1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
|
#
# For a description of the syntax of this configuration file,
# see extra/config/Kconfig-language.txt
#
mainmenu "uClibc C Library Configuration"
choice
prompt "Target Architecture"
default TARGET_i386
help
Stuff
config TARGET_alpha
bool "alpha"
config TARGET_arm
bool "arm"
config TARGET_bfin
bool "bfin (BROKEN)"
config TARGET_cris
bool "cris (BROKEN)"
config TARGET_e1
bool "e1 (BROKEN)"
config TARGET_frv
bool "frv (BROKEN)"
config TARGET_h8300
bool "h8300 (BROKEN)"
config TARGET_hppa
bool "hppa"
config TARGET_i386
bool "i386"
config TARGET_i960
bool "i960 (BROKEN)"
config TARGET_m68k
bool "m68k"
config TARGET_microblaze
bool "microblaze (BROKEN)"
config TARGET_mips
bool "mips"
config TARGET_nios
bool "nios (BROKEN)"
config TARGET_nios2
bool "nios2 (BROKEN)"
config TARGET_powerpc
bool "powerpc"
config TARGET_sh
bool "superh"
config TARGET_sh64
bool "sh64"
config TARGET_sparc
bool "sparc"
config TARGET_v850
bool "v850 (BROKEN)"
config TARGET_x86_64
bool "x86_64"
endchoice
menu "Target Architecture Features and Options"
if TARGET_alpha
source "extra/Configs/Config.alpha"
endif
if TARGET_arm
source "extra/Configs/Config.arm"
endif
if TARGET_bfin
source "extra/Configs/Config.bfin"
endif
if TARGET_cris
source "extra/Configs/Config.cris"
endif
if TARGET_e1
source "extra/Configs/Config.e1"
endif
if TARGET_frv
source "extra/Configs/Config.frv"
endif
if TARGET_h8300
source "extra/Configs/Config.h8300"
endif
if TARGET_hppa
source "extra/Configs/Config.hppa"
endif
if TARGET_i386
source "extra/Configs/Config.i386"
endif
if TARGET_i960
source "extra/Configs/Config.i960"
endif
if TARGET_m68k
source "extra/Configs/Config.m68k"
endif
if TARGET_nios
source "extra/Configs/Config.nios"
endif
if TARGET_nios2
source "extra/Configs/Config.nios2"
endif
if TARGET_microblaze
source "extra/Configs/Config.microblaze"
endif
if TARGET_mips
source "extra/Configs/Config.mips"
endif
if TARGET_powerpc
source "extra/Configs/Config.powerpc"
endif
if TARGET_sh
source "extra/Configs/Config.sh"
endif
if TARGET_sh64
source "extra/Configs/Config.sh64"
endif
if TARGET_sparc
source "extra/Configs/Config.sparc"
endif
if TARGET_v850
source "extra/Configs/Config.v850"
endif
if TARGET_x86_64
source "extra/Configs/Config.x86_64"
endif
source "extra/Configs/Config.in.arch"
endmenu
menu "General Library Settings"
config HAVE_NO_PIC
bool
default n
config DOPIC
bool "Generate only Position Independent Code (PIC)"
default y
depends !HAVE_NO_PIC
help
If you wish to build all of uClibc as PIC objects, then answer Y here.
If you are unsure, then you should answer N.
config HAVE_NO_SHARED
bool
default n
config ARCH_HAS_NO_LDSO
bool
select HAVE_NO_SHARED
default n
config HAVE_SHARED
bool "Enable support for shared libraries"
depends on !HAVE_NO_SHARED
default y
help
If you wish to build uClibc with support for shared libraries then
answer Y here. If you only want to build uClibc as a static library,
then answer N.
config FORCE_SHAREABLE_TEXT_SEGMENTS
bool "Only load shared libraries which can share their text segment"
depends on HAVE_SHARED
select DOPIC
default n
help
If you answer Y here, the uClibc native shared library loader will
only load shared libraries, which do not need to modify any non-writable
segments. These libraries haven't set the DT_TEXTREL tag in the dynamic
section (==> objdump). All your libraries must be compiled with
-fPIC or -fpic, and all assembler function must be written as position
independent code (PIC).
Enabling this option will make uClibc's shared library loader a
little bit smaller and guarantee that no memory will be wasted by badly
coded shared libraries.
config LDSO_LDD_SUPPORT
bool "Native shared library loader 'ldd' support"
depends on HAVE_SHARED
default y
help
Enable this to enable all the code needed to support traditional ldd,
which executes the shared library loader to resolve all dependencies
and then provide a list of shared libraries that are required for an
application to function. Disabling this option will makes uClibc's
shared library loader a little bit smaller. Most people will answer Y.
config LDSO_CACHE_SUPPORT
bool "Enable shared library loader cache"
depends on HAVE_SHARED
default y
help
Enable this to make use of /etc/ld.so.conf, the shared library loader
cache configuration file to support for non-standard library paths.
