[1]
194 __attribute__ ((aligned(sizeof(func_ptr))))
195 = { (func_ptr) (-1) };
196 #else
197 STATIC func_ptr __DTOR_LIST__[1]
198 __attribute__((section(".dtors"), aligned(sizeof(func_ptr))))
199 = { (func_ptr) (-1) };
200 #endif /* __DTOR_LIST__ alternatives */
201
202 #ifdef USE_EH_FRAME_REGISTRY
203 /* Stick a label at the beginning of the frame unwind info so we can register
204 and deregister it with the exception handling library code. */
205 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
206 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4)))
207 = { };
208 #endif /* USE_EH_FRAME_REGISTRY */
209
210 #ifdef JCR_SECTION_NAME
211 /* Stick a label at the beginning of the java class registration info
212 so we can register them properly. */
213 STATIC void *__JCR_LIST__[]
214 __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*))))
215 = { };
216 #endif /* JCR_SECTION_NAME */
217
218 #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP)
219
220 #ifdef OBJECT_FORMAT_ELF
221
222 /* Declare the __dso_handle variable. It should have a unique value
223 in every shared-object; in a main program its value is zero. The
224 object should in any case be protected. This means the instance
225 in one DSO or the main program is not used in another object. The
226 dynamic linker takes care of this. */
227
228 #ifdef TARGET_LIBGCC_SDATA_SECTION
229 extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION)));
230 #endif
231 #ifdef HAVE_GAS_HIDDEN
232 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
233 #endif
234 #ifdef CRTSTUFFS_O
235 void *__dso_handle = &__dso_handle;
236 #else
237 void *__dso_handle = 0;
238 #endif
239
240 /* The __cxa_finalize function may not be available so we use only a
241 weak declaration. */
242 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
243
244 /* Run all the global destructors on exit from the program. */
245
246 /* Some systems place the number of pointers in the first word of the
247 table. On SVR4 however, that word is -1. In all cases, the table is
248 null-terminated. On SVR4, we start from the beginning of the list and
249 invoke each per-compilation-unit destructor routine in order
250 until we find that null.
251
252 Note that this function MUST be static. There will be one of these
253 functions in each root executable and one in each shared library, but
254 although they all have the same code, each one is unique in that it
255 refers to one particular associated `__DTOR_LIST__' which belongs to the
256 same particular root executable or shared library file.
257
258 On some systems, this routine is run more than once from the .fini,
259 when exit is called recursively, so we arrange to remember where in
260 the list we left off processing, and we resume at that point,
261 should we be re-invoked. */
262
263 static void __attribute__((used))
__do_global_dtors_aux(void)264 __do_global_dtors_aux (void)
265 {
266 #ifndef FINI_ARRAY_SECTION_ASM_OP
267 static func_ptr *p = __DTOR_LIST__ + 1;
268 func_ptr f;
269 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
270 static _Bool completed;
271
272 if (__builtin_expect (completed, 0))
273 return;
274
275 #ifdef CRTSTUFFS_O
276 if (__cxa_finalize)
277 __cxa_finalize (__dso_handle);
278 #endif
279
280 #ifdef FINI_ARRAY_SECTION_ASM_OP
281 /* If we are using .fini_array then destructors will be run via that
282 mechanism. */
283 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
284 while ((f = *p))
285 {
286 p++;
287 f ();
288 }
289 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
290
291 #ifdef USE_EH_FRAME_REGISTRY
292 #ifdef CRT_GET_RFIB_DATA
293 /* If we used the new __register_frame_info_bases interface,
294 make sure that we deregister from the same place. */
295 if (__deregister_frame_info_bases)
296 __deregister_frame_info_bases (__EH_FRAME_BEGIN__);
297 #else
298 if (__deregister_frame_info)
299 __deregister_frame_info (__EH_FRAME_BEGIN__);
300 #endif
301 #endif
302
303 completed = 1;
304 }
305
306 /* Stick a call to __do_global_dtors_aux into the .fini section. */
307 #ifdef FINI_SECTION_ASM_OP
CRT_CALL_STATIC_FUNCTION(FINI_SECTION_ASM_OP,__do_global_dtors_aux)308 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux)
309 #else /* !defined(FINI_SECTION_ASM_OP) */
310 static func_ptr __do_global_dtors_aux_fini_array_entry[]
311 __attribute__ ((__unused__, section(".fini_array")))
312 = { __do_global_dtors_aux };
313 #endif /* !defined(FINI_SECTION_ASM_OP) */
314
