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[/] [or1k/] [trunk/] [linux/] [uClibc/] [ldso/] [README] - Blame information for rev 1765

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Line No. Rev Author Line
1 1325 phoenix
 
2
Apr 20, 2001 -- Manuel Novoa III
3
 
4
Inital port for uClibc from debian ld.so_1.9.11-9.tar.gz.
5
 
6
Removed a.out support.
7
 
8
****************** original ld.so.lsm file **************************
9
Begin3
10
Title:          Linux shared, dynamic linker and utilities.
11
Version:        1.9.11
12
Entered-date:   01MAY99
13
Description:    This package contains ld.so, ld-linux.so, ldconfig,
14
                ldd and libdl.
15
Keywords:       dynamic linker, shared library, ld.so, ld-linux.so,
16
                ldconfig, ldd, libdl
17
Author:         david@ods.com (David Engel)
18
Maintained-by:  david@ods.com (David Engel)
19
Primary-site:   tsx-11.mit.edu /pub/linux/packages/GCC
20
                ld.so-1.9.11.tar.gz
21
Alternate-site: sunsite.unc.edu /pub/Linux/GCC
22
                ld.so-1.9.11.tar.gz
23
Platform:       Linux 2.0.0 or later.
24
Copying-policy: Copyrighted but freely distributable.
25
End
26
*********************************************************************
27
                   Original README starts here
28
*********************************************************************
29
 
30
This package contains my ELF dynamic linkers (ld-linux.so.1), dynamic
31
linker library (libdl.so.1) and utilities (ldconfig and ldd) for Linux.
32
 
33
You need Linux kernel 2.0.0 or later with ELF support compiled in
34
(i.e. not loaded as a module) to use this package.
35
 
36
The dynamic linker is used to bootstrap programs and load shared
37
libraries at startup.  The dynamic linker library is used to
38
dynamically load shared libraries after a program is running.
39
Ldconfig is used to automatically update the symbolic links to shared
40
libraries and build the cache file used by the dynamic linker.  Ldd is
41
used to list the shared libraries used by a program.
42
 
43
Please see the included manual pages for further details.
44
 
45
To install, simply run "sh instldso.sh" as root.  Ready-to-go versions
46
of all end-products are provided so nothing should need to be compiled
47
or linked.  If you are still using libc5 as your primary development
48
library, you should use the "--devfiles" option when running
49
instldso.sh to install the file needed to compile with libdl.
50
 
51
ELF versions of gcc, binutils and libc are now required to compile
52
everything, including the old, unsupported, a.out dynamic linker.
53
Finally, an optimization level of O2 or higher must be used to compile
54
ld-linux.so and libdl.so due the use of inline functions.
55
 
56
Notable contributors to this package include Eric Youngdale, Peter
57
MacDonald, Hongjiu Lu, Linus Torvalds, Lars Wirzenius, Mitch D'Souza,
58
Rik Faith, Andreas Schwab and Adam Richter (not necessarily in that
59
order).
60
 
61
###################### IMPORTANT NOTICES #############################
62
 
63
A.OUT SUPPORT:
64
 
65
As of ld.so-1.9.0, the old, a.out dynamic loader is no longer
66
officially supported.  The code is still included and built, but I
67
make no promises that it will work.  I will accept patches for it,
68
but they will not be tested by me.
69
 
70
GLIBC (AKA LIBC6) SUPPORT:
71
 
72
As of ld.so-1.9.0, the main focus of this package is to ease the
73
transition to libc6.  No significant, new features are expected to be
74
added.  If you need new features, switch to libc6.
75
 
76
Except for libpthread.so, the sonames of the core libraries provided
77
with libc6 have been chosen so they do not conflict with those
78
provided by libc5 and ld.so.  However, the current plan is not use
79
new, nonconflicting sonames for other libraries such as ncurses and
80
X11.  This presents two problems.  First, libraries using the same
81
soname for both libc5 and libc6 can not be placed in the same
82
directory.  Second, the dynamic linkers need to make sure not to load
83
a library for the wrong version of libc.
84
 
