Config.in 72 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. default n
  186. config DOPIC
  187. bool "Generate only Position Independent Code (PIC)"
  188. default y
  189. depends on !HAVE_NO_PIC
  190. help
  191. If you wish to build all of uClibc as PIC objects, then answer Y here.
  192. If you are unsure, then you should answer N.
  193. config ARCH_HAS_NO_SHARED
  194. bool
  195. default n
  196. config ARCH_HAS_NO_LDSO
  197. bool
  198. select ARCH_HAS_NO_SHARED
  199. default n
  200. config HAVE_SHARED
  201. bool "Enable shared libraries"
  202. depends on !ARCH_HAS_NO_SHARED
  203. default y
  204. help
  205. If you wish to build uClibc with support for shared libraries then
  206. answer Y here. If you only want to build uClibc as a static library,
  207. then answer N.
  208. config FORCE_SHAREABLE_TEXT_SEGMENTS
  209. bool "Only load shared libraries which can share their text segment"
  210. depends on HAVE_SHARED
  211. select DOPIC
  212. default n
  213. help
  214. If you answer Y here, the uClibc native shared library loader will
  215. only load shared libraries, which do not need to modify any
  216. non-writable segments. These libraries haven't set the DT_TEXTREL
  217. tag in the dynamic section (==> objdump).
  218. All your libraries must be compiled with -fPIC or -fpic, and all
  219. assembler function must be written as position independent code (PIC).
  220. Enabling this option will make uClibc's shared library loader a
  221. little bit smaller and guarantee that no memory will be wasted by
  222. badly coded shared libraries.
  223. config LDSO_LDD_SUPPORT
  224. bool "Native 'ldd' support"
  225. depends on HAVE_SHARED
  226. default y
  227. help
  228. Enable all the code needed to support traditional ldd,
  229. which executes the shared library loader to resolve all dependencies
  230. and then provide a list of shared libraries that are required for an
  231. application to function. Disabling this option will make uClibc's
  232. shared library loader a little bit smaller.
  233. Most people will answer Y.
  234. config LDSO_CACHE_SUPPORT
  235. bool "Enable library loader cache (ld.so.conf)"
  236. depends on HAVE_SHARED
  237. default y
  238. help
  239. Enable this to make use of /etc/ld.so.conf, the shared library loader
  240. cache configuration file to support for non-standard library paths.
  241. After updating this file, it is necessary to run 'ldconfig' to update
  242. the /etc/ld.so.cache shared library loader cache file.
  243. config LDSO_PRELOAD_ENV_SUPPORT
  244. bool "Enable library loader LD_PRELOAD environment"
  245. depends on HAVE_SHARED
  246. default y
  247. help
  248. Enable this to make use of LD_PRELOAD environment variable.
  249. A whitespace-separated list of additional, user-specified, ELF shared
  250. libraries to be loaded before all others. This can be used to
  251. selectively override functions in other shared libraries. For
  252. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  253. search directories that are also set-user-ID will be loaded.
  254. config LDSO_PRELOAD_FILE_SUPPORT
  255. bool "Enable library loader preload file (ld.so.preload)"
  256. depends on HAVE_SHARED
  257. default n
  258. help
  259. Enable this to make use of /etc/ld.so.preload. This file contains a
  260. whitespace separated list of shared libraries to be loaded before
  261. the program.
  262. config LDSO_BASE_FILENAME
  263. string "Shared library loader naming prefix"
  264. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  265. default "ld.so"
  266. help
  267. If you wish to support both uClibc and glibc on the same system, it
  268. is necessary to set this to something other than "ld.so" to avoid
  269. conflicts with glibc, which also uses "ld.so". This prevents both
  270. libraries from using the same /etc/ld.so.* files. If you wish to
  271. support both uClibc and glibc on the same system then you should set
  272. this to "ld-uClibc.so".
  273. Most people will leave this set to the default of "ld.so".
  274. WARNING: Changing the default prefix could cause problems with
  275. binutils' ld !
  276. config UCLIBC_STATIC_LDCONFIG
  277. bool "Link ldconfig statically"
  278. depends on HAVE_SHARED
  279. default y
  280. help
  281. Enable this option to statically link the ldconfig binary.
  282. Making ldconfig static can be beneficial if you have a library
  283. problem and need to use ldconfig to recover. Sometimes it is
  284. preferable to instead keep the size of the system down, in which
  285. case you should disable this option.
  286. config LDSO_RUNPATH
  287. bool "Enable ELF RUNPATH tag support"
  288. depends on HAVE_SHARED
  289. default y if LDSO_CACHE_SUPPORT
  290. default n if !LDSO_CACHE_SUPPORT
  291. help
  292. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  293. which extend the library search paths. They are really only useful
  294. if a package installs libraries in non standard locations and
  295. ld.so.conf support is disabled.
  296. Usage of RUNPATH tags is not too common, so disabling this feature
  297. should be safe for most people.
  298. config LDSO_SEARCH_INTERP_PATH
  299. bool "Add ldso path to lib search path"
  300. depends on HAVE_SHARED
  301. default y
  302. help
  303. The ldso is told where it is being executed from and can use that
  304. path to find related core libraries. This is useful by default,
  305. but can be annoying in a mixed development environment.
  306. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  307. library search with /foo/boo/
  308. If unsure, simply say Y here.
  309. config UCLIBC_CTOR_DTOR
  310. bool "Support global constructors and destructors"
  311. default y
  312. help
  313. If you wish to build uClibc with support for global constructor
  314. (ctor) and global destructor (dtor) support, then answer Y here.
  315. When ctor/dtor support is enabled, binaries linked with uClibc must
  316. also be linked with crtbegin.o and crtend.o which are provided by gcc
  317. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  318. may need to be adjusted to include these files). This support will
  319. also add a small amount of additional size to each binary compiled vs
  320. uClibc. If you will be using uClibc with C++, or if you need the gcc
  321. __attribute__((constructor)) and __attribute__((destructor)) to work,
  322. then you definitely want to answer Y here. If you don't need ctors
  323. or dtors and want your binaries to be as small as possible, then
  324. answer N.
  325. config LDSO_GNU_HASH_SUPPORT
  326. bool "Enable GNU hash style support"
  327. depends on HAVE_SHARED
  328. default n
  329. help
  330. Newest binutils support a new hash style named GNU-hash. The dynamic
  331. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  332. if present into the ELF binaries, otherwise it will use the old SysV
  333. hash style (.hash). This ensures that it is completely backward
  334. compatible.
  335. Further, being the hash table implementation self-contained into each
  336. executable and shared libraries, objects with mixed hash style can
  337. peacefully coexist in the same process.
  338. If you want to use this new feature, answer Y
  339. choice
  340. prompt "Thread support"
  341. #default UCLIBC_HAS_THREADS_NATIVE if (TARGET_alpha || TARGET_arm || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_sh || TARGET_sh64)
  342. default HAS_NO_THREADS
  343. help
  344. If you want to compile uClibc with pthread support, then answer Y.
  345. This will increase the size of uClibc by adding a bunch of locking
  346. to critical data structures, and adding extra code to ensure that
  347. functions are properly reentrant.
  348. config HAS_NO_THREADS
  349. bool "none"
  350. help
  351. Disable thread support.
  352. config LINUXTHREADS_OLD
  353. bool "older (stable) version of linuxthreads"
  354. # linuxthreads and linuxthreads.old need nanosleep()
  355. select UCLIBC_HAS_REALTIME
  356. help
  357. There are two versions of linuxthreads. The older (stable) version
  358. has been in uClibc for quite a long time but hasn't seen too many
  359. updates other than bugfixes.
  360. config LINUXTHREADS_NEW
  361. bool "slightly newer version of linuxthreads"
  362. help
  363. The new version has not been tested much, and lacks ports for arches
  364. which glibc does not support (like bfin/frv/etc...), but is based on
  365. the latest code from glibc, so it may be the only choice for the
  366. newer ports (like alpha/amd64/64bit arches and hppa).
  367. config UCLIBC_HAS_THREADS_NATIVE
  368. bool "Native POSIX Threading (NPTL)"
  369. select UCLIBC_HAS_TLS
  370. select UCLIBC_HAS_STDIO_FUTEXES
  371. # NPTL local:
  372. select EXTRA_WARNINGS
  373. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  374. depends on !CONFIG_386
  375. help
  376. If you want to compile uClibc with NPTL support, then answer Y.
  377. IMPORTANT NOTE! NPTL requires a Linux 2.6 kernel, binutils
  378. at least version 2.16 and GCC with at least version 4.1.0. NPTL
  379. will not work with older versions of any above sources. If you
  380. ignore any of these guidelines, you do so at your own risk. Do
  381. not ask for help on any of the development mailing lists.
  382. !!!! WARNING !!!! BIG FAT WARNING !!!! REALLY BIG FAT WARNING !!!!
  383. This is experimental code and at times it may not even build and
  384. even if it does it might decide to do random damage. This code is
  385. potentially hazardous to your health and sanity. It will remain
  386. that way until further notice at which point this notice will
  387. disappear. Thank you for your support and for not smoking.
