Config.in 73 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see extra/config/Kconfig-language.txt
  4. #
  5. mainmenu "uClibc C Library Configuration"
  6. config DESIRED_TARGET_ARCH
  7. string
  8. option env="ARCH"
  9. choice
  10. prompt "Target Architecture"
  11. default TARGET_alpha if DESIRED_TARGET_ARCH = "alpha"
  12. default TARGET_arm if DESIRED_TARGET_ARCH = "arm"
  13. default TARGET_avr32 if DESIRED_TARGET_ARCH = "avr32"
  14. default TARGET_bfin if DESIRED_TARGET_ARCH = "bfin"
  15. default TARGET_cris if DESIRED_TARGET_ARCH = "cris"
  16. default TARGET_e1 if DESIRED_TARGET_ARCH = "e1"
  17. default TARGET_frv if DESIRED_TARGET_ARCH = "frv"
  18. default TARGET_h8300 if DESIRED_TARGET_ARCH = "h8300"
  19. default TARGET_hppa if DESIRED_TARGET_ARCH = "hppa"
  20. default TARGET_i386 if DESIRED_TARGET_ARCH = "i386"
  21. default TARGET_i960 if DESIRED_TARGET_ARCH = "i960"
  22. default TARGET_ia64 if DESIRED_TARGET_ARCH = "ia64"
  23. default TARGET_m68k if DESIRED_TARGET_ARCH = "m68k"
  24. default TARGET_microblaze if DESIRED_TARGET_ARCH = "microblaze"
  25. default TARGET_mips if DESIRED_TARGET_ARCH = "mips"
  26. default TARGET_nios if DESIRED_TARGET_ARCH = "nios"
  27. default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
  28. default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
  29. default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
  30. default TARGET_sh64 if DESIRED_TARGET_ARCH = "sh64"
  31. default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
  32. default TARGET_v850 if DESIRED_TARGET_ARCH = "v850"
  33. default TARGET_vax if DESIRED_TARGET_ARCH = "vax"
  34. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  35. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  36. help
  37. The architecture of your target.
  38. config TARGET_alpha
  39. bool "alpha"
  40. config TARGET_arm
  41. bool "arm"
  42. config TARGET_avr32
  43. bool "avr32"
  44. config TARGET_bfin
  45. bool "bfin"
  46. config TARGET_cris
  47. bool "cris"
  48. config TARGET_e1
  49. bool "e1 (BROKEN)"
  50. config TARGET_frv
  51. bool "frv (BROKEN)"
  52. config TARGET_h8300
  53. bool "h8300 (BROKEN)"
  54. config TARGET_hppa
  55. bool "hppa"
  56. config TARGET_i386
  57. bool "i386"
  58. config TARGET_i960
  59. bool "i960 (BROKEN)"
  60. config TARGET_ia64
  61. bool "ia64"
  62. config TARGET_m68k
  63. bool "m68k"
  64. config TARGET_microblaze
  65. bool "microblaze"
  66. config TARGET_mips
  67. bool "mips"
  68. config TARGET_nios
  69. bool "nios"
  70. config TARGET_nios2
  71. bool "nios2"
  72. config TARGET_powerpc
  73. bool "powerpc"
  74. config TARGET_sh
  75. bool "superh"
  76. config TARGET_sh64
  77. bool "sh64"
  78. config TARGET_sparc
  79. bool "sparc"
  80. config TARGET_v850
  81. bool "v850 (BROKEN)"
  82. config TARGET_vax
  83. bool "vax"
  84. config TARGET_x86_64
  85. bool "x86_64"
  86. config TARGET_xtensa
  87. bool "xtensa"
  88. config TARGET_c6x
  89. bool "c6x"
  90. endchoice
  91. menu "Target Architecture Features and Options"
  92. if TARGET_alpha
  93. source "extra/Configs/Config.alpha"
  94. endif
  95. if TARGET_arm
  96. source "extra/Configs/Config.arm"
  97. endif
  98. if TARGET_avr32
  99. source "extra/Configs/Config.avr32"
  100. endif
  101. if TARGET_bfin
  102. source "extra/Configs/Config.bfin"
  103. endif
  104. if TARGET_cris
  105. source "extra/Configs/Config.cris"
  106. endif
  107. if TARGET_e1
  108. source "extra/Configs/Config.e1"
  109. endif
  110. if TARGET_frv
  111. source "extra/Configs/Config.frv"
  112. endif
  113. if TARGET_h8300
  114. source "extra/Configs/Config.h8300"
  115. endif
  116. if TARGET_hppa
  117. source "extra/Configs/Config.hppa"
  118. endif
  119. if TARGET_i386
  120. source "extra/Configs/Config.i386"
  121. endif
  122. if TARGET_i960
  123. source "extra/Configs/Config.i960"
  124. endif
  125. if TARGET_ia64
  126. source "extra/Configs/Config.ia64"
  127. endif
  128. if TARGET_m68k
  129. source "extra/Configs/Config.m68k"
  130. endif
  131. if TARGET_nios
  132. source "extra/Configs/Config.nios"
  133. endif
  134. if TARGET_nios2
  135. source "extra/Configs/Config.nios2"
  136. endif
  137. if TARGET_microblaze
  138. source "extra/Configs/Config.microblaze"
  139. endif
  140. if TARGET_mips
  141. source "extra/Configs/Config.mips"
  142. endif
  143. if TARGET_powerpc
  144. source "extra/Configs/Config.powerpc"
  145. endif
  146. if TARGET_sh
  147. source "extra/Configs/Config.sh"
  148. endif
  149. if TARGET_sh64
  150. source "extra/Configs/Config.sh64"
  151. endif
  152. if TARGET_sparc
  153. source "extra/Configs/Config.sparc"
  154. endif
  155. if TARGET_v850
  156. source "extra/Configs/Config.v850"
  157. endif
  158. if TARGET_vax
  159. source "extra/Configs/Config.vax"
  160. endif
  161. if TARGET_x86_64
  162. source "extra/Configs/Config.x86_64"
  163. endif
  164. if TARGET_xtensa
  165. source "extra/Configs/Config.xtensa"
  166. endif
  167. if TARGET_c6x
  168. source "extra/Configs/Config.c6x"
  169. endif
  170. config TARGET_SUBARCH
  171. string
  172. default "e500" if CONFIG_E500
  173. default "classic" if CONFIG_CLASSIC
  174. default "sh4" if CONFIG_SH4
  175. default "" if CONFIG_GENERIC_386 || CONFIG_386
  176. default "i486" if CONFIG_486
  177. default "i586" if CONFIG_586 || CONFIG_586MMX
  178. default "i686" if TARGET_ARCH = "i386"
  179. default ""
  180. source "extra/Configs/Config.in.arch"
  181. endmenu
  182. menu "General Library Settings"
  183. config HAVE_NO_PIC
  184. bool
  185. config DOPIC
  186. bool "Generate only Position Independent Code (PIC)"
  187. default y
  188. depends on !HAVE_NO_PIC
  189. help
  190. If you wish to build all of uClibc as PIC objects, then answer Y here.
  191. If you are unsure, then you should answer N.
  192. config ARCH_HAS_NO_SHARED
  193. bool
  194. config ARCH_HAS_NO_LDSO
  195. bool
  196. select ARCH_HAS_NO_SHARED
  197. config HAVE_SHARED
  198. bool "Enable shared libraries"
  199. depends on !ARCH_HAS_NO_SHARED
  200. default y
  201. help
  202. If you wish to build uClibc with support for shared libraries then
  203. answer Y here. If you only want to build uClibc as a static library,
  204. then answer N.
  205. config FORCE_SHAREABLE_TEXT_SEGMENTS
  206. bool "Only load shared libraries which can share their text segment"
  207. depends on HAVE_SHARED
  208. select DOPIC
  209. help
  210. If you answer Y here, the uClibc native shared library loader will
  211. only load shared libraries, which do not need to modify any
  212. non-writable segments. These libraries haven't set the DT_TEXTREL
  213. tag in the dynamic section (==> objdump).
  214. All your libraries must be compiled with -fPIC or -fpic, and all
  215. assembler function must be written as position independent code (PIC).
  216. Enabling this option will make uClibc's shared library loader a
  217. little bit smaller and guarantee that no memory will be wasted by
  218. badly coded shared libraries.
  219. config LDSO_LDD_SUPPORT
  220. bool "Native 'ldd' support"
  221. depends on HAVE_SHARED
  222. default y
  223. help
  224. Enable all the code needed to support traditional ldd,
  225. which executes the shared library loader to resolve all dependencies
  226. and then provide a list of shared libraries that are required for an
  227. application to function. Disabling this option will make uClibc's
  228. shared library loader a little bit smaller.
  229. Most people will answer Y.
  230. config LDSO_CACHE_SUPPORT
  231. bool "Enable library loader cache (ld.so.conf)"
  232. depends on HAVE_SHARED
  233. default y
  234. help
  235. Enable this to make use of /etc/ld.so.conf, the shared library loader
  236. cache configuration file to support for non-standard library paths.
  237. After updating this file, it is necessary to run 'ldconfig' to update
  238. the /etc/ld.so.cache shared library loader cache file.
  239. config LDSO_PRELOAD_ENV_SUPPORT
  240. bool "Enable library loader LD_PRELOAD environment"
  241. depends on HAVE_SHARED
  242. default y
  243. help
  244. Enable this to make use of LD_PRELOAD environment variable.
  245. A whitespace-separated list of additional, user-specified, ELF shared
  246. libraries to be loaded before all others. This can be used to
  247. selectively override functions in other shared libraries. For
  248. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  249. search directories that are also set-user-ID will be loaded.
  250. config LDSO_PRELOAD_FILE_SUPPORT
  251. bool "Enable library loader preload file (ld.so.preload)"
  252. depends on HAVE_SHARED
  253. help
  254. Enable this to make use of /etc/ld.so.preload. This file contains a
  255. whitespace separated list of shared libraries to be loaded before
  256. the program.