After updating this file, it is necessary to run 'ldconfig' to update
the /etc/ld.so.cache shared library loader cache file.
config LDSO_PRELOAD_FILE_SUPPORT
bool "Enable shared library loader preload file support"
depends on HAVE_SHARED
default n
help
Enable this to make use of /etc/ld.so.preload. This file contains a
whitespace separated list of shared libraries to be loaded before
the program.
config LDSO_BASE_FILENAME
string "Shared library loader naming prefix"
depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
default "ld.so"
help
If you wish to support both uClibc and glibc on the same system, it
is necessary to set this to something other than "ld.so" to avoid
conflicts with glibc, which also uses "ld.so". This prevents both
libraries from using the same /etc/ld.so.* files. If you wish to
support both uClibc and glibc on the same system then you should set
this to "ld-uClibc.so".
Most people will leave this set to the default of "ld.so".
WARNING: Changing the default prefix could cause problems with
binutils' ld !
config LDSO_RUNPATH
bool "Enable ELF RUNPATH tag support"
depends on HAVE_SHARED
default y
help
ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
which extend the library search paths. They are really only useful
if a package installs libraries in non standard locations and
ld.so.conf support is disabled.
Usage of RUNPATH tags is not too common, so disabling this feature
should be safe for most people.
config UCLIBC_CTOR_DTOR
bool "Support global constructors and destructors"
default y
help
If you wish to build uClibc with support for global constructor
(ctor) and global destructor (dtor) support, then answer Y here.
When ctor/dtor support is enabled, binaries linked with uClibc must
also be linked with crtbegin.o and crtend.o which are provided by gcc
(the "*startfile:" and "*endfile:" settings in your gcc specs file
may need to be adjusted to include these files). This support will
also add a small amount of additional size to each binary compiled vs
uClibc. If you will be using uClibc with C++, or if you need the gcc
__attribute__((constructor)) and __attribute__((destructor)) to work,
then you definitely want to answer Y here. If you don't need ctors
or dtors and want your binaries to be as small as possible, then
answer N.
config HAS_NO_THREADS
bool
default n
config UCLIBC_HAS_THREADS
bool "POSIX Threading Support"
depends on !HAS_NO_THREADS
default y
help
If you want to compile uClibc with pthread support, then answer Y.
This will increase the size of uClibc by adding a bunch of locking
to critical data structures, and adding extra code to ensure that
functions are properly reentrant.
If your applications require pthreads, answer Y.
config PTHREADS_DEBUG_SUPPORT
bool "Build pthreads debugging support"
default n
depends on UCLIBC_HAS_THREADS
help
Say Y here if you wish to be able to debug applications that use
uClibc's pthreads library. By enabling this option, a library
named libthread_db will be built. This library will be dlopen()'d
by gdb and will allow gdb to debug the threads in your application.
IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
you must compile gdb with uClibc in order for pthread debugging to
work properly.
If you are doing development and want to debug applications using
uClibc's pthread library, answer Y. Otherwise, answer N.
config LINUXTHREADS_OLD
bool "Use the older (stable) version of linuxthreads"
default y
depends on UCLIBC_HAS_THREADS
help
There are two versions of linuxthreads. The older (stable) version
has been in uClibc for quite a long time but hasn't seen too many
updates other than bugfixes.
The new version has not been tested much, and lacks ports for arches
which glibc does not support (like bfin/frv/etc...), but is based on
the latest code from glibc, so it may be the only choice for the
newer ports (like alpha/amd64/64bit arches and hppa).
config UCLIBC_HAS_LFS
bool "Large File Support"
default y
help
If you wish to build uClibc with support for accessing large files
(i.e. files greater then 2 GiB) then answer Y. Do not enable this
if you are using an older Linux kernel (2.0.x) that lacks large file
support. Enabling this option will increase the size of uClibc.
config UCLIBC_STATIC_LDCONFIG
bool "Link ldconfig statically"
default y
help
Enable this option to statically link the ldconfig binary.
Making ldconfig static can be beneficial if you have a library
problem and need to use ldconfig to recover. Sometimes, it is
preferable to instead keep the size of the system down, in which
case you should disable this option.
choice
prompt "Malloc Implementation"
default MALLOC if ! ARCH_HAS_MMU
default MALLOC_STANDARD if ARCH_HAS_MMU
help
"malloc" use mmap for all allocations and so works very well on MMU-less
systems that do not support the brk() system call. It is pretty smart
about reusing already allocated memory, and minimizing memory wastage.
This is the default for uClinux MMU-less systems.
"malloc-simple" was written from scratch for uClibc, and is the
simplest possible (and therefore smallest) malloc implementation.
This uses only the mmap() system call to allocation memory, and does
not use the brk() system call at all, making it a fine choice for
MMU-less systems with very limited memory. It is rather dumb, and
certainly isn't the fastest. But it is 100% standards compliant,
thread safe, and very small.
"malloc-standard" is derived from the public domain dlmalloc
implementation by Doug Lea. It is quite fast, and is pretty smart
about reusing already allocated memory, and minimizing memory
wastage. This uses brk() for small allocations, while using mmap()
for larger allocations. This is the default malloc implementation
for uClibc.
If unsure, answer "malloc-standard".
config MALLOC
bool "malloc"
config MALLOC_SIMPLE
bool "malloc-simple"
config MALLOC_STANDARD
bool "malloc-standard"
depends on ARCH_HAS_MMU
endchoice
config MALLOC_GLIBC_COMPAT
bool "Malloc returns live pointer for malloc(0)"
default n
help
The behavior of malloc(0) is listed as implementation-defined by
SuSv3. Glibc returns a valid pointer to something, while uClibc
normally return a NULL. I personally feel glibc's behavior is
not particularly safe, and allows buggy applications to hide very
serious problems.