  388. endchoice
  389. config UCLIBC_HAS_THREADS
  390. def_bool y if !HAS_NO_THREADS
  391. config UCLIBC_HAS_TLS
  392. bool "Thread-Local Storage"
  393. depends on UCLIBC_HAS_THREADS_NATIVE
  394. default n
  395. help
  396. If you want to enable TLS support then answer Y.
  397. This is fast an efficient way to store per-thread local data
  398. which is not on stack. It needs __thread support enabled in
  399. gcc.
  400. config PTHREADS_DEBUG_SUPPORT
  401. bool "Build pthreads debugging support"
  402. default n
  403. depends on UCLIBC_HAS_THREADS
  404. help
  405. Say Y here if you wish to be able to debug applications that use
  406. uClibc's pthreads library. By enabling this option, a library
  407. named libthread_db will be built. This library will be dlopen()'d
  408. by gdb and will allow gdb to debug the threads in your application.
  409. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  410. you must compile gdb with uClibc in order for pthread debugging to
  411. work properly.
  412. If you are doing development and want to debug applications using
  413. uClibc's pthread library, answer Y. Otherwise, answer N.
  414. config UCLIBC_HAS_SYSLOG
  415. bool "Syslog support"
  416. default y
  417. depends on UCLIBC_HAS_NETWORK_SUPPORT
  418. select UCLIBC_HAS_SOCKET
  419. help
  420. Support sending messages to the system logger.
  421. This requires socket-support.
  422. config UCLIBC_HAS_LFS
  423. bool "Large File Support"
  424. default y
  425. help
  426. If you wish to build uClibc with support for accessing large files
  427. (i.e. files greater then 2 GiB) then answer Y. Do not enable this
  428. if you are using an older Linux kernel (2.0.x) that lacks large file
  429. support. Enabling this option will increase the size of uClibc.
  430. choice
  431. prompt "Malloc Implementation"
  432. default MALLOC if ! ARCH_USE_MMU
  433. default MALLOC_STANDARD if ARCH_USE_MMU
  434. config MALLOC
  435. bool "malloc"
  436. help
  437. "malloc" use mmap for all allocations and so works very well on
  438. MMU-less systems that do not support the brk() system call. It is
  439. pretty smart about reusing already allocated memory, and minimizing
  440. memory wastage.
  441. This is the default for uClinux MMU-less systems.
  442. config MALLOC_SIMPLE
  443. bool "malloc-simple"
  444. help
  445. "malloc-simple" is trivially simple and slow as molasses. It
  446. was written from scratch for uClibc, and is the simplest possible
  447. (and therefore smallest) malloc implementation.
  448. This uses only the mmap() system call to allocate and free memory,
  449. and does not use the brk() system call at all, making it a fine
  450. choice for MMU-less systems with very limited memory. It's 100%
  451. standards compliant, thread safe, very small, and releases freed
  452. memory back to the OS immediately rather than keeping it in the
  453. process's heap for reallocation. It is also VERY SLOW.
  454. config MALLOC_STANDARD
  455. bool "malloc-standard"
  456. depends on ARCH_USE_MMU
  457. help
  458. "malloc-standard" is derived from the public domain dlmalloc
  459. implementation by Doug Lea. It is quite fast, and is pretty smart
  460. about reusing already allocated memory, and minimizing memory
  461. wastage. This uses brk() for small allocations, while using mmap()
  462. for larger allocations. This is the default malloc implementation
  463. for uClibc.
  464. If unsure, answer "malloc-standard".
  465. endchoice
  466. config MALLOC_GLIBC_COMPAT
  467. bool "Malloc returns live pointer for malloc(0)"
  468. default n
  469. help
  470. The behavior of malloc(0) is listed as implementation-defined by
  471. SuSv3. Glibc returns a valid pointer to something, while uClibc
  472. normally returns NULL. I personally feel glibc's behavior is
  473. not particularly safe, and allows buggy applications to hide very
  474. serious problems.
  475. When this option is enabled, uClibc will act just like glibc, and
  476. return a live pointer when someone calls malloc(0). This pointer
  477. provides a malloc'ed area with a size of 1 byte. This feature is
  478. mostly useful when dealing with applications using autoconf's broken
  479. AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
  480. does not detect glibc style returning-a-valid-pointer-for-malloc(0)
  481. behavior). Most people can safely answer N.
  482. config UCLIBC_DYNAMIC_ATEXIT
  483. bool "Dynamic atexit() Support"
  484. default y
  485. help
  486. When this option is enabled, uClibc will support an infinite number,
  487. of atexit() and on_exit() functions, limited only by your available
  488. memory. This can be important when uClibc is used with C++, since
  489. global destructors are implemented via atexit(), and it is quite
  490. possible to exceed the default number when this option is disabled.
  491. Enabling this option adds a few bytes, and more significantly makes
  492. atexit and on_exit depend on malloc, which can be bad when compiling
  493. static executables.
  494. Unless you use uClibc with C++, you should probably answer N.
  495. config COMPAT_ATEXIT
  496. bool "Old (visible) atexit Support"
  497. default n
  498. help
  499. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  500. else you will be missing atexit() until you rebuild all apps.
  501. config UCLIBC_SUSV3_LEGACY
  502. bool "Enable SuSv3 LEGACY functions"
  503. default n
  504. #vfork,
  505. # h_errno
  506. # gethostbyaddr
  507. # gethostbyname
  508. help
  509. Enable this option if you want to have SuSv3 LEGACY functions
  510. in the library, else they are replaced by SuSv3 proposed macros.
  511. Currently applies to:
  512. bcmp, bcopy, bzero, index, rindex, ftime,
  513. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  514. (getwd), (makecontext),
  515. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  516. scalb, (setcontext), (swapcontext), ualarm, usleep,
  517. wcswcs.
  518. WARNING! ABI incompatibility.
  519. config UCLIBC_SUSV3_LEGACY_MACROS
  520. bool "Enable SuSv3 LEGACY macros"
  521. default n
  522. help
  523. Enable this option if you want to have SuSv3 LEGACY macros.
  524. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  525. WARNING! ABI incompatibility.
  526. config UCLIBC_SUSV4_LEGACY
  527. bool "Enable SuSv4 LEGACY or obsolescent functions"
  528. default n
  529. help
  530. Enable this option if you want to have SuSv4 LEGACY functions
  531. and macros in the library.
  532. Currently applies to:
  533. - XSI functions:
  534. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  535. gettimeofday, isascii, pthread_getconcurrency,
  536. pthread_setconcurrency, setitimer, setpgrp, sighold,
  537. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  538. tempnam, toascii, ulimit.
  539. - Base functions:
  540. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  541. tmpnam, utime.
  542. WARNING! ABI incompatibility.
  543. config UCLIBC_STRICT_HEADERS
  544. bool "Enable structures and constants for unsupported features"
  545. default n
  546. help
  547. Enable structures and constants in headers that should not be used,
  548. because the respective feature is disabled.
  549. WARNING! enabling this option requires to patch many faulty apps,
  550. since they make (wrongly) use of these structures/constants,
  551. although the feature was disabled.
  552. config UCLIBC_HAS_STUBS
  553. bool "Provide stubs for unavailable functionality"
  554. default n
  555. help
  556. With this option uClibc provides non-functional stubs for
  557. functions which are impossible to implement on the target
  558. architecture. Otherwise, such functions are simply omitted.
  559. config UCLIBC_HAS_SHADOW
  560. bool "Shadow Password Support"
  561. default y
  562. help
  563. Answer N if you do not need shadow password support.
  564. Most people will answer Y.
  565. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  566. bool "Support for program_invocation_name"
  567. default n
  568. help
  569. Support for the GNU-specific program_invocation_name and
  570. program_invocation_short_name strings. Some GNU packages
  571. (like tar and coreutils) utilize these for extra useful
  572. output, but in general are not required.
  573. At startup, these external strings are automatically set
  574. up based on the value of ARGV[0].
  575. If unsure, just answer N.
  576. config UCLIBC_HAS___PROGNAME
  577. bool "Support for __progname"
  578. default y
  579. depends on UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  580. help
  581. Some packages (like openssh) like to peek into internal libc
  582. symbols to make their output a bit more user friendly.
  583. At startup, __progname is automatically set up based on the
  584. value of ARGV[0].
  585. If unsure, just answer N.
  586. config UCLIBC_HAS_PTY
  587. bool "Support for pseudo-terminals"
  588. default y
  589. help
  590. This enables support for pseudo-terminals (see man 4 pts
  591. and man 7 pty).
  592. If unsure, just answer Y.
  593. config ASSUME_DEVPTS
  594. bool "Assume that /dev/pts is a devpts or devfs file system"
  595. default y
  596. depends on UCLIBC_HAS_PTY
  597. help
  598. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  599. these filesystems automatically manage permissions on the /dev/pts
  600. devices. You may need to mount your devpts or devfs filesystem on
  601. /dev/pts for this to work.
