Print this page
4843 add --as-needed and --no-as-needed to ld
| Split |
Close |
| Expand all |
| Collapse all |
--- old/usr/src/man/man1/ld.1
+++ new/usr/src/man/man1/ld.1
1 1 '\" te
2 2 .\" Copyright 1989 AT&T
3 3 .\" Copyright (c) 2009, Sun Microsystems, Inc. All Rights Reserved
4 4 .\" Copyright (c) 2012, Joyent, Inc. All Rights Reserved
5 5 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License. You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
6 6 .\" See the License for the specific language governing permissions and limitations under the License. When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with
7 7 .\" the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
8 8 .TH LD 1 "Sep 10, 2013"
9 9 .SH NAME
10 10 ld \- link-editor for object files
11 11 .SH SYNOPSIS
12 12 .LP
13 13 .nf
14 14 \fBld\fR [\fB-32\fR | \fB-64\fR] [\fB-a\fR | \fB-r\fR] [\fB-b\fR] [\fB-B\fRdirect | nodirect]
15 15 [\fB-B\fR dynamic | static] [\fB-B\fR eliminate] [\fB-B\fR group] [\fB-B\fR local]
16 16 [\fB-B\fR reduce] [\fB-B\fR symbolic] [\fB-c\fR \fIname\fR] [\fB-C\fR] [\fB-d\fR y | n]
17 17 [\fB-D\fR \fItoken\fR,...] [\fB-e\fR \fIepsym\fR] [\fB-f\fR \fIname\fR | \fB-F\fR \fIname\fR] [\fB-G\fR] [\fB-h\fR \fIname\fR]
18 18 [\fB-i\fR] [\fB-I\fR \fIname\fR] [\fB-l\fR \fIx\fR] [\fB-L\fR \fIpath\fR] [\fB-m\fR] [\fB-M\fR \fImapfile\fR]
19 19 [\fB-N\fR \fIstring\fR] [\fB-o\fR \fIoutfile\fR] [\fB-p\fR \fIauditlib\fR] [\fB-P\fR \fIauditlib\fR]
20 20 [\fB-Q\fR y | n] [\fB-R\fR \fIpath\fR] [\fB-s\fR] [\fB-S\fR \fIsupportlib\fR] [\fB-t\fR]
21 21 [\fB-u\fR \fIsymname\fR] [\fB-V\fR] [\fB-Y P\fR\fI,dirlist\fR] [\fB-z\fR absexec]
22 22 [\fB-z\fR allextract | defaultextract | weakextract ] [\fB-z\fR altexec64]
23 23 [\fB-z\fR assert-deflib ] [ \fB-z\fR assert-deflib=\fIlibname\fR ]
24 24 [\fB-z\fR combreloc | nocombreloc ] [\fB-z\fR defs | nodefs]
25 25 [\fB-z\fR direct | nodirect] [\fB-z\fR endfiltee]
26 26 [\fB-z\fR fatal-warnings | nofatal-warnings ] [\fB-z\fR finiarray=\fIfunction\fR]
27 27 [\fB-z\fR globalaudit] [\fB-z\fR groupperm | nogroupperm]
28 28 [\fB-z\fR guidance[=\fIid1\fR,\fIid2\fR...] [\fB-z\fR help ]
29 29 [\fB-z\fR ignore | record] [\fB-z\fR initarray=\fIfunction\fR] [\fB-z\fR initfirst]
30 30 [\fB-z\fR interpose] [\fB-z\fR lazyload | nolazyload]
31 31 [\fB-z\fR ld32=\fIarg1\fR,\fIarg2\fR,...] [\fB-z\fR ld64=\fIarg1\fR,\fIarg2\fR,...]
32 32 [\fB-z\fR loadfltr] [\fB-z\fR muldefs] [\fB-z\fR nocompstrtab] [\fB-z\fR nodefaultlib]
33 33 [\fB-z\fR nodelete] [\fB-z\fR nodlopen] [\fB-z\fR nodump] [\fB-z\fR noldynsym]
34 34 [\fB-z\fR nopartial] [\fB-z\fR noversion] [\fB-z\fR now] [\fB-z\fR origin]
35 35 [\fB-z\fR preinitarray=\fIfunction\fR] [\fB-z\fR redlocsym] [\fB-z\fR relaxreloc]
36 36 [\fB-z\fR rescan-now] [\fB-z\fR recan] [\fB-z\fR rescan-start \fI\&...\fR \fB-z\fR rescan-end]]
37 37 [\fB-z\fR target=sparc|x86] [\fB-z\fR text | textwarn | textoff]
38 38 [\fB-z\fR verbose] [\fB-z\fR wrap=\fIsymbol\fR] \fIfilename\fR...
39 39 .fi
40 40
41 41 .SH DESCRIPTION
42 42 .sp
43 43 .LP
44 44 The link-editor, \fBld\fR, combines relocatable object files by resolving
45 45 symbol references to symbol definitions, together with performing relocations.
46 46 \fBld\fR operates in two modes, static or dynamic, as governed by the \fB-d\fR
47 47 option. In all cases, the output of \fBld\fR is left in the file \fBa.out\fR by
48 48 default. See NOTES.
49 49 .sp
50 50 .LP
51 51 In dynamic mode, \fB-dy\fR, the default, relocatable object files that are
52 52 provided as arguments are combined to produce an executable object file. This
53 53 file is linked at execution with any shared object files that are provided as
54 54 arguments. If the \fB-G\fR option is specified, relocatable object files are
55 55 combined to produce a shared object. Without the \fB-G\fR option, a dynamic
56 56 executable is created.
57 57 .sp
58 58 .LP
59 59 In static mode, \fB-dn\fR, relocatable object files that are provided as
60 60 arguments are combined to produce a static executable file. If the \fB-r\fR
61 61 option is specified, relocatable object files are combined to produce one
62 62 relocatable object file. See \fBStatic Executables\fR.
63 63 .sp
64 64 .LP
65 65 Dynamic linking is the most common model for combining relocatable objects, and
66 66 the eventual creation of processes within Solaris. This environment tightly
67 67 couples the work of the link-editor and the runtime linker, \fBld.so.1\fR(1).
68 68 Both of these utilities, together with their related technologies and
69 69 utilities, are extensively documented in the \fILinker and Libraries Guide\fR.
70 70 .sp
71 71 .LP
72 72 If any argument is a library, \fBld\fR by default searches the library exactly
73 73 once at the point the library is encountered on the argument list. The library
74 74 can be either a shared object or relocatable archive. See \fBar.h\fR(3HEAD)).
75 75 .sp
76 76 .LP
77 77 A shared object consists of an indivisible, whole unit that has been generated
78 78 by a previous link-edit of one or more input files. When the link-editor
79 79 processes a shared object, the entire contents of the shared object become a
80 80 logical part of the resulting output file image. The shared object is not
81 81 physically copied during the link-edit as its actual inclusion is deferred
82 82 until process execution. This logical inclusion means that all symbol entries
83 83 defined in the shared object are made available to the link-editing process.
84 84 See Chapter 4, \fIShared Objects,\fR in \fILinker and Libraries Guide\fR
85 85 .sp
86 86 .LP
87 87 For an archive library, \fBld\fR loads only those routines that define an
88 88 unresolved external reference. \fBld\fR searches the symbol table of the
89 89 archive library sequentially to resolve external references that can be
90 90 satisfied by library members. This search is repeated until no external
91 91 references can be resolved by the archive. Thus, the order of members in the
92 92 library is functionally unimportant, unless multiple library members exist that
93 93 define the same external symbol. Archive libraries that have interdependencies
94 94 can require multiple command line definitions, or the use of one of the
95 95 \fB-z\fR \fBrescan\fR options. See \fIArchive Processing\fR in \fILinker and
96 96 Libraries Guide\fR.
97 97 .sp
98 98 .LP
99 99 \fBld\fR is a cross link-editor, able to link 32-bit objects or 64-bit objects,
100 100 for Sparc or x86 targets. \fBld\fR uses the \fBELF\fR class and machine type of
101 101 the first relocatable object on the command line to govern the mode in which to
102 102 operate. The mixing of 32-bit objects and 64-bit objects is not permitted.
103 103 Similarly, only objects of a single machine type are allowed. See the
104 104 \fB-32\fR, \fB-64\fR and \fB-z target\fR options, and the \fBLD_NOEXEC_64\fR
105 105 environment variable.
106 106 .SS "Static Executables"
107 107 .sp
108 108 .LP
109 109 The creation of static executables has been discouraged for many releases. In
110 110 fact, 64-bit system archive libraries have never been provided. Because a
111 111 static executable is built against system archive libraries, the executable
112 112 contains system implementation details. This self-containment has a number of
113 113 drawbacks.
114 114 .RS +4
115 115 .TP
116 116 .ie t \(bu
117 117 .el o
118 118 The executable is immune to the benefits of system patches delivered as shared
119 119 objects. The executable therefore, must be rebuilt to take advantage of many
120 120 system improvements.
121 121 .RE
122 122 .RS +4
123 123 .TP
124 124 .ie t \(bu
125 125 .el o
126 126 The ability of the executable to run on future releases can be compromised.
127 127 .RE
128 128 .RS +4
129 129 .TP
130 130 .ie t \(bu
131 131 .el o
132 132 The duplication of system implementation details negatively affects system
133 133 performance.
134 134 .RE
135 135 .sp
136 136 .LP
137 137 With Solaris 10, 32-bit system archive libraries are no longer provided.
138 138 Without these libraries, specifically \fBlibc.a\fR, the creation of static
139 139 executables is no longer achievable without specialized system knowledge.
140 140 However, the capability of \fBld\fR to process static linking options, and the
141 141 processing of archive libraries, remains unchanged.
142 142 .SH OPTIONS
143 143 .sp
144 144 .LP
145 145 The following options are supported.
146 146 .sp
147 147 .ne 2
148 148 .na
149 149 \fB\fB-32\fR | \fB-64\fR\fR
150 150 .ad
151 151 .sp .6
152 152 .RS 4n
153 153 Creates a 32-bit, or 64-bit object.
154 154 .sp
155 155 By default, the class of the object being generated is determined from the
156 156 first \fBELF\fR object processed from the command line. If no objects are
157 157 specified, the class is determined by the first object encountered within the
158 158 first archive processed from the command line. If there are no objects or
159 159 archives, the link-editor creates a 32-bit object.
160 160 .sp
161 161 The \fB-64\fR option is required to create a 64-bit object solely from a
162 162 mapfile.
163 163 .sp
164 164 This \fB-32\fR or \fB-64\fR options can also be used in the rare case of
165 165 linking entirely from an archive that contains a mixture of 32 and 64-bit
166 166 objects. If the first object in the archive is not the class of the object that
167 167 is required to be created, then the \fB-32\fR or \fB-64\fR option can be used
168 168 to direct the link-editor. See \fIThe 32-bit link-editor and 64-bit
169 169 link-editor\fR in \fILinker and Libraries Guide\fR.