  257. config LDSO_BASE_FILENAME
  258. string "Shared library loader naming prefix"
  259. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  260. default "ld.so"
  261. help
  262. If you wish to support both uClibc and glibc on the same system, it
  263. is necessary to set this to something other than "ld.so" to avoid
  264. conflicts with glibc, which also uses "ld.so". This prevents both
  265. libraries from using the same /etc/ld.so.* files. If you wish to
  266. support both uClibc and glibc on the same system then you should set
  267. this to "ld-uClibc.so".
  268. Most people will leave this set to the default of "ld.so".
  269. WARNING: Changing the default prefix could cause problems with
  270. binutils' ld !
  271. config LDSO_STANDALONE_SUPPORT
  272. bool "Dynamic linker stand-alone mode support"
  273. depends on HAVE_SHARED
  274. help
  275. The dynamic linker can be run either indirectly through running some
  276. dynamically linked program or library (in which case no command line
  277. options to the dynamic linker can be passed and, in the ELF case, the
  278. dynamic linker which is stored in the .interp section of the program
  279. is executed) or directly by running:
  280. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  281. Stand-alone execution is a prerequisite for adding prelink
  282. capabilities to uClibc dynamic linker, as well useful for testing an
  283. updated version of the dynamic linker without breaking the system.
  284. config LDSO_PRELINK_SUPPORT
  285. bool "Dynamic linker prelink support"
  286. depends on HAVE_SHARED
  287. select LDSO_STANDALONE_SUPPORT
  288. help
  289. The dynamic linker can be used in stand-alone mode by the prelink tool
  290. for prelinking ELF shared libraries and binaries to speed up startup
  291. time. It also is able to load and handle prelinked libraries and
  292. binaries at runtime.
  293. config UCLIBC_STATIC_LDCONFIG
  294. bool "Link ldconfig statically"
  295. depends on HAVE_SHARED
  296. default y
  297. help
  298. Enable this option to statically link the ldconfig binary.
  299. Making ldconfig static can be beneficial if you have a library
  300. problem and need to use ldconfig to recover. Sometimes it is
  301. preferable to instead keep the size of the system down, in which
  302. case you should disable this option.
  303. config LDSO_RUNPATH
  304. bool "Enable ELF RUNPATH tag support"
  305. depends on HAVE_SHARED
  306. default y if LDSO_CACHE_SUPPORT
  307. help
  308. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  309. which extend the library search paths. They are really only useful
  310. if a package installs libraries in non standard locations and
  311. ld.so.conf support is disabled.
  312. Usage of RUNPATH tags is not too common, so disabling this feature
  313. should be safe for most people.
  314. config LDSO_SEARCH_INTERP_PATH
  315. bool "Add ldso path to lib search path"
  316. depends on HAVE_SHARED
  317. default y
  318. help
  319. The ldso is told where it is being executed from and can use that
  320. path to find related core libraries. This is useful by default,
  321. but can be annoying in a mixed development environment.
  322. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  323. library search with /foo/boo/
  324. If unsure, simply say Y here.
  325. config LDSO_NO_CLEANUP
  326. bool "Disable automatic unloading of dynamically loaded shared objects"
  327. depends on HAVE_SHARED
  328. default n
  329. help
  330. If you need complete allocation traces when debugging memory leaks
  331. using Valgrind in a process that dynamically loads shared objects,
  332. then answer Y here. Unlike glibc, uClibc unloads all dynamically
  333. loaded shared objects when a process exits, which prevents Valgrind
  334. from correctly resolving the symbols from the unloaded shared objects.
  335. Unless you know you need this, you should answer N.
  336. config UCLIBC_CTOR_DTOR
  337. bool "Support global constructors and destructors"
  338. default y
  339. help
  340. If you wish to build uClibc with support for global constructor
  341. (ctor) and global destructor (dtor) support, then answer Y here.
  342. When ctor/dtor support is enabled, binaries linked with uClibc must
  343. also be linked with crtbegin.o and crtend.o which are provided by gcc
  344. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  345. may need to be adjusted to include these files). This support will
  346. also add a small amount of additional size to each binary compiled vs
  347. uClibc. If you will be using uClibc with C++, or if you need the gcc
  348. __attribute__((constructor)) and __attribute__((destructor)) to work,
  349. then you definitely want to answer Y here. If you don't need ctors
  350. or dtors and want your binaries to be as small as possible, then
  351. answer N.
  352. config LDSO_GNU_HASH_SUPPORT
  353. bool "Enable GNU hash style support"
  354. depends on HAVE_SHARED
  355. help
  356. Newest binutils support a new hash style named GNU-hash. The dynamic
  357. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  358. if present into the ELF binaries, otherwise it will use the old SysV
  359. hash style (.hash). This ensures that it is completely backward
  360. compatible.
  361. Further, being the hash table implementation self-contained into each
  362. executable and shared libraries, objects with mixed hash style can
  363. peacefully coexist in the same process.
  364. If you want to use this new feature, answer Y
  365. choice
  366. prompt "Thread support"
  367. #default UCLIBC_HAS_THREADS_NATIVE if (TARGET_alpha || TARGET_arm || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_sh || TARGET_sh64)
  368. default HAS_NO_THREADS
  369. help
  370. If you want to compile uClibc with pthread support, then answer Y.
  371. This will increase the size of uClibc by adding a bunch of locking
  372. to critical data structures, and adding extra code to ensure that
  373. functions are properly reentrant.
  374. config HAS_NO_THREADS
  375. bool "none"
  376. help
  377. Disable thread support.
  378. config LINUXTHREADS_OLD
  379. bool "older (stable) version of linuxthreads"
  380. # linuxthreads and linuxthreads.old need nanosleep()
  381. select UCLIBC_HAS_REALTIME
  382. help
  383. There are two versions of linuxthreads. The older (stable) version
  384. has been in uClibc for quite a long time but hasn't seen too many
  385. updates other than bugfixes.
  386. config LINUXTHREADS_NEW
  387. bool "slightly newer version of linuxthreads"
  388. help
  389. The new version has not been tested much, and lacks ports for arches
  390. which glibc does not support (like bfin/frv/etc...), but is based on
  391. the latest code from glibc, so it may be the only choice for the
  392. newer ports (like alpha/amd64/64bit arches and hppa).
  393. config UCLIBC_HAS_THREADS_NATIVE
  394. bool "Native POSIX Threading (NPTL)"
  395. select UCLIBC_HAS_TLS
  396. select UCLIBC_HAS_STDIO_FUTEXES
  397. # NPTL local:
  398. select EXTRA_WARNINGS
  399. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  400. depends on !CONFIG_386
  401. help
  402. If you want to compile uClibc with NPTL support, then answer Y.
  403. IMPORTANT NOTE! NPTL requires a Linux 2.6 kernel, binutils
  404. at least version 2.16 and GCC with at least version 4.1.0. NPTL
  405. will not work with older versions of any above sources. If you
  406. ignore any of these guidelines, you do so at your own risk. Do
  407. not ask for help on any of the development mailing lists.
  408. !!!! WARNING !!!! BIG FAT WARNING !!!! REALLY BIG FAT WARNING !!!!
  409. This is experimental code and at times it may not even build and
  410. even if it does it might decide to do random damage. This code is
  411. potentially hazardous to your health and sanity. It will remain
  412. that way until further notice at which point this notice will
  413. disappear. Thank you for your support and for not smoking.
  414. endchoice
  415. config UCLIBC_HAS_THREADS
  416. def_bool y if !HAS_NO_THREADS
  417. config UCLIBC_HAS_TLS
  418. bool "Thread-Local Storage"
  419. depends on UCLIBC_HAS_THREADS_NATIVE
  420. help
  421. If you want to enable TLS support then answer Y.
  422. This is fast an efficient way to store per-thread local data
  423. which is not on stack. It needs __thread support enabled in
  424. gcc.
  425. config PTHREADS_DEBUG_SUPPORT
  426. bool "Build pthreads debugging support"
  427. depends on UCLIBC_HAS_THREADS
  428. help
  429. Say Y here if you wish to be able to debug applications that use
  430. uClibc's pthreads library. By enabling this option, a library
  431. named libthread_db will be built. This library will be dlopen()'d
  432. by gdb and will allow gdb to debug the threads in your application.
  433. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  434. you must compile gdb with uClibc in order for pthread debugging to
  435. work properly.
  436. If you are doing development and want to debug applications using
  437. uClibc's pthread library, answer Y. Otherwise, answer N.
  438. config UCLIBC_HAS_SYSLOG
  439. bool "Syslog support"
  440. default y
  441. depends on UCLIBC_HAS_NETWORK_SUPPORT
  442. select UCLIBC_HAS_SOCKET
  443. help
  444. Support sending messages to the system logger.
  445. This requires socket-support.
  446. config UCLIBC_HAS_LFS
  447. bool "Large File Support"
  448. default y
  449. help
  450. If you wish to build uClibc with support for accessing large files
  451. (i.e. files greater then 2 GiB) then answer Y. Do not enable this
  452. if you are using an older Linux kernel (2.0.x) that lacks large file
  453. support. Enabling this option will increase the size of uClibc.
  454. choice
  455. prompt "Malloc Implementation"
  456. default MALLOC if ! ARCH_USE_MMU
  457. default MALLOC_STANDARD if ARCH_USE_MMU
  458. config MALLOC
  459. bool "malloc"
  460. help
  461. "malloc" use mmap for all allocations and so works very well on
  462. MMU-less systems that do not support the brk() system call. It is
  463. pretty smart about reusing already allocated memory, and minimizing
  464. memory wastage.
  465. This is the default for uClinux MMU-less systems.
  466. config MALLOC_SIMPLE
  467. bool "malloc-simple"
  468. help
  469. "malloc-simple" is trivially simple and slow as molasses. It
  470. was written from scratch for uClibc, and is the simplest possible
  471. (and therefore smallest) malloc implementation.
  472. This uses only the mmap() system call to allocate and free memory,
  473. and does not use the brk() system call at all, making it a fine
  474. choice for MMU-less systems with very limited memory. It's 100%
  475. standards compliant, thread safe, very small, and releases freed
  476. memory back to the OS immediately rather than keeping it in the
  477. process's heap for reallocation. It is also VERY SLOW.