  602. Most people should answer Y.
  603. config UNIX98PTY_ONLY
  604. bool "Support only Unix 98 PTYs"
  605. default y
  606. depends on UCLIBC_HAS_PTY
  607. help
  608. If you want to support only Unix 98 PTYs enable this. Some older
  609. applications may need this disabled and will thus use legacy BSD
  610. style PTY handling which is more complex and also bigger than
  611. Unix 98 PTY handling.
  612. For most current programs, you can generally answer Y.
  613. if UNIX98PTY_ONLY
  614. config UCLIBC_HAS_GETPT
  615. bool "Support getpt() (glibc-compat)"
  616. default n
  617. depends on UCLIBC_HAS_PTY
  618. help
  619. Some packages may need getpt().
  620. All of those are non-standard and can be considered
  621. GNU/libc compatibility.
  622. Either use posix_openpt() or just open /dev/ptmx yourself.
  623. If unsure, just say N.
  624. endif
  625. if !UNIX98PTY_ONLY
  626. # Have to use __libc_ptyname{1,2}[] and related bloat
  627. config UCLIBC_HAS_GETPT
  628. def_bool y
  629. endif
  630. config UCLIBC_HAS_LIBUTIL
  631. bool "Provide libutil library and functions"
  632. depends on UCLIBC_HAS_PTY
  633. default n
  634. help
  635. Provide a libutil library.
  636. This non-standard conforming library provides the following
  637. utility functions:
  638. forkpty(): combines openpty(), fork(2), and login_tty() to
  639. create a new process operating in a pseudo-terminal.
  640. login(): write utmp and wtmp entries
  641. login_tty(): prepares for a login on the tty fd by creating a
  642. new session, making fd the controlling terminal for
  643. the calling process, setting fd to be the standard
  644. input, output, and error streams of the current
  645. process, and closing fd.
  646. logout(): write utmp and wtmp entries
  647. logwtmp(): constructs a utmp structure and calls updwtmp() to
  648. append the structure to the utmp file.
  649. openpty(): finds an available pseudo-terminal and returns
  650. file descriptors for the master and slave
  651. This library adds about 3k-4k to your system.
  652. config UCLIBC_HAS_TM_EXTENSIONS
  653. bool "Support 'struct tm' timezone extension fields"
  654. default y
  655. help
  656. Enabling this option adds fields to 'struct tm' in time.h for
  657. tracking the number of seconds east of UTC, and an abbreviation for
  658. the current timezone. These fields are not specified by the SuSv3
  659. standard, but they are commonly used in both GNU and BSD application
  660. code.
  661. To strictly follow the SuSv3 standard, leave this disabled.
  662. Most people will probably want to answer Y.
  663. config UCLIBC_HAS_TZ_CACHING
  664. bool "Enable caching of the last valid timezone 'TZ' string"
  665. default y
  666. help
  667. Answer Y to enable caching of the last valid 'TZ' string describing
  668. the timezone setting. This allows a quick string compare to avoid
  669. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  670. Most people will answer Y.
  671. config UCLIBC_HAS_TZ_FILE
  672. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  673. default y
  674. help
  675. Answer Y to enable the setting of a default timezone for uClibc.
  676. Ordinarily, uClibc gets the timezone information exclusively from the
  677. 'TZ' environment variable. In particular, there is no support for
  678. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  679. With this option enabled, uClibc will use the value stored in the
  680. file '/etc/TZ' (default path) to obtain timezone information if the
  681. 'TZ' environment variable is missing or has an invalid value. The
  682. file consists of a single line (newline required) of text describing
  683. the timezone in the format specified for the TZ environment variable.
  684. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  685. See
  686. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  687. for details on valid settings of 'TZ'.
  688. Most people will answer Y.
  689. config UCLIBC_HAS_TZ_FILE_READ_MANY
  690. bool "Repeatedly read the '/etc/TZ' file"
  691. depends on UCLIBC_HAS_TZ_FILE
  692. default y
  693. help
  694. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  695. a valid value has been read. This incurs the overhead of an
  696. open/read/close for each tzset() call (explicit or implied). However,
  697. setting this will allow applications to update their timezone
  698. information if the contents of the file change.
  699. Most people will answer Y.
  700. config UCLIBC_TZ_FILE_PATH
  701. string "Path to the 'TZ' file for setting the global timezone"
  702. depends on UCLIBC_HAS_TZ_FILE
  703. default "/etc/TZ"
  704. help
  705. This is the path to the 'TZ' file.
  706. Most people will use the default of '/etc/TZ'.
  707. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  708. bool "Use /etc/localtime as a fallback"
  709. depends on UCLIBC_HAS_TZ_FILE
  710. default y
  711. help
  712. Answer Y to try to use /etc/localtime file.
  713. On glibc systems this file (if it is in TZif2 format)
  714. contains timezone string at the end.
  715. Most people will answer Y.
  716. endmenu
  717. menu "Advanced Library Settings"
  718. config UCLIBC_PWD_BUFFER_SIZE
  719. int "Buffer size for getpwnam() and friends"
  720. default 256
  721. range 12 1024
  722. help
  723. This sets the value of the buffer size for getpwnam() and friends.
  724. By default, this is 256. (For reference, glibc uses 1024).
  725. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  726. parameter.
  727. config UCLIBC_GRP_BUFFER_SIZE
  728. int "Buffer size for getgrnam() and friends"
  729. default 256
  730. range 12 1024
  731. help
  732. This sets the value of the buffer size for getgrnam() and friends.
  733. By default, this is 256. (For reference, glibc uses 1024).
  734. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  735. parameter.
  736. comment "Support various families of functions"
  737. config UCLIBC_LINUX_MODULE_24
  738. bool "Linux kernel module functions"
  739. default !(TARGET_bfin)
  740. help
  741. create_module, query_module
  742. are used in linux (prior to 2.6) for loadable kernel modules.
  743. Say N if you do not use kernel modules, or you only support
  744. Linux 2.6+.
  745. config UCLIBC_LINUX_SPECIFIC
  746. bool "Linux specific functions"
  747. default y
  748. help
  749. capget(), capset(), fstatfs(), inotify_*(), ioperm(), iopl(),
  750. madvise(), modify_ldt(), personality(), prctl()/arch_prctl(),
  751. ppoll(), readahead(), reboot(), remap_file_pages(),
  752. sched_getaffinity(), sched_setaffinity(), sendfile(),
  753. setfsgid(), setfsuid(), setresuid(),
  754. splice(), vmsplice(), tee(), signalfd(), swapoff(), swapon(),
  755. sync_file_range(), sysctl(), sysinfo(), vhangup()
  756. config UCLIBC_HAS_GNU_ERROR
  757. bool "Support GNU extensions for error-reporting"
  758. default y
  759. help
  760. Support for the GNU-specific error(), error_at_line(),
  761. void (* error_print_progname)(), error_message_count
  762. functions and variables. Some GNU packages
  763. utilize these for extra useful output, but in general
  764. are not required.
  765. If unsure, just answer N.
  766. config UCLIBC_BSD_SPECIFIC
  767. bool "BSD specific functions"
  768. default y
  769. help
  770. mincore(), getdomainname(), setdomainname()
  771. If unsure, say N.
  772. config UCLIBC_HAS_BSD_ERR
  773. bool "BSD err functions"
  774. default y
  775. help
  776. These functions are non-standard BSD extensions.
  777. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  778. If unsure, say N.
  779. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  780. bool "BSD obsolete signal functions"
  781. default n
  782. help
  783. These functions are provided as a compatibility interface for
  784. programs that make use of the historical System V signal API.
  785. This API is obsolete:
  786. new applications should use the POSIX signal API (sigaction(2),
  787. sigprocmask(2), etc.).
  788. Affected functions:
  789. sigset(), sighold(), sigrelse(), sigignore()
  790. If unsure, say N.
  791. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  792. bool "SYSV obsolete signal functions"
  793. default n
  794. help
  795. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  796. If unsure, say N.
  797. config UCLIBC_NTP_LEGACY
  798. bool "ntp_*() aliases"
  799. default n
  800. help
  801. Provide legacy aliases for ntp functions:
  802. ntp_adjtime(), ntp_gettime()
  803. It is safe to say N here.
  804. config UCLIBC_SV4_DEPRECATED
  805. bool "Enable SVr4 deprecated functions"
  806. default n
  807. help
  808. These functions are DEPRECATED in System V release 4.
  809. Say N unless you desparately need one of the functions below:
  810. ustat() [use statfs(2) in your code instead]
  811. config UCLIBC_HAS_REALTIME
  812. bool "Realtime-related family of SUSv functions"
  813. default y
  814. help
  815. These functions are part of the Timers option and need not
  816. be available on all implementations.