170 170 .RE
171 171
172 172 .sp
173 173 .ne 2
174 174 .na
175 175 \fB\fB-a\fR\fR
176 176 .ad
177 177 .sp .6
178 178 .RS 4n
179 179 In static mode only, produces an executable object file. Undefined references
180 180 are not permitted. This option is the default behavior for static mode. The
181 181 \fB-a\fR option can not be used with the \fB-r\fR option. See \fBStatic
182 182 Executables\fR under DESCRIPTION.
183 183 .RE
184 184
185 185 .sp
186 186 .ne 2
187 187 .na
188 188 \fB\fB-b\fR\fR
189 189 .ad
190 190 .sp .6
191 191 .RS 4n
192 192 In dynamic mode only, provides no special processing for dynamic executable
193 193 relocations that reference symbols in shared objects. Without the \fB-b\fR
194 194 option, the link-editor applies techniques within a dynamic executable so that
195 195 the text segment can remain read-only. One technique is the creation of special
196 196 position-independent relocations for references to functions that are defined
197 197 in shared objects. Another technique arranges for data objects that are defined
198 198 in shared objects to be copied into the memory image of an executable at
199 199 runtime.
200 200 .sp
201 201 The \fB-b\fR option is intended for specialized dynamic objects and is not
202 202 recommended for general use. Its use suppresses all specialized processing
203 203 required to ensure an object's shareability, and can even prevent the
204 204 relocation of 64-bit executables.
205 205 .RE
206 206
207 207 .sp
208 208 .ne 2
209 209 .na
210 210 \fB\fB-B\fR \fBdirect\fR | \fBnodirect\fR\fR
211 211 .ad
212 212 .sp .6
213 213 .RS 4n
214 214 These options govern direct binding. \fB-B\fR \fBdirect\fR establishes direct
215 215 binding information by recording the relationship between each symbol reference
216 216 together with the dependency that provides the definition. In addition, direct
217 217 binding information is established between each symbol reference and an
218 218 associated definition within the object being created. The runtime linker uses
219 219 this information to search directly for a symbol in the associated object
220 220 rather than to carry out a default symbol search.
221 221 .sp
222 222 Direct binding information can only be established to dependencies specified
223 223 with the link-edit. Thus, you should use the \fB-z\fR \fBdefs\fR option.
224 224 Objects that wish to interpose on symbols in a direct binding environment
225 225 should identify themselves as interposers with the \fB-z\fR \fBinterpose\fR
226 226 option. The use of \fB-B\fR \fBdirect\fR enables \fB-z\fR \fBlazyload\fR for
227 227 all dependencies.
228 228 .sp
229 229 The \fB-B\fR \fBnodirect\fR option prevents any direct binding to the
230 230 interfaces offered by the object being created. The object being created can
231 231 continue to directly bind to external interfaces by specifying the \fB-z\fR
232 232 \fBdirect\fR option. See Appendix D, \fIDirect Bindings,\fR in \fILinker and
233 233 Libraries Guide\fR.
234 234 .RE
235 235
236 236 .sp
237 237 .ne 2
238 238 .na
239 239 \fB\fB-B\fR \fBdynamic\fR | \fBstatic\fR\fR
240 240 .ad
241 241 .sp .6
242 242 .RS 4n
243 243 Options governing library inclusion. \fB-B\fR \fBdynamic\fR is valid in dynamic
244 244 mode only. These options can be specified any number of times on the command
245 245 line as toggles: if the \fB-B\fR \fBstatic\fR option is given, no shared
246 246 objects are accepted until \fB-B\fR \fBdynamic\fR is seen. See the \fB-l\fR
247 247 option.
248 248 .RE
249 249
250 250 .sp
251 251 .ne 2
252 252 .na
253 253 \fB\fB-B\fR \fBeliminate\fR\fR
254 254 .ad
255 255 .sp .6
256 256 .RS 4n
257 257 Causes any global symbols, not assigned to a version definition, to be
258 258 eliminated from the symbol table. Version definitions can be supplied by means
259 259 of a \fBmapfile\fR to indicate the global symbols that should remain visible in
260 260 the generated object. This option achieves the same symbol elimination as the
261 261 \fIauto-elimination\fR directive that is available as part of a \fBmapfile\fR
262 262 version definition. This option can be useful when combining versioned and
263 263 non-versioned relocatable objects. See also the \fB-B\fR \fBlocal\fR option and
264 264 the \fB-B\fR \fBreduce\fR option. See \fIDefining Additional Symbols with a
265 265 mapfile\fR in \fILinker and Libraries Guide\fR.
266 266 .RE
267 267
268 268 .sp
269 269 .ne 2
270 270 .na
271 271 \fB\fB-B\fR \fBgroup\fR\fR
272 272 .ad
273 273 .sp .6
274 274 .RS 4n
275 275 Establishes a shared object and its dependencies as a group. Objects within the
276 276 group are bound to other members of the group at runtime. This mode is similar
277 277 to adding the object to the process by using \fBdlopen\fR(3C) with the
278 278 \fBRTLD_GROUP\fR mode. An object that has an explicit dependency on a object
279 279 identified as a group, becomes a member of the group.
280 280 .sp
281 281 As the group must be self contained, use of the \fB-B\fR \fBgroup\fR option
282 282 also asserts the \fB-z\fR \fBdefs\fR option.
283 283 .RE
284 284
285 285 .sp
286 286 .ne 2
287 287 .na
288 288 \fB\fB-B\fR \fBlocal\fR\fR
289 289 .ad
290 290 .sp .6
291 291 .RS 4n
292 292 Causes any global symbols, not assigned to a version definition, to be reduced
293 293 to local. Version definitions can be supplied by means of a \fBmapfile\fR to
294 294 indicate the global symbols that should remain visible in the generated object.
295 295 This option achieves the same symbol reduction as the \fIauto-reduction\fR
296 296 directive that is available as part of a \fBmapfile\fR version definition. This
297 297 option can be useful when combining versioned and non-versioned relocatable
298 298 objects. See also the \fB-B\fR \fBeliminate\fR option and the \fB-B\fR
299 299 \fBreduce\fR option. See \fIDefining Additional Symbols with a mapfile\fR in
300 300 \fILinker and Libraries Guide\fR.
301 301 .RE
302 302
303 303 .sp
304 304 .ne 2
305 305 .na
306 306 \fB\fB-B\fR \fBreduce\fR\fR
307 307 .ad
308 308 .sp .6
309 309 .RS 4n
310 310 When generating a relocatable object, causes the reduction of symbolic
311 311 information defined by any version definitions. Version definitions can be
312 312 supplied by means of a \fBmapfile\fR to indicate the global symbols that should
313 313 remain visible in the generated object. By default, when a relocatable object
314 314 is generated, version definitions are only recorded in the output image. The
315 315 actual reduction of symbolic information is carried out when the object is used
316 316 in the construction of a dynamic executable or shared object. The \fB-B\fR
317 317 \fBreduce\fR option is applied automatically when a dynamic executable or
318 318 shared object is created.
319 319 .RE
320 320
321 321 .sp
322 322 .ne 2
323 323 .na
324 324 \fB\fB-B\fR \fBsymbolic\fR\fR
325 325 .ad
326 326 .sp .6
327 327 .RS 4n
328 328 In dynamic mode only. When building a shared object, binds references to global
329 329 symbols to their definitions, if available, within the object. Normally,
330 330 references to global symbols within shared objects are not bound until runtime,
331 331 even if definitions are available. This model allows definitions of the same
332 332 symbol in an executable or other shared object to override the object's own
333 333 definition. \fBld\fR issues warnings for undefined symbols unless \fB-z\fR
334 334 \fBdefs\fR overrides.
335 335 .sp
336 336 The \fB-B\fR \fBsymbolic\fR option is intended for specialized dynamic objects
337 337 and is not recommended for general use. To reduce the runtime relocation
338 338 processing that is required an object, the creation of a version definition is
339 339 recommended.
340 340 .RE
341 341
342 342 .sp
343 343 .ne 2
344 344 .na
345 345 \fB\fB-c\fR \fIname\fR\fR
346 346 .ad
347 347 .sp .6
348 348 .RS 4n
349 349 Records the configuration file \fIname\fR for use at runtime. Configuration
350 350 files can be employed to alter default search paths, provide a directory cache,
351 351 together with providing alternative object dependencies. See \fBcrle\fR(1).
352 352 .RE
353 353
354 354 .sp
355 355 .ne 2
356 356 .na
357 357 \fB\fB-C\fR\fR
358 358 .ad
359 359 .sp .6
360 360 .RS 4n
361 361 Demangles C++ symbol names displayed in diagnostic messages.
362 362 .RE
363 363
364 364 .sp
365 365 .ne 2
366 366 .na
367 367 \fB\fB-d\fR \fBy\fR | \fBn\fR\fR
368 368 .ad
369 369 .sp .6
370 370 .RS 4n
371 371 When \fB-d\fR \fBy\fR, the default, is specified, \fBld\fR uses dynamic
372 372 linking. When \fB-d\fR \fBn\fR is specified, \fBld\fR uses static linking. See
373 373 \fBStatic Executables\fR under DESCRIPTION, and \fB-B\fR
374 374 \fBdynamic\fR|\fBstatic\fR.
375 375 .RE
376 376
377 377 .sp
378 378 .ne 2
379 379 .na
380 380 \fB\fB-D\fR \fItoken\fR,...\fR
381 381 .ad
382 382 .sp .6
383 383 .RS 4n
384 384 Prints debugging information as specified by each \fItoken\fR, to the standard
385 385 error. The special token \fBhelp\fR indicates the full list of tokens
386 386 available. See \fIDebugging Aids\fR in \fILinker and Libraries Guide\fR.
387 387 .RE
388 388
389 389 .sp
390 390 .ne 2
391 391 .na
392 392 \fB\fB-e\fR \fIepsym\fR\fR
393 393 .ad
394 394 .br
395 395 .na
396 396 \fB\fB--entry\fR \fIepsym\fR\fR
397 397 .ad
398 398 .sp .6
399 399 .RS 4n
400 400 Sets the entry point address for the output file to be the symbol \fIepsym\fR.
401 401 .RE
402 402
403 403 .sp
404 404 .ne 2
405 405 .na
406 406 \fB\fB-f\fR \fIname\fR\fR
407 407 .ad
408 408 .br
409 409 .na
410 410 \fB\fB--auxiliary\fR \fIname\fR\fR
411 411 .ad
412 412 .sp .6
413 413 .RS 4n
414 414 Useful only when building a shared object. Specifies that the symbol table of
415 415 the shared object is used as an auxiliary filter on the symbol table of the
416 416 shared object specified by \fIname\fR. Multiple instances of this option are
417 417 allowed. This option can not be combined with the \fB-F\fR option. See
418 418 \fIGenerating Auxiliary Filters\fR in \fILinker and Libraries Guide\fR.