85
The first problem is easy.  Just move the old, libc5-based libraries
86
to new directories (e.g. /lib/libc5-compat, /usr/lib/libc5-compat,
87
etc.) and add those directories to /etc/ld.so.conf.  Then install the
88
new, libc6-based versions in the standard places.
89
 
90
The second problem is more difficult.  Ideally, the dynamic linkers
91
would be changed to perform a complete dependency analysis on every
92
library to be loaded to make sure the wrong versions aren't used.
93
This approach doesn't seem worth the added complexity, especially
94
since we now have symbol versioning for ELF libraries.  Instead a
95
simpler approach will be used, at least initially.
96
 
97
Ldconfig has been modified to perform a (currently simple) dependency
98
analysis on libraries and to store an indication in /etc/ld.so.cache
99
of whether a library is for libc5, libc6 or an unknown libc.  The
100
dynamic linkers then only need to make a simple check at run-time to
101
make sure they don't load the wrong version of a library.
102
 
103
The dynamic linker for libc5 provided in this package, has already
104
been modified to use the new information in /etc/ld.so.cache.  For
105
glibc versions 2.0.1 and earlier, the dynamic linker for libc6 needs
106
the patch contained in glibc.patch.  You should apply the patch and
107
rebuild glibc before using the new ldconfig.
108
 
109
As stated above, the dependency analysis currently done by ldconfig is
110
rather simple.  Basically, it looks for the sonames used by the
111
various versions of libc, libm and libdl.  For any approach using a
112
dependency analysis such as this to work, it is very important that
113
shared libraries be built with complete dependency information.  This
114
can be done by using the appropriate -l options when running 'gcc
115
-shared'.  For example, when building libfoo.so which depends on libc
116
and libbar, you should add -lbar and -lc gcc command line.
117
 
118
######################################################################
119
 
120
Changes in version 1.9.11:
121
 
122
        Fixed a bug in ld-linux.so where a reference to an
123
        undefined symbol could cause a segfault.
124
 
125
        Added a clarification for LD_PRELOAD to the ld.so manual
126
        page and added a symlink for ld-linux.so (Bug#33123).
127
 
128
        Don't install ldd for Debian except for the m68k arch
129
        because glibc 2.1 now includes it (Bug#35458).
130
 
131
Changes in version 1.9.10:
132
 
133
        Changed ldconfig to issue a warning and not overwrite a
134
        regular file with a symlink (Bug#30859).
135
 
136
        Changed Debian packaging to conflict with and replace the
137
        ldconfig package (Bug#29398).
138
 
139
Changes in version 1.9.9:
140
 
141
        Changed ld-linux.so and libdl.so to match glibc by not
142
        allowing user preloads of system libraries into setu/gid
143
        binaries unless the library itself is setuid.
144
 
145
        Fixed problems in ld-linux.so on the sparc architecture
146
        (Juan Cespedes).
147
 
148
Changes in version 1.9.8:
149
 
150
        Changed ldconfig to allow the expected type for all
151
        libraries in a directory to be optionally specified
152
        (Mark Phillips).  See the ldconfig man page.
153
 
154
        Changed ldconfig to use the same type names used in the
155
        change above when the -p option is used.
156
 
157
Changes in version 1.9.7:
158
 
159
        Changed ldd for m68k to use /lib/ld.so.1 instead of
160
        /lib/ld-linux.so.2.
161
 
162
        Added support for dladdr to libdl.so (Eduard Gode).
163
 
164
        Fixed a small memory leak in libdl.so (Richard Garnish).
165
 
166
        Fixed a bug in ldconfig when the -l option was used on a
167
        filename without a '/' in it.
168
 
169
        Updated the man pages (Bug#6404, Bug#9721, Bug#10652,
170
        Bug#13494 and Bug#14127).  They could still use some work.
171
 