  478. config MALLOC_STANDARD
  479. bool "malloc-standard"
  480. depends on ARCH_USE_MMU
  481. help
  482. "malloc-standard" is derived from the public domain dlmalloc
  483. implementation by Doug Lea. It is quite fast, and is pretty smart
  484. about reusing already allocated memory, and minimizing memory
  485. wastage. This uses brk() for small allocations, while using mmap()
  486. for larger allocations. This is the default malloc implementation
  487. for uClibc.
  488. If unsure, answer "malloc-standard".
  489. endchoice
  490. config MALLOC_GLIBC_COMPAT
  491. bool "Malloc returns live pointer for malloc(0)"
  492. help
  493. The behavior of malloc(0) is listed as implementation-defined by
  494. SuSv3. Glibc returns a valid pointer to something, while uClibc
  495. normally returns NULL. I personally feel glibc's behavior is
  496. not particularly safe, and allows buggy applications to hide very
  497. serious problems.
  498. When this option is enabled, uClibc will act just like glibc, and
  499. return a live pointer when someone calls malloc(0). This pointer
  500. provides a malloc'ed area with a size of 1 byte. This feature is
  501. mostly useful when dealing with applications using autoconf's broken
  502. AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
  503. does not detect glibc style returning-a-valid-pointer-for-malloc(0)
  504. behavior). Most people can safely answer N.
  505. config UCLIBC_DYNAMIC_ATEXIT
  506. bool "Dynamic atexit() Support"
  507. default y
  508. help
  509. When this option is enabled, uClibc will support an infinite number,
  510. of atexit() and on_exit() functions, limited only by your available
  511. memory. This can be important when uClibc is used with C++, since
  512. global destructors are implemented via atexit(), and it is quite
  513. Enabling this option adds a few bytes, and more significantly makes
  514. atexit and on_exit depend on malloc, which can be bad when compiling
  515. static executables.
  516. Unless you use uClibc with C++, you should probably answer N.
  517. config COMPAT_ATEXIT
  518. bool "Old (visible) atexit Support"
  519. help
  520. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  521. else you will be missing atexit() until you rebuild all apps.
  522. config UCLIBC_SUSV3_LEGACY
  523. bool "Enable SuSv3 LEGACY functions"
  524. #vfork,
  525. # h_errno
  526. # gethostbyaddr
  527. # gethostbyname
  528. help
  529. Enable this option if you want to have SuSv3 LEGACY functions
  530. in the library, else they are replaced by SuSv3 proposed macros.
  531. Currently applies to:
  532. bcmp, bcopy, bzero, index, rindex, ftime,
  533. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  534. (getwd), (makecontext),
  535. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  536. scalb, (setcontext), (swapcontext), ualarm, usleep,
  537. wcswcs.
  538. WARNING! ABI incompatibility.
  539. config UCLIBC_SUSV3_LEGACY_MACROS
  540. bool "Enable SuSv3 LEGACY macros"
  541. help
  542. Enable this option if you want to have SuSv3 LEGACY macros.
  543. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  544. WARNING! ABI incompatibility.
  545. config UCLIBC_SUSV4_LEGACY
  546. bool "Enable SuSv4 LEGACY or obsolescent functions"
  547. help
  548. Enable this option if you want to have SuSv4 LEGACY functions
  549. and macros in the library.
  550. Currently applies to:
  551. - XSI functions:
  552. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  553. gettimeofday, isascii, pthread_getconcurrency,
  554. pthread_setconcurrency, setitimer, setpgrp, sighold,
  555. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  556. tempnam, toascii, ulimit.
  557. - Base functions:
  558. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  559. tmpnam, utime.
  560. WARNING! ABI incompatibility.
  561. config UCLIBC_STRICT_HEADERS
  562. bool "Enable structures and constants for unsupported features"
  563. help
  564. Enable structures and constants in headers that should not be used,
  565. because the respective feature is disabled.
  566. WARNING! enabling this option requires to patch many faulty apps,
  567. since they make (wrongly) use of these structures/constants,
  568. although the feature was disabled.
  569. config UCLIBC_HAS_STUBS
  570. bool "Provide stubs for unavailable functionality"
  571. help
  572. With this option uClibc provides non-functional stubs for
  573. functions which are impossible to implement on the target
  574. architecture. Otherwise, such functions are simply omitted.
  575. config UCLIBC_HAS_SHADOW
  576. bool "Shadow Password Support"
  577. default y
  578. help
  579. Answer N if you do not need shadow password support.
  580. Most people will answer Y.
  581. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  582. bool "Support for program_invocation_name"
  583. help
  584. Support for the GNU-specific program_invocation_name and
  585. program_invocation_short_name strings. Some GNU packages
  586. (like tar and coreutils) utilize these for extra useful
  587. output, but in general are not required.
  588. At startup, these external strings are automatically set
  589. up based on the value of ARGV[0].
  590. If unsure, just answer N.
  591. config UCLIBC_HAS___PROGNAME
  592. bool "Support for __progname"
  593. default y
  594. depends on UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  595. help
  596. Some packages (like openssh) like to peek into internal libc
  597. symbols to make their output a bit more user friendly.
  598. At startup, __progname is automatically set up based on the
  599. value of ARGV[0].
  600. If unsure, just answer N.
  601. config UCLIBC_HAS_PTY
  602. bool "Support for pseudo-terminals"
  603. default y
  604. help
  605. This enables support for pseudo-terminals (see man 4 pts
  606. and man 7 pty).
  607. If unsure, just answer Y.
  608. config ASSUME_DEVPTS
  609. bool "Assume that /dev/pts is a devpts or devfs file system"
  610. default y
  611. depends on UCLIBC_HAS_PTY
  612. help
  613. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  614. these filesystems automatically manage permissions on the /dev/pts
  615. devices. You may need to mount your devpts or devfs filesystem on
  616. /dev/pts for this to work.
  617. Most people should answer Y.
  618. config UNIX98PTY_ONLY
  619. bool "Support only Unix 98 PTYs"
  620. default y
  621. depends on UCLIBC_HAS_PTY
  622. help
  623. If you want to support only Unix 98 PTYs enable this. Some older
  624. applications may need this disabled and will thus use legacy BSD
  625. style PTY handling which is more complex and also bigger than
  626. Unix 98 PTY handling.
  627. For most current programs, you can generally answer Y.
  628. if UNIX98PTY_ONLY
  629. config UCLIBC_HAS_GETPT
  630. bool "Support getpt() (glibc-compat)"
  631. depends on UCLIBC_HAS_PTY
  632. help
  633. Some packages may need getpt().
  634. All of those are non-standard and can be considered
  635. GNU/libc compatibility.
  636. Either use posix_openpt() or just open /dev/ptmx yourself.
  637. If unsure, just say N.
  638. endif
  639. if !UNIX98PTY_ONLY
  640. # Have to use __libc_ptyname{1,2}[] and related bloat
  641. config UCLIBC_HAS_GETPT
  642. def_bool y
  643. endif
  644. config UCLIBC_HAS_LIBUTIL
  645. bool "Provide libutil library and functions"
  646. depends on UCLIBC_HAS_PTY
  647. help
  648. Provide a libutil library.
  649. This non-standard conforming library provides the following
  650. utility functions:
  651. forkpty(): combines openpty(), fork(2), and login_tty() to
  652. create a new process operating in a pseudo-terminal.
  653. login(): write utmp and wtmp entries
  654. login_tty(): prepares for a login on the tty fd by creating a
  655. new session, making fd the controlling terminal for
  656. the calling process, setting fd to be the standard
  657. input, output, and error streams of the current
  658. process, and closing fd.
  659. logout(): write utmp and wtmp entries
  660. logwtmp(): constructs a utmp structure and calls updwtmp() to
  661. append the structure to the utmp file.
  662. openpty(): finds an available pseudo-terminal and returns
  663. file descriptors for the master and slave
  664. This library adds about 3k-4k to your system.
  665. config UCLIBC_HAS_TM_EXTENSIONS
  666. bool "Support 'struct tm' timezone extension fields"
  667. default y
  668. help
  669. Enabling this option adds fields to 'struct tm' in time.h for
  670. tracking the number of seconds east of UTC, and an abbreviation for
  671. the current timezone. These fields are not specified by the SuSv3
  672. standard, but they are commonly used in both GNU and BSD application
  673. code.
  674. To strictly follow the SuSv3 standard, leave this disabled.
  675. Most people will probably want to answer Y.
  676. config UCLIBC_HAS_TZ_CACHING
  677. bool "Enable caching of the last valid timezone 'TZ' string"
  678. default y
  679. help
  680. Answer Y to enable caching of the last valid 'TZ' string describing
  681. the timezone setting. This allows a quick string compare to avoid
  682. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  683. Most people will answer Y.
  684. config UCLIBC_HAS_TZ_FILE
  685. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  686. default y
  687. help
  688. Answer Y to enable the setting of a default timezone for uClibc.
  689. Ordinarily, uClibc gets the timezone information exclusively from the
  690. 'TZ' environment variable. In particular, there is no support for
  691. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  692. With this option enabled, uClibc will use the value stored in the
  693. file '/etc/TZ' (default path) to obtain timezone information if the
  694. 'TZ' environment variable is missing or has an invalid value. The
  695. file consists of a single line (newline required) of text describing
  696. the timezone in the format specified for the TZ environment variable.
  697. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  698. See
  699. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  700. for details on valid settings of 'TZ'.
  701. Most people will answer Y.
  702. config UCLIBC_HAS_TZ_FILE_READ_MANY
  703. bool "Repeatedly read the '/etc/TZ' file"
  704. depends on UCLIBC_HAS_TZ_FILE
  705. default y
  706. help
  707. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  708. a valid value has been read. This incurs the overhead of an
  709. open/read/close for each tzset() call (explicit or implied). However,
  710. setting this will allow applications to update their timezone
  711. information if the contents of the file change.