419 419 .RE
420 420
421 421 .sp
422 422 .ne 2
423 423 .na
424 424 \fB\fB-F\fR \fIname\fR\fR
425 425 .ad
426 426 .br
427 427 .na
428 428 \fB\fB--filter\fR \fIname\fR\fR
429 429 .ad
430 430 .sp .6
431 431 .RS 4n
432 432 Useful only when building a shared object. Specifies that the symbol table of
433 433 the shared object is used as a filter on the symbol table of the shared object
434 434 specified by \fIname\fR. Multiple instances of this option are allowed. This
435 435 option can not be combined with the \fB-f\fR option. See \fIGenerating Standard
436 436 Filters\fR in \fILinker and Libraries Guide\fR.
437 437 .RE
438 438
439 439 .sp
440 440 .ne 2
441 441 .na
442 442 \fB\fB-G\fR\fR
443 443 .ad
444 444 .br
445 445 .na
446 446 \fB\fB-shared\fR\fR
447 447 .ad
448 448 .sp .6
449 449 .RS 4n
450 450 In dynamic mode only, produces a shared object. Undefined symbols are allowed.
451 451 See Chapter 4, \fIShared Objects,\fR in \fILinker and Libraries Guide\fR.
452 452 .RE
453 453
454 454 .sp
455 455 .ne 2
456 456 .na
457 457 \fB\fB-h\fR \fIname\fR\fR
458 458 .ad
459 459 .br
460 460 .na
461 461 \fB\fB--soname\fR \fIname\fR\fR
462 462 .ad
463 463 .sp .6
464 464 .RS 4n
465 465 In dynamic mode only, when building a shared object, records \fIname\fR in the
466 466 object's dynamic section. \fIname\fR is recorded in any dynamic objects that
467 467 are linked with this object rather than the object's file system name.
468 468 Accordingly, \fIname\fR is used by the runtime linker as the name of the shared
469 469 object to search for at runtime. See \fIRecording a Shared Object Name\fR in
470 470 \fILinker and Libraries Guide\fR.
471 471 .RE
472 472
473 473 .sp
474 474 .ne 2
475 475 .na
476 476 \fB\fB-i\fR\fR
477 477 .ad
478 478 .sp .6
479 479 .RS 4n
480 480 Ignores \fBLD_LIBRARY_PATH\fR. This option is useful when an
481 481 \fBLD_LIBRARY_PATH\fR setting is in effect to influence the runtime library
482 482 search, which would interfere with the link-editing being performed.
483 483 .RE
484 484
485 485 .sp
486 486 .ne 2
487 487 .na
488 488 \fB\fB-I\fR \fIname\fR\fR
489 489 .ad
490 490 .br
491 491 .na
492 492 \fB\fB--dynamic-linker\fR \fIname\fR\fR
493 493 .ad
494 494 .sp .6
495 495 .RS 4n
496 496 When building an executable, uses \fIname\fR as the path name of the
497 497 interpreter to be written into the program header. The default in static mode
498 498 is no interpreter. In dynamic mode, the default is the name of the runtime
499 499 linker, \fBld.so.1\fR(1). Either case can be overridden by \fB-I\fR \fIname\fR.
500 500 \fBexec\fR(2) loads this interpreter when the \fBa.out\fR is loaded, and passes
501 501 control to the interpreter rather than to the \fBa.out\fR directly.
502 502 .RE
503 503
504 504 .sp
505 505 .ne 2
506 506 .na
507 507 \fB\fB-l\fR \fIx\fR\fR
508 508 .ad
509 509 .br
510 510 .na
511 511 \fB\fB--library\fR \fIx\fR\fR
512 512 .ad
513 513 .sp .6
514 514 .RS 4n
515 515 Searches a library \fBlib\fR\fIx\fR\fB\&.so\fR or \fBlib\fR\fIx\fR\fB\&.a\fR,
516 516 the conventional names for shared object and archive libraries, respectively.
517 517 In dynamic mode, unless the \fB-B\fR \fBstatic\fR option is in effect, \fBld\fR
518 518 searches each directory specified in the library search path for a
519 519 \fBlib\fR\fIx\fR\fB\&.so\fR or \fBlib\fR\fIx\fR\fB\&.a\fR file. The directory
520 520 search stops at the first directory containing either. \fBld\fR chooses the
521 521 file ending in \fB\&.so\fR if \fB-l\fR\fIx\fR expands to two files with names
522 522 of the form \fBlib\fR\fIx\fR\fB\&.so\fR and \fBlib\fR\fIx\fR\fB\&.a\fR. If no
523 523 \fBlib\fR\fIx\fR\fB\&.so\fR is found, then \fBld\fR accepts
524 524 \fBlib\fR\fIx\fR\fB\&.a\fR. In static mode, or when the \fB-B\fR \fBstatic\fR
525 525 option is in effect, \fBld\fR selects only the file ending in \fB\&.a\fR.
526 526 \fBld\fR searches a library when the library is encountered, so the placement
527 527 of \fB-l\fR is significant. See \fILinking With Additional Libraries\fR in
528 528 \fILinker and Libraries Guide\fR.
529 529 .RE
530 530
531 531 .sp
532 532 .ne 2
533 533 .na
534 534 \fB\fB-L\fR \fIpath\fR\fR
535 535 .ad
536 536 .br
537 537 .na
538 538 \fB\fB--library-path\fR \fIpath\fR\fR
539 539 .ad
540 540 .sp .6
541 541 .RS 4n
542 542 Adds \fIpath\fR to the library search directories. \fBld\fR searches for
543 543 libraries first in any directories specified by the \fB-L\fR options and then
544 544 in the standard directories. This option is useful only if the option precedes
545 545 the \fB-l\fR options to which the \fB-L\fR option applies. See \fIDirectories
546 546 Searched by the Link-Editor\fR in \fILinker and Libraries Guide\fR.
547 547 .sp
548 548 The environment variable \fBLD_LIBRARY_PATH\fR can be used to supplement the
549 549 library search path, however the \fB-L\fR option is recommended, as the
550 550 environment variable is also interpreted by the runtime environment. See
551 551 \fBLD_LIBRARY_PATH\fR under ENVIRONMENT VARIABLES.
552 552 .RE
553 553
554 554 .sp
555 555 .ne 2
556 556 .na
557 557 \fB\fB-m\fR\fR
558 558 .ad
559 559 .sp .6
560 560 .RS 4n
561 561 Produces a memory map or listing of the input/output sections, together with
562 562 any non-fatal multiply-defined symbols, on the standard output.
563 563 .RE
564 564
565 565 .sp
566 566 .ne 2
567 567 .na
568 568 \fB\fB-M\fR \fImapfile\fR\fR
569 569 .ad
570 570 .sp .6
571 571 .RS 4n
572 572 Reads \fImapfile\fR as a text file of directives to \fBld\fR. This option can
573 573 be specified multiple times. If \fImapfile\fR is a directory, then all regular
574 574 files, as defined by \fBstat\fR(2), within the directory are processed. See
575 575 Chapter 9, \fIMapfile Option,\fR in \fILinker and Libraries Guide\fR. Example
576 576 mapfiles are provided in \fB/usr/lib/ld\fR. See FILES.
577 577 .RE
578 578
579 579 .sp
580 580 .ne 2
581 581 .na
582 582 \fB\fB-N\fR \fIstring\fR\fR
583 583 .ad
584 584 .sp .6
585 585 .RS 4n
586 586 This option causes a \fBDT_NEEDED\fR entry to be added to the \fB\&.dynamic\fR
587 587 section of the object being built. The value of the \fBDT_NEEDED\fR string is
588 588 the \fIstring\fR that is specified on the command line. This option is position
589 589 dependent, and the \fBDT_NEEDED\fR \fB\&.dynamic\fR entry is relative to the
590 590 other dynamic dependencies discovered on the link-edit line. This option is
591 591 useful for specifying dependencies within device driver relocatable objects
592 592 when combined with the \fB-dy\fR and \fB-r\fR options.
593 593 .RE
594 594
595 595 .sp
596 596 .ne 2
597 597 .na
598 598 \fB\fB-o\fR \fIoutfile\fR\fR
599 599 .ad
600 600 .br
601 601 .na
602 602 \fB\fB--output\fR \fIoutfile\fR\fR
603 603 .ad
604 604 .sp .6
605 605 .RS 4n
606 606 Produces an output object file that is named \fIoutfile\fR. The name of the
607 607 default object file is \fBa.out\fR.
608 608 .RE
609 609
610 610 .sp
611 611 .ne 2
612 612 .na
613 613 \fB\fB-p\fR \fIauditlib\fR\fR
614 614 .ad
615 615 .sp .6
616 616 .RS 4n
617 617 Identifies an audit library, \fIauditlib\fR. This audit library is used to
618 618 audit the object being created at runtime. A shared object identified as
619 619 requiring auditing with the \fB-p\fR option, has this requirement inherited by
620 620 any object that specifies the shared object as a dependency. See the \fB-P\fR
621 621 option. See \fIRuntime Linker Auditing Interface\fR in \fILinker and Libraries
622 622 Guide\fR.
623 623 .RE
624 624
625 625 .sp
626 626 .ne 2
627 627 .na
628 628 \fB\fB-P\fR \fIauditlib\fR\fR
629 629 .ad
630 630 .sp .6
631 631 .RS 4n
632 632 Identifies an audit library, \fIauditlib\fR. This audit library is used to
633 633 audit the dependencies of the object being created at runtime. Dependency
634 634 auditing can also be inherited from dependencies that are identified as
635 635 requiring auditing. See the \fB-p\fR option, and the \fB-z\fR \fBglobalaudit\fR
636 636 option. See \fIRuntime Linker Auditing Interface\fR in \fILinker and Libraries
637 637 Guide\fR.
638 638 .RE
639 639
640 640 .sp
641 641 .ne 2
642 642 .na
643 643 \fB\fB-Q\fR \fBy\fR | \fBn\fR\fR
644 644 .ad
645 645 .sp .6
646 646 .RS 4n
647 647 Under \fB-Q\fR \fBy\fR, an \fBident\fR string is added to the \fB\&.comment\fR
648 648 section of the output file. This string identifies the version of the \fBld\fR
649 649 used to create the file. This results in multiple \fBld\fR \fBidents\fR when
650 650 there have been multiple linking steps, such as when using \fBld\fR \fB-r\fR.
651 651 This identification is identical with the default action of the \fBcc\fR
652 652 command. \fB-Q\fR \fBn\fR suppresses version identification. \fB\&.comment\fR
653 653 sections can be manipulated by the \fBmcs\fR(1) utility.
654 654 .RE
655 655
656 656 .sp
657 657 .ne 2
658 658 .na
659 659 \fB\fB-r\fR\fR
660 660 .ad
661 661 .br
662 662 .na
663 663 \fB\fB--relocatable\fR\fR
664 664 .ad
665 665 .sp .6
666 666 .RS 4n
667 667 Combines relocatable object files to produce one relocatable object file.
668 668 \fBld\fR does not complain about unresolved references. This option cannot be
669 669 used with the \fB-a\fR option.