  817. Includes AIO, message-queue, scheduler, semaphore functions:
  818. aio.h
  819. mqueue.h
  820. sched.h
  821. semaphore.h
  822. aio_cancel()
  823. aio_error()
  824. aio_fsync()
  825. aio_read()
  826. lio_listio()
  827. aio_return()
  828. aio_suspend()
  829. aio_write()
  830. clock_getres(), clock_gettime(), clock_settime()
  831. fdatasync()
  832. mlockall(), munlockall()
  833. mlock(), munlock()
  834. mq_close()
  835. mq_getattr()
  836. mq_notify()
  837. mq_open()
  838. mq_receive()
  839. mq_send()
  840. mq_setattr()
  841. mq_unlink()
  842. nanosleep()
  843. sched_getparam()
  844. sched_get_priority_max(), sched_get_priority_min()
  845. sched_getscheduler()
  846. sched_rr_get_interval()
  847. sched_setparam()
  848. sched_setscheduler()
  849. sem_close()
  850. sem_destroy()
  851. sem_getvalue()
  852. sem_init()
  853. sem_open()
  854. sem_post()
  855. sem_trywait(), sem_wait()
  856. sem_unlink()
  857. sigqueue()
  858. sigtimedwait(), sigwaitinfo()
  859. timer_create()
  860. timer_delete()
  861. timer_getoverrun(), timer_gettime(), timer_settime()
  862. config UCLIBC_HAS_ADVANCED_REALTIME
  863. bool "Advanced realtime-related family of SUSv functions"
  864. default y
  865. depends on UCLIBC_HAS_REALTIME
  866. help
  867. These functions are part of the Timers option and need not
  868. be available on all implementations.
  869. clock_getcpuclockid()
  870. clock_nanosleep()
  871. mq_timedreceive()
  872. mq_timedsend()
  873. posix_fadvise()
  874. posix_fallocate()
  875. posix_madvise()
  876. posix_memalign()
  877. posix_mem_offset()
  878. posix_spawnattr_destroy(), posix_spawnattr_init()
  879. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  880. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  881. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  882. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  883. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  884. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  885. posix_spawn_file_actions_addclose()
  886. posix_spawn_file_actions_adddup2()
  887. posix_spawn_file_actions_addopen()
  888. posix_spawn_file_actions_destroy()
  889. posix_spawn_file_actions_init()
  890. posix_spawn()
  891. posix_spawnp()
  892. posix_typed_mem_get_info()
  893. pthread_mutex_timedlock()
  894. sem_timedwait()
  895. #config UCLIBC_HAS_TERMIOS
  896. # bool "termios functions"
  897. # default y
  898. # help
  899. # Get and set terminal attributes, line control, get and set baud
  900. # rate.
  901. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  902. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  903. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  904. #
  905. # If unsure, say Y.
  906. config UCLIBC_HAS_EPOLL
  907. bool "epoll"
  908. default y
  909. help
  910. epoll_create(), epoll_ctl(), epoll_wait() functions.
  911. config UCLIBC_HAS_XATTR
  912. bool "Extended Attributes"
  913. default y
  914. help
  915. Extended Attributes support.
  916. setxattr()
  917. lsetxattr()
  918. fsetxattr()
  919. getxattr()
  920. lgetxattr()
  921. fgetxattr()
  922. listxattr()
  923. llistxattr()
  924. flistxattr()
  925. removexattr()
  926. lremovexattr()
  927. fremovexattr()
  928. Say N unless you need support for extended attributes and the
  929. filesystems do actually support them.
  930. config UCLIBC_HAS_PROFILING
  931. bool "Profiling support"
  932. default y
  933. help
  934. gcc's -finstrument-functions needs these.
  935. Most people can safely answer N.
  936. config UCLIBC_HAS_CRYPT_IMPL
  937. bool "libcrypt support"
  938. default y
  939. help
  940. libcrypt contains crypt(), setkey() and encrypt()
  941. config UCLIBC_HAS_CRYPT_STUB
  942. bool "libcrypt stubs"
  943. default y
  944. depends on !UCLIBC_HAS_CRYPT_IMPL
  945. help
  946. Standards mandate that crypt(3) provides a stub if it is unavailable.
  947. If you enable this option then stubs for
  948. crypt(), setkey() and encrypt()
  949. will be provided in a small libcrypt.
  950. config UCLIBC_HAS_CRYPT
  951. def_bool y
  952. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  953. endmenu
  954. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  955. bool "Networking Support"
  956. default y
  957. help
  958. Say N here if you do not need network support.
  959. if UCLIBC_HAS_NETWORK_SUPPORT
  960. config UCLIBC_HAS_SOCKET
  961. bool "Socket support"
  962. default y
  963. help
  964. If you want to include support for sockets then answer Y.
  965. config UCLIBC_HAS_IPV4
  966. bool "IP version 4 support"
  967. default y
  968. select UCLIBC_HAS_SOCKET
  969. help
  970. If you want to include support for the Internet Protocol
  971. (IP version 4) then answer Y.
  972. Most people will say Y.
  973. config UCLIBC_HAS_IPV6
  974. bool "IP version 6 support"
  975. default n
  976. select UCLIBC_HAS_SOCKET
  977. help
  978. If you want to include support for the next version of the Internet
  979. Protocol (IP version 6) then answer Y.
  980. Most people should answer N.
  981. config UCLIBC_HAS_RPC
  982. bool "Remote Procedure Call (RPC) support"
  983. default n
  984. # RPC+socket-ipvX doesn't currently work.
  985. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  986. help
  987. If you want to include RPC support, enable this. RPC is rarely used
  988. for anything except for the NFS filesystem. Unless you plan to use
  989. NFS, you can probably leave this set to N and save some space.
  990. If you need to use NFS then you should answer Y.
  991. config UCLIBC_HAS_FULL_RPC
  992. bool "Full RPC support"
  993. depends on UCLIBC_HAS_RPC
  994. default y if !HAVE_SHARED
  995. help
  996. Normally we enable just enough RPC support for things like rshd and
  997. nfs mounts to work. If you find you need the rest of the RPC stuff,
  998. then enable this option. Most people can safely answer N.
  999. config UCLIBC_HAS_REENTRANT_RPC
  1000. bool "Reentrant RPC support"
  1001. depends on UCLIBC_HAS_RPC
  1002. default y if !HAVE_SHARED
  1003. help
  1004. Most packages utilize the normal (non-reentrant) RPC functions, but
  1005. some (like exportfs from nfs-utils) need these reentrant versions.
  1006. Most people can safely answer N.
  1007. config UCLIBC_USE_NETLINK
  1008. bool "Use netlink to query interfaces"
  1009. default n
  1010. depends on UCLIBC_HAS_SOCKET
  1011. help
  1012. In newer versions of Linux (2.4.17+), support was added for querying
  1013. network device information via netlink rather than the old style
  1014. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1015. it is smaller than netlink), but if you find that not all of your
  1016. devices are being returned by the if_nameindex() function, you will
  1017. have to use the netlink implementation.
  1018. Most people can safely answer N.
  1019. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1020. bool "Support the AI_ADDRCONFIG flag"
  1021. depends on UCLIBC_USE_NETLINK
  1022. default n
  1023. help
  1024. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1025. implementation using netlink to query interfaces to find both
  1026. ipv4 and ipv6 support. This is only needed if an application uses
  1027. the AI_ADDRCONFIG flag.
  1028. Most people can safely answer N.
  1029. config UCLIBC_HAS_BSD_RES_CLOSE
  1030. bool "Support res_close() (bsd-compat)"
  1031. default n
  1032. help
  1033. Answer Y if you desperately want to support BSD compatibility in
  1034. the network code.
  1035. Most people will say N.
  1036. config UCLIBC_HAS_COMPAT_RES_STATE
  1037. bool "Use compatible but bloated _res"
  1038. default y
  1039. help
  1040. Answer Y if you build network utilities and they muck with resolver
  1041. internals a lot (_res global structure). uclibc does not use most
  1042. of _res.XXX fields, and with this option OFF they won't even exist.
  1043. Which will make e.g. dig build fail.
  1044. Answering N saves around 400 bytes in bss.
  1045. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1046. bool "Use extra compatible but extra bloated _res"
  1047. default n
  1048. help
  1049. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1050. As far as I can say, this should never be needed.
  1051. config UCLIBC_HAS_LIBRESOLV_STUB
  1052. bool "Provide libresolv stub"
  1053. default n
  1054. help
  1055. Provide a dummy resolv library.
  1056. config UCLIBC_HAS_LIBNSL_STUB
  1057. bool "Provide libnsl stub"
  1058. default n
  1059. help
  1060. Provide a dummy nsl library.
  1061. endif
  1062. menu "String and Stdio Support"
  1063. config UCLIBC_HAS_STRING_GENERIC_OPT
  1064. bool "Use faster (but larger) generic string functions"
  1065. default y
  1066. help
  1067. Answer Y to use the (tweaked) glibc generic string functions.
  1068. In general, they are faster (but 3-5K larger) than the base
  1069. uClibc string functions which are optimized solely for size.
  1070. Many people will answer Y.
  1071. config UCLIBC_HAS_STRING_ARCH_OPT
  1072. bool "Use arch-specific assembly string functions (where available)"
  1073. default y
  1074. help
  1075. Answer Y to use any archtecture-specific assembly language string
  1076. functions available for this target plaform.
  1077. Note that assembly implementations are not available for all string
  1078. functions, so some generic (written in C) string functions may
  1079. still be used.
  1080. These are small and fast, the only reason _not_ to say Y here is
  1081. for debugging purposes.