When this option is enabled, uClibc will act just like glibc, and
return a live pointer when someone calls malloc(0). This pointer
provides a malloc'ed area with a size of 1 byte. This feature is
mostly useful when dealing with applications using autoconf's broken
AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
does not detect glibc style returning-a-valid-pointer-for-malloc(0)
behavior). Most people can safely answer N.
config UCLIBC_DYNAMIC_ATEXIT
bool "Dynamic atexit() Support"
default y
help
When this option is enabled, uClibc will support an infinite number,
of atexit() and on_exit() functions, limited only by your available
memory. This can be important when uClibc is used with C++, since
global destructors are implemented via atexit(), and it is quite
possible to exceed the default number when this option is disabled.
Enabling this option adds a few bytes, and more significantly makes
atexit and on_exit depend on malloc, which can be bad when compiling
static executables.
Unless you use uClibc with C++, you should probably answer N.
config COMPAT_ATEXIT
bool "Old (visible) atexit Support"
default n
help
Enable this option if you want to update from 0.9.28 to svn/0.9.29, else
you will be missing atexit() until you rebuild all apps.
config HAS_SHADOW
bool "Shadow Password Support"
default y
help
Answer N if you do not need shadow password support.
Most people will answer Y.
config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
bool "Support for program_invocation_name"
default n
help
Support for the GNU-specific program_invocation_name and
program_invocation_short_name strings. Some GNU packages
(like tar and coreutils) utilize these for extra useful
output, but in general are not required.
At startup, these external strings are automatically set
up based on the value of ARGV[0].
If unsure, just answer N.
config UCLIBC_HAS___PROGNAME
bool "Support for __progname"
default y
help
Some packages (like openssh) like to peek into internal libc
symbols to make their output a bit more user friendly.
At startup, __progname is automatically set up based on the
value of ARGV[0].
If unsure, just answer N.
config UNIX98PTY_ONLY
bool "Support only Unix 98 PTYs"
default y
help
If you want to support only Unix 98 PTYs enable this. Some older
applications may need this disabled. For most current programs,
you can generally answer Y.
config ASSUME_DEVPTS
bool "Assume that /dev/pts is a devpts or devfs file system"
default y
help
Enable this if /dev/pts is on a devpts or devfs filesystem. Both
these filesystems automatically manage permissions on the /dev/pts
devices. You may need to mount your devpts or devfs filesystem on
/dev/pts for this to work.
Most people should answer Y.
config UCLIBC_HAS_TM_EXTENSIONS
bool "Support 'struct tm' timezone extension fields"
default y
help
Enabling this option adds fields to 'struct tm' in time.h for
tracking the number of seconds east of UTC, and an abbreviation for
the current timezone. These fields are not specified by the SuSv3
standard, but they are commonly used in both GNU and BSD application
code.
To strictly follow the SuSv3 standard, leave this disabled.
Most people will probably want to answer Y.
config UCLIBC_HAS_TZ_CACHING
bool "Enable caching of the last valid timezone 'TZ' string"
default y
help
Answer Y to enable caching of the last valid 'TZ' string describing
the timezone setting. This allows a quick string compare to avoid
repeated parsing of unchanged 'TZ' strings when tzset() is called.
Most people will answer Y.
config UCLIBC_HAS_TZ_FILE
bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
default y
help
Answer Y to enable the setting of a default timezone for uClibc.
Ordinarily, uClibc gets the timezone information exclusively from the
'TZ' environment variable. In particular, there is no support for
the zoneinfo directory tree or the /etc/timezone file used by glibc.
With this option enabled, uClibc will use the value stored in the
file '/etc/TZ' (default path) to obtain timezone information if the
'TZ' environment variable is missing or has an invalid value. The
file consists of a single line (newline required) of text describing
the timezone in the format specified for the TZ environment variable.
Simply doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
See
http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
for details on valid settings of 'TZ'.
Most people will answer Y.
config UCLIBC_HAS_TZ_FILE_READ_MANY
bool "Repeatedly read the '/etc/TZ' file"
depends on UCLIBC_HAS_TZ_FILE
default y
help
Answer Y to enable repeated reading of the '/etc/TZ' file even after
a valid value has been read. This incurs the overhead of an open/read/close
for each tzset() call (explicit or implied). However, setting this
will allows applications to update their timezone information if the contents
of the file change.
Most people will answer Y.
config UCLIBC_TZ_FILE_PATH
string "Path to the 'TZ' file for setting the global timezone"
depends on UCLIBC_HAS_TZ_FILE
default "/etc/TZ"
help
This is the path to the 'TZ' file.
Most people will use the default of '/etc/TZ'.
endmenu
menu "Networking Support"
config UCLIBC_HAS_IPV6
bool "IP version 6 Support"
default n
help
If you want to include support for the next version of the Internet
Protocol (IP version 6) then answer Y.