670 670 .RE
671 671
672 672 .sp
673 673 .ne 2
674 674 .na
675 675 \fB\fB-R\fR \fIpath\fR\fR
676 676 .ad
677 677 .br
678 678 .na
679 679 \fB\fB-rpath\fR \fIpath\fR\fR
680 680 .ad
681 681 .sp .6
682 682 .RS 4n
683 683 A colon-separated list of directories used to specify library search
684 684 directories to the runtime linker. If present and not NULL, the path is
685 685 recorded in the output object file and passed to the runtime linker. Multiple
686 686 instances of this option are concatenated together with each \fIpath\fR
687 687 separated by a colon. See \fIDirectories Searched by the Runtime Linker\fR in
688 688 \fILinker and Libraries Guide\fR.
689 689 .sp
690 690 The use of a runpath within an associated object is preferable to setting
691 691 global search paths such as through the \fBLD_LIBRARY_PATH\fR environment
692 692 variable. Only the runpaths that are necessary to find the objects dependencies
693 693 should be recorded. \fBldd\fR(1) can also be used to discover unused runpaths
694 694 in dynamic objects, when used with the \fB-U\fR option.
695 695 .sp
696 696 Various tokens can also be supplied with a runpath that provide a flexible
697 697 means of identifying system capabilities or an objects location. See Appendix
698 698 C, \fIEstablishing Dependencies with Dynamic String Tokens,\fR in \fILinker and
699 699 Libraries Guide\fR. The \fB$ORIGIN\fR token is especially useful in allowing
700 700 dynamic objects to be relocated to different locations in the file system.
701 701 .RE
702 702
703 703 .sp
704 704 .ne 2
705 705 .na
706 706 \fB\fB-s\fR\fR
707 707 .ad
708 708 .br
709 709 .na
710 710 \fB\fB--strip-all\fR\fR
711 711 .ad
712 712 .sp .6
713 713 .RS 4n
714 714 Strips symbolic information from the output file. Any debugging information,
715 715 that is, \fB\&.line\fR, \fB\&.debug*\fR, and \fB\&.stab*\fR sections, and their
716 716 associated relocation entries are removed. Except for relocatable files, a
717 717 symbol table \fBSHT_SYMTAB\fR and its associated string table section are not
718 718 created in the output object file. The elimination of a \fBSHT_SYMTAB\fR symbol
719 719 table can reduce the \fB\&.stab*\fR debugging information that is generated
720 720 using the compiler drivers \fB-g\fR option. See the \fB-z\fR \fBredlocsym\fR
721 721 and \fB-z\fR \fBnoldynsym\fR options.
722 722 .RE
723 723
724 724 .sp
725 725 .ne 2
726 726 .na
727 727 \fB\fB-S\fR \fIsupportlib\fR\fR
728 728 .ad
729 729 .sp .6
730 730 .RS 4n
731 731 The shared object \fIsupportlib\fR is loaded with \fBld\fR and given
732 732 information regarding the linking process. Shared objects that are defined by
733 733 using the \fB-S\fR option can also be supplied using the \fBSGS_SUPPORT\fR
734 734 environment variable. See \fILink-Editor Support Interface\fR in \fILinker and
735 735 Libraries Guide\fR.
736 736 .RE
737 737
738 738 .sp
739 739 .ne 2
740 740 .na
741 741 \fB\fB-t\fR\fR
742 742 .ad
743 743 .sp .6
744 744 .RS 4n
745 745 Turns off the warning for multiply-defined symbols that have different sizes or
746 746 different alignments.
747 747 .RE
748 748
749 749 .sp
750 750 .ne 2
751 751 .na
752 752 \fB\fB-u\fR \fIsymname\fR\fR
753 753 .ad
754 754 .br
755 755 .na
756 756 \fB\fB--undefined\fR \fIsymname\fR\fR
757 757 .ad
758 758 .sp .6
759 759 .RS 4n
760 760 Enters \fIsymname\fR as an undefined symbol in the symbol table. This option is
761 761 useful for loading entirely from an archive library. In this instance, an
762 762 unresolved reference is needed to force the loading of the first routine. The
763 763 placement of this option on the command line is significant. This option must
764 764 be placed before the library that defines the symbol. See \fIDefining
765 765 Additional Symbols with the u option\fR in \fILinker and Libraries Guide\fR.
766 766 .RE
767 767
768 768 .sp
769 769 .ne 2
770 770 .na
771 771 \fB\fB-V\fR\fR
772 772 .ad
773 773 .br
774 774 .na
775 775 \fB\fB--version\fR\fR
776 776 .ad
777 777 .sp .6
778 778 .RS 4n
779 779 Outputs a message giving information about the version of \fBld\fR being used.
780 780 .RE
781 781
782 782 .sp
783 783 .ne 2
784 784 .na
785 785 \fB\fB-Y\fR \fBP,\fR\fIdirlist\fR\fR
786 786 .ad
787 787 .sp .6
788 788 .RS 4n
789 789 Changes the default directories used for finding libraries. \fIdirlist\fR is a
790 790 colon-separated path list.
791 791 .RE
792 792
793 793 .sp
794 794 .ne 2
795 795 .na
796 796 \fB\fB-z\fR \fBabsexec\fR\fR
797 797 .ad
798 798 .sp .6
799 799 .RS 4n
800 800 Useful only when building a dynamic executable. Specifies that references to
801 801 external absolute symbols should be resolved immediately instead of being left
802 802 for resolution at runtime. In very specialized circumstances, this option
803 803 removes text relocations that can result in excessive swap space demands by an
804 804 executable.
805 805 .RE
806 806
807 807 .sp
808 808 .ne 2
809 809 .na
810 810 \fB\fB-z\fR \fBallextract\fR | \fBdefaultextract\fR | \fBweakextract\fR\fR
811 811 .ad
812 812 .br
813 813 .na
814 814 \fB\fB--whole-archive\fR | \fB--no-whole-archive\fR\fR
815 815 .ad
816 816 .sp .6
817 817 .RS 4n
818 818 Alters the extraction criteria of objects from any archives that follow. By
819 819 default, archive members are extracted to satisfy undefined references and to
820 820 promote tentative definitions with data definitions. Weak symbol references do
821 821 not trigger extraction. Under the \fB-z\fR \fBallextract\fR or
822 822 \fB--whole-archive\fR options, all archive members are extracted from the
823 823 archive. Under \fB-z\fR \fBweakextract\fR, weak references trigger archive
824 824 extraction. The \fB-z\fR \fBdefaultextract\fR or \fB--no-whole-archive\fR
825 825 options provide a means of returning to the default following use of the former
826 826 extract options. See \fIArchive Processing\fR in \fILinker and Libraries
827 827 Guide\fR.
828 828 .RE
829 829
830 830 .sp
831 831 .ne 2
832 832 .na
833 833 \fB\fB-z\fR \fBaltexec64\fR\fR
834 834 .ad
835 835 .sp .6
836 836 .RS 4n
837 837 Execute the 64-bit \fBld\fR. The creation of very large 32-bit objects can
838 838 exhaust the virtual memory that is available to the 32-bit \fBld\fR. The
839 839 \fB-z\fR \fBaltexec64\fR option can be used to force the use of the associated
840 840 64-bit \fBld\fR. The 64-bit \fBld\fR provides a larger virtual address space
841 841 for building 32-bit objects. See \fIThe 32-bit link-editor and 64-bit
842 842 link-editor\fR in \fILinker and Libraries Guide\fR.
843 843 .RE
844 844
845 845 .sp
846 846 .ne 2
847 847 .na
848 848 \fB\fB-z\fR \fBcombreloc\fR | \fBnocombreloc\fR\fR
849 849 .ad
850 850 .sp .6
851 851 .RS 4n
852 852 By default, \fBld\fR combines multiple relocation sections when building
853 853 executables or shared objects. This section combination differs from
854 854 relocatable objects, in which relocation sections are maintained in a
855 855 one-to-one relationship with the sections to which the relocations must be
856 856 applied. The \fB-z\fR \fBnocombreloc\fR option disables this merging of
857 857 relocation sections, and preserves the one-to-one relationship found in the
858 858 original relocatable objects.
859 859 .sp
860 860 \fBld\fR sorts the entries of data relocation sections by their symbol
861 861 reference. This sorting reduces runtime symbol lookup. When multiple relocation
862 862 sections are combined, this sorting produces the least possible relocation
863 863 overhead when objects are loaded into memory, and speeds the runtime loading of
864 864 dynamic objects.
865 865 .sp
866 866 Historically, the individual relocation sections were carried over to any
867 867 executable or shared object, and the \fB-z\fR \fBcombreloc\fR option was
868 868 required to enable the relocation section merging previously described.
869 869 Relocation section merging is now the default. The \fB-z\fR \fBcombreloc\fR
870 870 option is still accepted for the benefit of old build environments, but the
871 871 option is unnecessary, and has no effect.
872 872 .RE
873 873
874 874 .sp
875 875 .ne 2
876 876 .na
877 877 \fB\fB-z\fR \fBassert-deflib\fR\fR
878 878 .ad
879 879 .br
880 880 .na
881 881 \fB\fB-z\fR \fBassert-deflib=\fR\fIlibname\fR\fR
882 882 .ad
883 883 .sp .6
884 884 .RS 4n
885 885 Enables warnings that check the location of where libraries passed in with
886 886 \fB-l\fR are found. If the link-editor finds a library on its default search
887 887 path it will emit a warning. This warning can be made fatal in conjunction with
888 888 the option \fB-z fatal-warnings\fR. Passing \fIlibname\fR white lists a library
889 889 from this check. The library must be the full name of the library, e.g.
890 890 \fIlibc.so\fR. To white list multiple libraries, the \fB-z
891 891 assert-deflib=\fR\fIlibname\fR option can be repeated multiple times. This
892 892 option is useful when trying to build self-contained objects where a referenced
893 893 library might exist in the default system library path and in alternate paths
894 894 specified by \fB-L\fR, but you only want the alternate paths to be used.
895 895 .RE
896 896
897 897 .sp
898 898 .ne 2
899 899 .na
900 900 \fB\fB-z\fR \fBdefs\fR | \fBnodefs\fR\fR
901 901 .ad
902 902 .br
903 903 .na
904 904 \fB\fB--no-undefined\fR\fR
905 905 .ad
906 906 .sp .6
907 907 .RS 4n
908 908 The \fB-z\fR \fBdefs\fR option and the \fB--no-undefined\fR option force a
909 909 fatal error if any undefined symbols remain at the end of the link. This mode
910 910 is the default when an executable is built. For historic reasons, this mode is
911 911 \fBnot\fR the default when building a shared object. Use of the \fB-z\fR
912 912 \fBdefs\fR option is recommended, as this mode assures the object being built
913 913 is self-contained. A self-contained object has all symbolic references resolved
914 914 internally, or to the object's immediate dependencies.