  1082. config UCLIBC_HAS_CTYPE_TABLES
  1083. bool "Use Table Versions Of 'ctype.h' Functions."
  1084. default y
  1085. help
  1086. Answer Y to use table versions of the 'ctype.h' functions.
  1087. While the non-table versions are often smaller when building
  1088. statically linked apps, they work only in stub locale mode.
  1089. Most people will answer Y.
  1090. config UCLIBC_HAS_CTYPE_SIGNED
  1091. bool "Support Signed Characters In 'ctype.h' Functions."
  1092. depends on UCLIBC_HAS_CTYPE_TABLES
  1093. default y
  1094. help
  1095. Answer Y to enable support for passing signed char values to
  1096. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1097. these functions are only defined for unsigned char values and
  1098. EOF. However, glibc allows negative signed char values as well
  1099. in order to support 'broken old programs'.
  1100. Most people will answer Y.
  1101. choice
  1102. prompt "ctype argument checking"
  1103. depends on UCLIBC_HAS_CTYPE_TABLES
  1104. default UCLIBC_HAS_CTYPE_UNSAFE
  1105. help
  1106. Please select the invalid arg behavior you want for the 'ctype'
  1107. functions.
  1108. The 'ctype' functions are now implemented using table lookups, with
  1109. the arg being the index. This can result in incorrect memory accesses
  1110. or even segfaults for args outside of the allowed range.
  1111. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1112. the macro implementations.
  1113. config UCLIBC_HAS_CTYPE_UNSAFE
  1114. bool "Do not check -- unsafe"
  1115. config UCLIBC_HAS_CTYPE_CHECKED
  1116. bool "Detect and handle appropriately"
  1117. config UCLIBC_HAS_CTYPE_ENFORCED
  1118. bool "Issue a diagnostic and abort()"
  1119. endchoice
  1120. config UCLIBC_HAS_WCHAR
  1121. bool "Wide Character Support"
  1122. default n
  1123. help
  1124. Answer Y to enable wide character support. This will make uClibc
  1125. much larger. It is also currently required for locale support.
  1126. Most people will answer N.
  1127. config UCLIBC_HAS_LOCALE
  1128. bool "Locale Support"
  1129. select UCLIBC_HAS_WCHAR
  1130. select UCLIBC_HAS_CTYPE_TABLES
  1131. default n
  1132. help
  1133. uClibc now has full ANSI/ISO C99 locale support (except for
  1134. wcsftime() and collating items in regex). Be aware that enabling
  1135. this option will make uClibc much larger.
  1136. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1137. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1138. uClibc by around 300k. You can reduce this size by building your own
  1139. custom set of locate data (see extra/locale/LOCALES for details).
  1140. uClibc's locale support is still under development. For example,
  1141. codesets using shift states are not currently supported. Support is
  1142. planned in the next iteration of locale support.
  1143. Answer Y to enable locale support. Most people will answer N.
  1144. choice
  1145. prompt "Locale data"
  1146. depends on UCLIBC_HAS_LOCALE
  1147. default UCLIBC_BUILD_ALL_LOCALE
  1148. config UCLIBC_BUILD_ALL_LOCALE
  1149. bool "All locales"
  1150. depends on UCLIBC_HAS_LOCALE
  1151. help
  1152. This builds all the locales that are available on your
  1153. host-box.
  1154. config UCLIBC_BUILD_MINIMAL_LOCALE
  1155. bool "Only selected locales"
  1156. depends on UCLIBC_HAS_LOCALE
  1157. help
  1158. If you do not need all locales that are available on your
  1159. host-box, then set this to 'Y'.
  1160. config UCLIBC_PREGENERATED_LOCALE_DATA
  1161. bool "Use Pre-generated Locale Data"
  1162. depends on UCLIBC_HAS_LOCALE
  1163. help
  1164. Use pre-built locale data.
  1165. Note that these pregenerated locales are sensitive to your
  1166. target architecture (endianess, bitcount).
  1167. Saying N here is highly recommended.
  1168. endchoice
  1169. config UCLIBC_BUILD_MINIMAL_LOCALES
  1170. string "locales to use"
  1171. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1172. default "en_US"
  1173. help
  1174. Space separated list of locales to use.
  1175. E.g.:
  1176. en_US en_GB de_AT
  1177. default:
  1178. en_US
  1179. config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
  1180. bool "Automagically Download the Pre-generated Locale Data (if necessary)"
  1181. depends on UCLIBC_PREGENERATED_LOCALE_DATA
  1182. default n
  1183. help
  1184. If you would like the build process to use 'wget' to automatically
  1185. download the pregenerated locale data, enable this option. Otherwise
  1186. you will need to obtain the locale data yourself from:
  1187. http://www.uclibc.org/downloads/uClibc-locale-*.tgz
  1188. and place the uClibc-locale-*.tgz tarball in the extra/locale/
  1189. directory.
  1190. Note that the use of pregenerated locale data is discouraged.
  1191. config UCLIBC_HAS_XLOCALE
  1192. bool "Extended Locale Support (experimental/incomplete)"
  1193. depends on UCLIBC_HAS_LOCALE
  1194. default n
  1195. help
  1196. Answer Y to enable extended locale support similar to that provided
  1197. by glibc. This is primarily intended to support libstd++
  1198. functionality.
  1199. However, it also allows thread-specific locale selection via
  1200. uselocale().
  1201. Most people will answer N.
  1202. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1203. bool "Support hexadecimal float notation"
  1204. depends on UCLIBC_HAS_CTYPE_TABLES
  1205. depends on UCLIBC_HAS_FLOATS
  1206. default n
  1207. help
  1208. Answer Y to enable support for hexadecimal float notation in the
  1209. (wchar and) char string to floating point conversion functions, as
  1210. well as support for the %a and %A conversion specifiers in the
  1211. *printf() and *scanf() functions.
  1212. Most people will answer N.
  1213. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1214. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1215. depends on UCLIBC_HAS_LOCALE
  1216. depends on UCLIBC_HAS_FLOATS
  1217. default n
  1218. help
  1219. Answer Y to enable support for glibc's \"'\" flag for allowing
  1220. locale-specific digit grouping in base 10 integer conversions and
  1221. appropriate floating point conversions in the *printf() and *scanf()
  1222. functions.
  1223. Most people will answer N.
  1224. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1225. bool "Do not require digit grouping when the \"'\" flag is specified"
  1226. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1227. default y
  1228. help
  1229. Answer Y to make digit grouping optional when the \"'\" flag is
  1230. specified.
  1231. This is the standard glibc behavior. If the initial string of digits
  1232. exceeds the maximum group number, the input will be treated as a
  1233. normal non-grouped number.
  1234. Most people will answer N.
  1235. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1236. bool "Support glibc's register_printf_function() (glibc-compat)"
  1237. depends on !USE_OLD_VFPRINTF
  1238. default n
  1239. help
  1240. Answer Y to support glibc's register_printf_function() to allow an
  1241. application to add its own printf conversion specifiers.
  1242. parse_printf_format() is also enabled.
  1243. NOTE: Limits the number or registered specifiers to 10.
  1244. NOTE: Requires new conversion specifiers to be ASCII
  1245. characters (0-0x7f). This is to avoid problems with processing
  1246. format strings in locales with different multibyte conversions.
  1247. Most people will answer N.
  1248. config USE_OLD_VFPRINTF
  1249. bool "Use the old vfprintf implementation"
  1250. depends on !UCLIBC_HAS_WCHAR
  1251. default n
  1252. help
  1253. Set to true to use the old vfprintf instead of the new. This is
  1254. roughly C89 compliant with some extensions, and is much smaller.
  1255. However, it does not support wide chars, positional args, or glibc
  1256. custom printf specifiers.
  1257. Most people will answer N.
  1258. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1259. int "Maximum number of positional args. Either 0 or >= 9."
  1260. depends on !USE_OLD_VFPRINTF
  1261. default 9
  1262. help
  1263. Set the maximum number of positional args supported by the
  1264. printf/scanf functions. The Single Unix Specification Version 3
  1265. requires a minimum value of 9. Setting this to a value lower than
  1266. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1267. in limits.h to be #undef'd.
  1268. WARNING! The workspace to support positional args is currently
  1269. allocated on the stack. You probably don't want to set
  1270. this to too high a value.
  1271. Most people will answer 9.
  1272. config UCLIBC_HAS_SCANF_GLIBC_A_FLAG
  1273. bool "Support glibc's 'a' flag for scanf string conversions (not implemented)"
  1274. default n
  1275. help
  1276. NOTE!!! Currently Not Implemented!!! Just A Place Holder!! NOTE!!!
  1277. NOTE!!! Conflicts with an ANSI/ISO C99 scanf flag!! NOTE!!!
  1278. Answer Y to enable support for glibc's 'a' flag for the scanf string
  1279. conversions '%s', '%[', '%ls', '%l[', and '%S'. This is used to
  1280. auto-allocate sufficient memory to hold the data retrieved.
  1281. Most people will answer N.
  1282. choice
  1283. prompt "Stdio buffer size"
  1284. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1285. help
  1286. Please select a value for BUFSIZ. This will be used by the
  1287. stdio subsystem as the default buffer size for a file, and
  1288. affects fopen(), setvbuf(), etc.