Most people should answer N.
config UCLIBC_HAS_RPC
bool "Remote Procedure Call (RPC) support"
default n
help
If you want to include RPC support, enable this. RPC is rarely used
for anything except for the NFS filesystem. Unless you plan to use NFS,
you can probably leave this set to N and save some space. If you need
to use NFS then you should answer Y.
config UCLIBC_HAS_FULL_RPC
bool "Full RPC support"
depends on UCLIBC_HAS_RPC
default y if !HAVE_SHARED
help
Normally we enable just enough RPC support for things like rshd and
nfs mounts to work. If you find you need the rest of the RPC stuff,
then enable this option. Most people can safely answer N.
config UCLIBC_HAS_REENTRANT_RPC
bool "Reentrant RPC support"
depends on UCLIBC_HAS_RPC
default y if !HAVE_SHARED
help
Most packages utilize the normal (non-reentrant) RPC functions, but
some (like exportfs from nfs-utils) need these reentrant versions.
Most people can safely answer N.
config UCLIBC_USE_NETLINK
bool "Use netlink to query interfaces"
default n
help
In newer versions of Linux (2.4.17+), support was added for querying
network device information via netlink rather than the old style
ioctl's. Most of the time, the older ioctl style is sufficient (and
it is smaller than netlink), but if you find that not all of your
devices are being returned by the if_nameindex() function, you will
have to use the netlink implementation.
Most people can safely answer N.
endmenu
menu "String and Stdio Support"
config UCLIBC_HAS_STRING_GENERIC_OPT
bool "Use glibc generic string functions"
default y
help
Answer Y to use the (tweaked) glibc generic string functions.
In general, they are faster (but 3-5K larger) than the base
uClibc string functions which are optimized solely for size.
Many people will answer Y.
config UCLIBC_HAS_STRING_ARCH_OPT
bool "Use arch-specific string functions"
default y
help
Answer Y to use the arch-specific string functions instead of the
base uClibc versions, which are optimized exclusively for size.
Most people will answer Y, as this has been default behavior
for some time.
config UCLIBC_HAS_CTYPE_TABLES
bool "Use Table Versions Of 'ctype.h' Functions."
default y
help
Answer Y to use table versions of the 'ctype.h' functions.
While the non-table versions are often smaller when building
staticly linked apps, they work only in stub locale mode.
Most people will answer Y.
config UCLIBC_HAS_CTYPE_SIGNED
bool "Support Signed Characters In 'ctype.h' Functions."
depends UCLIBC_HAS_CTYPE_TABLES
default y
help
Answer Y to enable support for passing signed char values to
the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
these functions are only defined for unsigned char values and
EOF. However, glibc allows negative signed char values as well
in order to support 'broken old programs'.
Most people will answer Y.
choice
prompt "ctype argument checking"
depends UCLIBC_HAS_CTYPE_TABLES
default UCLIBC_HAS_CTYPE_UNSAFE
help
Please select the invalid arg behavior you want for the 'ctype' functions.
The 'ctype' functions are now implemented using table lookups, with
the arg being the index. This can result in incorrect memory accesses
or even segfaults for args outside of the allowed range.
NOTE: This only affects the 'ctype' _functions_. It does not affect
the macro implementations.
config UCLIBC_HAS_CTYPE_UNSAFE
bool "Do not check -- unsafe"
config UCLIBC_HAS_CTYPE_CHECKED
bool "Detect and handle appropriately"
config UCLIBC_HAS_CTYPE_ENFORCED
bool "Issue a diagnostic and abort()"
endchoice
config UCLIBC_HAS_WCHAR
bool "Wide Character Support"
default n
help
Answer Y to enable wide character support. This will make uClibc
much larger. It is also currently required for locale support.
Most people will answer N.
config UCLIBC_HAS_LOCALE
bool "Locale Support"
select UCLIBC_HAS_WCHAR
select UCLIBC_HAS_CTYPE_TABLES
default n
help
uClibc now has full ANSI/ISO C99 locale support (except for
wcsftime() and collating items in regex). Be aware that enabling
this option will make uClibc much larger.
Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
(169 UTF-8 locales, and 144 locales for other codesets) will enlarge
uClibc by around 300k. You can reduce this size by building your own
custom set of locate data (see extra/locale/LOCALES for details).
uClibc's locale support is still under development. For example,
codesets using shift states are not currently supported. Support is
planned in the next iteration of locale support.
Answer Y to enable locale support. Most people will answer N.
config UCLIBC_PREGENERATED_LOCALE_DATA
bool "Use Pre-generated Locale Data"
depends on UCLIBC_HAS_LOCALE
default n
help
If you are selective and only want locale data for a few particular
locales, or you enjoy pain, or you are a rabid do-it-yourself sort of
person, you can turn this option off and manually walk through the
mostly undocumented procedure needed to generate your own locale
data.
Mere mortals will answer Y and use the default set of pregenerated
locale data, which supports 169 UTF-8 locales, and 144 locales for
other codesets (for the complete list see extra/locale/LOCALES).
config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
bool "Automagically Download the Pre-generated Locale Data (if necessary)"
depends on UCLIBC_PREGENERATED_LOCALE_DATA
default n
help
If you would like the build process to use 'wget' to automatically
download the pregenerated locale data, enable this option. Otherwise
you will need to obtain the locale data yourself from:
http://www.uclibc.org/downloads/uClibc-locale-030818.tgz
and place the uClibc-locale-030818.tgz tarball in the extra/locale/
directory.