172
        No longer install the info page since it's way out of date.
173
 
174
        Fixed minor Debian packaging problems (Bug#13160,
175
        Bug#15577 and Bug#19345).
176
 
177
Changes in version 1.9.6:
178
 
179
        Changed ldd to not use the glibc dynamic linker when run
180
        on a libc5-based shared library.
181
 
182
        Added a -q option to ldconfig which causes warnings not
183
        to be printed (Bob Tinsley).
184
 
185
        Dropped support for the Debian libdl1-dev package.
186
 
187
        Changed ld-linux.so to be compilable with gcc 2.8.0 (Sven
188
        Verdoolaege)
189
 
190
Changes in version 1.9.5:
191
 
192
        Fixed a bug in ldd where ld-linux.so.2 was not called
193
        correctly when run on shared libraries.
194
 
195
        Fixed a problem in the previous version where some
196
        Makefiles were not architecture independent.
197
 
198
Changes in version 1.9.4:
199
 
200
        Fixed a bug in ld.so introduced in the previous version
201
        which broke preloads.
202
 
203
        Turned a.out support back on by default, at least for the
204
        time being.  There are no promises to keep it.
205
 
206
Changes in version 1.9.3:
207
 
208
        Fixed buffer overflow bugs in ld-linux.so and ld.so.
209
 
210
        Changed the README file a little to clarify a couple of
211
        things.
212
 
213
        Changed ldconfig to chroot to the specified directory when
214
        the new -r option is used (Bob Tinsley).
215
 
216
Changes in version 1.9.2:
217
 
218
        Removed /usr/local/lib from the default /etc/ld.so.conf
219
        for Debian (Bug#8181).
220
 
221
        Changed ldconfig to be 64-bit clean (H.J. Lu).
222
 
223
Changes in version 1.9.1:
224
 
225
        Changed ldconfig to try to determine which libc a
226
        library is for even if it doesn't have an soname.
227
 
228
        Fixed a bug in ldconfig where an older library using
229
        the glibc naming convention would be used instead of
230
        a newer library.
231
 
232
        Changed to ld-linux.so and libdl.so to not require the
233
        libc5 headers in order to compile.
234
 
235
        Changed ldconfig and ldd to be compilable with either
236
        libc5 or libc6.
237
 
238
Changes in version 1.9.0:
239
 
240
        Changed to not build the old, a.out dynamic loader by
241
        default.
242
 
243
        Changed instldso.sh to require the --force option to
244
        make sure users read the README file.
245
 
246
        Changed instldso.sh to not install the libdl.so
247
        development files unless the --devfiles option is used.
248
 
249
        Changed instldso.sh to not strip binaries and libraries
250
        if the --no-strip option is used.
251
 
252
        Changed the Debian packaging to put the development files
253
        which conflict with glibc in a new libdl1-dev package.
254
 
255
        Changed ldd to use the glibc dynamic linker, if it is
256
        available, when run on a shared library.
257
 
258
        Changed ld-linux.so to print the load addresses of
259
        libraries, ala glibc, when run by ldd.
260
 
261
        Changed ld-linux.so to allow the libraries listed in
262
        LD_PRELOAD to be separated by white space in addition to
263
        colons.
264
 
265
        Changed ld-linux.so to load the libraries listed in
266
        LD_PRELOAD for setu/gid programs as long as they can be
267
        loaded securely.
268
 
269
        Changed ldconfig to update the symlinks for the dynamic
270
        linkers.
271
 
272
        Changed ldconfig to try to determine if an ELF library is
273
        intended for libc5 or libc6 and save the infomation in the
274
        cache.  The mechanism used is rather simplistic and may
275
        need to be enhanced.
276
 
277
        Changed ldconfig to print the type of ELF library when
278
        printing the cache.
279
 
280
        Changed ld-linux.so to only load ELF shared libraries for
281
        use with libc5 or an unknown libc.
282
 
283
Changes in version 1.8.10:
284
 
285
        Fixed a bug in ldconfig where a symlink could be used
286
        instead of a regular file.
287
 
288
        Fixed a Debian packaging problem for the sparc
289
        architecture.
290
 
291
Changes in version 1.8.9:
292
 
293
        Changed ldconfig to only cache the symlinks it creates.
294
        This make the behavior of the dynamic linkers consistent
295
        with how they would behave if a cache was not used.
296
 