  1289. NOTE: Setting this to 'none' will disable buffering completely.
  1290. However, BUFSIZ will still be defined in stdio.h as 256 because
  1291. many applications use this value.
  1292. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1293. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1294. depends on !UCLIBC_HAS_WCHAR
  1295. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1296. bool "256 (minimum ANSI/ISO C99 value)"
  1297. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1298. bool "512"
  1299. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1300. bool "1024"
  1301. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1302. bool "2048"
  1303. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1304. bool "4096"
  1305. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1306. bool "8192"
  1307. # If you add more choices, you will need to update uClibc_stdio.h.
  1308. endchoice
  1309. choice
  1310. prompt "Stdio builtin buffer size (uClibc-specific)"
  1311. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1312. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1313. help
  1314. When a FILE is created with fopen(), an attempt is made to allocate
  1315. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1316. succeed but the FILE will be unbuffered.
  1317. This option adds a small amount of space to each FILE to act as an
  1318. emergency buffer in the event of a buffer allocation failure.
  1319. Most people will answer None.
  1320. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1321. bool "None"
  1322. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1323. bool "4"
  1324. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1325. bool "8"
  1326. # If you add more choices, you will need to update uClibc_stdio.h.
  1327. endchoice
  1328. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1329. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1330. default n
  1331. help
  1332. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1333. a behavioral change made in SUSv3. Previously, abort() was required
  1334. to have the affect of fclose() on all open streams. The wording has
  1335. been changed to "may" from "shall".
  1336. Most people will answer N.
  1337. config UCLIBC_HAS_STDIO_GETC_MACRO
  1338. bool "Provide a macro version of getc()"
  1339. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1340. default y
  1341. help
  1342. Provide a macro version of getc().
  1343. Most people will answer Y.
  1344. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1345. bool "Provide a macro version of putc()"
  1346. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1347. default y
  1348. help
  1349. Provide a macro version of putc().
  1350. Most people will answer Y.
  1351. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1352. bool "Support auto-r/w transition"
  1353. default y
  1354. help
  1355. Answer Y to enable the stdio subsystem to automaticly transition
  1356. between reading and writing. This relaxes the ANSI/ISO C99
  1357. requirement:
  1358. When a file is opened with update mode ('+' as the second or third
  1359. character in the list of mode argument values), both input and output
  1360. may be performed on the associated stream. However, output shall not
  1361. be directly followed by input without an intervening call to the
  1362. fflush function or to a file positioning function (fseek, fsetpos,
  1363. or rewind), and input shall not be directly followed by output without
  1364. an intervening call to a file positioning function, unless the input
  1365. operation encounters end­of­file.
  1366. Most people will answer Y.
  1367. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1368. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1369. depends on UCLIBC_HAS_LFS
  1370. default n
  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. default n
  1379. help
  1380. Answer Y to support a glibc extension to allow passing
  1381. additional 'x' flag in the mode string for fopen() to specify that
  1382. the file should be open()ed with the O_EXCL flag set.
  1383. Most people will answer N.
  1384. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1385. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1386. default n
  1387. help
  1388. Answer Y to support the glibc 'custom stream' extension functions
  1389. fmemopen(), open_memstream(), and fopencookie().
  1390. NOTE: There are some minor differences regarding seeking behavior.
  1391. Most people will answer N.
  1392. config UCLIBC_HAS_PRINTF_M_SPEC
  1393. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1394. default n
  1395. help
  1396. Answer Y to support a glibc extension to interpret '%m' in printf
  1397. format strings as an instruction to output the error message string
  1398. (as generated by strerror) corresponding to the current value of
  1399. 'errno'.
  1400. Most people will answer N.
  1401. config UCLIBC_HAS_ERRNO_MESSAGES
  1402. bool "Include the errno message text in the library"
  1403. default y
  1404. help
  1405. Answer Y if you want to include the errno message text in the
  1406. library. This adds about 3K to the library, but enables strerror()
  1407. to generate text other than 'Unknown error <number>'.
  1408. Most people will answer Y.
  1409. config UCLIBC_HAS_SYS_ERRLIST
  1410. bool "Support sys_errlist[] (obsolete-compat)"
  1411. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1412. default n
  1413. help
  1414. Answer Y if you want to support the obsolete sys_errlist[].
  1415. This adds about 0.5k to the library, except for the mips
  1416. arch where it adds over 4K.
  1417. WARNING! In the future, support for sys_errlist[] may be unavailable
  1418. in at least some configurations. In fact, it may be removed
  1419. altogether.
  1420. Most people will answer N.
  1421. Application writers: use the strerror(3) function.
  1422. config UCLIBC_HAS_SIGNUM_MESSAGES
  1423. bool "Include the signum message text in the library"
  1424. default y
  1425. help
  1426. Answer Y if you want to include the signum message text in the
  1427. library. This adds about 0.5K to the library, but enables strsignal()
  1428. to generate text other than 'Unknown signal <number>'.
  1429. Most people will answer Y.
  1430. config UCLIBC_HAS_SYS_SIGLIST
  1431. bool "Support sys_siglist[] (bsd-compat)"
  1432. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1433. default n
  1434. help
  1435. Answer Y if you want to support sys_siglist[].
  1436. WARNING! In the future, support for sys_siglist[] may be unavailable
  1437. in at least some configurations. In fact, it may be removed
  1438. altogether.
  1439. Most people will answer N.
  1440. config UCLIBC_HAS_GETTEXT_AWARENESS
  1441. bool "Include gettext awareness"
  1442. depends on UCLIBC_HAS_LOCALE && UCLIBC_MJN3_ONLY
  1443. default n
  1444. help
  1445. NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
  1446. Answer Y if you want to include weak stub gettext support and
  1447. make the *strerror*() and strsignal() functions gettext-aware.
  1448. Currently, to get functional gettext functionality you will need
  1449. to use gnu gettext.
  1450. Most people will answer N.
  1451. config UCLIBC_HAS_GNU_GETOPT
  1452. bool "Support gnu getopt"
  1453. default y
  1454. help
  1455. Answer Y if you want to include full gnu getopt() instead of a
  1456. (much smaller) SUSv3 compatible getopt().
  1457. Most people will answer Y.
  1458. config UCLIBC_HAS_STDIO_FUTEXES
  1459. bool "Use futexes for multithreaded I/O locking"
  1460. default n
  1461. depends on UCLIBC_HAS_THREADS_NATIVE
  1462. help
  1463. If you want to compile uClibc to use futexes for low-level
  1464. I/O locking, answer Y. Otherwise, answer N.
  1465. config UCLIBC_HAS_GETOPT_LONG
  1466. bool "Support getopt_long/getopt_long_only"
  1467. depends on !UCLIBC_HAS_GNU_GETOPT
  1468. default y
  1469. help
  1470. Answer Y if you want to include getopt_long[_only() used by many
  1471. apps, even busybox.
  1472. Most people will answer Y.
  1473. config UCLIBC_HAS_GNU_GETSUBOPT
  1474. bool "Support glibc getsubopt"
  1475. default y
  1476. help
  1477. Answer Y if you want to include glibc getsubopt() instead of a
  1478. smaller SUSv3 compatible getsubopt().
  1479. Most people will answer Y.
  1480. endmenu
  1481. menu "Big and Tall"
  1482. config UCLIBC_HAS_REGEX
  1483. bool "Regular Expression Support"
  1484. default y
  1485. help
  1486. POSIX regular expression code is really big -- 53k all by itself.
  1487. If you don't use regular expressions, turn this off and save space.
  1488. Of course, if you only statically link, leave this on, since it will
  1489. only be included in your apps if you use regular expressions.
  1490. config UCLIBC_HAS_REGEX_OLD
  1491. bool "Use the older (stable) regular expression code"
  1492. depends on UCLIBC_HAS_REGEX
  1493. default y
  1494. help
  1495. There are two versions of regex. The older (stable) version has
  1496. been in uClibc for quite a long time but hasn't seen too many
  1497. updates. It also has some known issues when dealing with uncommon
  1498. corner cases and multibyte/unicode strings. However, it is quite
  1499. a bit smaller than the newer version.
  1500. If the older version has worked for you and you don't need unicode
  1501. support, then stick with the old version (and say Y here).
  1502. Otherwise, you should use the new version (and say N here).
  1503. config UCLIBC_HAS_FNMATCH
  1504. bool "fnmatch Support"
  1505. default y
  1506. help
  1507. POSIX fnmatch.
  1508. config UCLIBC_HAS_FNMATCH_OLD
  1509. bool "Use the older (stable) fnmatch code"
  1510. depends on UCLIBC_HAS_FNMATCH
  1511. default y
  1512. help
  1513. There are two versions of fnmatch. The older (stable) version has
  1514. been in uClibc for quite a long time but hasn't seen too many
  1515. updates. It also has some known issues when dealing with uncommon
  1516. corner cases and multibyte/unicode strings. However, it is quite
  1517. a bit smaller than the newer version.