Go ahead and make life easy for yourself... Answer Y.
config UCLIBC_HAS_XLOCALE
bool "Extended Locale Support (experimental/incomplete)"
depends on UCLIBC_HAS_LOCALE
default n
help
Answer Y to enable extended locale support similar to that provided
by glibc. This is primarily intended to support libstd++ functionality.
However, it also allows thread-specific locale selection via uselocale().
Most people will answer N.
config UCLIBC_HAS_HEXADECIMAL_FLOATS
bool "Support hexadecimal float notation"
depends UCLIBC_HAS_CTYPE_TABLES
depends on UCLIBC_HAS_FLOATS
default n
help
Answer Y to enable support for hexadecimal float notation in the
(wchar and) char string to floating point conversion functions, as
well as support for the %a and %A conversion specifiers in the
*printf() and *scanf() functions.
Most people will answer N.
config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
depends on UCLIBC_HAS_LOCALE
depends on UCLIBC_HAS_FLOATS
default n
help
Answer Y to enable support for glibc's \"'\" flag for allowing locale-specific
digit grouping in base 10 integer conversions and appropriate floating point
conversions in the *printf() and *scanf() functions.
Most people will answer N.
config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
bool "Do not require digit grouping when the \"'\" flag is specified"
depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
default y
help
Answer Y to make digit grouping optional when the \"'\" flag is specified.
This is the standard glibc behavior. If the initial string of digits
exceeds the maximum group number, the input will be treated as a normal
non-grouped number.
Most people will answer N.
config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
bool "Support glibc's register_printf_function() (glibc-compat)"
depends on !USE_OLD_VFPRINTF
default n
help
Answer Y to support glibc's register_printf_function() to allow an
application to add its own printf conversion specifiers.
NOTE: This implementation limits the number or registered specifiers to 10.
NOTE: This implementation requires new conversion specifiers to be ASCII
characters (0-0x7f). This is to avoid problems with processing
format strings in locales with different multibyte conversions.
Most people will answer N.
config USE_OLD_VFPRINTF
bool "Use the old vfprintf implementation"
depends on !UCLIBC_HAS_WCHAR
default n
help
Set to true to use the old vfprintf instead of the new. This is roughly
C89 compliant with some extensions, and is much smaller. However, it does
not support wide chars, positional args, or glibc custom printf specifiers.
Most people will answer N.
config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
int "Maximum number of positional args. Either 0 or >= 9."
depends on !USE_OLD_VFPRINTF
default 9
help
Set the maximum number of positional args supported by the printf/scanf
functions. The Single Unix Specification Version 3 requires a minimum
value of 9. Setting this to a value lower than 9 will disable positional
arg support and cause the NL_ARGMAX macro in limits.h to be #undef'd.
WARNING! The workspace to support positional args is currently allocated
on the stack. You probably don't want to set this to too high a value.
Most people will answer 9.
config UCLIBC_HAS_SCANF_GLIBC_A_FLAG
bool "Support glibc's 'a' flag for scanf string conversions (not implemented)"
default n
help
NOTE!!! Currently Not Implemented!!! Just A Place Holder!! NOTE!!!
NOTE!!! Conflicts with an ANSI/ISO C99 scanf flag!! NOTE!!!
Answer Y to enable support for glibc's 'a' flag for the scanf string
conversions '%s', '%[', '%ls', '%l[', and '%S'. This is used to
auto-allocate sufficient memory to hold the data retrieved.
Most people will answer N.
choice
prompt "Stdio buffer size"
default UCLIBC_HAS_STDIO_BUFSIZ_4096
help
Please select a value for BUFSIZ. This will be used by the
stdio subsystem as the default buffer size for a file, and
affects fopen(), setvbuf(), etc.
NOTE: Setting this to 'none' will disable buffering completely.
However, BUFSIZ will still be defined in stdio.h as 256 because
many applications use this value.
config UCLIBC_HAS_STDIO_BUFSIZ_NONE
bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
depends !UCLIBC_HAS_WCHAR
config UCLIBC_HAS_STDIO_BUFSIZ_256
bool "256 (minimum ANSI/ISO C99 value)"
config UCLIBC_HAS_STDIO_BUFSIZ_512
bool "512"
config UCLIBC_HAS_STDIO_BUFSIZ_1024
bool "1024"
config UCLIBC_HAS_STDIO_BUFSIZ_2048
bool "2048"
config UCLIBC_HAS_STDIO_BUFSIZ_4096
bool "4096"
config UCLIBC_HAS_STDIO_BUFSIZ_8192
bool "8192"
# If you add more choices, you will need to update uClibc_stdio.h.
endchoice
choice
prompt "Stdio builtin buffer size (uClibc-specific)"
depends !UCLIBC_HAS_STDIO_BUFSIZ_NONE
default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
help
When a FILE is created with fopen(), an attempt is made to allocate
a BUFSIZ buffer for it. If the allocation fails, fopen() will still
succeed but the FILE will be unbuffered.
This option adds a small amount of space to each FILE to act as an
emergency buffer in the event of a buffer allocation failure.