297
        Changed ldconfig to cache the symlinks that it finds but
298
        use the name of the symlink as the soname instead of the
299
        actual soname.
300
 
301
Changes in version 1.8.8:
302
 
303
        Minor documentation updates to reflect recent changes.
304
 
305
        Changed ld.so and ld-linux.so to perform more complete
306
        validation on ld.so.cache before using it.
307
 
308
        Changed ldconfig to accept libraries with inconsistent
309
        sonames since glibc is going to use them.  A warning is
310
        still printed in debug mode.
311
 
312
        Changed the install script to not strip _dl_debug_state
313
        from ld-linux.so since gdb needs it.
314
 
315
        More sparc fixes (Derrick Brashear).
316
 
317
        Changed ldconfig to not issue a warning when a linker
318
        script disguised as a shared library is found.
319
 
320
        Fixed a bug in ld-linux.so where some registers were
321
        not preserved on the first call to a function causing
322
        problems for non-C-like languages (Tim Renouf).
323
 
324
        Fixed a bug in ld-linux.so where global variables were
325
        not always mapped correctly across dynamically loaded
326
        libraries (Mikihiko Nakao).
327
 
328
        Converted to new Debian source packaging format (Shaya
329
        Potter).
330
 
331
Changes in version 1.8.6/7:
332
 
333
        Never released as some unofficial patches used these
334
        version numbers.
335
 
336
Changes in version 1.8.5:
337
 
338
        Fixed a bug in ld.so introduced in the previous changes.
339
 
340
Changes in version 1.8.4:
341
 
342
        Changed ldconfig to completely ignore symbolic links.
343
 
344
        Changed ldconfig to issue the warning concerning an
345
        inconsistent soname in non-verbose mode.
346
 
347
        Changed ld-linux.so back to not keep ld.so.cache mapped
348
        at all times.
349
 
350
        Changed Debian packaging to compress man pages, strip all
351
        binaries (Bug#5125) and include a shlibs file.
352
 
353
Changes in version 1.8.3:
354
 
355
        Changed ld-linux.so to process LD_PRELOAD before
356
        /etc/ld.so.preload.
357
 
358
        Fixed a Debian packaging problem where libdl might not
359
        be available if other packages were upgraded at the same
360
        time (Debian Bug#4728).
361
 
362
        Changed ldd to always exit with status 1 if any errors
363
        occur (Debian Bug#4188).
364
 
365
        Fixed some minor problems in instldso.sh (Mike Castle and
366
        Wolfgang Franke).
367
 
368
        Changed ldconfig to issue a warning in verbose mode when
369
        skipping a library because the soname doesn't match.
370
 
371
        More sparc fixes (Miguel de Icaza).
372
 
373
        Don't link with -N when building ld.so (Alan Modra).
374
 
375
        Changed ld-linux.so to better support position-dependant
376
        libraries (NIIBE Yutaka).
377
 
378
Changes in version 1.8.2:
379
 
380
        Added a texinfo file for ld.so and libdl (Michael
381
        Deutschmann).
382
 
383
        Minor sparc and installation changes (Elliot Lee).
384
 
385
        Added multiple architecture support for Debian (Leland
386
        Lucius).
387
 
388
        Changed libdl to better support RTLD_NEXT (Eric
389
        Youngdale).  Note: the exact meaning of ETLD_NEXT is
390
        still not clear in all cases.
391
 
392
        Removed some libc dependencies from libdl.  Still need
393
        to remove malloc and free.
394
 
395
Changes in version 1.8.1:
396
 
397
        Changed ld.so to be compiled as ELF.  This also means
398
        that ELF support is now required.  A.out support is
399
        still optional.
400
 
401
        Changed ld-linux.so and libdl.so to use the rpath in the
402
        executable instead of in the invoking shared library.
403
 