  712. Most people will answer Y.
  713. config UCLIBC_TZ_FILE_PATH
  714. string "Path to the 'TZ' file for setting the global timezone"
  715. depends on UCLIBC_HAS_TZ_FILE
  716. default "/etc/TZ"
  717. help
  718. This is the path to the 'TZ' file.
  719. Most people will use the default of '/etc/TZ'.
  720. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  721. bool "Use /etc/localtime as a fallback"
  722. depends on UCLIBC_HAS_TZ_FILE
  723. default y
  724. help
  725. Answer Y to try to use /etc/localtime file.
  726. On glibc systems this file (if it is in TZif2 format)
  727. contains timezone string at the end.
  728. Most people will answer Y.
  729. endmenu
  730. menu "Advanced Library Settings"
  731. config UCLIBC_PWD_BUFFER_SIZE
  732. int "Buffer size for getpwnam() and friends"
  733. default 256
  734. range 12 1024
  735. help
  736. This sets the value of the buffer size for getpwnam() and friends.
  737. By default, this is 256. (For reference, glibc uses 1024).
  738. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  739. parameter.
  740. config UCLIBC_GRP_BUFFER_SIZE
  741. int "Buffer size for getgrnam() and friends"
  742. default 256
  743. range 12 1024
  744. help
  745. This sets the value of the buffer size for getgrnam() and friends.
  746. By default, this is 256. (For reference, glibc uses 1024).
  747. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  748. parameter.
  749. comment "Support various families of functions"
  750. config UCLIBC_LINUX_MODULE_24
  751. bool "Linux kernel module functions"
  752. default !(TARGET_bfin)
  753. help
  754. create_module, query_module
  755. are used in linux (prior to 2.6) for loadable kernel modules.
  756. Say N if you do not use kernel modules, or you only support
  757. Linux 2.6+.
  758. config UCLIBC_LINUX_SPECIFIC
  759. bool "Linux specific functions"
  760. default y
  761. help
  762. accept4(),
  763. capget(), capset(), fstatfs(), inotify_*(), ioperm(), iopl(),
  764. madvise(), modify_ldt(), pipe2(), personality(),
  765. prctl()/arch_prctl(),
  766. ppoll(), readahead(), reboot(), remap_file_pages(),
  767. sched_getaffinity(), sched_setaffinity(), sendfile(),
  768. setfsgid(), setfsuid(), setresuid(),
  769. splice(), vmsplice(), tee(), signalfd(), swapoff(), swapon(),
  770. sync_file_range(), sysctl(), sysinfo(), vhangup()
  771. config UCLIBC_HAS_GNU_ERROR
  772. bool "Support GNU extensions for error-reporting"
  773. default y
  774. help
  775. Support for the GNU-specific error(), error_at_line(),
  776. void (* error_print_progname)(), error_message_count
  777. functions and variables. Some GNU packages
  778. utilize these for extra useful output, but in general
  779. are not required.
  780. If unsure, just answer N.
  781. config UCLIBC_BSD_SPECIFIC
  782. bool "BSD specific functions"
  783. default y
  784. help
  785. mincore(), getdomainname(), setdomainname()
  786. If unsure, say N.
  787. config UCLIBC_HAS_BSD_ERR
  788. bool "BSD err functions"
  789. default y
  790. help
  791. These functions are non-standard BSD extensions.
  792. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  793. If unsure, say N.
  794. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  795. bool "BSD obsolete signal functions"
  796. help
  797. These functions are provided as a compatibility interface for
  798. programs that make use of the historical System V signal API.
  799. This API is obsolete:
  800. new applications should use the POSIX signal API (sigaction(2),
  801. sigprocmask(2), etc.).
  802. Affected functions:
  803. sigset(), sighold(), sigrelse(), sigignore()
  804. If unsure, say N.
  805. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  806. bool "SYSV obsolete signal functions"
  807. help
  808. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  809. If unsure, say N.
  810. config UCLIBC_NTP_LEGACY
  811. bool "ntp_*() aliases"
  812. help
  813. Provide legacy aliases for ntp functions:
  814. ntp_adjtime(), ntp_gettime()
  815. It is safe to say N here.
  816. config UCLIBC_SV4_DEPRECATED
  817. bool "Enable SVr4 deprecated functions"
  818. help
  819. These functions are DEPRECATED in System V release 4.
  820. Say N unless you desparately need one of the functions below:
  821. ustat() [use statfs(2) in your code instead]
  822. config UCLIBC_HAS_REALTIME
  823. bool "Realtime-related family of SUSv functions"
  824. default y
  825. help
  826. These functions are part of the Timers option and need not
  827. be available on all implementations.
  828. Includes AIO, message-queue, scheduler, semaphore functions:
  829. aio.h
  830. mqueue.h
  831. sched.h
  832. semaphore.h
  833. aio_cancel()
  834. aio_error()
  835. aio_fsync()
  836. aio_read()
  837. lio_listio()
  838. aio_return()
  839. aio_suspend()
  840. aio_write()
  841. clock_getres(), clock_gettime(), clock_settime()
  842. fdatasync()
  843. mlockall(), munlockall()
  844. mlock(), munlock()
  845. mq_close()
  846. mq_getattr()
  847. mq_notify()
  848. mq_open()
  849. mq_receive()
  850. mq_send()
  851. mq_setattr()
  852. mq_unlink()
  853. nanosleep()
  854. sched_getparam()
  855. sched_get_priority_max(), sched_get_priority_min()
  856. sched_getscheduler()
  857. sched_rr_get_interval()
  858. sched_setparam()
  859. sched_setscheduler()
  860. sem_close()
  861. sem_destroy()
  862. sem_getvalue()
  863. sem_init()
  864. sem_open()
  865. sem_post()
  866. sem_trywait(), sem_wait()
  867. sem_unlink()
  868. sigqueue()
  869. sigtimedwait(), sigwaitinfo()
  870. timer_create()
  871. timer_delete()
  872. timer_getoverrun(), timer_gettime(), timer_settime()
  873. config UCLIBC_HAS_ADVANCED_REALTIME
  874. bool "Advanced realtime-related family of SUSv functions"
  875. default y
  876. depends on UCLIBC_HAS_REALTIME
  877. help
  878. These functions are part of the Timers option and need not
  879. be available on all implementations.
  880. clock_getcpuclockid()
  881. clock_nanosleep()
  882. mq_timedreceive()
  883. mq_timedsend()
  884. posix_fadvise()
  885. posix_fallocate()
  886. posix_madvise()
  887. posix_memalign()
  888. posix_mem_offset()
  889. posix_spawnattr_destroy(), posix_spawnattr_init()
  890. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  891. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  892. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  893. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  894. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  895. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  896. posix_spawn_file_actions_addclose()
  897. posix_spawn_file_actions_adddup2()
  898. posix_spawn_file_actions_addopen()
  899. posix_spawn_file_actions_destroy()
  900. posix_spawn_file_actions_init()
  901. posix_spawn()
  902. posix_spawnp()
  903. posix_typed_mem_get_info()
  904. pthread_mutex_timedlock()
  905. sem_timedwait()
  906. #config UCLIBC_HAS_TERMIOS
  907. # bool "termios functions"
  908. # default y
  909. # help
  910. # Get and set terminal attributes, line control, get and set baud
  911. # rate.
  912. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  913. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  914. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  915. #
  916. # If unsure, say Y.
  917. config UCLIBC_HAS_EPOLL
  918. bool "epoll"
  919. default y
  920. help
  921. epoll_create(), epoll_ctl(), epoll_wait() functions.
  922. config UCLIBC_HAS_XATTR
  923. bool "Extended Attributes"
  924. default y
  925. help
  926. Extended Attributes support.
  927. setxattr()
  928. lsetxattr()
  929. fsetxattr()
  930. getxattr()
  931. lgetxattr()
  932. fgetxattr()
  933. listxattr()
  934. llistxattr()
  935. flistxattr()
  936. removexattr()
  937. lremovexattr()
  938. fremovexattr()
  939. Say N unless you need support for extended attributes and the
  940. filesystems do actually support them.
  941. config UCLIBC_HAS_PROFILING
  942. bool "Profiling support"
  943. default y
  944. help
  945. gcc's -finstrument-functions needs these.
  946. Most people can safely answer N.
  947. config UCLIBC_HAS_CRYPT_IMPL
  948. bool "libcrypt support"
  949. default y
  950. help
  951. libcrypt contains crypt(), setkey() and encrypt()
  952. config UCLIBC_HAS_CRYPT_STUB
  953. bool "libcrypt stubs"
  954. default y
  955. depends on !UCLIBC_HAS_CRYPT_IMPL
  956. help
  957. Standards mandate that crypt(3) provides a stub if it is unavailable.
  958. If you enable this option then stubs for
  959. crypt(), setkey() and encrypt()
  960. will be provided in a small libcrypt.
  961. config UCLIBC_HAS_CRYPT
  962. def_bool y
  963. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  964. endmenu
  965. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  966. bool "Networking Support"
  967. default y
  968. help
  969. Say N here if you do not need network support.
  970. if UCLIBC_HAS_NETWORK_SUPPORT
  971. config UCLIBC_HAS_SOCKET
  972. bool "Socket support"
  973. default y
  974. help
  975. If you want to include support for sockets then answer Y.
  976. config UCLIBC_HAS_IPV4
  977. bool "IP version 4 support"
  978. default y
  979. select UCLIBC_HAS_SOCKET
  980. help
  981. If you want to include support for the Internet Protocol
  982. (IP version 4) then answer Y.
  983. Most people will say Y.
  984. config UCLIBC_HAS_IPV6
  985. bool "IP version 6 support"
  986. select UCLIBC_HAS_SOCKET
  987. help
  988. If you want to include support for the next version of the Internet
  989. Protocol (IP version 6) then answer Y.
  990. Most people should answer N.
  991. config UCLIBC_HAS_RPC
  992. bool "Remote Procedure Call (RPC) support"
  993. # RPC+socket-ipvX doesn't currently work.