  1518. If the older version has worked for you and you don't need unicode
  1519. support, then stick with the old version (and say Y here).
  1520. Otherwise, you should use the new version (and say N here).
  1521. config UCLIBC_HAS_WORDEXP
  1522. bool "Support the wordexp() interface"
  1523. depends on UCLIBC_HAS_GLOB
  1524. default n
  1525. help
  1526. The SuSv3 wordexp() interface performs word expansions per the Shell
  1527. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1528. intended for use by applications that want to implement all of the
  1529. standard Bourne shell expansions on input data.
  1530. This interface is rarely used, and very large. Unless you have a
  1531. pressing need for wordexp(), you should probably answer N.
  1532. config UCLIBC_HAS_NFTW
  1533. bool "Support the nftw() interface"
  1534. default n
  1535. help
  1536. The SuSv3 nftw() interface is used to recursively descend
  1537. directory paths while repeatedly calling a function.
  1538. This interface is rarely used, and adds around 4.5k. Unless you have
  1539. a pressing need for nftw(), you should probably answer N.
  1540. config UCLIBC_HAS_FTW
  1541. bool "Support the ftw() interface"
  1542. default n
  1543. depends on UCLIBC_SUSV4_LEGACY
  1544. help
  1545. The SuSv3 ftw() interface is used to recursively descend
  1546. directory paths while repeatedly calling a function.
  1547. This interface is rarely used, and adds around 4.5k. Unless you have
  1548. a pressing need for ftw(), you should probably answer N.
  1549. config UCLIBC_HAS_GLOB
  1550. bool "Support the glob() interface"
  1551. depends on UCLIBC_HAS_FNMATCH
  1552. default y
  1553. help
  1554. The glob interface is somewhat large (weighing in at about 2,5k). It
  1555. is used fairly often, but is an option since people wanting to go for
  1556. absolute minimum size may wish to omit it.
  1557. Most people will answer Y.
  1558. config UCLIBC_HAS_GNU_GLOB
  1559. bool "Support gnu glob() interface"
  1560. depends on UCLIBC_HAS_GLOB
  1561. default n
  1562. help
  1563. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1564. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1565. from glibc and does not support all the GNU specific options.
  1566. Answer Y if you want to include full gnu glob() instead of the smaller
  1567. SUSv3 compatible glob().
  1568. Most people will answer N.
  1569. config UCLIBC_HAS_UTMPX
  1570. bool "utmpx based support for tracking login/logouts to/from the system"
  1571. default n
  1572. help
  1573. Answer y to enable support for accessing user accounting database.
  1574. It can be used to track all login/logout to the system.
  1575. If unsure, just answer N.
  1576. endmenu
  1577. menu "Library Installation Options"
  1578. config RUNTIME_PREFIX
  1579. string "uClibc runtime library directory"
  1580. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1581. help
  1582. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1583. libraries will be installed. The result will look something
  1584. like the following:
  1585. $(RUNTIME_PREFIX)/
  1586. lib/ <contains all runtime libraries>
  1587. usr/bin/ldd <the ldd utility program>
  1588. sbin/ldconfig <the ldconfig utility program>
  1589. This value is used by the 'make install' Makefile target. Since this
  1590. directory is compiled into the shared library loader, you will need to
  1591. recompile uClibc if you change this value...
  1592. For a typical target system this should be set to "/", such that
  1593. 'make install' will install /lib/libuClibc-<VERSION>.so
  1594. config DEVEL_PREFIX
  1595. string "uClibc development environment directory"
  1596. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1597. help
  1598. DEVEL_PREFIX is the directory into which the uClibc development
  1599. environment will be installed. The result will look something
  1600. like the following:
  1601. $(DEVEL_PREFIX)/
  1602. lib/ <contains static libs>
  1603. include/ <Where all the header files go>
  1604. This value is used by the 'make install' Makefile target when
  1605. installing a uClibc development environment.
  1606. For a typical target system this should be set to "/usr", such that
  1607. 'make install' will install /usr/include/<header files>.
  1608. config MULTILIB_DIR
  1609. string "library path component"
  1610. default "lib"
  1611. help
  1612. Path component where libraries reside.
  1613. For a typical target system this should be set to "lib", such that
  1614. 'make install' will install libraries to "/lib" and "/usr/lib"
  1615. respectively
  1616. DEVEL_PREFIX/MULTILIB_DIR
  1617. RUNTIME_PREFIX/MULTILIB_DIR
  1618. Other settings may include "lib32" or "lib64".
  1619. config HARDWIRED_ABSPATH
  1620. bool "Hardwire absolute paths into linker scripts"
  1621. default y
  1622. help
  1623. This prepends absolute paths to the libraries mentioned in linker
  1624. scripts such as libc.so.
  1625. This is a build time optimization. It has no impact on dynamic
  1626. linking at runtime, which doesn't use linker scripts.
  1627. You must disable this to use uClibc with old non-sysroot toolchains,
  1628. such as the prebuilt binary cross compilers at:
  1629. http://uclibc.org/downloads/binaries
  1630. The amount of time saved by this optimization is actually too small to
  1631. measure. The linker just had to search the library path to find the
  1632. linker script, so the dentries are cache hot if it has to search the
  1633. same path again. But it's what glibc does, so we do it too.
  1634. endmenu
  1635. menu "Security options"
  1636. config UCLIBC_BUILD_PIE
  1637. bool "Build utilities as ET_DYN/PIE executables"
  1638. depends on HAVE_SHARED
  1639. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
  1640. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1641. default n
  1642. help
  1643. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1644. executables.
  1645. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1646. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1647. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1648. all libraries have to be built with -fPIC or -fpic, and all
  1649. assembler functions must be written as position independent
  1650. code (PIC).
  1651. config UCLIBC_HAS_ARC4RANDOM
  1652. bool "Include the arc4random() function"
  1653. default n
  1654. help
  1655. Answer Y to support the OpenBSD-like arc4random() function. This
  1656. function picks a random number between 0 and N, and will always return
  1657. something even if the random driver is dead. If urandom fails then
  1658. gettimeofday(2) will be used as the random seed. This function is
  1659. designed to be more dependable than invoking /dev/urandom directly.
  1660. OpenSSL and OpenNTPD currently support this function.
  1661. Most people will answer N.
  1662. config HAVE_NO_SSP
  1663. bool
  1664. default n
  1665. config UCLIBC_HAS_SSP
  1666. bool "Support for GCC stack smashing protector"
  1667. depends on !HAVE_NO_SSP
  1668. default n
  1669. help
  1670. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1671. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1672. the needed functions are added to ldso/libc instead.
  1673. GCC's stack protector is a reimplementation of IBM's propolice.
  1674. See http://www.trl.ibm.com/projects/security/ssp/ and
  1675. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1676. for details.
  1677. Note that NOEXECSTACK on a kernel with address space randomization
  1678. is generally sufficient to prevent most buffer overflow exploits
  1679. without increasing code size. This option essentially adds debugging
  1680. code to catch them.
  1681. Most people will answer N.
  1682. config UCLIBC_HAS_SSP_COMPAT
  1683. bool "Support for gcc-3.x propolice smashing stack protector"
  1684. depends on UCLIBC_HAS_SSP
  1685. default n
  1686. help
  1687. Add gcc-3.x propolice smashing stack protector to the library.
  1688. This requires a patched version of GCC, supporting the
  1689. -fstack-protector[-all] options, with the __guard and
  1690. __stack_smash_handler functions removed from libgcc.
  1691. These functions are added to ldso/libc instead.
  1692. More information at:
  1693. <http://www.research.ibm.com/trl/projects/security/ssp/>
  1694. Most people will answer N.
  1695. config SSP_QUICK_CANARY
  1696. bool "Use simple guard values without accessing /dev/urandom"
  1697. depends on UCLIBC_HAS_SSP
  1698. default n
  1699. help
  1700. Use gettimeofday(2) to define the __guard without accessing
  1701. /dev/urandom.
  1702. WARNING: This makes smashing stack protector vulnerable to timing
  1703. attacks.
  1704. Most people will answer N.
  1705. choice
  1706. prompt "Propolice protection blocking signal"
  1707. depends on UCLIBC_HAS_SSP
  1708. default PROPOLICE_BLOCK_ABRT if ! DODEBUG
  1709. default PROPOLICE_BLOCK_SEGV if DODEBUG
  1710. help
  1711. "abort" use SIGABRT to block offending programs.
  1712. This is the default implementation.
  1713. "segfault" use SIGSEGV to block offending programs.
  1714. Use this for debugging.
  1715. If unsure, answer "abort".
  1716. config PROPOLICE_BLOCK_ABRT
  1717. bool "abort"
  1718. config PROPOLICE_BLOCK_SEGV
  1719. bool "segfault"
  1720. endchoice
  1721. config UCLIBC_BUILD_SSP
  1722. bool "Build uClibc with -fstack-protector"
  1723. depends on UCLIBC_HAS_SSP
  1724. default n
  1725. help
  1726. Build all uClibc libraries and executables with -fstack-protector,
  1727. adding extra stack overflow checking to most uClibc functions.