404
        More m68k fixes (Andreas Schwab).
405
 
406
        Various sparc fixes (Miguel de Icaza).
407
 
408
        Changed ldcnnfig to ignore libraries ending in '~'.
409
 
410
        Changed ldconfig to allow alternative conf and cache
411
        files to be specified on the command-line.
412
 
413
        Changed libdl.so to work when dlsym is passed a NULL
414
        handle pointer.
415
 
416
Changes in version 1.8.0:
417
 
418
        Changed ld-linux.so to be more liberal when checking to
419
        see if a library is already loaded.  This should avoid
420
        the duplicate loading problem for programs linkeed with
421
        the -rpath option.
422
 
423
        Various m68k fixes (Andreas Schwab).
424
 
425
        Changed ld.so to only use LD_AOUT_LIBRARY_PATH and
426
        LD_AOUT_PRELOAD and ld-linux.so to only use
427
        LD_LIBRARY_PATH and LD_PRELOAD.  LD_ELF_LIBRARY_PATH
428
        and LD_ELF_PRELOAD are no longer supported.
429
 
430
        Changed ld-linux.so to allow debugging of shared and
431
        dynamically loaded libraries (H.J. Lu, Andreas Schwab).
432
 
433
        Changed ld-linux.so to preload ELF shared libraries
434
        listed in /etc/ld.so.preload.  This allows secure
435
        preloads, even for setuid/setgid programs.
436
 
437
        Changed ld-linux.so to keep ld.so.cache mapped at all
438
        times.
439
 
440
        Changed ldconfig to allow #-style comments in ld.so.conf.
441
 
442
        Removed various compiler warnings (Richard Sladkey and
443
        David Engel).
444
 
445
        Changed ldd to work on ELF shared libraries.  This may
446
        need a little more work.
447
 
448
Changes in version 1.7.14:
449
 
450
        Changed ldconfig to recognize ELF shared libraries
451
        generated by post-2.6 versions of ld (Andreas Schwab).
452
 
453
        Changed ldconfig to not remove stale links that do not
454
        have a version number since they may be needed by ld.
455
 
456
Changes in version 1.7.13:
457
 
458
        Fixed a problem in ld-linux.so where a program linked
459
        with a shared library that was not used could result in
460
        a segmentation fault (H.J. Lu).
461
 
462
Changes in version 1.7.12:
463
 
464
        Fixed a problem in libdl.so where the wrong library
465
        could be marked as global when RTLD_GLOBAL was used
466
        (Lars Heete).
467
 
468
        Installed dlfcn.h with libdl.so instead of requiring
469
        it to be supplied with libc.
470
 
471
        Removed support for libldso.a since it was nearly
472
        impossible to use anyway.
473
 
474
        Changed ldd to detect when the program being checked
475
        exited abnormally.
476
 
477
Changes in version 1.7.11:
478
 
479
        Changed ld.so and ld-linux.so to delete all variations
480
        of LD_PRELOAD and LD_LIBRARY_PATH for set[ug]id programs,
481
        This makes it harder for broken set[ug]id programs to be
482
        compromised.
483
 
484
        Fixed a problem in libdl.so where dlsym would not accept
485
        the handle returned from dlopen(0, *).
486
 
487
Changes in version 1.7.10:
488
 
489
        Changed ld-linux.so and libdl.so to support RTLD_GLOBAL
490
        (Eric Youngdale).
491
 
492
Changes in version 1.7.9:
493
 
494
        Fixed a problem in ld-linux.so in detecting when the
495
        new user/group information is provided by the kernel.
496
 
497
        Fixed a problem in ld-linux.so where a buffer could be
498
        overflowed if a large number of libraries were loaded
499
        (Thomas Moore).
500
 
501
Changes in version 1.7.8:
502
 
503
        Changed the Makefiles and install scripts to support
504
        a.out- and ELF-only configurations.
505
 
506
        Changed ld-linux.so to use the user/group information
507
        provided by linux 1.3.23+ instead of making syscalls
508
        to get it.
509
 
510
        Changed libdl.so to support RTLD_NEXT (Glenn Fowler).
511
 
512
        Changed libdl.so to only execute the fini sections
513
        instead of completely closing libraries at exit (Glenn
514
        Fowler).
515
 