  994. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  995. help
  996. If you want to include RPC support, enable this. RPC is rarely used
  997. for anything except for the NFS filesystem. Unless you plan to use
  998. NFS, you can probably leave this set to N and save some space.
  999. If you need to use NFS then you should answer Y.
  1000. config UCLIBC_HAS_FULL_RPC
  1001. bool "Full RPC support"
  1002. depends on UCLIBC_HAS_RPC
  1003. default y if !HAVE_SHARED
  1004. help
  1005. Normally we enable just enough RPC support for things like rshd and
  1006. nfs mounts to work. If you find you need the rest of the RPC stuff,
  1007. then enable this option. Most people can safely answer N.
  1008. config UCLIBC_HAS_REENTRANT_RPC
  1009. bool "Reentrant RPC support"
  1010. depends on UCLIBC_HAS_RPC
  1011. default y if !HAVE_SHARED
  1012. help
  1013. Most packages utilize the normal (non-reentrant) RPC functions, but
  1014. some (like exportfs from nfs-utils) need these reentrant versions.
  1015. Most people can safely answer N.
  1016. config UCLIBC_USE_NETLINK
  1017. bool "Use netlink to query interfaces"
  1018. depends on UCLIBC_HAS_SOCKET
  1019. help
  1020. In newer versions of Linux (2.4.17+), support was added for querying
  1021. network device information via netlink rather than the old style
  1022. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1023. it is smaller than netlink), but if you find that not all of your
  1024. devices are being returned by the if_nameindex() function, you will
  1025. have to use the netlink implementation.
  1026. Most people can safely answer N.
  1027. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1028. bool "Support the AI_ADDRCONFIG flag"
  1029. depends on UCLIBC_USE_NETLINK
  1030. help
  1031. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1032. implementation using netlink to query interfaces to find both
  1033. ipv4 and ipv6 support. This is only needed if an application uses
  1034. the AI_ADDRCONFIG flag.
  1035. Most people can safely answer N.
  1036. config UCLIBC_HAS_BSD_RES_CLOSE
  1037. bool "Support res_close() (bsd-compat)"
  1038. help
  1039. Answer Y if you desperately want to support BSD compatibility in
  1040. the network code.
  1041. Most people will say N.
  1042. config UCLIBC_HAS_COMPAT_RES_STATE
  1043. bool "Use compatible but bloated _res"
  1044. default y
  1045. help
  1046. Answer Y if you build network utilities and they muck with resolver
  1047. internals a lot (_res global structure). uclibc does not use most
  1048. of _res.XXX fields, and with this option OFF they won't even exist.
  1049. Which will make e.g. dig build fail.
  1050. Answering N saves around 400 bytes in bss.
  1051. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1052. bool "Use extra compatible but extra bloated _res"
  1053. help
  1054. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1055. As far as I can say, this should never be needed.
  1056. config UCLIBC_HAS_RESOLVER_SUPPORT
  1057. bool "DNS resolver functions"
  1058. select UCLIBC_HAS_COMPAT_RES_STATE
  1059. help
  1060. Provide implementations for DNS resolver functions.
  1061. In particular, the following functions will be added to the
  1062. library:
  1063. ns_get16, ns_get32, ns_put16, ns_put32
  1064. config UCLIBC_HAS_LIBRESOLV_STUB
  1065. bool "Provide libresolv stub"
  1066. help
  1067. Provide a dummy resolv library.
  1068. config UCLIBC_HAS_LIBNSL_STUB
  1069. bool "Provide libnsl stub"
  1070. help
  1071. Provide a dummy nsl library.
  1072. endif
  1073. menu "String and Stdio Support"
  1074. config UCLIBC_HAS_STRING_GENERIC_OPT
  1075. bool "Use faster (but larger) generic string functions"
  1076. default y
  1077. help
  1078. Answer Y to use the (tweaked) glibc generic string functions.
  1079. In general, they are faster (but 3-5K larger) than the base
  1080. uClibc string functions which are optimized solely for size.
  1081. Many people will answer Y.
  1082. config UCLIBC_HAS_STRING_ARCH_OPT
  1083. bool "Use arch-specific assembly string functions (where available)"
  1084. default y
  1085. help
  1086. Answer Y to use any archtecture-specific assembly language string
  1087. functions available for this target plaform.
  1088. Note that assembly implementations are not available for all string
  1089. functions, so some generic (written in C) string functions may
  1090. still be used.
  1091. These are small and fast, the only reason _not_ to say Y here is
  1092. for debugging purposes.
  1093. config UCLIBC_HAS_CTYPE_TABLES
  1094. bool "Use Table Versions Of 'ctype.h' Functions."
  1095. default y
  1096. help
  1097. Answer Y to use table versions of the 'ctype.h' functions.
  1098. While the non-table versions are often smaller when building
  1099. statically linked apps, they work only in stub locale mode.
  1100. Most people will answer Y.
  1101. config UCLIBC_HAS_CTYPE_SIGNED
  1102. bool "Support Signed Characters In 'ctype.h' Functions."
  1103. depends on UCLIBC_HAS_CTYPE_TABLES
  1104. default y
  1105. help
  1106. Answer Y to enable support for passing signed char values to
  1107. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1108. these functions are only defined for unsigned char values and
  1109. EOF. However, glibc allows negative signed char values as well
  1110. in order to support 'broken old programs'.
  1111. Most people will answer Y.
  1112. choice
  1113. prompt "ctype argument checking"
  1114. depends on UCLIBC_HAS_CTYPE_TABLES
  1115. default UCLIBC_HAS_CTYPE_UNSAFE
  1116. help
  1117. Please select the invalid arg behavior you want for the 'ctype'
  1118. functions.
  1119. The 'ctype' functions are now implemented using table lookups, with
  1120. the arg being the index. This can result in incorrect memory accesses
  1121. or even segfaults for args outside of the allowed range.
  1122. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1123. the macro implementations.
  1124. config UCLIBC_HAS_CTYPE_UNSAFE
  1125. bool "Do not check -- unsafe"
  1126. config UCLIBC_HAS_CTYPE_CHECKED
  1127. bool "Detect and handle appropriately"
  1128. config UCLIBC_HAS_CTYPE_ENFORCED
  1129. bool "Issue a diagnostic and abort()"
  1130. endchoice
  1131. config UCLIBC_HAS_WCHAR
  1132. bool "Wide Character Support"
  1133. help
  1134. Answer Y to enable wide character support. This will make uClibc
  1135. much larger. It is also currently required for locale support.
  1136. Most people will answer N.
  1137. config UCLIBC_HAS_LOCALE
  1138. bool "Locale Support"
  1139. select UCLIBC_HAS_WCHAR
  1140. select UCLIBC_HAS_CTYPE_TABLES
  1141. help
  1142. uClibc now has full ANSI/ISO C99 locale support (except for
  1143. wcsftime() and collating items in regex). Be aware that enabling
  1144. this option will make uClibc much larger.
  1145. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1146. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1147. uClibc by around 300k. You can reduce this size by building your own
  1148. custom set of locate data (see extra/locale/LOCALES for details).
  1149. uClibc's locale support is still under development. For example,
  1150. codesets using shift states are not currently supported. Support is
  1151. planned in the next iteration of locale support.
  1152. Answer Y to enable locale support. Most people will answer N.
  1153. choice
  1154. prompt "Locale data"
  1155. depends on UCLIBC_HAS_LOCALE
  1156. default UCLIBC_BUILD_ALL_LOCALE
  1157. config UCLIBC_BUILD_ALL_LOCALE
  1158. bool "All locales"
  1159. depends on UCLIBC_HAS_LOCALE
  1160. help
  1161. This builds all the locales that are available on your
  1162. host-box.
  1163. config UCLIBC_BUILD_MINIMAL_LOCALE
  1164. bool "Only selected locales"
  1165. depends on UCLIBC_HAS_LOCALE
  1166. help
  1167. If you do not need all locales that are available on your
  1168. host-box, then set this to 'Y'.
  1169. config UCLIBC_PREGENERATED_LOCALE_DATA
  1170. bool "Use Pre-generated Locale Data"
  1171. depends on UCLIBC_HAS_LOCALE
  1172. help
  1173. Use pre-built locale data.
  1174. Note that these pregenerated locales are sensitive to your
  1175. target architecture (endianess, bitcount).
  1176. Saying N here is highly recommended.
  1177. endchoice
  1178. config UCLIBC_BUILD_MINIMAL_LOCALES
  1179. string "locales to use"
  1180. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1181. default "en_US"
  1182. help
  1183. Space separated list of locales to use.
  1184. E.g.:
  1185. en_US en_GB de_AT
  1186. default:
  1187. en_US
  1188. config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
  1189. bool "Automagically Download the Pre-generated Locale Data (if necessary)"
  1190. depends on UCLIBC_PREGENERATED_LOCALE_DATA
  1191. help
  1192. If you would like the build process to use 'wget' to automatically
  1193. download the pregenerated locale data, enable this option. Otherwise
  1194. you will need to obtain the locale data yourself from:
  1195. http://www.uclibc.org/downloads/uClibc-locale-*.tgz
  1196. and place the uClibc-locale-*.tgz tarball in the extra/locale/
  1197. directory.
  1198. Note that the use of pregenerated locale data is discouraged.
  1199. config UCLIBC_HAS_XLOCALE
  1200. bool "Extended Locale Support (experimental/incomplete)"
  1201. depends on UCLIBC_HAS_LOCALE
  1202. help
  1203. Answer Y to enable extended locale support similar to that provided
  1204. by glibc. This is primarily intended to support libstd++
  1205. functionality.
  1206. However, it also allows thread-specific locale selection via
  1207. uselocale().
  1208. Most people will answer N.
  1209. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1210. bool "Support hexadecimal float notation"
  1211. depends on UCLIBC_HAS_CTYPE_TABLES
  1212. depends on UCLIBC_HAS_FLOATS
  1213. help
  1214. Answer Y to enable support for hexadecimal float notation in the
  1215. (wchar and) char string to floating point conversion functions, as
  1216. well as support for the %a and %A conversion specifiers in the
  1217. *printf() and *scanf() functions.
  1218. Most people will answer N.
  1219. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1220. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1221. depends on UCLIBC_HAS_LOCALE
  1222. depends on UCLIBC_HAS_FLOATS
  1223. help
  1224. Answer Y to enable support for glibc's \"'\" flag for allowing
  1225. locale-specific digit grouping in base 10 integer conversions and
  1226. appropriate floating point conversions in the *printf() and *scanf()
  1227. functions.