Most people will answer None.
config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
bool "None"
config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
bool "4"
config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
bool "8"
# If you add more choices, you will need to update uClibc_stdio.h.
endchoice
config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
bool "Attemt to shutdown stdio subsystem when abort() is called."
default n
help
ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was a behavioral
change made in SUSv3. Previously, abort() was required to have the affect of
fclose() on all open streams. The wording has been changed to "may" from "shall".
Most people will answer N.
config UCLIBC_HAS_STDIO_GETC_MACRO
bool "Provide a macro version of getc()"
depends !UCLIBC_HAS_STDIO_BUFSIZ_NONE
default y
help
Provide a macro version of getc().
Most people will answer Y.
config UCLIBC_HAS_STDIO_PUTC_MACRO
bool "Provide a macro version of putc()"
depends !UCLIBC_HAS_STDIO_BUFSIZ_NONE
default y
help
Provide a macro version of putc().
Most people will answer Y.
config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
bool "Support auto-r/w transition"
default y
help
Answer Y to enable the stdio subsystem to automaticly transition
between reading and writing. This relaxes the ANSI/ISO C99 requirement:
When a file is opened with update mode ('+' as the second or third character
in the list of mode argument values), both input and output may be performed
on the associated stream. However, output shall not be directly followed by
input without an intervening call to the fflush function or to a file
positioning function (fseek, fsetpos, or rewind), and input shall not be
directly followed by output without an intervening call to a file positioning
function, unless the input operation encounters end�of�file.
Most people will answer Y.
config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
depends on UCLIBC_HAS_LFS
default n
help
Answer Y to enable a uClibc-specific extension to allow passing an
additional 'F' flag in the mode string for fopen() to specify that
the file should be open()ed with the O_LARGEFILE flag set.
Most people will answer N.
config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
default n
help
Answer Y to support a glibc extension to allow passing
additional 'x' flag in the mode string for fopen() to specify that
the file should be open()ed with the O_EXCL flag set.
Most people will answer N.
config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
default n
help
Answer Y to support the glibc 'custom stream' extension functions
fmemopen(), open_memstream(), and fopencookie().
NOTE: There are some minor differences regarding seeking behavior.
Most people will answer N.
config UCLIBC_HAS_PRINTF_M_SPEC
bool "Support the '%m' specifier in printf format strings (glibc-compat)"
default n
help
Answer Y to support a glibc extension to interpret '%m' in printf
format strings as an instruction to output the error message string
(as generated by strerror) corresponding to the current value of 'errno'.
Most people will answer N.
config UCLIBC_HAS_ERRNO_MESSAGES
bool "Include the errno message text in the library"
default y
help
Answer Y if you want to include the errno message text in the
library. This adds about 3K to the library, but enables strerror()
to generate text other than 'Unknown error <number>'.
Most people will answer Y.
config UCLIBC_HAS_SYS_ERRLIST
bool "Support sys_errlist[] (obsolete-compat)"
depends on UCLIBC_HAS_ERRNO_MESSAGES
default n
help
Answer Y if you want to support the obsolete sys_errlist[].
This adds about 0.5k to the library, except for the mips
arch where it adds over 4K.
WARNING! In the future, support for sys_errlist[] may be unavailable
in at least some configurations. In fact, it may be removed altogether.
Most people will answer N.
config UCLIBC_HAS_SIGNUM_MESSAGES
bool "Include the signum message text in the library"
default y
help
Answer Y if you want to include the signum message text in the
library. This adds about 0.5K to the library, but enables strsignal()
to generate text other than 'Unknown signal <number>'.
Most people will answer Y.
config UCLIBC_HAS_SYS_SIGLIST
bool "Support sys_siglist[] (bsd-compat)"
depends on UCLIBC_HAS_SIGNUM_MESSAGES
default n
help
Answer Y if you want to support sys_siglist[].
WARNING! In the future, support for sys_siglist[] may be unavailable
in at least some configurations. In fact, it may be removed altogether.
Most people will answer N.
config UCLIBC_HAS_GETTEXT_AWARENESS
bool "Include gettext awareness"
depends on UCLIBC_HAS_LOCALE && UCLIBC_MJN3_ONLY
default n
help
NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
Answer Y if you want to include weak stub gettext support and
make the *strerror*() and strsignal() functions gettext-aware.
Currently, to get functional gettext functionality you will need
to use gnu gettext.
Most people will answer N.
config UCLIBC_HAS_GNU_GETOPT
bool "Support gnu getopt"
default y
help
Answer Y if you want to include full gnu getopt() instead of a
(much smaller) SUSv3 compatible getopt().
Most people will answer Y.
endmenu
menu "Big and Tall"
config UCLIBC_HAS_REGEX
bool "Regular Expression Support"
default y
help
POSIX regular expression code is really big -- 53k all by itself.
If you don't use regular expressions, turn this off and save space.
Of course, if you only staticly link, leave this on, since it will
only be included in your apps if you use regular expressions.
config UCLIBC_HAS_REGEX_OLD
bool "Use the older (stable) regular expression code"
depends on UCLIBC_HAS_REGEX
default y
help
There are two versions of regex. The older (stable) version has
been in uClibc for quite a long time but hasn't seen too many
updates. It also has some known issues when dealing with uncommon
corner cases and multibyte/unicode strings. However, it is quite
a bit smaller than the newer version.
If the older version has worked for you and you don't need unicode
support, then stick with the old version (and say Y here).