516
        Changed ld.so and ld-linux.so to print the required
517
        cache version when a mismatch is detected.
518
 
519
        Changed ld-linux.so to not require on /dev/zero (Ralph
520
        Loader).
521
 
522
        Minor m68k cleanups (Andreas Schwab).
523
 
524
Changes in version 1.7.7:
525
 
526
        Fixed problems compiling with recent 1.3.x kernels.
527
 
528
        Changed ld-linux.so to not use MAP_DENYWRITE until the
529
        permission issue regarding it is resolved.
530
 
531
Changes in version 1.7.6:
532
 
533
        Fixed a bug in ld-linux.so dealing with a zero-length
534
        LD_{ELF_}PRELOAD.
535
 
536
        Changed ld.so and ld-linux.so to truncate all variations
537
        of LD_PRELOAD and LD_LIBRARY_PATH for set[ug]id programs.
538
 
539
Changes in version 1.7.5:
540
 
541
        Changed ldconfig to recognize libraries without any
542
        version number (eg. libXYZ.so).
543
 
544
        Changed ldconfig to not generate a corrupt cache when
545
        the disk is full or other write errors occur.
546
 
547
        Changed ld-linux.so to map files with MAP_DENYWRITE to
548
        keep them from being changed while the file is in use
549
        (Rick Sladkey).
550
 
551
        Changed libdl to not overwrite the scope pointer of a
552
        library if it was already loaded (H.J. Lu).
553
 
554
        Changed ld-linux.so so gdb can be used on constructors
555
        (Eric Youngdale).
556
 
557
        Changed ldconfig to ignore ELF libraries where the soname
558
        does not match the file name on the assumption that it is
559
        a used at compile-time (eg. libcurses.so -> libncruses.so).
560
 
561
Changes in version 1.7.4:
562
 
563
        Changed ld-linux.so and libdl to use the appropriate
564
        rpaths when searching for shared libraries (Eric
565
        Youngdale).
566
 
567
        Changed ld-linux.so to search rpath before using the
568
        cache.  This more closely conforms to the IBCS standard.
569
 
570
Changes in version 1.7.3:
571
 
572
        Changed ld-linux.so to only print a library name the
573
        first time it is loaded when run from ldd.
574
 
575
        Fixed a bug in ldconfig where an invalid cache could be
576
        generated if a directory was specified multiple times in
577
        ld.so.conf.
578
 
579
        Changed ld-linux.so so it will return the address of a
580
        weak symbol when called from dlsym in libdl (Eric
581
        Youngdale.
582
 
583
Changes in version 1.7.2:
584
 
585
        Changed libdl.so again to fix the undefined foobar
586
        problem.
587
 
588
Changes in version 1.7.1:
589
 
590
        Changed libdl so it will compile at optimization level
591
        O3 or higher.
592
 
593
        Changed ldconfig to always create the cache file with
594
        mode 644.
595
 
596
        Changed ldconfig to not ingore valid symlinks.
597
 
598
        Changed ldconfig to use the library name as the soname
599
        for ELF libraries that do not have an soname entry.
600
 
601
        Changed ld-linux.so to print the actual, requested library
602
        name at the time it is loaded instead of trying to figure
603
        it out after the fact.
604
 
605
Changes in version 1.7.0:
606
 
607
        Changed ldconfig to read the actual soname from the image
608
        for ELF libraries and make it available to ld-linux.so.
609
        The soname for DLL libraries is still determined by
610
        truncating the minor numbers from the image file name.
611
 
612
        Changed ldconfig to no longer support the undocumented
613
        sort options.
614
 
615
        Changed ld.so to require a valid cache to find libraries
616
        in directories specified in ld.so.conf.  /usr/lib and /lib
617
        are still searched as a last resort.  Ld-linux.so already
618
        operated this way.
619
 
620
        Fixed a bug in libldso.a where the arguments to
621
        shared_loader were not parsed correctly (Wolfram Gloger).
622
 