315 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
316 /* Stick a call to __register_frame_info into the .init section. For some
317 reason calls with no arguments work more reliably in .init, so stick the
318 call in another function. */
319
320 static void __attribute__((used))
321 frame_dummy (void)
322 {
323 #ifdef USE_EH_FRAME_REGISTRY
324 static struct object object;
325 #ifdef CRT_GET_RFIB_DATA
326 void *tbase, *dbase;
327 tbase = 0;
328 CRT_GET_RFIB_DATA (dbase);
329 if (__register_frame_info_bases)
330 __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase);
331 #else
332 if (__register_frame_info)
333 __register_frame_info (__EH_FRAME_BEGIN__, &object);
334 #endif /* CRT_GET_RFIB_DATA */
335 #endif /* USE_EH_FRAME_REGISTRY */
336 #ifdef JCR_SECTION_NAME
337 if (__JCR_LIST__[0])
338 {
339 void (*register_classes) (void *) = _Jv_RegisterClasses;
340 __asm ("" : "+r" (register_classes));
341 if (register_classes)
342 register_classes (__JCR_LIST__);
343 }
344 #endif /* JCR_SECTION_NAME */
345 }
346
347 #ifdef INIT_SECTION_ASM_OP
348 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy)
349 #else /* defined(INIT_SECTION_ASM_OP) */
350 static func_ptr __frame_dummy_init_array_entry[]
351 __attribute__ ((__unused__, section(".init_array")))
352 = { frame_dummy };
353 #endif /* !defined(INIT_SECTION_ASM_OP) */
354 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */
355
356 #else /* OBJECT_FORMAT_ELF */
357
358 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
359 and once in crtend.o). It must be declared static to avoid a link
360 error. Here, we define __do_global_ctors as an externally callable
361 function. It is externally callable so that __main can invoke it when
362 INVOKE__main is defined. This has the additional effect of forcing cc1
363 to switch to the .text section. */
364
365 static void __do_global_ctors_aux (void);
366 void
367 __do_global_ctors (void)
368 {
369 #ifdef INVOKE__main
370 /* If __main won't actually call __do_global_ctors then it doesn't matter
371 what's inside the function. The inside of __do_global_ctors_aux is
372 called automatically in that case. And the Alliant fx2800 linker
373 crashes on this reference. So prevent the crash. */
374 __do_global_ctors_aux ();
375 #endif
376 }
377
378 asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
379
380 /* A routine to invoke all of the global constructors upon entry to the
381 program. We put this into the .init section (for systems that have
382 such a thing) so that we can properly perform the construction of
383 file-scope static-storage C++ objects within shared libraries. */
384
385 static void __attribute__((used))
386 __do_global_ctors_aux (void) /* prologue goes in .init section */
387 {
388 FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */
389 asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */
390 DO_GLOBAL_CTORS_BODY;
391 atexit (__do_global_dtors);
392 }
393
394 #endif /* OBJECT_FORMAT_ELF */
395
396 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
397
398 extern void __do_global_dtors (void);
399
400 /* This case is used by the Irix 6 port, which supports named sections but
401 not an SVR4-style .fini section. __do_global_dtors can be non-static
402 in this case because we protect it with -hidden_symbol. */
403
404 void
405 __do_global_dtors (void)
406 {
407 func_ptr *p, f;
408 for (p = __DTOR_LIST__ + 1; (f = *p); p++)
409 f ();
410
411 #ifdef USE_EH_FRAME_REGISTRY
412 if (__deregister_frame_info)
413 __deregister_frame_info (__EH_FRAME_BEGIN__);
414 #endif
415 }
416
417 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
418 /* A helper function for __do_global_ctors, which is in crtend.o. Here
419 in crtbegin.o, we can reference a couple of symbols not visible there.
420 Plus, since we're before libgcc.a, we have no problems referencing
421 functions from there. */
422 void
423 __do_global_ctors_1(void)
424 {
425 #ifdef USE_EH_FRAME_REGISTRY
426 static struct object object;
427 if (__register_frame_info)
428 __register_frame_info (__EH_FRAME_BEGIN__, &object);
429 #endif
430 #ifdef JCR_SECTION_NAME
431 if (__JCR_LIST__[0])
432 {
433 void (*register_classes) (void *) = _Jv_RegisterClasses;
434 __asm ("" : "+r" (register_classes));
435 if (register_classes)
436 register_classes (__JCR_LIST__);
437 }
438 #endif
439 }
440 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */
441
442 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
443 #error "What are you doing with crtstuff.c, then?"