Otherwise, you should use the new version (and say N here).
config UCLIBC_HAS_FNMATCH
bool "fnmatch Support"
default y
help
POSIX fnmatch.
config UCLIBC_HAS_FNMATCH_OLD
bool "Use the older (stable) fnmatch code"
depends on UCLIBC_HAS_FNMATCH
default y
help
There are two versions of fnmatch. The older (stable) version has
been in uClibc for quite a long time but hasn't seen too many
updates. It also has some known issues when dealing with uncommon
corner cases and multibyte/unicode strings. However, it is quite
a bit smaller than the newer version.
If the older version has worked for you and you don't need unicode
support, then stick with the old version (and say Y here).
Otherwise, you should use the new version (and say N here).
config UCLIBC_HAS_WORDEXP
bool "Support the wordexp() interface"
depends on UCLIBC_HAS_GLOB
default n
help
The SuSv3 wordexp() interface performs word expansions per the Shell
and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
intended for use by applications that want to implement all of the
standard Bourne shell expansions on input data.
This interface is rarely used, and very large. Unless you have a
pressing need for wordexp(), you should probably answer N.
config UCLIBC_HAS_FTW
bool "Support the ftw() and nftw() interfaces"
default n
help
The SuSv3 ftw() and nftw() interfaces are used to recursively descend
directory paths while repeatedly calling a function.
This interface is rarely used, and adds around 4.5k. Unless you have
a pressing need for ftw() or nftw(), you should probably answer N.
config UCLIBC_HAS_GLOB
bool "Support the glob() interface"
default y
help
The glob interface is somewhat large (weighing in at about 4k). It
is used fairly often, but is an option since people wanting to go for
absolute minimum size may wish to omit it.
Most people will answer Y.
endmenu
menu "Library Installation Options"
config SHARED_LIB_LOADER_PREFIX
string "Shared library loader path"
depends on HAVE_SHARED
default "$(RUNTIME_PREFIX)lib"
help
When using shared libraries, this path is the location where the
shared library will be invoked. This value will be compiled into
every binary compiled with uClibc.
For a typical target system this should be set to "/lib", such that
'make install' will install /lib/ld-uClibc.so.0.
BIG FAT WARNING:
If you do not have a shared library loader with the correct name
sitting in the directory this points to, your binaries will not
run.
config RUNTIME_PREFIX
string "uClibc runtime library directory"
default "/usr/$(TARGET_ARCH)-linux-uclibc/"
help
RUNTIME_PREFIX is the directory into which the uClibc runtime
libraries will be installed. The result will look something
like the following:
$(RUNTIME_PREFIX)/
lib/ <contains all runtime libraries>
usr/bin/ldd <the ldd utility program>
sbin/ldconfig <the ldconfig utility program>
This value is used by the 'make install' Makefile target. Since this
directory is compiled into the shared library loader, you will need to
recompile uClibc if you change this value...
For a typical target system this should be set to "/", such that
'make install' will install /lib/libuClibc-<VERSION>.so
config DEVEL_PREFIX
string "uClibc development environment directory"
default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
help
DEVEL_PREFIX is the directory into which the uClibc development
environment will be installed. The result will look something
like the following:
$(DEVEL_PREFIX)/
lib/ <contains static libs>
include/ <Where all the header files go>
This value is used by the 'make install' Makefile target when
installing a uClibc development environment.
For a typical target system this should be set to "/usr", such that
'make install' will install /usr/include/<header files>.
endmenu
menu "Security options"
config UCLIBC_BUILD_PIE
bool "Build utilities as ET_DYN/PIE executables"
depends on HAVE_SHARED
depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
select FORCE_SHAREABLE_TEXT_SEGMENTS
default n
help
If you answer Y here, ldd and iconv are built as ET_DYN/PIE executables.
It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so all
libraries have to be built with -fPIC or -fpic, and all assembler
functions must be written as position independent code (PIC).
config UCLIBC_HAS_ARC4RANDOM
bool "Include the arc4random() function"
default n
help
Answer Y to support the OpenBSD-like arc4random() function. This
function picks a random number between 0 and N, and will always return
something even if the random driver is dead. If urandom fails then
gettimeofday(2) will be used as the random seed. This function is
designed to be more dependable than invoking /dev/urandom directly.
OpenSSL and OpenNTPD currently support this function.
Most people will answer N.
config HAVE_NO_SSP
bool
default n
config UCLIBC_HAS_SSP
bool "Support for propolice smashing stack protector"
depends on !HAVE_NO_SSP
default n
help
Add propolice smashing stack protector to the library.
This requires a patched version of GCC or GCC 4.1, supporting the
-fstack-protector[-all] options, with the __guard and
__stack_smash_handler, respectively __stack_chk_guard and
__stack_chk_fail functions removed from libgcc.
These functions are added to libc instead.
More information at:
<http://www.research.ibm.com/trl/projects/security/ssp/>
Most people will answer N.
config SSP_QUICK_CANARY
bool "Use simple guard values without accessing /dev/urandom"
depends on UCLIBC_HAS_SSP
default n
help
Use gettimeofday(2) to define the __guard without accessing
/dev/urandom.
WARNING: This makes smashing stack protector vulnerable to timing
attacks.