623
        Added support for RELA-style relocations under Linux/68k
624
        (Andreas Schwab).
625
 
626
        Changed ld-linux.so to only map the cache once for all
627
        libraries instead of individually for each library.
628
 
629
        Changed ld-linux.so continue searching the cache instead of
630
        giving up when failing to load the first entry found.
631
 
632
        Changed ld-linux.so to produce output similar to ld.so when
633
        run from ldd or when errors occur.
634
 
635
Changes in version 1.6.7:
636
 
637
        Changed the install scripts to make sure that ld.so and
638
        ld-linux.so are always usable.
639
 
640
        Added support for Linux/Sparc (Eric Youngdale).
641
 
642
        Added support for Linux/68k (Andreas Schwab).
643
 
644
        Fixed various bugs in ld-linux.so dealing with closing
645
        files, unmapping memory, dereferencing NULL pointers and
646
        printing library names (David Engel, Eric Youngdale and
647
        Andreas Schwab).
648
 
649
        Replaced the manual page for libdl with a freely
650
        distributable one (Adam Richter).
651
 
652
        Fixed a bug in ld-linux.so where LD_LIBRARY_PATH and
653
        LD_PRELOAD were not cleared for setuid/setgid programs.
654
 
655
        Fixed a bug in libdl where dlsym would not return the
656
        correct address of a symbol if it was redefined in another
657
        library (Oleg Kibirev).
658
 
659
        Changed ld-linux.so to use the following order to search
660
        for libraries:  LD_{ELF_}LIBRARY_PATH, ld.so.cache, rpath,
661
        /usr/lib and /lib.
662
 
663
        Changed ld-linux.so to not needlessly allocate memory when
664
        using ld.so.cache.
665
 
666
Changes in version 1.6.6:
667
 
668
        Changed ldconfig to not warn about removing stale links
669
        unless the -v option is specified.
670
 
671
        Added manual pages for libdl (from FreeBSD/Sun)
672
 
673
        Fixed a bug in ld.so dealing with preloading of objects
674
        generated by recent versions of ld (Mitch D'Souza).
675
 
676
        Fixed bugs in ldd where some errors were either not
677
        detected or not printed.
678
 
679
        Fixed a bug in ld-linux.so where the trailing nul in a
680
        library name was not being copied (Owen Taylor).
681
 
682
Changes in version 1.6.5:
683
 
684
        Changed ldconfig to remove stale symbolic links.
685
 
686
        Added debug hooks in ld-linux.so and libdl.so to be used
687
        by a future version of gdb (Eric Youngdale).
688
 
689
Changes in version 1.6.4:
690
 
691
        Change ld-linux.so to print on stdout instead of stderr
692
        when run from ldd.
693
 
694
        Added support for Debian GNU/Linux packaging.
695
 
696
Changes in version 1.6.3:
697
 
698
        Fixed a bug in libdl when closing a library (H.J. Lu).
699
 
700
Changes in version 1.6.2:
701
 
702
        Changed the error message printed by ldd when a file is
703
        not a.out or ELF.  It used to only list a.out formats.
704
 
705
        Changed ldconfig to no longer cache and set up links for
706
        ld-linux.so.
707
 
708
        Changed ld-linux.so and libdl to not conflict with upcoming
709
        changes in kernel header files.
710
 
711
        Changed ld-linux.so to not print preloaded libraries.
712
 
713
Changes in version 1.6.1:
714
 
715
        Updated the installation script.
716
 
717
        Changed ld.so and ld-linux.so to look for LD_AOUT_PRELOAD
718
        and LD_ELF_PRELOAD, respectively, before LD_PRELOAD.
719
 
720
        Changed ld.so and ld-linux.so to use LD_AOUT_LIBRARY_PATH
721
        and LD_ELF_LIBRARY_PATH, respectively, instead of
722
        AOUT_LD_LIBRARY_PATH and ELF_LD_LIBRARY_PATH.
723
 
724
Changes in version 1.6.0:
725
 
726
        Changed ldconfig to process libraries which do not have
727
        a minor version or patch level number.
728
 