  1728. config UCLIBC_BUILD_RELRO
  1729. bool "Build uClibc with linker option -z RELRO"
  1730. depends on HAVE_SHARED
  1731. default y
  1732. help
  1733. Build all libraries and executables with "ld -z relro".
  1734. This tells the linker to mark chunks of an executable or shared
  1735. library read-only after applying dynamic relocations. (This comes
  1736. up when a global const variable is initialized to the address of a
  1737. function or the value of another global variable.)
  1738. This is a fairly obscure option the ld man page doesn't even bother
  1739. to document properly. It's a security paranoia issue that's more
  1740. likely to consume memory (by allocating an extra page) rather than
  1741. save it.
  1742. This is explained in more depth at
  1743. http://www.airs.com/blog/archives/189
  1744. Nobody is likely to care whether you say Y or N here.
  1745. config UCLIBC_BUILD_NOW
  1746. bool "Build uClibc with linker option -z NOW"
  1747. depends on HAVE_SHARED
  1748. default n
  1749. help
  1750. Build all libraries and executables with "ld -z now".
  1751. This tells the linker to resolve all symbols when the library is
  1752. first loaded, rather than when each function is first called. This
  1753. increases start-up latency by a few microseconds and may do
  1754. unnecessary work (resolving symbols that are never used), but the
  1755. realtime people like it for making microbenchmark timings slightly
  1756. more predictable and in some cases it can be slightly faster due to
  1757. CPU cache behavior (not having to fault the linker back in to do
  1758. lazy symbol resolution).
  1759. Most people can't tell the difference between selecting Y or N here.
  1760. config UCLIBC_BUILD_NOEXECSTACK
  1761. bool "Build uClibc with noexecstack marking"
  1762. default y
  1763. help
  1764. Mark all assembler files as noexecstack, which will mark uClibc
  1765. as not requiring an executable stack. (This doesn't prevent other
  1766. files you link against from claiming to need an executable stack, it
  1767. just won't cause uClibc to request it unnecessarily.)
  1768. This is a security thing to make buffer overflows harder to exploit.
  1769. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1770. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1771. It only actually provides any security when combined with address
  1772. space randomization, explained here: http://lwn.net/Articles/121845/
  1773. Address space randomization is on by default in current linux
  1774. kernels (although it can be disabled using the option
  1775. CONFIG_COMPAT_BRK).
  1776. You should probably say Y.
  1777. endmenu
  1778. menu "uClibc development/debugging options"
  1779. config CROSS_COMPILER_PREFIX
  1780. string "Cross-compiling toolchain prefix"
  1781. default ""
  1782. help
  1783. The prefix used to execute your cross-compiling toolchain. For
  1784. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1785. then enter 'arm-linux-uclibc-' here.
  1786. config UCLIBC_EXTRA_CFLAGS
  1787. string "Enter any extra CFLAGS to use to build uClibc"
  1788. default ""
  1789. help
  1790. Add any additional CFLAGS to be used to build uClibc.
  1791. config DODEBUG
  1792. bool "Build uClibc with debugging symbols"
  1793. default n
  1794. select EXTRA_WARNINGS
  1795. help
  1796. Say Y here if you wish to compile uClibc with debugging symbols.
  1797. This will allow you to use a debugger to examine uClibc internals
  1798. while applications are running. This increases the size of the
  1799. library considerably and should only be used when doing development.
  1800. If you are doing development and want to debug uClibc, answer Y.
  1801. Otherwise, answer N.
  1802. config DODEBUG_PT
  1803. bool "Build pthread with debugging output"
  1804. depends on UCLIBC_HAS_THREADS && LINUXTHREADS_OLD
  1805. default n
  1806. help
  1807. Enable debug output in libpthread. This is only useful when doing
  1808. development in libpthread itself.
  1809. Otherwise, answer N.
  1810. config DOSTRIP
  1811. bool "Strip libraries and executables"
  1812. default y
  1813. depends on !DODEBUG
  1814. help
  1815. Say Y here if you do wish to strip all uClibc libraries and
  1816. executables. No stripping increases the size of the binaries
  1817. considerably, but makes it possible to debug uClibc libraries.
  1818. Most people will answer Y.
  1819. config DOASSERTS
  1820. bool "Build uClibc with run-time assertion testing"
  1821. default n
  1822. help
  1823. Say Y here to include runtime assertion tests.
  1824. This enables runtime assertion testing in some code, which can
  1825. increase the size of the library and incur runtime overhead.
  1826. If you say N, then this testing will be disabled.
  1827. config SUPPORT_LD_DEBUG
  1828. bool "Build the shared library loader with debugging support"
  1829. depends on HAVE_SHARED
  1830. default n
  1831. help
  1832. Answer Y here to enable all the extra code needed to debug the uClibc
  1833. native shared library loader. The level of debugging noise that is
  1834. generated depends on the LD_DEBUG environment variable... Just set
  1835. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1836. debug your application. Diagnostic messages will then be printed to
  1837. the stderr.
  1838. For now these debugging tokens are available:
  1839. detail provide more information for some options
  1840. move display copy processing
  1841. symbols display symbol table processing
  1842. reloc display relocation processing; detail shows the
  1843. relocation patch
  1844. nofixups never fixes up jump relocations
  1845. bindings displays the resolve processing (function calls);
  1846. detail shows the relocation patch
  1847. all Enable everything!
  1848. The additional environment variable:
  1849. LD_DEBUG_OUTPUT=file
  1850. redirects the diagnostics to an output file created using
  1851. the specified name and the process id as a suffix.
  1852. An excellent start is simply:
  1853. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1854. or to log everything to a file named 'logfile', try this
  1855. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1856. If you are doing development and want to debug uClibc's shared library
  1857. loader, answer Y. Mere mortals answer N.
  1858. config SUPPORT_LD_DEBUG_EARLY
  1859. bool "Build the shared library loader with early debugging support"
  1860. depends on HAVE_SHARED
  1861. default n
  1862. help
  1863. Answer Y here to if you find the uClibc shared library loader is
  1864. crashing or otherwise not working very early on. This is typical
  1865. only when starting a new port when you haven't figured out how to
  1866. properly get the values for argc, argv, environ, etc. This method
  1867. allows a degree of visibility into the very early shared library
  1868. loader initialization process. If you are doing development and want
  1869. to debug the uClibc shared library loader early initialization,
  1870. answer Y. Mere mortals answer N.
  1871. config UCLIBC_MALLOC_DEBUGGING
  1872. bool "Build malloc with debugging support"
  1873. depends on MALLOC || MALLOC_STANDARD
  1874. default n
  1875. help
  1876. Answer Y here to compile extra debugging support code into malloc.
  1877. Malloc debugging output may then be enabled at runtime using the
  1878. MALLOC_DEBUG environment variable.
  1879. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1880. as a bitmask with the following bits:
  1881. 1 - do extra consistency checking
  1882. 2 - output messages for malloc/free calls and OS
  1883. allocation calls
  1884. 4 - output messages for the `MMB' layer
  1885. 8 - output messages for internal malloc heap manipulation
  1886. calls
  1887. Because this increases the size of malloc appreciably (due to strings
  1888. etc), you should say N unless you need to debug a malloc problem.
  1889. config UCLIBC_HAS_BACKTRACE
  1890. bool "Add support for application self-debugging"
  1891. depends on HAVE_SHARED && TARGET_sh
  1892. default n
  1893. help
  1894. Answer Y here to compile support for application self-debugging, by adding
  1895. a new shared object "libubacktrace.so" that provides the following new
  1896. functions:
  1897. backtrace, backtrace_symbols, backtrace_symbols_fd
  1898. The backtrace functionality is currently supported on SH platform, and it
  1899. based on dwarf2 informations to properly work, so any application that
  1900. want to use backtrace needs to be built with -fexceptions flag.
  1901. The symbol names may be unavailable without the use of special linker
  1902. options. For systems using the GNU linker, it is necessary to use the
  1903. -rdynamic linker option too. Note that names of "static" functions are not
  1904. exposed, and won't be available in the backtrace.
  1905. config WARNINGS
  1906. string "Compiler Warnings"
  1907. default "-Wall"
  1908. help
  1909. Set this to the set of gcc warnings you wish to see while compiling.
  1910. config EXTRA_WARNINGS
  1911. bool "Enable extra annoying warnings"
  1912. default n
  1913. help
  1914. If you wish to build with extra warnings enabled, say Y here.
  1915. config DOMULTI
  1916. bool "Compile all sources at once into an object"
  1917. default n
  1918. help
  1919. Set this to compile all sources at once into an object (IMA).
  1920. This mode of compilation uses alot of memory but may produce
  1921. smaller binaries.
  1922. Note that you need a very recent GCC for this to work, like
  1923. gcc >= 4.3 plus eventually some patches.
  1924. If unsure, keep the default of N.
  1925. config UCLIBC_MJN3_ONLY
  1926. bool "Manuel's hidden warnings"
  1927. default n
  1928. help
  1929. Answer Y here to see all Manuel's personal notes, warnings, and todos.
  1930. Most people will answer N.
  1931. endmenu