444 #endif
445
446 #elif defined(CRT_END) /* ! CRT_BEGIN */
447
448 /* Put a word containing zero at the end of each of our two lists of function
449 addresses. Note that the words defined here go into the .ctors and .dtors
450 sections of the crtend.o file, and since that file is always linked in
451 last, these words naturally end up at the very ends of the two lists
452 contained in these two sections. */
453
454 #ifdef CTOR_LIST_END
455 CTOR_LIST_END;
456 #elif defined(CTORS_SECTION_ASM_OP)
457 /* Hack: force cc1 to switch to .data section early, so that assembling
458 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
459 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
460 asm (CTORS_SECTION_ASM_OP);
461 STATIC func_ptr __CTOR_END__[1]
462 __attribute__((aligned(sizeof(func_ptr))))
463 = { (func_ptr) 0 };
464 #else
465 STATIC func_ptr __CTOR_END__[1]
466 __attribute__((section(".ctors"), aligned(sizeof(func_ptr))))
467 = { (func_ptr) 0 };
468 #endif
469
470 #ifdef DTOR_LIST_END
471 DTOR_LIST_END;
472 #elif defined(DTORS_SECTION_ASM_OP)
473 asm (DTORS_SECTION_ASM_OP);
474 STATIC func_ptr __DTOR_END__[1]
475 __attribute__ ((unused, aligned(sizeof(func_ptr))))
476 = { (func_ptr) 0 };
477 #else
478 STATIC func_ptr __DTOR_END__[1]
479 __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr))))
480 = { (func_ptr) 0 };
481 #endif
482
483 #ifdef EH_FRAME_SECTION_NAME
484 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
485 this would be the 'length' field in a real FDE. */
486 # if __INT_MAX__ == 2147483647
487 typedef int int32;
488 # elif __LONG_MAX__ == 2147483647
489 typedef long int32;
490 # elif __SHRT_MAX__ == 2147483647
491 typedef short int32;
492 # else
493 # error "Missing a 4 byte integer"
494 # endif
495 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[]
496 __attribute__ ((unused, section(EH_FRAME_SECTION_NAME),
497 aligned(sizeof(int32))))
498 = { 0 };
499 #endif /* EH_FRAME_SECTION_NAME */
500
501 #ifdef JCR_SECTION_NAME
502 /* Null terminate the .jcr section array. */
503 STATIC void *__JCR_END__[1]
504 __attribute__ ((unused, section(JCR_SECTION_NAME),
505 aligned(sizeof(void *))))
506 = { 0 };
507 #endif /* JCR_SECTION_NAME */
508
509 #ifdef INIT_ARRAY_SECTION_ASM_OP
510
511 /* If we are using .init_array, there is nothing to do. */
512
513 #elif defined(INIT_SECTION_ASM_OP)
514
515 #ifdef OBJECT_FORMAT_ELF
516 static void __attribute__((used))
517 __do_global_ctors_aux (void)
518 {
519 func_ptr *p;
520 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
521 (*p) ();
522 }
523
524 /* Stick a call to __do_global_ctors_aux into the .init section. */
525 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux)
526 #else /* OBJECT_FORMAT_ELF */
527
528 /* Stick the real initialization code, followed by a normal sort of
529 function epilogue at the very end of the .init section for this
530 entire root executable file or for this entire shared library file.
531
532 Note that we use some tricks here to get *just* the body and just
533 a function epilogue (but no function prologue) into the .init
534 section of the crtend.o file. Specifically, we switch to the .text
535 section, start to define a function, and then we switch to the .init
536 section just before the body code.
537
538 Earlier on, we put the corresponding function prologue into the .init
539 section of the crtbegin.o file (which will be linked in first).
540
541 Note that we want to invoke all constructors for C++ file-scope static-
542 storage objects AFTER any other possible initialization actions which
543 may be performed by the code in the .init section contributions made by
544 other libraries, etc. That's because those other initializations may
545 include setup operations for very primitive things (e.g. initializing
546 the state of the floating-point coprocessor, etc.) which should be done
547 before we start to execute any of the user's code. */
548
549 static void
550 __do_global_ctors_aux (void) /* prologue goes in .text section */
551 {
552 asm (INIT_SECTION_ASM_OP);
553 DO_GLOBAL_CTORS_BODY;
554 atexit (__do_global_dtors);
555 } /* epilogue and body go in .init section */
556
557 FORCE_CODE_SECTION_ALIGN
558 asm (TEXT_SECTION_ASM_OP);
559
560 #endif /* OBJECT_FORMAT_ELF */
561
562 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
563
564 extern void __do_global_ctors (void);
565
566 /* This case is used by the Irix 6 port, which supports named sections but
567 not an SVR4-style .init section. __do_global_ctors can be non-static
568 in this case because we protect it with -hidden_symbol. */
569 void
570 __do_global_ctors (void)
571 {
572 func_ptr *p;
573 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
574 __do_global_ctors_1();
575 #endif
576 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
577 (*p) ();
578 }
579
580 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
581 #error "What are you doing with crtstuff.c, then?"
582 #endif
583
584 #else /* ! CRT_BEGIN && ! CRT_END */
585 #error "One of CRT_BEGIN or CRT_END must be defined."
586 #endif
587