915 915 .sp
916 916 The \fB-z\fR \fBnodefs\fR option allows undefined symbols. For historic
917 917 reasons, this mode is the default when a shared object is built. When used with
918 918 executables, the behavior of references to such undefined symbols is
919 919 unspecified. Use of the \fB-z\fR \fBnodefs\fR option is not recommended.
920 920 .RE
921 921
922 922 .sp
923 923 .ne 2
924 924 .na
925 925 \fB\fB-z\fR \fBdirect\fR | \fBnodirect\fR\fR
926 926 .ad
927 927 .sp .6
928 928 .RS 4n
929 929 Enables or disables direct binding to any dependencies that follow on the
930 930 command line. These options allow finer control over direct binding than the
931 931 global counterpart \fB-B\fR \fBdirect\fR. The \fB-z\fR \fBdirect\fR option also
932 932 differs from the \fB-B\fR \fBdirect\fR option in the following areas. Direct
933 933 binding information is not established between a symbol reference and an
934 934 associated definition within the object being created. Lazy loading is not
935 935 enabled.
936 936 .RE
937 937
938 938 .sp
939 939 .ne 2
940 940 .na
941 941 \fB\fB-z\fR \fBendfiltee\fR\fR
942 942 .ad
943 943 .sp .6
944 944 .RS 4n
945 945 Marks a filtee so that when processed by a filter, the filtee terminates any
946 946 further filtee searches by the filter. See \fIReducing Filtee Searches\fR in
947 947 \fILinker and Libraries Guide\fR.
948 948 .RE
949 949
950 950 .sp
951 951 .ne 2
952 952 .na
953 953 \fB\fB-z\fR \fBfatal-warnings\fR | \fBnofatal-warnings\fR\fR
954 954 .ad
955 955 .br
956 956 .na
957 957 \fB\fB--fatal-warnings\fR | \fB--no-fatal-warnings\fR
958 958 .ad
959 959 .sp .6
960 960 .RS 4n
961 961 Controls the behavior of warnings emitted from the link-editor. Setting \fB-z
962 962 fatal-warnings\fR promotes warnings emitted by the link-editor to fatal errors
963 963 that will cause the link-editor to fail before linking. \fB-z
964 964 nofatal-warnings\fR instead demotes these warnings such that they will not cause
965 965 the link-editor to exit prematurely.
966 966 .RE
967 967
968 968
969 969 .sp
970 970 .ne 2
971 971 .na
972 972 \fB\fB-z\fR \fBfiniarray=\fR\fIfunction\fR\fR
973 973 .ad
974 974 .sp .6
975 975 .RS 4n
976 976 Appends an entry to the \fB\&.finiarray\fR section of the object being built.
977 977 If no \fB\&.finiarray\fR section is present, a section is created. The new
978 978 entry is initialized to point to \fIfunction\fR. See \fIInitialization and
979 979 Termination Sections\fR in \fILinker and Libraries Guide\fR.
980 980 .RE
981 981
982 982 .sp
983 983 .ne 2
984 984 .na
985 985 \fB\fB-z\fR \fBglobalaudit\fR\fR
986 986 .ad
987 987 .sp .6
988 988 .RS 4n
989 989 This option supplements an audit library definition that has been recorded with
990 990 the \fB-P\fR option. This option is only meaningful when building a dynamic
991 991 executable. Audit libraries that are defined within an object with the \fB-P\fR
992 992 option typically allow for the auditing of the immediate dependencies of the
993 993 object. The \fB-z\fR \fBglobalaudit\fR promotes the auditor to a global
994 994 auditor, thus allowing the auditing of all dependencies. See \fIInvoking the
995 995 Auditing Interface\fR in \fILinker and Libraries Guide\fR.
996 996 .sp
997 997 An auditor established with the \fB-P\fR option and the \fB-z\fR
998 998 \fBglobalaudit\fR option, is equivalent to the auditor being established with
999 999 the \fBLD_AUDIT\fR environment variable. See \fBld.so.1\fR(1).
1000 1000 .RE
1001 1001
1002 1002 .sp
1003 1003 .ne 2
1004 1004 .na
1005 1005 \fB\fB-z\fR \fBgroupperm\fR | \fBnogroupperm\fR\fR
1006 1006 .ad
1007 1007 .sp .6
1008 1008 .RS 4n
1009 1009 Assigns, or deassigns each dependency that follows to a unique group. The
1010 1010 assignment of a dependency to a group has the same effect as if the dependency
1011 1011 had been built using the \fB-B\fR \fBgroup\fR option.
1012 1012 .RE
1013 1013
1014 1014 .sp
1015 1015 .ne 2
1016 1016 .na
1017 1017 \fB-z\fR \fBguidance\fR[=\fIid1\fR,\fIid2\fR...]
1018 1018 .ad
1019 1019 .sp .6
1020 1020 .RS 4n
1021 1021 Give messages suggesting link-editor features that could improve the resulting
1022 1022 dynamic object.
1023 1023 .LP
1024 1024 Specific classes of suggestion can be silenced by specifying an optional comma separated
1025 1025 list of guidance identifiers.
1026 1026 .LP
1027 1027 The current classes of suggestion provided are:
1028 1028
1029 1029 .sp
1030 1030 .ne 2
1031 1031 .na
1032 1032 Enable use of direct binding
1033 1033 .ad
1034 1034 .sp .6
1035 1035 .RS 4n
1036 1036 Suggests that \fB-z direct\fR or \fB-B direct\fR be present prior to any
1037 1037 specified dependency. This allows predictable symbol binding at runtime.
1038 1038
1039 1039 Can be disabled with \fB-z guidance=nodirect\fR
1040 1040 .RE
1041 1041
1042 1042 .sp
1043 1043 .ne 2
1044 1044 .na
1045 1045 Enable lazy dependency loading
1046 1046 .ad
1047 1047 .sp .6
1048 1048 .RS 4n
1049 1049 Suggests that \fB-z lazyload\fR be present prior to any specified dependency.
1050 1050 This allows the dynamic object to be loaded more quickly.
1051 1051
1052 1052 Can be disabled with \fB-z guidance=nolazyload\fR.
1053 1053 .RE
1054 1054
1055 1055 .sp
1056 1056 .ne 2
1057 1057 .na
1058 1058 Shared objects should define all their dependencies.
1059 1059 .ad
1060 1060 .sp .6
1061 1061 .RS 4n
1062 1062 Suggests that \fB-z defs\fR be specified on the link-editor command line.
1063 1063 Shared objects that explicitly state all their dependencies behave more
1064 1064 predictably when used.
1065 1065
1066 1066 Can be be disabled with \fB-z guidance=nodefs\fR
1067 1067 .RE
1068 1068
1069 1069 .sp
1070 1070 .ne 2
1071 1071 .na
1072 1072 Version 2 mapfile syntax
1073 1073 .ad
1074 1074 .sp .6
1075 1075 .RS 4n
1076 1076 Suggests that any specified mapfiles use the more readable version 2 syntax.
1077 1077
1078 1078 Can be disabled with \fB-z guidance=nomapfile\fR.
1079 1079 .RE
1080 1080
1081 1081 .sp
1082 1082 .ne 2
1083 1083 .na
1084 1084 Read-only text segment
1085 1085 .ad
1086 1086 .sp .6
1087 1087 .RS 4n
1088 1088 Should any runtime relocations within the text segment exist, suggests that
1089 1089 the object be compiled with position independent code (PIC). Keeping large
1090 1090 allocatable sections read-only allows them to be shared between processes
1091 1091 using a given shared object.
1092 1092
1093 1093 Can be disabled with \fB-z guidance=notext\fR
1094 1094 .RE
1095 1095
1096 1096 .sp
1097 1097 .ne 2
1098 1098 .na
1099 1099 No unused dependencies
1100 1100 .ad
1101 1101 .sp .6
1102 1102 .RS 4n
1103 1103 Suggests that any dependency not referenced by the resulting dynamic object be
1104 1104 removed from the link-editor command line.
1105 1105
1106 1106 Can be disabled with \fB-z guidance=nounused\fR.
1107 1107 .RE
1108 1108 .RE
1109 1109
1110 1110 .sp
1111 1111 .ne 2
1112 1112 .na
1113 1113 \fB\fB-z\fR \fBhelp\fR\fR
1114 1114 .ad
1115 1115 .br
1116 1116 .na
1117 1117 \fB\fB--help\fR\fR
1118 1118 .ad
|
↓ open down ↓ |
1118 lines elided |
↑ open up ↑ |
1119 1119 .sp .6
1120 1120 .RS 4n
1121 1121 Print a summary of the command line options on the standard output and exit.
1122 1122 .RE
1123 1123
1124 1124 .sp
1125 1125 .ne 2
1126 1126 .na
1127 1127 \fB\fB-z\fR \fBignore\fR | \fBrecord\fR\fR
1128 1128 .ad
1129 +.br
1130 +.na
1131 +\fB\fB--as-needed\fR | \fB--no-as-needed\fR\fR
1132 +.ad
1129 1133 .sp .6
1130 1134 .RS 4n
1131 1135 Ignores, or records, dynamic dependencies that are not referenced as part of
1132 1136 the link-edit. Ignores, or records, unreferenced \fBELF\fR sections from the
1133 1137 relocatable objects that are read as part of the link-edit. By default,
1134 1138 \fB-z\fR \fBrecord\fR is in effect.
1135 1139 .sp
1136 1140 If an \fBELF\fR section is ignored, the section is eliminated from the output
1137 1141 file being generated. A section is ignored when three conditions are true. The
1138 1142 eliminated section must contribute to an allocatable segment. The eliminated
1139 1143 section must provide no global symbols. No other section from any object that
1140 1144 contributes to the link-edit, must reference an eliminated section.
1141 1145 .RE
1142 1146
1143 1147 .sp
1144 1148 .ne 2
1145 1149 .na
1146 1150 \fB\fB-z\fR \fBinitarray=\fR\fIfunction\fR\fR
1147 1151 .ad
1148 1152 .sp .6
1149 1153 .RS 4n
1150 1154 Appends an entry to the \fB\&.initarray\fR section of the object being built.
1151 1155 If no \fB\&.initarray\fR section is present, a section is created. The new
1152 1156 entry is initialized to point to \fIfunction\fR. See \fIInitialization and
1153 1157 Termination Sections\fR in \fILinker and Libraries Guide\fR.
1154 1158 .RE
1155 1159
1156 1160 .sp
1157 1161 .ne 2
1158 1162 .na
1159 1163 \fB\fB-z\fR \fBinitfirst\fR\fR
1160 1164 .ad
1161 1165 .sp .6
1162 1166 .RS 4n
1163 1167 Marks the object so that its runtime initialization occurs before the runtime
1164 1168 initialization of any other objects brought into the process at the same time.
1165 1169 In addition, the object runtime finalization occurs after the runtime
1166 1170 finalization of any other objects removed from the process at the same time.
1167 1171 This option is only meaningful when building a shared object.
