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
|
#
# For a description of the syntax of this configuration file,
# see extra/config/Kconfig-language.txt
#
menu "General Library Settings"
config DOPIC
bool "Generate Position Independent Code (PIC)"
default y
depends !HAVE_NO_PIC
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 HAVE_SHARED
bool "Enable support for shared libraries"
depends on DOPIC
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 BUILD_UCLIBC_LDSO
bool "Compile native shared library loader"
depends on HAVE_SHARED
default y
help
uClibc has a native shared library loader for some architectures.
If you answer Y here, the uClibc native shared library loader will
be built for your target architecture. If this option is available,
to you, then you almost certainly want to answer Y.
config LDSO_LDD_SUPPORT
bool "Native shared library loader 'ldd' support"
depends on BUILD_UCLIBC_LDSO
default y
help
Enable this to enable all the code needed to support traditional ldd,
which executes the shared library loader to resolve all dependancies
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 UCLIBC_HAS_THREADS
bool "POSIX Threading Support"
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 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.
choice
prompt "Malloc Implementation"
default "malloc-930716"
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.
"malloc-930716" is derived from libc-5.3.12 and uses the brk() system call
for all memory allocations. This makes it very fast. It is also pretty
smart about reusing already allocated memory, and minimizing memory wastage.
Because this uses brk() it will not work on uClinux MMU-less systems.
If unsure, answer "malloc".
config MALLOC
bool "malloc"
config MALLOC_930716
bool "malloc-930716"
depends on UCLIBC_HAS_MMU
endchoice
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_REGEX
bool "Regular Expression Support"
default y
help
Posix regular expression code is really big -- 27k 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 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.
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 Procedute 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.
endmenu
menu "String and Stdio Support"
config UCLIBC_HAS_WCHAR
bool "Wide Charactor Support"
default n
help
Answer Y to enable wide char support. This will make uClibc much
bigger.
Most people will answer N.
config UCLIBC_HAS_LOCALE
bool "Locale Support (experimental/incomplete)"
depends on UCLIBC_HAS_WCHAR
default n
help
Answer Y to enable locale support. This will make uClibc much
bigger. uClibc's locale support is still under development, and
should be finished in the next several weeks (November 2002).
Most people will wisely answer N.
config USE_OLD_VFPRINTF
bool "Use the old vfprintf implementation"
default n
help
Set to true to use the old vfprintf instead of the new. This is roughly
C89 compliant, but doesn't deal with qualifiers on %n and doesn't deal with
%h correctly or %hh at all on the interger conversions. But on i386 it is
over 1.5k smaller than the new code. Of course, the new code fixes the
above mentioned deficiencies and adds custom specifier support similar to
glibc, as well as handling positional args. This will be rewritten at some
point to bring it to full C89 standards compliance.
Most people will answer N.
endmenu
menu "Library Installation Options"
config SHARED_LIB_LOADER_PATH
string "Shared library loader path"
depends on BUILD_UCLIBC_LDSO
default "$(DEVEL_PREFIX)/lib"
help
When using shared libraries, this path is the location where the
shared library will be invoked. This value will be compiled into
every binary compiled with uClibc.
BIG FAT WARNING:
If you do not have a shared library loader with the correct name
sitting in the directory this points to, your binaries will not
run.
config SYSTEM_LDSO
string "System shared library loader"
depends on HAVE_SHARED && !BUILD_UCLIBC_LDSO
default "/lib/ld-linux.so.2"
help
If you are using shared libraries, but do not want/have a native
uClibc shared library loader, please specify the name of your
target system's shared library loader here...
BIG FAT WARNING:
If you do not have a shared library loader with the correct name
sitting in the directory this points to, your binaries will not
run.
config DEVEL_PREFIX
string "uClibc development environment directory"
default "/usr/$(TARGET_ARCH)-linux-uclibc"
help
DEVEL_PREFIX is the directory into which the uClibc development
environment will be installed. The result will look something
like the following:
$(DEVEL_PREFIX)/
lib/ <contains all runtime and static libs>
include/ <Where all the header files go>
This value is used by the 'make install' Makefile target. Since this
directory is compiled into the uclibc cross compiler spoofer, you
have to recompile uClibc if you change this value...
config SYSTEM_DEVEL_PREFIX
string "uClibc development environment system directory"
default "$(DEVEL_PREFIX)"
help
SYSTEM_DEVEL_PREFIX is the directory prefix used when installing
bin/arch-uclibc-gcc, bin/arch-uclibc-ld, etc. This is only used by
the 'make install' target, and is not compiled into anything. This
defaults to $(DEVEL_PREFIX)/usr, but makers of .rpms and .debs will
want to set this to "/usr" instead.
config DEVEL_TOOL_PREFIX
string "uClibc development environment system directory"
default "$(DEVEL_PREFIX)/usr"
help
DEVEL_TOOL_PREFIX is the directory prefix used when installing
bin/gcc, bin/ld, etc. This is only used by the 'make install'
target, and is not compiled into anything. This defaults to
$(DEVEL_PREFIX)/usr, but makers of .rpms and .debs may want to
set this to something else.
endmenu
menu "uClibc hacking options"
config DODEBUG
bool "Build uClibc with debugging symbols"
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 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 BUILD_UCLIBC_LDSO
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 processings
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 BUILD_UCLIBC_LDSO
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 havn'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.
endmenu
|