729
        Incorporated ld-linux.so and libdl.so.
730
 
731
        Changed ld.so and ld-linux.so to not miss entries in the
732
        cache when the fully qualified library is requested.
733
 
734
        Changed ldconfig to use stdout instead of stderr when
735
        printing the cache.
736
 
737
Changes in version 1.5.3:
738
 
739
        LD_PRELOAD enhancements (Tristan Gigold).
740
 
741
        LD_PRELOAD patch for linux-68k (Andreas Schwab).
742
 
743
Changes in version 1.5.2:
744
 
745
        More ELF changes (Mitch D'Souza).
746
 
747
        Changed ldconfig to also update the link for ld-linux.so.
748
 
749
Changes in version 1.5.1:
750
 
751
        More ELF and LD_PRELOAD changes (Mitch D'Souza).
752
 
753
Changes in version 1.5.0:
754
 
755
        Chnaged all executables to QMAGIC (Mitch D'Souza and Rick
756
        Sladkey).
757
 
758
        Added preliminary support for ELF to ldd and ldconfig (Eric
759
        Youndale and H.J. Lu).
760
 
761
        Added support for LD_PRELOAD to ld.so (Mitch D'Souza).
762
 
763
        Removed the "advertising" clause from the copyright notices
764
        in all source files.
765
 
766
Changes in version 1.4.4:
767
 
768
        Changed ldconfig to support QMAGIC libraries.
769
 
770
        Fixed a bug in ld.so where some of the error messages had
771
        transposed arguments.
772
 
773
Changes in version 1.4.3:
774
 
775
        Fixed an obscure bug in ld.so where an index was not being
776
        incremented when a library was not found using the cache.
777
 
778
Changes in version 1.4.2:
779
 
780
        Changed ldconfig to issue a warning and continue instead
781
        of an error and exiting when a link can't be updated.
782
        This is useful when some libraries are imported on read-
783
        only file systems, such as an NFS mounted /usr.
784
 
785
        Changed ld.so to be more robust in searching for libraries.
786
        A library is not considered found unless it can actually be
787
        loaded.  If a library is not found using the cache, the
788
        standard directories are searched as in pre-cache versions.
789
 
790
Changes in version 1.4.1:
791
 
792
        Fixed minor Makefile problems.
793
 
794
        Added support for linux-68k.
795
 
796
        Fixed a bug in ld.so where libraries with absolute paths
797
        were not handled correctly.
798
 
799
        Changed ld.so to ignore the directory in the names of
800
        shared libraries by default.  This allows older libraries
801
        with absolute paths, such as the XView libraries, to take
802
        advantage of the cache support.
803
 
804
        Added a minimal usage message to ldconfig.
805
 
806
Changes in version 1.4:
807
 
808
        Fixed bug in ld.so where minor version numbers were not
809
        reported correctly when a minor version incompatibility
810
        was found.
811
 
812
        Fixed bug in ldconfig where libraries with subversion
813
        numbers greater than 9 were not compared correctly.
814
 
815
        Added Mitch D'Souza's support for suppressing warning
816
        messages from ld.so about minor version incompatibilities.
817
 
818
        Added Mitch D'Souza's support for using a cache to speed
819
        up searching for libraries in the standard directories.
820
 
821
        Added Mitch D'Souza's support for a debugging version of
822
        ld.so.  Link with -lldso if you think you are experiencing
823
        dynamic linker problems.
824
 
825
Changes in version 1.3:
826
 
827
        Added support for libraries using absolute pathnames.  If I
828
        had known that the XView libraries used them, I would have
829
        added this earlier.
830
 
831
        Fixed a bug handling old libraries using a pathname beginning
832
        with '/' or '/lib/'.
833
 
834
Changes in version 1.2a:
835
 
836
        Fixed a minor bug in ldd which caused all files, specifically
837
        scripts, to be recognized as binaries.  Thanks to Olaf Flebbe
838
        for reporting it.
839
 
840
David Engel
841
david@sw.ods.com

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