1168 1172 .RE
1169 1173
1170 1174 .sp
1171 1175 .ne 2
1172 1176 .na
1173 1177 \fB\fB-z\fR \fBinterpose\fR\fR
1174 1178 .ad
1175 1179 .sp .6
1176 1180 .RS 4n
1177 1181 Marks the object as an interposer. At runtime, an object is identified as an
1178 1182 explicit interposer if the object has been tagged using the \fB-z interpose\fR
1179 1183 option. An explicit interposer is also established when an object is loaded
1180 1184 using the \fBLD_PRELOAD\fR environment variable. Implicit interposition can
1181 1185 occur because of the load order of objects, however, this implicit
1182 1186 interposition is unknown to the runtime linker. Explicit interposition can
1183 1187 ensure that interposition takes place regardless of the order in which objects
1184 1188 are loaded. Explicit interposition also ensures that the runtime linker
1185 1189 searches for symbols in any explicit interposers when direct bindings are in
1186 1190 effect.
1187 1191 .RE
1188 1192
1189 1193 .sp
1190 1194 .ne 2
1191 1195 .na
1192 1196 \fB\fB-z\fR \fBlazyload\fR | \fBnolazyload\fR\fR
1193 1197 .ad
1194 1198 .sp .6
1195 1199 .RS 4n
1196 1200 Enables or disables the marking of dynamic dependencies to be lazily loaded.
1197 1201 Dynamic dependencies which are marked \fBlazyload\fR are not loaded at initial
1198 1202 process start-up. These dependencies are delayed until the first binding to the
1199 1203 object is made. \fBNote:\fR Lazy loading requires the correct declaration of
1200 1204 dependencies, together with associated runpaths for each dynamic object used
1201 1205 within a process. See \fILazy Loading of Dynamic Dependencies\fR in \fILinker
1202 1206 and Libraries Guide\fR.
1203 1207 .RE
1204 1208
1205 1209 .sp
1206 1210 .ne 2
1207 1211 .na
1208 1212 \fB\fB-z\fR \fBld32\fR=\fIarg1\fR,\fIarg2\fR,...\fR
1209 1213 .ad
1210 1214 .br
1211 1215 .na
1212 1216 \fB\fB-z\fR \fBld64\fR=\fIarg1\fR,\fIarg2\fR,...\fR
1213 1217 .ad
1214 1218 .sp .6
1215 1219 .RS 4n
1216 1220 The class of the link-editor is affected by the class of the output file being
1217 1221 created and by the capabilities of the underlying operating system. The
1218 1222 \fB-z\fR \fBld\fR[\fB32\fR|\fB64\fR] options provide a means of defining any
1219 1223 link-editor argument. The defined argument is only interpreted, respectively,
1220 1224 by the 32-bit class or 64-bit class of the link-editor.
1221 1225 .sp
1222 1226 For example, support libraries are class specific, so the correct class of
1223 1227 support library can be ensured using:
1224 1228 .sp
1225 1229 .in +2
1226 1230 .nf
1227 1231 \fBld ... -z ld32=-Saudit32.so.1 -z ld64=-Saudit64.so.1 ...\fR
1228 1232 .fi
1229 1233 .in -2
1230 1234 .sp
1231 1235
1232 1236 The class of link-editor that is invoked is determined from the \fBELF\fR class
1233 1237 of the first relocatable file that is seen on the command line. This
1234 1238 determination is carried out \fBprior\fR to any \fB-z\fR
1235 1239 \fBld\fR[\fB32\fR|\fB64\fR] processing.
1236 1240 .RE
1237 1241
1238 1242 .sp
1239 1243 .ne 2
1240 1244 .na
1241 1245 \fB\fB-z\fR \fBloadfltr\fR\fR
1242 1246 .ad
1243 1247 .sp .6
1244 1248 .RS 4n
1245 1249 Marks a filter to indicate that filtees must be processed immediately at
1246 1250 runtime. Normally, filter processing is delayed until a symbol reference is
1247 1251 bound to the filter. The runtime processing of an object that contains this
1248 1252 flag mimics that which occurs if the \fBLD_LOADFLTR\fR environment variable is
1249 1253 in effect. See the \fBld.so.1\fR(1).
1250 1254 .RE
1251 1255
1252 1256 .sp
1253 1257 .ne 2
1254 1258 .na
1255 1259 \fB\fB-z\fR \fBmuldefs\fR\fR
1256 1260 .ad
1257 1261 .br
1258 1262 .na
1259 1263 \fB\fB--allow-multiple-definition\fR\fR
1260 1264 .ad
1261 1265 .sp .6
1262 1266 .RS 4n
1263 1267 Allows multiple symbol definitions. By default, multiple symbol definitions
1264 1268 that occur between relocatable objects result in a fatal error condition. This
1265 1269 option, suppresses the error condition, allowing the first symbol definition to
1266 1270 be taken.
1267 1271 .RE
1268 1272
1269 1273 .sp
1270 1274 .ne 2
1271 1275 .na
1272 1276 \fB\fB-z\fR \fBnocompstrtab\fR\fR
1273 1277 .ad
1274 1278 .sp .6
1275 1279 .RS 4n
1276 1280 Disables the compression of \fBELF\fR string tables. By default, string
1277 1281 compression is applied to \fBSHT_STRTAB\fR sections, and to \fBSHT_PROGBITS\fR
1278 1282 sections that have their \fBSHF_MERGE\fR and \fBSHF_STRINGS\fR section flags
1279 1283 set.
1280 1284 .RE
1281 1285
1282 1286 .sp
1283 1287 .ne 2
1284 1288 .na
1285 1289 \fB\fB-z\fR \fBnodefaultlib\fR\fR
1286 1290 .ad
1287 1291 .sp .6
1288 1292 .RS 4n
1289 1293 Marks the object so that the runtime default library search path, used after
1290 1294 any \fBLD_LIBRARY_PATH\fR or runpaths, is ignored. This option implies that all
1291 1295 dependencies of the object can be satisfied from its runpath.
1292 1296 .RE
1293 1297
1294 1298 .sp
1295 1299 .ne 2
1296 1300 .na
1297 1301 \fB\fB-z\fR \fBnodelete\fR\fR
1298 1302 .ad
1299 1303 .sp .6
1300 1304 .RS 4n
1301 1305 Marks the object as non-deletable at runtime. This mode is similar to adding
1302 1306 the object to the process by using \fBdlopen\fR(3C) with the
1303 1307 \fBRTLD_NODELETE\fR mode.
1304 1308 .RE
1305 1309
1306 1310 .sp
1307 1311 .ne 2
1308 1312 .na
1309 1313 \fB\fB-z\fR \fBnodlopen\fR\fR
1310 1314 .ad
1311 1315 .sp .6
1312 1316 .RS 4n
1313 1317 Marks the object as not available to \fBdlopen\fR(3C), either as the object
1314 1318 specified by the \fBdlopen()\fR, or as any form of dependency required by the
1315 1319 object specified by the \fBdlopen()\fR. This option is only meaningful when
1316 1320 building a shared object.
1317 1321 .RE
1318 1322
1319 1323 .sp
1320 1324 .ne 2
1321 1325 .na
1322 1326 \fB\fB-z\fR \fBnodump\fR\fR
1323 1327 .ad
1324 1328 .sp .6
1325 1329 .RS 4n
1326 1330 Marks the object as not available to \fBdldump\fR(3C).
1327 1331 .RE
1328 1332
1329 1333 .sp
1330 1334 .ne 2
1331 1335 .na
1332 1336 \fB\fB-z\fR \fBnoldynsym\fR\fR
1333 1337 .ad
1334 1338 .sp .6
1335 1339 .RS 4n
1336 1340 Prevents the inclusion of a \fB\&.SUNW_ldynsym\fR section in dynamic
1337 1341 executables or sharable libraries. The \fB\&.SUNW_ldynsym\fR section augments
1338 1342 the \fB\&.dynsym\fR section by providing symbols for local functions. Local
1339 1343 function symbols allow debuggers to display local function names in stack
1340 1344 traces from stripped programs. Similarly, \fBdladdr\fR(3C) is able to supply
1341 1345 more accurate results.
1342 1346 .sp
1343 1347 The \fB-z\fR \fBnoldynsym\fR option also prevents the inclusion of the two
1344 1348 symbol sort sections that are related to the \fB\&.SUNW_ldynsym\fR section. The
1345 1349 \fB\&.SUNW_dynsymsort\fR section provides sorted access to regular function and
1346 1350 variable symbols. The \fB\&.SUNW_dyntlssort\fR section provides sorted access
1347 1351 to thread local storage (\fBTLS\fR) variable symbols.
1348 1352 .sp
1349 1353 The \fB\&.SUNW_ldynsym\fR, \fB\&.SUNW_dynsymsort\fR, and
1350 1354 \fB\&.SUNW_dyntlssort\fR sections, which becomes part of the allocable text
1351 1355 segment of the resulting file, cannot be removed by \fBstrip\fR(1). Therefore,
1352 1356 the \fB-z\fR \fBnoldynsym\fR option is the only way to prevent their inclusion.
1353 1357 See the \fB-s\fR and \fB-z\fR \fBredlocsym\fR options.
1354 1358 .RE
1355 1359
1356 1360 .sp
1357 1361 .ne 2
1358 1362 .na
1359 1363 \fB\fB-z\fR \fBnopartial\fR\fR
1360 1364 .ad
1361 1365 .sp .6
1362 1366 .RS 4n
1363 1367 Partially initialized symbols, that are defined within relocatable object
1364 1368 files, are expanded in the output file being generated.
1365 1369 .RE
1366 1370
1367 1371 .sp
1368 1372 .ne 2
1369 1373 .na
1370 1374 \fB\fB-z\fR \fBnoversion\fR\fR
1371 1375 .ad
1372 1376 .sp .6
1373 1377 .RS 4n
1374 1378 Does not record any versioning sections. Any version sections or associated
1375 1379 \fB\&.dynamic\fR section entries are not generated in the output image.
1376 1380 .RE
1377 1381
1378 1382 .sp
1379 1383 .ne 2
1380 1384 .na
1381 1385 \fB\fB-z\fR \fBnow\fR\fR
1382 1386 .ad
1383 1387 .sp .6
1384 1388 .RS 4n
1385 1389 Marks the object as requiring non-lazy runtime binding. This mode is similar to
1386 1390 adding the object to the process by using \fBdlopen\fR(3C) with the
1387 1391 \fBRTLD_NOW\fR mode. This mode is also similar to having the \fBLD_BIND_NOW\fR
1388 1392 environment variable in effect. See \fBld.so.1\fR(1).
1389 1393 .RE
1390 1394
1391 1395 .sp
1392 1396 .ne 2
1393 1397 .na
1394 1398 \fB\fB-z\fR \fBorigin\fR\fR
1395 1399 .ad
1396 1400 .sp .6
1397 1401 .RS 4n
1398 1402 Marks the object as requiring immediate \fB$ORIGIN\fR processing at runtime.
1399 1403 This option is only maintained for historic compatibility, as the runtime
1400 1404 analysis of objects to provide for \fB$ORIGIN\fR processing is now default.