Most people will answer N.
choice
prompt "Propolice protection blocking signal"
depends on UCLIBC_HAS_SSP
default PROPOLICE_BLOCK_ABRT if ! DODEBUG
default PROPOLICE_BLOCK_SEGV if DODEBUG
help
"abort" use SIGABRT to block offending programs.
This is the default implementation.
"segfault" use SIGSEGV to block offending programs.
Use this for debugging.
If unsure, answer "abort".
config PROPOLICE_BLOCK_ABRT
bool "abort"
config PROPOLICE_BLOCK_SEGV
bool "segfault"
endchoice
config UCLIBC_BUILD_SSP
bool "Build uClibc with propolice protection"
depends on UCLIBC_HAS_SSP
default n
help
Build all libraries and executables with propolice protection enabled.
config UCLIBC_BUILD_RELRO
bool "Build uClibc with RELRO"
depends on HAVE_SHARED
default y
help
Build all libraries and executables with -z relro.
config UCLIBC_BUILD_NOW
bool "Build uClibc with NOW"
depends on HAVE_SHARED
default y
help
Build all libraries and executables with -z now.
config UCLIBC_BUILD_NOEXECSTACK
bool "Build uClibc with noexecstack marking"
default y
help
Mark all assembler files as noexecstack. This will result in marking
all libraries and executables built against uClibc not requiring
executable stack.
endmenu
menu "uClibc development/debugging options"
config CROSS_COMPILER_PREFIX
string "Cross-compiling toolchain prefix"
default ""
help
The prefix used to execute your cross-compiling toolchain. For
example, if you run 'arm-linux-uclibc-gcc' to compile something,
then enter 'arm-linux-uclibc-' here.
config DODEBUG
bool "Build uClibc with debugging symbols"
select PTHREADS_DEBUG_SUPPORT if UCLIBC_HAS_THREADS
default n
help
Say Y here if you wish to compile uClibc with debugging symbols.
This will allow you to use a debugger to examine uClibc internals
while applications are running. This increases the size of the
library considerably and should only be used when doing development.
If you are doing development and want to debug uClibc, answer Y.
Otherwise, answer N.
config DODEBUG_PT
bool "Build pthread with debugging output"
depends on UCLIBC_HAS_THREADS
default n
help
Enable debug output in libpthread. This is only useful when doing
development in libpthread itself.
Otherwise, answer N.
config DOASSERTS
bool "Build uClibc with run-time assertion testing"
default n
help
Say Y here to include runtime assertion tests.
This enables runtime assertion testing in some code, which can
increase the size of the library and incur runtime overhead.
If you say N, then this testing will be disabled.
config SUPPORT_LD_DEBUG
bool "Build the shared library loader with debugging support"
depends on HAVE_SHARED
default n
help
Answer Y here to enable all the extra code needed to debug the uClibc
native shared library loader. The level of debugging noise that is
generated depends on the LD_DEBUG environment variable... Just set
LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
debug your application. Diagnostic messages will then be printed to
the stderr.
For now these debugging tokens are available:
detail provide more information for some options
move display copy processing
symbols display symbol table processing
reloc display relocation processing; detail shows the relocation patch
nofixups never fixes up jump relocations
bindings displays the resolve processing (function calls); detail shows the relocation patch
all Enable everything!
The additional environment variable:
LD_DEBUG_OUTPUT=file
redirects the diagnostics to an output file created using
the specified name and the process id as a suffix.
An excellent start is simply:
$ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
or to log everything to a file named 'logfile', try this
$ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
If you are doing development and want to debug uClibc's shared library
loader, answer Y. Mere mortals answer N.
config SUPPORT_LD_DEBUG_EARLY
bool "Build the shared library loader with early debugging support"
depends on HAVE_SHARED
default n
help
Answer Y here to if you find the uClibc shared library loader is
crashing or otherwise not working very early on. This is typical
only when starting a new port when you haven't figured out how to
properly get the values for argc, argv, environ, etc. This method
allows a degree of visibility into the very early shared library
loader initialization process. If you are doing development and want
to debug the uClibc shared library loader early initialization,
answer Y. Mere mortals answer N.
config UCLIBC_MALLOC_DEBUGGING
bool "Build malloc with debugging support"
depends MALLOC
default n
help
Answer Y here to compile extra debugging support code into malloc.
Malloc debugging output may then be enabled at runtime using the
MALLOC_DEBUG environment variable.
The value of MALLOC_DEBUG should be an integer, which is interpreted as
a bitmask with the following bits:
1 - do extra consistency checking
2 - output messages for malloc/free calls and OS allocation calls
4 - output messages for the `MMB' layer
8 - output messages for internal malloc heap manipulation calls
Because this increases the size of malloc appreciably (due to strings
etc), you should say N unless you need to debug a malloc problem.
config WARNINGS
string "Compiler Warnings"
default "-Wall"
help
Set this to the set of gcc warnings you wish to see while compiling.
config DOMULTI
bool "Compile all sources at once into an object"
default n
help
Set this to compile all sources at once into an object (IMA).
config UCLIBC_MJN3_ONLY
bool "Manuel's hidden warnings"
default n
help
Answer Y here to see all Manuel's personal notes, warnings, and todos.
Most people will answer N.
endmenu
|