  1228. Most people will answer N.
  1229. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1230. bool "Do not require digit grouping when the \"'\" flag is specified"
  1231. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1232. default y
  1233. help
  1234. Answer Y to make digit grouping optional when the \"'\" flag is
  1235. specified.
  1236. This is the standard glibc behavior. If the initial string of digits
  1237. exceeds the maximum group number, the input will be treated as a
  1238. normal non-grouped number.
  1239. Most people will answer N.
  1240. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1241. bool "Support glibc's register_printf_function() (glibc-compat)"
  1242. depends on !USE_OLD_VFPRINTF
  1243. help
  1244. Answer Y to support glibc's register_printf_function() to allow an
  1245. application to add its own printf conversion specifiers.
  1246. parse_printf_format() is also enabled.
  1247. NOTE: Limits the number or registered specifiers to 10.
  1248. NOTE: Requires new conversion specifiers to be ASCII
  1249. characters (0-0x7f). This is to avoid problems with processing
  1250. format strings in locales with different multibyte conversions.
  1251. Most people will answer N.
  1252. config USE_OLD_VFPRINTF
  1253. bool "Use the old vfprintf implementation"
  1254. depends on !UCLIBC_HAS_WCHAR
  1255. help
  1256. Set to true to use the old vfprintf instead of the new. This is
  1257. roughly C89 compliant with some extensions, and is much smaller.
  1258. However, it does not support wide chars, positional args, or glibc
  1259. custom printf specifiers.
  1260. Most people will answer N.
  1261. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1262. int "Maximum number of positional args. Either 0 or >= 9."
  1263. depends on !USE_OLD_VFPRINTF
  1264. default 9
  1265. help
  1266. Set the maximum number of positional args supported by the
  1267. printf/scanf functions. The Single Unix Specification Version 3
  1268. requires a minimum value of 9. Setting this to a value lower than
  1269. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1270. in limits.h to be #undef'd.
  1271. WARNING! The workspace to support positional args is currently
  1272. allocated on the stack. You probably don't want to set
  1273. this to too high a value.
  1274. Most people will answer 9.
  1275. config UCLIBC_HAS_SCANF_GLIBC_A_FLAG
  1276. bool "Support glibc's 'a' flag for scanf string conversions (not implemented)"
  1277. help
  1278. NOTE!!! Currently Not Implemented!!! Just A Place Holder!! NOTE!!!
  1279. NOTE!!! Conflicts with an ANSI/ISO C99 scanf flag!! NOTE!!!
  1280. Answer Y to enable support for glibc's 'a' flag for the scanf string
  1281. conversions '%s', '%[', '%ls', '%l[', and '%S'. This is used to
  1282. auto-allocate sufficient memory to hold the data retrieved.
  1283. Most people will answer N.
  1284. choice
  1285. prompt "Stdio buffer size"
  1286. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1287. help
  1288. Please select a value for BUFSIZ. This will be used by the
  1289. stdio subsystem as the default buffer size for a file, and
  1290. affects fopen(), setvbuf(), etc.
  1291. NOTE: Setting this to 'none' will disable buffering completely.
  1292. However, BUFSIZ will still be defined in stdio.h as 256 because
  1293. many applications use this value.
  1294. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1295. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1296. depends on !UCLIBC_HAS_WCHAR
  1297. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1298. bool "256 (minimum ANSI/ISO C99 value)"
  1299. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1300. bool "512"
  1301. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1302. bool "1024"
  1303. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1304. bool "2048"
  1305. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1306. bool "4096"
  1307. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1308. bool "8192"
  1309. # If you add more choices, you will need to update uClibc_stdio.h.
  1310. endchoice
  1311. choice
  1312. prompt "Stdio builtin buffer size (uClibc-specific)"
  1313. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1314. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1315. help
  1316. When a FILE is created with fopen(), an attempt is made to allocate
  1317. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1318. succeed but the FILE will be unbuffered.
  1319. This option adds a small amount of space to each FILE to act as an
  1320. emergency buffer in the event of a buffer allocation failure.
  1321. Most people will answer None.
  1322. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1323. bool "None"
  1324. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1325. bool "4"
  1326. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1327. bool "8"
  1328. # If you add more choices, you will need to update uClibc_stdio.h.
  1329. endchoice
  1330. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1331. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1332. help
  1333. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1334. a behavioral change made in SUSv3. Previously, abort() was required
  1335. to have the affect of fclose() on all open streams. The wording has
  1336. been changed to "may" from "shall".
  1337. Most people will answer N.
  1338. config UCLIBC_HAS_STDIO_GETC_MACRO
  1339. bool "Provide a macro version of getc()"
  1340. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1341. default y
  1342. help
  1343. Provide a macro version of getc().
  1344. Most people will answer Y.
  1345. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1346. bool "Provide a macro version of putc()"
  1347. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1348. default y
  1349. help
  1350. Provide a macro version of putc().
  1351. Most people will answer Y.
  1352. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1353. bool "Support auto-r/w transition"
  1354. default y
  1355. help
  1356. Answer Y to enable the stdio subsystem to automaticly transition
  1357. between reading and writing. This relaxes the ANSI/ISO C99
  1358. requirement:
  1359. When a file is opened with update mode ('+' as the second or third
  1360. character in the list of mode argument values), both input and output
  1361. may be performed on the associated stream. However, output shall not
  1362. be directly followed by input without an intervening call to the
  1363. fflush function or to a file positioning function (fseek, fsetpos,
  1364. or rewind), and input shall not be directly followed by output without
  1365. an intervening call to a file positioning function, unless the input
  1366. operation encounters end­of­file.
  1367. Most people will answer Y.
  1368. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1369. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1370. depends on UCLIBC_HAS_LFS
  1371. help
  1372. Answer Y to enable a uClibc-specific extension to allow passing an
  1373. additional 'F' flag in the mode string for fopen() to specify that
  1374. the file should be open()ed with the O_LARGEFILE flag set.
  1375. Most people will answer N.
  1376. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1377. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1378. help
  1379. Answer Y to support a glibc extension to allow passing
  1380. additional 'x' flag in the mode string for fopen() to specify that
  1381. the file should be open()ed with the O_EXCL flag set.
  1382. Most people will answer N.
  1383. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1384. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1385. help
  1386. Answer Y to support the glibc 'custom stream' extension functions
  1387. fmemopen(), open_memstream(), and fopencookie().
  1388. NOTE: There are some minor differences regarding seeking behavior.
  1389. Most people will answer N.
  1390. config UCLIBC_HAS_PRINTF_M_SPEC
  1391. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1392. help
  1393. Answer Y to support a glibc extension to interpret '%m' in printf
  1394. format strings as an instruction to output the error message string
  1395. (as generated by strerror) corresponding to the current value of
  1396. 'errno'.
  1397. Most people will answer N.
  1398. config UCLIBC_HAS_ERRNO_MESSAGES
  1399. bool "Include the errno message text in the library"
  1400. default y
  1401. help
  1402. Answer Y if you want to include the errno message text in the
  1403. library. This adds about 3K to the library, but enables strerror()
  1404. to generate text other than 'Unknown error <number>'.
  1405. Most people will answer Y.
  1406. config UCLIBC_HAS_SYS_ERRLIST
  1407. bool "Support sys_errlist[] (obsolete-compat)"
  1408. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1409. help
  1410. Answer Y if you want to support the obsolete sys_errlist[].
  1411. This adds about 0.5k to the library, except for the mips
  1412. arch where it adds over 4K.
  1413. WARNING! In the future, support for sys_errlist[] may be unavailable
  1414. in at least some configurations. In fact, it may be removed
  1415. altogether.
  1416. Most people will answer N.
  1417. Application writers: use the strerror(3) function.
  1418. config UCLIBC_HAS_SIGNUM_MESSAGES
  1419. bool "Include the signum message text in the library"
  1420. default y
  1421. help
  1422. Answer Y if you want to include the signum message text in the
  1423. library. This adds about 0.5K to the library, but enables strsignal()
  1424. to generate text other than 'Unknown signal <number>'.
  1425. Most people will answer Y.
  1426. config UCLIBC_HAS_SYS_SIGLIST
  1427. bool "Support sys_siglist[] (bsd-compat)"
  1428. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1429. help
  1430. Answer Y if you want to support sys_siglist[].
  1431. WARNING! In the future, support for sys_siglist[] may be unavailable
  1432. in at least some configurations. In fact, it may be removed
  1433. altogether.
  1434. Most people will answer N.
  1435. config UCLIBC_HAS_GETTEXT_AWARENESS
  1436. bool "Include gettext awareness"
  1437. depends on UCLIBC_HAS_LOCALE && UCLIBC_MJN3_ONLY
  1438. help
  1439. NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
  1440. Answer Y if you want to include weak stub gettext support and
  1441. make the *strerror*() and strsignal() functions gettext-aware.
  1442. Currently, to get functional gettext functionality you will need
  1443. to use gnu gettext.
  1444. Most people will answer N.
  1445. config UCLIBC_HAS_GNU_GETOPT
  1446. bool "Support gnu getopt"
  1447. default y
  1448. help
  1449. Answer Y if you want to include full gnu getopt() instead of a
  1450. (much smaller) SUSv3 compatible getopt().
  1451. Most people will answer Y.
  1452. config UCLIBC_HAS_STDIO_FUTEXES
  1453. bool "Use futexes for multithreaded I/O locking"
  1454. depends on UCLIBC_HAS_THREADS_NATIVE
  1455. help
  1456. If you want to compile uClibc to use futexes for low-level
  1457. I/O locking, answer Y. Otherwise, answer N.
  1458. config UCLIBC_HAS_GETOPT_LONG
  1459. bool "Support getopt_long/getopt_long_only"
  1460. depends on !UCLIBC_HAS_GNU_GETOPT
  1461. default y
  1462. help
  1463. Answer Y if you want to include getopt_long[_only() used by many
  1464. apps, even busybox.