1401 1405 .RE
1402 1406
1403 1407 .sp
1404 1408 .ne 2
1405 1409 .na
1406 1410 \fB\fB-z\fR \fBpreinitarray=\fR\fIfunction\fR\fR
1407 1411 .ad
1408 1412 .sp .6
1409 1413 .RS 4n
1410 1414 Appends an entry to the \fB\&.preinitarray\fR section of the object being
1411 1415 built. If no \fB\&.preinitarray\fR section is present, a section is created.
1412 1416 The new entry is initialized to point to \fIfunction\fR. See \fIInitialization
1413 1417 and Termination Sections\fR in \fILinker and Libraries Guide\fR.
1414 1418 .RE
1415 1419
1416 1420 .sp
1417 1421 .ne 2
1418 1422 .na
1419 1423 \fB\fB-z\fR \fBredlocsym\fR\fR
1420 1424 .ad
1421 1425 .sp .6
1422 1426 .RS 4n
1423 1427 Eliminates all local symbols except for the \fISECT\fR symbols from the symbol
1424 1428 table \fBSHT_SYMTAB\fR. All relocations that refer to local symbols are updated
1425 1429 to refer to the corresponding \fISECT\fR symbol. This option allows specialized
1426 1430 objects to greatly reduce their symbol table sizes. Eliminated local symbols
1427 1431 can reduce the \fB\&.stab*\fR debugging information that is generated using the
1428 1432 compiler drivers \fB-g\fR option. See the \fB-s\fR and \fB-z\fR \fBnoldynsym\fR
1429 1433 options.
1430 1434 .RE
1431 1435
1432 1436 .sp
1433 1437 .ne 2
1434 1438 .na
1435 1439 \fB\fB-z\fR \fBrelaxreloc\fR\fR
1436 1440 .ad
1437 1441 .sp .6
1438 1442 .RS 4n
1439 1443 \fBld\fR normally issues a fatal error upon encountering a relocation using a
1440 1444 symbol that references an eliminated COMDAT section. If \fB-z\fR
1441 1445 \fBrelaxreloc\fR is enabled, \fBld\fR instead redirects such relocations to the
1442 1446 equivalent symbol in the COMDAT section that was kept. \fB-z\fR
1443 1447 \fBrelaxreloc\fR is a specialized option, mainly of interest to compiler
1444 1448 authors, and is not intended for general use.
1445 1449 .RE
1446 1450
1447 1451 .sp
1448 1452 .ne 2
1449 1453 .na
1450 1454 \fB\fB-z\fR \fBrescan-now\fR\fR
1451 1455 .ad
1452 1456 .br
1453 1457 .na
1454 1458 \fB\fB-z\fR \fBrescan\fR\fR
1455 1459 .ad
1456 1460 .sp .6
1457 1461 .RS 4n
1458 1462 These options rescan the archive files that are provided to the link-edit. By
1459 1463 default, archives are processed once as the archives appear on the command
1460 1464 line. Archives are traditionally specified at the end of the command line so
1461 1465 that their symbol definitions resolve any preceding references. However,
1462 1466 specifying archives multiple times to satisfy their own interdependencies can
1463 1467 be necessary.
1464 1468 .sp
1465 1469 \fB-z\fR \fBrescan-now\fR is a positional option, and is processed by the
1466 1470 link-editor immediately when encountered on the command line. All archives seen
1467 1471 on the command line up to that point are immediately reprocessed in an attempt
1468 1472 to locate additional archive members that resolve symbol references. This
1469 1473 archive rescanning is repeated until a pass over the archives occurs in which
1470 1474 no new members are extracted.
1471 1475 .sp
1472 1476 \fB-z\fR \fBrescan\fR is a position independent option. The link-editor defers
1473 1477 the rescan operation until after it has processed the entire command line, and
1474 1478 then initiates a final rescan operation over all archives seen on the command
1475 1479 line. The \fB-z\fR \fBrescan\fR operation can interact incorrectly
1476 1480 with objects that contain initialization (.init) or finalization (.fini)
1477 1481 sections, preventing the code in those sections from running. For this reason,
1478 1482 \fB-z\fR \fBrescan\fR is deprecated, and use of \fB-z\fR \fBrescan-now\fR is
1479 1483 advised.
1480 1484 .RE
1481 1485
1482 1486 .sp
1483 1487 .ne 2
1484 1488 .na
1485 1489 \fB\fB-z\fR \fBrescan-start\fR ... \fB-z\fR \fBrescan-end\fR\fR
1486 1490 .ad
1487 1491 .br
1488 1492 .na
1489 1493 \fB\fB--start-group\fR ... \fB--end-group\fR\fR
1490 1494 .ad
1491 1495 .br
1492 1496 .na
1493 1497 \fB\fB-(\fR ... \fB-)\fR\fR
1494 1498 .ad
1495 1499 .sp .6
1496 1500 .RS 4n
1497 1501 Defines an archive rescan group. This is a positional construct, and is
1498 1502 processed by the link-editor immediately upon encountering the closing
1499 1503 delimiter option. Archives found within the group delimiter options are
1500 1504 reprocessed as a group in an attempt to locate additional archive members that
1501 1505 resolve symbol references. This archive rescanning is repeated until a pass
1502 1506 over the archives On the occurs in which no new members are extracted.
1503 1507 Archive rescan groups cannot be nested.
1504 1508 .RE
1505 1509
1506 1510 .sp
1507 1511 .ne 2
1508 1512 .na
1509 1513 \fB\fB-z\fR \fBtarget=sparc|x86\fR \fI\fR\fR
1510 1514 .ad
1511 1515 .sp .6
1512 1516 .RS 4n
1513 1517 Specifies the machine type for the output object. Supported targets are Sparc
1514 1518 and x86. The 32-bit machine type for the specified target is used unless the
1515 1519 \fB-64\fR option is also present, in which case the corresponding 64-bit
1516 1520 machine type is used. By default, the machine type of the object being
1517 1521 generated is determined from the first \fBELF\fR object processed from the
1518 1522 command line. If no objects are specified, the machine type is determined by
1519 1523 the first object encountered within the first archive processed from the
1520 1524 command line. If there are no objects or archives, the link-editor assumes the
1521 1525 native machine. This option is useful when creating an object directly with
1522 1526 \fBld\fR whose input is solely from a \fBmapfile\fR. See the \fB-M\fR option.
1523 1527 It can also be useful in the rare case of linking entirely from an archive that
1524 1528 contains objects of different machine types for which the first object is not
1525 1529 of the desired machine type. See \fIThe 32-bit link-editor and 64-bit
1526 1530 link-editor\fR in \fILinker and Libraries Guide\fR.
1527 1531 .RE
1528 1532
1529 1533 .sp
1530 1534 .ne 2
1531 1535 .na
1532 1536 \fB\fB-z\fR \fBtext\fR\fR
1533 1537 .ad
1534 1538 .sp .6
1535 1539 .RS 4n
1536 1540 In dynamic mode only, forces a fatal error if any relocations against
1537 1541 non-writable, allocatable sections remain. For historic reasons, this mode is
1538 1542 not the default when building an executable or shared object. However, its use
1539 1543 is recommended to ensure that the text segment of the dynamic object being
1540 1544 built is shareable between multiple running processes. A shared text segment
1541 1545 incurs the least relocation overhead when loaded into memory. See
1542 1546 \fIPosition-Independent Code\fR in \fILinker and Libraries Guide\fR.
1543 1547 .RE
1544 1548
1545 1549 .sp
1546 1550 .ne 2
1547 1551 .na
1548 1552 \fB\fB-z\fR \fBtextoff\fR\fR
1549 1553 .ad
1550 1554 .sp .6
1551 1555 .RS 4n
1552 1556 In dynamic mode only, allows relocations against all allocatable sections,
1553 1557 including non-writable ones. This mode is the default when building a shared
1554 1558 object.
1555 1559 .RE
1556 1560
1557 1561 .sp
1558 1562 .ne 2
1559 1563 .na
1560 1564 \fB\fB-z\fR \fBtextwarn\fR\fR
1561 1565 .ad
1562 1566 .sp .6
1563 1567 .RS 4n
1564 1568 In dynamic mode only, lists a warning if any relocations against non-writable,
1565 1569 allocatable sections remain. This mode is the default when building an
1566 1570 executable.
1567 1571 .RE
1568 1572
1569 1573 .sp
1570 1574 .ne 2
1571 1575 .na
1572 1576 \fB\fB-z\fR \fBverbose\fR\fR
1573 1577 .ad
1574 1578 .sp .6
1575 1579 .RS 4n
1576 1580 This option provides additional warning diagnostics during a link-edit.
1577 1581 Presently, this option conveys suspicious use of displacement relocations. This
1578 1582 option also conveys the restricted use of static \fBTLS\fR relocations when
1579 1583 building shared objects. In future, this option might be enhanced to provide
1580 1584 additional diagnostics that are deemed too noisy to be generated by default.
1581 1585 .RE
1582 1586
1583 1587 .sp
1584 1588 .ne 2
1585 1589 .na
1586 1590 \fB\fB-z\fR\fBwrap=\fR\fIsymbol\fR\fR
1587 1591 .ad
1588 1592 .br
1589 1593 .na
1590 1594 \fB\fB-wrap=\fR \fIsymbol\fR\fR
1591 1595 .ad
1592 1596 .br
1593 1597 .na
1594 1598 \fB\fB--wrap=\fR \fIsymbol\fR\fR
1595 1599 .ad
1596 1600 .sp .6
1597 1601 .RS 4n
1598 1602 Rename undefined references to \fIsymbol\fR in order to allow wrapper code to
1599 1603 be linked into the output object without having to modify source code. When
1600 1604 \fB-z wrap\fR is specified, all undefined references to \fIsymbol\fR are
1601 1605 modified to reference \fB__wrap_\fR\fIsymbol\fR, and all references to
1602 1606 \fB__real_\fR\fIsymbol\fR are modified to reference \fIsymbol\fR. The user is
1603 1607 expected to provide an object containing the \fB__wrap_\fR\fIsymbol\fR
1604 1608 function. This wrapper function can call \fB__real_\fR\fIsymbol\fR in order to
1605 1609 reference the actual function being wrapped.
1606 1610 .sp
1607 1611 The following is an example of a wrapper for the \fBmalloc\fR(3C) function:
1608 1612 .sp
1609 1613 .in +2
1610 1614 .nf
1611 1615 void *
1612 1616 __wrap_malloc(size_t c)
1613 1617 {
1614 1618 (void) printf("malloc called with %zu\en", c);
1615 1619 return (__real_malloc(c));
1616 1620 }
1617 1621 .fi
1618 1622 .in -2
1619 1623
1620 1624 If you link other code with this file using \fB-z\fR \fBwrap=malloc\fR to
1621 1625 compile all the objects, then all calls to \fBmalloc\fR will call the function
1622 1626 \fB__wrap_malloc\fR instead. The call to \fB__real_malloc\fR will call the real
1623 1627 \fBmalloc\fR function.