  1465. Most people will answer Y.
  1466. config UCLIBC_HAS_GNU_GETSUBOPT
  1467. bool "Support glibc getsubopt"
  1468. default y
  1469. help
  1470. Answer Y if you want to include glibc getsubopt() instead of a
  1471. smaller SUSv3 compatible getsubopt().
  1472. Most people will answer Y.
  1473. endmenu
  1474. menu "Big and Tall"
  1475. config UCLIBC_HAS_REGEX
  1476. bool "Regular Expression Support"
  1477. default y
  1478. help
  1479. POSIX regular expression code is really big -- 53k all by itself.
  1480. If you don't use regular expressions, turn this off and save space.
  1481. Of course, if you only statically link, leave this on, since it will
  1482. only be included in your apps if you use regular expressions.
  1483. config UCLIBC_HAS_REGEX_OLD
  1484. bool "Use the older (stable) regular expression code"
  1485. depends on UCLIBC_HAS_REGEX
  1486. default y
  1487. help
  1488. There are two versions of regex. The older (stable) version has
  1489. been in uClibc for quite a long time but hasn't seen too many
  1490. updates. It also has some known issues when dealing with uncommon
  1491. corner cases and multibyte/unicode strings. However, it is quite
  1492. a bit smaller than the newer version.
  1493. If the older version has worked for you and you don't need unicode
  1494. support, then stick with the old version (and say Y here).
  1495. Otherwise, you should use the new version (and say N here).
  1496. config UCLIBC_HAS_FNMATCH
  1497. bool "fnmatch Support"
  1498. default y
  1499. help
  1500. POSIX fnmatch.
  1501. config UCLIBC_HAS_FNMATCH_OLD
  1502. bool "Use the older (stable) fnmatch code"
  1503. depends on UCLIBC_HAS_FNMATCH
  1504. default y
  1505. help
  1506. There are two versions of fnmatch. The older (stable) version has
  1507. been in uClibc for quite a long time but hasn't seen too many
  1508. updates. It also has some known issues when dealing with uncommon
  1509. corner cases and multibyte/unicode strings. However, it is quite
  1510. a bit smaller than the newer version.
  1511. If the older version has worked for you and you don't need unicode
  1512. support, then stick with the old version (and say Y here).
  1513. Otherwise, you should use the new version (and say N here).
  1514. config UCLIBC_HAS_WORDEXP
  1515. bool "Support the wordexp() interface"
  1516. depends on UCLIBC_HAS_GLOB
  1517. help
  1518. The SuSv3 wordexp() interface performs word expansions per the Shell
  1519. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1520. intended for use by applications that want to implement all of the
  1521. standard Bourne shell expansions on input data.
  1522. This interface is rarely used, and very large. Unless you have a
  1523. pressing need for wordexp(), you should probably answer N.
  1524. config UCLIBC_HAS_NFTW
  1525. bool "Support the nftw() interface"
  1526. help
  1527. The SuSv3 nftw() interface is used to recursively descend
  1528. directory paths while repeatedly calling a function.
  1529. This interface is rarely used, and adds around 4.5k. Unless you have
  1530. a pressing need for nftw(), you should probably answer N.
  1531. config UCLIBC_HAS_FTW
  1532. bool "Support the ftw() interface"
  1533. depends on UCLIBC_SUSV4_LEGACY
  1534. help
  1535. The SuSv3 ftw() interface is used to recursively descend
  1536. directory paths while repeatedly calling a function.
  1537. This interface is rarely used, and adds around 4.5k. Unless you have
  1538. a pressing need for ftw(), you should probably answer N.
  1539. config UCLIBC_HAS_FTS
  1540. bool "Support the fts() interface (bsd-compat)"
  1541. help
  1542. The fts functions are provided for traversing UNIX file hierarchies.
  1543. This interface is currently used by the elfutils and adds
  1544. around 7.5k.
  1545. You should port your application to use the POSIX nftw()
  1546. interface.
  1547. Unless you need to build/use elfutils, you should prolly answer N.
  1548. config UCLIBC_HAS_GLOB
  1549. bool "Support the glob() interface"
  1550. depends on UCLIBC_HAS_FNMATCH
  1551. default y
  1552. help
  1553. The glob interface is somewhat large (weighing in at about 2,5k). It
  1554. is used fairly often, but is an option since people wanting to go for
  1555. absolute minimum size may wish to omit it.
  1556. Most people will answer Y.
  1557. config UCLIBC_HAS_GNU_GLOB
  1558. bool "Support gnu glob() interface"
  1559. depends on UCLIBC_HAS_GLOB
  1560. help
  1561. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1562. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1563. from glibc and does not support all the GNU specific options.
  1564. Answer Y if you want to include full gnu glob() instead of the smaller
  1565. SUSv3 compatible glob().
  1566. Most people will answer N.
  1567. config UCLIBC_HAS_UTMPX
  1568. bool "utmpx based support for tracking login/logouts to/from the system"
  1569. help
  1570. Answer y to enable support for accessing user accounting database.
  1571. It can be used to track all login/logout to the system.
  1572. If unsure, just answer N.
  1573. endmenu
  1574. menu "Library Installation Options"
  1575. config RUNTIME_PREFIX
  1576. string "uClibc runtime library directory"
  1577. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1578. help
  1579. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1580. libraries will be installed. The result will look something
  1581. like the following:
  1582. $(RUNTIME_PREFIX)/
  1583. lib/ <contains all runtime libraries>
  1584. usr/bin/ldd <the ldd utility program>
  1585. sbin/ldconfig <the ldconfig utility program>
  1586. This value is used by the 'make install' Makefile target. Since this
  1587. directory is compiled into the shared library loader, you will need to
  1588. recompile uClibc if you change this value...
  1589. For a typical target system this should be set to "/", such that
  1590. 'make install' will install /lib/libuClibc-<VERSION>.so
  1591. config DEVEL_PREFIX
  1592. string "uClibc development environment directory"
  1593. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1594. help
  1595. DEVEL_PREFIX is the directory into which the uClibc development
  1596. environment will be installed. The result will look something
  1597. like the following:
  1598. $(DEVEL_PREFIX)/
  1599. lib/ <contains static libs>
  1600. include/ <Where all the header files go>
  1601. This value is used by the 'make install' Makefile target when
  1602. installing a uClibc development environment.
  1603. For a typical target system this should be set to "/usr", such that
  1604. 'make install' will install /usr/include/<header files>.
  1605. config MULTILIB_DIR
  1606. string "library path component"
  1607. default "lib"
  1608. help
  1609. Path component where libraries reside.
  1610. For a typical target system this should be set to "lib", such that
  1611. 'make install' will install libraries to "/lib" and "/usr/lib"
  1612. respectively
  1613. DEVEL_PREFIX/MULTILIB_DIR
  1614. RUNTIME_PREFIX/MULTILIB_DIR
  1615. Other settings may include "lib32" or "lib64".
  1616. config HARDWIRED_ABSPATH
  1617. bool "Hardwire absolute paths into linker scripts"
  1618. default y
  1619. help
  1620. This prepends absolute paths to the libraries mentioned in linker
  1621. scripts such as libc.so.
  1622. This is a build time optimization. It has no impact on dynamic
  1623. linking at runtime, which doesn't use linker scripts.
  1624. You must disable this to use uClibc with old non-sysroot toolchains,
  1625. such as the prebuilt binary cross compilers at:
  1626. http://uclibc.org/downloads/binaries
  1627. The amount of time saved by this optimization is actually too small to
  1628. measure. The linker just had to search the library path to find the
  1629. linker script, so the dentries are cache hot if it has to search the
  1630. same path again. But it's what glibc does, so we do it too.
  1631. endmenu
  1632. menu "Security options"
  1633. config UCLIBC_BUILD_PIE
  1634. bool "Build utilities as ET_DYN/PIE executables"
  1635. depends on HAVE_SHARED
  1636. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
  1637. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1638. help
  1639. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1640. executables.
  1641. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1642. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1643. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1644. all libraries have to be built with -fPIC or -fpic, and all
  1645. assembler functions must be written as position independent
  1646. code (PIC).
  1647. config UCLIBC_HAS_ARC4RANDOM
  1648. bool "Include the arc4random() function"
  1649. help
  1650. Answer Y to support the OpenBSD-like arc4random() function. This
  1651. function picks a random number between 0 and N, and will always return
  1652. something even if the random driver is dead. If urandom fails then
  1653. gettimeofday(2) will be used as the random seed. This function is
  1654. designed to be more dependable than invoking /dev/urandom directly.
  1655. OpenSSL and OpenNTPD currently support this function.
  1656. Most people will answer N.
  1657. config HAVE_NO_SSP
  1658. bool
  1659. config UCLIBC_HAS_SSP
  1660. bool "Support for GCC stack smashing protector"
  1661. depends on !HAVE_NO_SSP
  1662. help
  1663. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1664. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1665. the needed functions are added to ldso/libc instead.
  1666. GCC's stack protector is a reimplementation of IBM's propolice.
  1667. See http://www.trl.ibm.com/projects/security/ssp/ and
  1668. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1669. for details.
  1670. Note that NOEXECSTACK on a kernel with address space randomization
  1671. is generally sufficient to prevent most buffer overflow exploits
  1672. without increasing code size. This option essentially adds debugging
  1673. code to catch them.
  1674. Most people will answer N.
  1675. config UCLIBC_HAS_SSP_COMPAT
  1676. bool "Support for gcc-3.x propolice smashing stack protector"
  1677. depends on UCLIBC_HAS_SSP
  1678. help
  1679. Add gcc-3.x propolice smashing stack protector to the library.
  1680. This requires a patched version of GCC, supporting the
  1681. -fstack-protector[-all] options, with the __guard and
  1682. __stack_smash_handler functions removed from libgcc.
  1683. These functions are added to ldso/libc instead.
  1684. More information at:
  1685. <http://www.research.ibm.com/trl/projects/security/ssp/>
  1686. Most people will answer N.
  1687. config SSP_QUICK_CANARY
  1688. bool "Use simple guard values without accessing /dev/urandom"
  1689. depends on UCLIBC_HAS_SSP
  1690. help
  1691. Use gettimeofday(2) to define the __guard without accessing
  1692. /dev/urandom.
  1693. WARNING: This makes smashing stack protector vulnerable to timing
  1694. attacks.
  1695. Most people will answer N.
  1696. choice
  1697. prompt "Propolice protection blocking signal"
  1698. depends on UCLIBC_HAS_SSP
  1699. default PROPOLICE_BLOCK_ABRT if ! DODEBUG
  1700. default PROPOLICE_BLOCK_SEGV if DODEBUG
  1701. help
  1702. "abort" use SIGABRT to block offending programs.
  1703. This is the default implementation.
  1704. "segfault" use SIGSEGV to block offending programs.
  1705. Use this for debugging.
  1706. If unsure, answer "abort".
  1707. config PROPOLICE_BLOCK_ABRT
  1708. bool "abort"
  1709. config PROPOLICE_BLOCK_SEGV
  1710. bool "segfault"
  1711. endchoice
  1712. config UCLIBC_BUILD_SSP
  1713. bool "Build uClibc with -fstack-protector"
  1714. depends on UCLIBC_HAS_SSP
  1715. help
  1716. Build all uClibc libraries and executables with -fstack-protector,
  1717. adding extra stack overflow checking to most uClibc functions.
  1718. config UCLIBC_BUILD_RELRO
  1719. bool "Build uClibc with linker option -z RELRO"
  1720. depends on HAVE_SHARED
  1721. default y
  1722. help
  1723. Build all libraries and executables with "ld -z relro".
  1724. This tells the linker to mark chunks of an executable or shared
  1725. library read-only after applying dynamic relocations. (This comes
  1726. up when a global const variable is initialized to the address of a
  1727. function or the value of another global variable.)
  1728. This is a fairly obscure option the ld man page doesn't even bother
  1729. to document properly. It's a security paranoia issue that's more
  1730. likely to consume memory (by allocating an extra page) rather than
  1731. save it.
  1732. This is explained in more depth at
  1733. http://www.airs.com/blog/archives/189
  1734. Nobody is likely to care whether you say Y or N here.
  1735. config UCLIBC_BUILD_NOW
  1736. bool "Build uClibc with linker option -z NOW"
  1737. depends on HAVE_SHARED
  1738. help
  1739. Build all libraries and executables with "ld -z now".
  1740. This tells the linker to resolve all symbols when the library is
  1741. first loaded, rather than when each function is first called. This
  1742. increases start-up latency by a few microseconds and may do
  1743. unnecessary work (resolving symbols that are never used), but the
  1744. realtime people like it for making microbenchmark timings slightly
  1745. more predictable and in some cases it can be slightly faster due to
  1746. CPU cache behavior (not having to fault the linker back in to do
  1747. lazy symbol resolution).
  1748. Most people can't tell the difference between selecting Y or N here.
  1749. config UCLIBC_BUILD_NOEXECSTACK
  1750. bool "Build uClibc with noexecstack marking"
  1751. default y
  1752. help
  1753. Mark all assembler files as noexecstack, which will mark uClibc
  1754. as not requiring an executable stack. (This doesn't prevent other
  1755. files you link against from claiming to need an executable stack, it
  1756. just won't cause uClibc to request it unnecessarily.)
  1757. This is a security thing to make buffer overflows harder to exploit.
  1758. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1759. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1760. It only actually provides any security when combined with address
  1761. space randomization, explained here: http://lwn.net/Articles/121845/
  1762. Address space randomization is on by default in current linux
  1763. kernels (although it can be disabled using the option
  1764. CONFIG_COMPAT_BRK).
  1765. You should probably say Y.
  1766. endmenu
  1767. menu "uClibc development/debugging options"
  1768. config CROSS_COMPILER_PREFIX
  1769. string "Cross-compiling toolchain prefix"
  1770. default ""
  1771. help
  1772. The prefix used to execute your cross-compiling toolchain. For
  1773. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1774. then enter 'arm-linux-uclibc-' here.
  1775. config UCLIBC_EXTRA_CFLAGS
  1776. string "Extra CFLAGS to use to build uClibc"
  1777. default ""
  1778. help
  1779. Add any additional CFLAGS to be used to build uClibc.
  1780. config DODEBUG
  1781. bool "Build uClibc with debugging symbols"
  1782. select EXTRA_WARNINGS
  1783. help
  1784. Say Y here if you wish to compile uClibc with debugging symbols.
  1785. This will allow you to use a debugger to examine uClibc internals
  1786. while applications are running. This increases the size of the
  1787. library considerably and should only be used when doing development.
  1788. If you are doing development and want to debug uClibc, answer Y.
  1789. Otherwise, answer N.
  1790. config DODEBUG_PT
  1791. bool "Build pthread with debugging output"
  1792. depends on UCLIBC_HAS_THREADS && LINUXTHREADS_OLD
  1793. help
  1794. Enable debug output in libpthread. This is only useful when doing
  1795. development in libpthread itself.
  1796. Otherwise, answer N.
  1797. config DOSTRIP
  1798. bool "Strip libraries and executables"
  1799. default y
  1800. depends on !DODEBUG
  1801. help
  1802. Say Y here if you do wish to strip all uClibc libraries and
  1803. executables. No stripping increases the size of the binaries
  1804. considerably, but makes it possible to debug uClibc libraries.
  1805. Most people will answer Y.
  1806. config DOASSERTS
  1807. bool "Build uClibc with run-time assertion testing"
  1808. help
  1809. Say Y here to include runtime assertion tests.
  1810. This enables runtime assertion testing in some code, which can
  1811. increase the size of the library and incur runtime overhead.
  1812. If you say N, then this testing will be disabled.
  1813. config SUPPORT_LD_DEBUG
  1814. bool "Build the shared library loader with debugging support"
  1815. depends on HAVE_SHARED
  1816. help
  1817. Answer Y here to enable all the extra code needed to debug the uClibc
  1818. native shared library loader. The level of debugging noise that is
  1819. generated depends on the LD_DEBUG environment variable... Just set
  1820. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1821. debug your application. Diagnostic messages will then be printed to
  1822. the stderr.
  1823. For now these debugging tokens are available:
  1824. detail provide more information for some options
  1825. move display copy processing
  1826. symbols display symbol table processing
  1827. reloc display relocation processing; detail shows the
  1828. relocation patch
  1829. nofixups never fixes up jump relocations
  1830. bindings displays the resolve processing (function calls);
  1831. detail shows the relocation patch
  1832. all Enable everything!
  1833. The additional environment variable:
  1834. LD_DEBUG_OUTPUT=file
  1835. redirects the diagnostics to an output file created using
  1836. the specified name and the process id as a suffix.
  1837. An excellent start is simply:
  1838. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1839. or to log everything to a file named 'logfile', try this
  1840. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1841. If you are doing development and want to debug uClibc's shared library
  1842. loader, answer Y. Mere mortals answer N.
  1843. config SUPPORT_LD_DEBUG_EARLY
  1844. bool "Build the shared library loader with early debugging support"
  1845. depends on HAVE_SHARED
  1846. help
  1847. Answer Y here to if you find the uClibc shared library loader is
  1848. crashing or otherwise not working very early on. This is typical
  1849. only when starting a new port when you haven't figured out how to
  1850. properly get the values for argc, argv, environ, etc. This method
  1851. allows a degree of visibility into the very early shared library
  1852. loader initialization process. If you are doing development and want
  1853. to debug the uClibc shared library loader early initialization,
  1854. answer Y. Mere mortals answer N.
  1855. config UCLIBC_MALLOC_DEBUGGING
  1856. bool "Build malloc with debugging support"
  1857. depends on MALLOC || MALLOC_STANDARD
  1858. help
  1859. Answer Y here to compile extra debugging support code into malloc.
  1860. Malloc debugging output may then be enabled at runtime using the
  1861. MALLOC_DEBUG environment variable.
  1862. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1863. as a bitmask with the following bits:
  1864. 1 - do extra consistency checking
  1865. 2 - output messages for malloc/free calls and OS
  1866. allocation calls
  1867. 4 - output messages for the `MMB' layer
  1868. 8 - output messages for internal malloc heap manipulation
  1869. calls
  1870. Because this increases the size of malloc appreciably (due to strings
  1871. etc), you should say N unless you need to debug a malloc problem.
  1872. config UCLIBC_HAS_BACKTRACE
  1873. bool "Add support for application self-debugging"
  1874. depends on HAVE_SHARED
  1875. help
  1876. Answer Y here to compile support for application self-debugging, by adding
  1877. a new shared object "libubacktrace.so" that provides the following new
  1878. functions:
  1879. backtrace, backtrace_symbols, backtrace_symbols_fd
  1880. The backtrace functionality is currently supported on SH platform, and it
  1881. based on dwarf2 informations to properly work, so any application that
  1882. want to use backtrace needs to be built with -fexceptions flag.
  1883. The symbol names may be unavailable without the use of special linker
  1884. options. For systems using the GNU linker, it is necessary to use the
  1885. -rdynamic linker option too. Note that names of "static" functions are not
  1886. exposed, and won't be available in the backtrace.
  1887. config WARNINGS
  1888. string "Compiler Warnings"
  1889. default "-Wall"
  1890. help
  1891. Set this to the set of compiler warnings you wish to see while compiling.
  1892. config EXTRA_WARNINGS
  1893. bool "Enable extra annoying warnings"
  1894. help
  1895. If you wish to build with extra warnings enabled, say Y here.
  1896. config DOMULTI
  1897. bool "Compile all sources at once into an object"
  1898. help
  1899. Set this to compile all sources at once into an object (IMA).
  1900. This mode of compilation uses alot of memory but may produce
  1901. smaller binaries.
  1902. Note that you need a very recent GCC for this to work, like
  1903. gcc >= 4.3 plus eventually some patches.
  1904. If unsure, keep the default of N.
  1905. config UCLIBC_MJN3_ONLY
  1906. bool "Manuel's hidden warnings"
  1907. help
  1908. Answer Y here to see all Manuel's personal notes, warnings, and todos.
  1909. Most people will answer N.
  1910. endmenu