1624 1628 .sp
1625 1629 The real and wrapped functions should be maintained in separate source files.
1626 1630 Otherwise, the compiler or assembler may resolve the call instead of leaving
1627 1631 that operation for the link-editor to carry out, and prevent the wrap from
1628 1632 occurring.
1629 1633 .RE
1630 1634
1631 1635 .SH ENVIRONMENT VARIABLES
1632 1636 .sp
1633 1637 .ne 2
1634 1638 .na
1635 1639 \fB\fBLD_ALTEXEC\fR\fR
1636 1640 .ad
1637 1641 .sp .6
1638 1642 .RS 4n
1639 1643 An alternative link-editor path name. \fBld\fR executes, and passes control to
1640 1644 this alternative link-editor. This environment variable provides a generic
1641 1645 means of overriding the default link-editor that is called from the various
1642 1646 compiler drivers. See the \fB-z altexec64\fR option.
1643 1647 .RE
1644 1648
1645 1649 .sp
1646 1650 .ne 2
1647 1651 .na
1648 1652 \fB\fBLD_LIBRARY_PATH\fR\fR
1649 1653 .ad
1650 1654 .sp .6
1651 1655 .RS 4n
1652 1656 A list of directories in which to search for the libraries specified using the
1653 1657 \fB-l\fR option. Multiple directories are separated by a colon. In the most
1654 1658 general case, this environment variable contains two directory lists separated
1655 1659 by a semicolon:
1656 1660 .sp
1657 1661 .in +2
1658 1662 .nf
1659 1663 \fIdirlist1\fR\fB;\fR\fIdirlist2\fR
1660 1664 .fi
1661 1665 .in -2
1662 1666 .sp
1663 1667
1664 1668 If \fBld\fR is called with any number of occurrences of \fB-L\fR, as in:
1665 1669 .sp
1666 1670 .in +2
1667 1671 .nf
1668 1672 \fBld ... -L\fIpath1\fR ... -L\fIpathn\fR ...\fR
1669 1673 .fi
1670 1674 .in -2
1671 1675 .sp
1672 1676
1673 1677 then the search path ordering is:
1674 1678 .sp
1675 1679 .in +2
1676 1680 .nf
1677 1681 \fB\fIdirlist1 path1\fR ... \fIpathn dirlist2\fR LIBPATH\fR
1678 1682 .fi
1679 1683 .in -2
1680 1684 .sp
1681 1685
1682 1686 When the list of directories does not contain a semicolon, the list is
1683 1687 interpreted as \fIdirlist2\fR.
1684 1688 .sp
1685 1689 The \fBLD_LIBRARY_PATH\fR environment variable also affects the runtime linkers
1686 1690 search for dynamic dependencies.
1687 1691 .sp
1688 1692 This environment variable can be specified with a _32 or _64 suffix. This makes
1689 1693 the environment variable specific, respectively, to 32-bit or 64-bit processes
1690 1694 and overrides any non-suffixed version of the environment variable that is in
1691 1695 effect.
1692 1696 .RE
1693 1697
1694 1698 .sp
1695 1699 .ne 2
1696 1700 .na
1697 1701 \fB\fBLD_NOEXEC_64\fR\fR
1698 1702 .ad
1699 1703 .sp .6
1700 1704 .RS 4n
1701 1705 Suppresses the automatic execution of the 64-bit link-editor. By default, the
1702 1706 link-editor executes the 64-bit version when the \fBELF\fR class of the first
1703 1707 relocatable file identifies a 64-bit object. The 64-bit image that a 32-bit
1704 1708 link-editor can create, has some limitations. However, some link-edits might
1705 1709 find the use of the 32-bit link-editor faster.
1706 1710 .RE
1707 1711
1708 1712 .sp
1709 1713 .ne 2
1710 1714 .na
1711 1715 \fB\fBLD_OPTIONS\fR\fR
1712 1716 .ad
1713 1717 .sp .6
1714 1718 .RS 4n
1715 1719 A default set of options to \fBld\fR. \fBLD_OPTIONS\fR is interpreted by
1716 1720 \fBld\fR just as though its value had been placed on the command line,
1717 1721 immediately following the name used to invoke \fBld\fR, as in:
1718 1722 .sp
1719 1723 .in +2
1720 1724 .nf
1721 1725 \fBld $LD_OPTIONS ... \fIother-arguments\fR ...\fR
1722 1726 .fi
1723 1727 .in -2
1724 1728 .sp
1725 1729
1726 1730 .RE
1727 1731
1728 1732 .sp
1729 1733 .ne 2
1730 1734 .na
1731 1735 \fB\fBLD_RUN_PATH\fR\fR
1732 1736 .ad
1733 1737 .sp .6
1734 1738 .RS 4n
1735 1739 An alternative mechanism for specifying a runpath to the link-editor. See the
1736 1740 \fB-R\fR option. If both \fBLD_RUN_PATH\fR and the \fB-R\fR option are
1737 1741 specified, \fB-R\fR supersedes.
1738 1742 .RE
1739 1743
1740 1744 .sp
1741 1745 .ne 2
1742 1746 .na
1743 1747 \fB\fBSGS_SUPPORT\fR\fR
1744 1748 .ad
1745 1749 .sp .6
1746 1750 .RS 4n
1747 1751 Provides a colon-separated list of shared objects that are loaded with the
1748 1752 link-editor and given information regarding the linking process. This
1749 1753 environment variable can be specified with a _32 or _64 suffix. This makes the
1750 1754 environment variable specific, respectively, to the 32-bit or 64-bit class of
1751 1755 \fBld\fR and overrides any non-suffixed version of the environment variable
1752 1756 that is in effect. See the \fB-S\fR option.
1753 1757 .RE
1754 1758
1755 1759 .sp
1756 1760 .LP
1757 1761 Notice that environment variable-names that begin with the
1758 1762 characters '\fBLD_\fR' are reserved for possible future enhancements to \fBld\fR and
1759 1763 \fBld.so.1\fR(1).
1760 1764 .SH FILES
1761 1765 .sp
1762 1766 .ne 2
1763 1767 .na
1764 1768 \fB\fBlib\fIx\fR.so\fR\fR
1765 1769 .ad
1766 1770 .RS 15n
1767 1771 shared object libraries.
1768 1772 .RE
1769 1773
1770 1774 .sp
1771 1775 .ne 2
1772 1776 .na
1773 1777 \fB\fBlib\fIx\fR.a\fR\fR
1774 1778 .ad
1775 1779 .RS 15n
1776 1780 archive libraries.
1777 1781 .RE
1778 1782
1779 1783 .sp
1780 1784 .ne 2
1781 1785 .na
1782 1786 \fB\fBa.out\fR\fR
1783 1787 .ad
1784 1788 .RS 15n
1785 1789 default output file.
1786 1790 .RE
1787 1791
1788 1792 .sp
1789 1793 .ne 2
1790 1794 .na
1791 1795 \fB\fILIBPATH\fR\fR
1792 1796 .ad
1793 1797 .RS 15n
1794 1798 For 32-bit libraries, the default search path is \fB/usr/ccs/lib\fR, followed
1795 1799 by \fB/lib\fR, and finally \fB/usr/lib\fR. For 64-bit libraries, the default
1796 1800 search path is \fB/lib/64\fR, followed by \fB/usr/lib/64\fR.
1797 1801 .RE
1798 1802
1799 1803 .sp
1800 1804 .ne 2
1801 1805 .na
1802 1806 \fB\fB/usr/lib/ld\fR\fR
1803 1807 .ad
1804 1808 .RS 15n
1805 1809 A directory containing several \fBmapfiles\fR that can be used during
1806 1810 link-editing. These \fBmapfiles\fR provide various capabilities, such as
1807 1811 defining memory layouts, aligning bss, and defining non-executable stacks.
1808 1812 .RE
1809 1813
1810 1814 .SH ATTRIBUTES
1811 1815 .sp
1812 1816 .LP
1813 1817 See \fBattributes\fR(5) for descriptions of the following attributes:
1814 1818 .sp
1815 1819
1816 1820 .sp
1817 1821 .TS
1818 1822 box;
1819 1823 c | c
1820 1824 l | l .
1821 1825 ATTRIBUTE TYPE ATTRIBUTE VALUE
1822 1826 _
1823 1827 Interface Stability Committed
1824 1828 .TE
1825 1829
1826 1830 .SH SEE ALSO
1827 1831 .sp
1828 1832 .LP
1829 1833 \fBas\fR(1), \fBcrle\fR(1), \fBgprof\fR(1), \fBld.so.1\fR(1), \fBldd\fR(1),
1830 1834 \fBmcs\fR(1), \fBpvs\fR(1), \fBexec\fR(2), \fBstat\fR(2), \fBdlopen\fR(3C),
1831 1835 \fBdldump\fR(3C), \fBelf\fR(3ELF), \fBar.h\fR(3HEAD), \fBa.out\fR(4),
1832 1836 \fBattributes\fR(5)
1833 1837 .sp
1834 1838 .LP
1835 1839 \fILinker and Libraries Guide\fR
1836 1840 .SH NOTES
1837 1841 .sp
1838 1842 .LP
1839 1843 Default options applied by \fBld\fR are maintained for historic reasons. In
1840 1844 today's programming environment, where dynamic objects dominate, alternative
1841 1845 defaults would often make more sense. However, historic defaults must be
1842 1846 maintained to ensure compatibility with existing program development
1843 1847 environments. Historic defaults are called out wherever possible in this
1844 1848 manual. For a description of the current recommended options, see Appendix A,
1845 1849 \fILink-Editor Quick Reference,\fR in \fILinker and Libraries Guide\fR.
1846 1850 .sp
1847 1851 .LP
1848 1852 If the file being created by \fBld\fR already exists, the file is unlinked
1849 1853 after all input files have been processed. A new file with the specified name
1850 1854 is then created. This allows \fBld\fR to create a new version of the file,
1851 1855 while simultaneously allowing existing processes that are accessing the old
1852 1856 file contents to continue running. If the old file has no other links, the disk
1853 1857 space of the removed file is freed when the last process referencing the file
1854 1858 terminates.
1855 1859 .sp
1856 1860 .LP
1857 1861 The behavior of \fBld\fR when the file being created already exists was changed
1858 1862 with \fBSXCE\fR build \fB43\fR. In older versions, the existing file was
1859 1863 rewritten in place, an approach with the potential to corrupt any running
1860 1864 processes that is using the file. This change has an implication for output
1861 1865 files that have multiple hard links in the file system. Previously, all links
1862 1866 would remain intact, with all links accessing the new file contents. The new
1863 1867 \fBld\fR behavior \fBbreaks\fR such links, with the result that only the
1864 1868 specified output file name references the new file. All the other links
1865 1869 continue to reference the old file. To ensure consistent behavior, applications
1866 1870 that rely on multiple hard links to linker output files should explicitly
1867 1871 remove and relink the other file names.
|
↓ open down ↓ |
729 lines elided |
↑ open up ↑ |
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX