Config.in 71 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 (BROKEN)"
  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. endchoice
  89. menu "Target Architecture Features and Options"
  90. if TARGET_alpha
  91. source "extra/Configs/Config.alpha"
  92. endif
  93. if TARGET_arm
  94. source "extra/Configs/Config.arm"
  95. endif
  96. if TARGET_avr32
  97. source "extra/Configs/Config.avr32"
  98. endif
  99. if TARGET_bfin
  100. source "extra/Configs/Config.bfin"
  101. endif
  102. if TARGET_cris
  103. source "extra/Configs/Config.cris"
  104. endif
  105. if TARGET_e1
  106. source "extra/Configs/Config.e1"
  107. endif
  108. if TARGET_frv
  109. source "extra/Configs/Config.frv"
  110. endif
  111. if TARGET_h8300
  112. source "extra/Configs/Config.h8300"
  113. endif
  114. if TARGET_hppa
  115. source "extra/Configs/Config.hppa"
  116. endif
  117. if TARGET_i386
  118. source "extra/Configs/Config.i386"
  119. endif
  120. if TARGET_i960
  121. source "extra/Configs/Config.i960"
  122. endif
  123. if TARGET_ia64
  124. source "extra/Configs/Config.ia64"
  125. endif
  126. if TARGET_m68k
  127. source "extra/Configs/Config.m68k"
  128. endif
  129. if TARGET_nios
  130. source "extra/Configs/Config.nios"
  131. endif
  132. if TARGET_nios2
  133. source "extra/Configs/Config.nios2"
  134. endif
  135. if TARGET_microblaze
  136. source "extra/Configs/Config.microblaze"
  137. endif
  138. if TARGET_mips
  139. source "extra/Configs/Config.mips"
  140. endif
  141. if TARGET_powerpc
  142. source "extra/Configs/Config.powerpc"
  143. endif
  144. if TARGET_sh
  145. source "extra/Configs/Config.sh"
  146. endif
  147. if TARGET_sh64
  148. source "extra/Configs/Config.sh64"
  149. endif
  150. if TARGET_sparc
  151. source "extra/Configs/Config.sparc"
  152. endif
  153. if TARGET_v850
  154. source "extra/Configs/Config.v850"
  155. endif
  156. if TARGET_vax
  157. source "extra/Configs/Config.vax"
  158. endif
  159. if TARGET_x86_64
  160. source "extra/Configs/Config.x86_64"
  161. endif
  162. if TARGET_xtensa
  163. source "extra/Configs/Config.xtensa"
  164. endif
  165. config TARGET_SUBARCH
  166. string
  167. default "e500" if CONFIG_E500
  168. default "classic" if CONFIG_CLASSIC
  169. default "sh4" if CONFIG_SH4
  170. default "" if CONFIG_GENERIC_386 || CONFIG_386
  171. default "i486" if CONFIG_486
  172. default "i586" if CONFIG_586 || CONFIG_586MMX
  173. default "i686" if TARGET_ARCH = "i386"
  174. default ""
  175. source "extra/Configs/Config.in.arch"
  176. endmenu
  177. menu "General Library Settings"
  178. config HAVE_NO_PIC
  179. bool
  180. default n
  181. config DOPIC
  182. bool "Generate only Position Independent Code (PIC)"
  183. default y
  184. depends on !HAVE_NO_PIC
  185. help
  186. If you wish to build all of uClibc as PIC objects, then answer Y here.
  187. If you are unsure, then you should answer N.
  188. config ARCH_HAS_NO_SHARED
  189. bool
  190. default n
  191. config ARCH_HAS_NO_LDSO
  192. bool
  193. select ARCH_HAS_NO_SHARED
  194. default n
  195. config HAVE_SHARED
  196. bool "Enable shared libraries"
  197. depends on !ARCH_HAS_NO_SHARED
  198. default y
  199. help
  200. If you wish to build uClibc with support for shared libraries then
  201. answer Y here. If you only want to build uClibc as a static library,
  202. then answer N.
  203. config FORCE_SHAREABLE_TEXT_SEGMENTS
  204. bool "Only load shared libraries which can share their text segment"
  205. depends on HAVE_SHARED
  206. select DOPIC
  207. default n
  208. help
  209. If you answer Y here, the uClibc native shared library loader will
  210. only load shared libraries, which do not need to modify any
  211. non-writable segments. These libraries haven't set the DT_TEXTREL
  212. tag in the dynamic section (==> objdump).
  213. All your libraries must be compiled with -fPIC or -fpic, and all
  214. assembler function must be written as position independent code (PIC).
  215. Enabling this option will make uClibc's shared library loader a
  216. little bit smaller and guarantee that no memory will be wasted by
  217. badly coded shared libraries.
  218. config LDSO_LDD_SUPPORT
  219. bool "Native 'ldd' support"
  220. depends on HAVE_SHARED
  221. default y
  222. help
  223. Enable all the code needed to support traditional ldd,
  224. which executes the shared library loader to resolve all dependencies
  225. and then provide a list of shared libraries that are required for an
  226. application to function. Disabling this option will make uClibc's
  227. shared library loader a little bit smaller.
  228. Most people will answer Y.
  229. config LDSO_CACHE_SUPPORT
  230. bool "Enable library loader cache (ld.so.conf)"
  231. depends on HAVE_SHARED
  232. default y
  233. help
  234. Enable this to make use of /etc/ld.so.conf, the shared library loader
  235. cache configuration file to support for non-standard library paths.
  236. After updating this file, it is necessary to run 'ldconfig' to update
  237. the /etc/ld.so.cache shared library loader cache file.
  238. config LDSO_PRELOAD_ENV_SUPPORT
  239. bool "Enable library loader LD_PRELOAD environment"
  240. depends on HAVE_SHARED
  241. default y
  242. help
  243. Enable this to make use of LD_PRELOAD environment variable.
  244. A whitespace-separated list of additional, user-specified, ELF shared
  245. libraries to be loaded before all others. This can be used to
  246. selectively override functions in other shared libraries. For
  247. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  248. search directories that are also set-user-ID will be loaded.
  249. config LDSO_PRELOAD_FILE_SUPPORT
  250. bool "Enable library loader preload file (ld.so.preload)"
  251. depends on HAVE_SHARED
  252. default n
  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 UCLIBC_STATIC_LDCONFIG
  272. bool "Link ldconfig statically"
  273. depends on HAVE_SHARED
  274. default y
  275. help
  276. Enable this option to statically link the ldconfig binary.
  277. Making ldconfig static can be beneficial if you have a library
  278. problem and need to use ldconfig to recover. Sometimes it is
  279. preferable to instead keep the size of the system down, in which
  280. case you should disable this option.
  281. config LDSO_RUNPATH
  282. bool "Enable ELF RUNPATH tag support"
  283. depends on HAVE_SHARED
  284. default y if LDSO_CACHE_SUPPORT
  285. default n if !LDSO_CACHE_SUPPORT
  286. help
  287. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  288. which extend the library search paths. They are really only useful
  289. if a package installs libraries in non standard locations and
  290. ld.so.conf support is disabled.
  291. Usage of RUNPATH tags is not too common, so disabling this feature
  292. should be safe for most people.
  293. config LDSO_SEARCH_INTERP_PATH
  294. bool "Add ldso path to lib search path"
  295. depends on HAVE_SHARED
  296. default y
  297. help
  298. The ldso is told where it is being executed from and can use that
  299. path to find related core libraries. This is useful by default,
  300. but can be annoying in a mixed development environment.
  301. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  302. library search with /foo/boo/
  303. If unsure, simply say Y here.
  304. config UCLIBC_CTOR_DTOR
  305. bool "Support global constructors and destructors"
  306. default y
  307. help
  308. If you wish to build uClibc with support for global constructor
  309. (ctor) and global destructor (dtor) support, then answer Y here.
  310. When ctor/dtor support is enabled, binaries linked with uClibc must
  311. also be linked with crtbegin.o and crtend.o which are provided by gcc
  312. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  313. may need to be adjusted to include these files). This support will
  314. also add a small amount of additional size to each binary compiled vs
  315. uClibc. If you will be using uClibc with C++, or if you need the gcc
  316. __attribute__((constructor)) and __attribute__((destructor)) to work,
  317. then you definitely want to answer Y here. If you don't need ctors
  318. or dtors and want your binaries to be as small as possible, then
  319. answer N.
  320. config LDSO_GNU_HASH_SUPPORT
  321. bool "Enable GNU hash style support"
  322. depends on HAVE_SHARED
  323. default n
  324. help
  325. Newest binutils support a new hash style named GNU-hash. The dynamic
  326. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  327. if present into the ELF binaries, otherwise it will use the old SysV
  328. hash style (.hash). This ensures that it is completely backward
  329. compatible.
  330. Further, being the hash table implementation self-contained into each
  331. executable and shared libraries, objects with mixed hash style can
  332. peacefully coexist in the same process.
  333. If you want to use this new feature, answer Y
  334. choice
  335. prompt "Thread support"
  336. #default UCLIBC_HAS_THREADS_NATIVE if (TARGET_alpha || TARGET_arm || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_sh || TARGET_sh64)
  337. default HAS_NO_THREADS
  338. help
  339. If you want to compile uClibc with pthread support, then answer Y.
  340. This will increase the size of uClibc by adding a bunch of locking
  341. to critical data structures, and adding extra code to ensure that
  342. functions are properly reentrant.
  343. config HAS_NO_THREADS
  344. bool "none"
  345. help
  346. Disable thread support.
  347. config LINUXTHREADS_OLD
  348. bool "older (stable) version of linuxthreads"
  349. # linuxthreads and linuxthreads.old need nanosleep()
  350. select UCLIBC_HAS_REALTIME
  351. help
  352. There are two versions of linuxthreads. The older (stable) version
  353. has been in uClibc for quite a long time but hasn't seen too many
  354. updates other than bugfixes.
  355. config LINUXTHREADS_NEW
  356. bool "slightly newer version of linuxthreads"
  357. help
  358. The new version has not been tested much, and lacks ports for arches
  359. which glibc does not support (like bfin/frv/etc...), but is based on
  360. the latest code from glibc, so it may be the only choice for the
  361. newer ports (like alpha/amd64/64bit arches and hppa).
  362. config UCLIBC_HAS_THREADS_NATIVE
  363. bool "Native POSIX Threading (NPTL)"
  364. select UCLIBC_HAS_TLS
  365. select UCLIBC_HAS_STDIO_FUTEXES
  366. # NPTL local:
  367. select EXTRA_WARNINGS
  368. help
  369. If you want to compile uClibc with NPTL support, then answer Y.
  370. IMPORTANT NOTE! NPTL requires a Linux 2.6 kernel, binutils
  371. at least version 2.16 and GCC with at least version 4.1.0. NPTL
  372. will not work with older versions of any above sources. If you
  373. ignore any of these guidelines, you do so at your own risk. Do
  374. not ask for help on any of the development mailing lists.
  375. !!!! WARNING !!!! BIG FAT WARNING !!!! REALLY BIG FAT WARNING !!!!
  376. This is experimental code and at times it may not even build and
  377. even if it does it might decide to do random damage. This code is
  378. potentially hazardous to your health and sanity. It will remain
  379. that way until further notice at which point this notice will
  380. disappear. Thank you for your support and for not smoking.
  381. endchoice
  382. config UCLIBC_HAS_THREADS
  383. def_bool y if !HAS_NO_THREADS
  384. config UCLIBC_HAS_TLS
  385. bool "Thread-Local Storage"
  386. depends on UCLIBC_HAS_THREADS_NATIVE
  387. default n
  388. help
  389. If you want to enable TLS support then answer Y.
  390. This is fast an efficient way to store per-thread local data
  391. which is not on stack. It needs __thread support enabled in
  392. gcc.
  393. config PTHREADS_DEBUG_SUPPORT
  394. bool "Build pthreads debugging support"
  395. default n
  396. depends on UCLIBC_HAS_THREADS
  397. help
  398. Say Y here if you wish to be able to debug applications that use
  399. uClibc's pthreads library. By enabling this option, a library
  400. named libthread_db will be built. This library will be dlopen()'d
  401. by gdb and will allow gdb to debug the threads in your application.
  402. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  403. you must compile gdb with uClibc in order for pthread debugging to
  404. work properly.
  405. If you are doing development and want to debug applications using
  406. uClibc's pthread library, answer Y. Otherwise, answer N.
  407. config UCLIBC_HAS_SYSLOG
  408. bool "Syslog support"
  409. default y
  410. depends on UCLIBC_HAS_NETWORK_SUPPORT
  411. select UCLIBC_HAS_SOCKET
  412. help
  413. Support sending messages to the system logger.
  414. This requires socket-support.
  415. config UCLIBC_HAS_LFS
  416. bool "Large File Support"
  417. default y
  418. help
  419. If you wish to build uClibc with support for accessing large files
  420. (i.e. files greater then 2 GiB) then answer Y. Do not enable this
  421. if you are using an older Linux kernel (2.0.x) that lacks large file
  422. support. Enabling this option will increase the size of uClibc.
  423. choice
  424. prompt "Malloc Implementation"
  425. default MALLOC if ! ARCH_USE_MMU
  426. default MALLOC_STANDARD if ARCH_USE_MMU
  427. config MALLOC
  428. bool "malloc"
  429. help
  430. "malloc" use mmap for all allocations and so works very well on
  431. MMU-less systems that do not support the brk() system call. It is
  432. pretty smart about reusing already allocated memory, and minimizing
  433. memory wastage.
  434. This is the default for uClinux MMU-less systems.
  435. config MALLOC_SIMPLE
  436. bool "malloc-simple"
  437. help
  438. "malloc-simple" is trivially simple and slow as molasses. It
  439. was written from scratch for uClibc, and is the simplest possible
  440. (and therefore smallest) malloc implementation.
  441. This uses only the mmap() system call to allocate and free memory,
  442. and does not use the brk() system call at all, making it a fine
  443. choice for MMU-less systems with very limited memory. It's 100%
  444. standards compliant, thread safe, very small, and releases freed
  445. memory back to the OS immediately rather than keeping it in the
  446. process's heap for reallocation. It is also VERY SLOW.
  447. config MALLOC_STANDARD
  448. bool "malloc-standard"
  449. depends on ARCH_USE_MMU
  450. help
  451. "malloc-standard" is derived from the public domain dlmalloc
  452. implementation by Doug Lea. It is quite fast, and is pretty smart
  453. about reusing already allocated memory, and minimizing memory
  454. wastage. This uses brk() for small allocations, while using mmap()
  455. for larger allocations. This is the default malloc implementation
  456. for uClibc.
  457. If unsure, answer "malloc-standard".
  458. endchoice
  459. config MALLOC_GLIBC_COMPAT
  460. bool "Malloc returns live pointer for malloc(0)"
  461. default n
  462. help
  463. The behavior of malloc(0) is listed as implementation-defined by
  464. SuSv3. Glibc returns a valid pointer to something, while uClibc
  465. normally returns NULL. I personally feel glibc's behavior is
  466. not particularly safe, and allows buggy applications to hide very
  467. serious problems.
  468. When this option is enabled, uClibc will act just like glibc, and
  469. return a live pointer when someone calls malloc(0). This pointer
  470. provides a malloc'ed area with a size of 1 byte. This feature is
  471. mostly useful when dealing with applications using autoconf's broken
  472. AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
  473. does not detect glibc style returning-a-valid-pointer-for-malloc(0)
  474. behavior). Most people can safely answer N.
  475. config UCLIBC_DYNAMIC_ATEXIT
  476. bool "Dynamic atexit() Support"
  477. default y
  478. help
  479. When this option is enabled, uClibc will support an infinite number,
  480. of atexit() and on_exit() functions, limited only by your available
  481. memory. This can be important when uClibc is used with C++, since
  482. global destructors are implemented via atexit(), and it is quite
  483. possible to exceed the default number when this option is disabled.
  484. Enabling this option adds a few bytes, and more significantly makes
  485. atexit and on_exit depend on malloc, which can be bad when compiling
  486. static executables.
  487. Unless you use uClibc with C++, you should probably answer N.
  488. config COMPAT_ATEXIT
  489. bool "Old (visible) atexit Support"
  490. default n
  491. help
  492. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  493. else you will be missing atexit() until you rebuild all apps.
  494. config UCLIBC_SUSV3_LEGACY
  495. bool "Enable SuSv3 LEGACY functions"
  496. default n
  497. #vfork,
  498. # h_errno
  499. # gethostbyaddr
  500. # gethostbyname
  501. help
  502. Enable this option if you want to have SuSv3 LEGACY functions
  503. in the library, else they are replaced by SuSv3 proposed macros.
  504. Currently applies to:
  505. bcmp, bcopy, bzero, index, rindex, ftime,
  506. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  507. (getwd), (makecontext),
  508. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  509. scalb, (setcontext), (swapcontext), ualarm, usleep,
  510. wcswcs.
  511. WARNING! ABI incompatibility.
  512. config UCLIBC_SUSV3_LEGACY_MACROS
  513. bool "Enable SuSv3 LEGACY macros"
  514. default n
  515. help
  516. Enable this option if you want to have SuSv3 LEGACY macros.
  517. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  518. WARNING! ABI incompatibility.
  519. config UCLIBC_SUSV4_LEGACY
  520. bool "Enable SuSv4 LEGACY or obsolescent functions"
  521. default n
  522. help
  523. Enable this option if you want to have SuSv4 LEGACY functions
  524. and macros in the library.
  525. Currently applies to:
  526. - XSI functions:
  527. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  528. gettimeofday, isascii, pthread_getconcurrency,
  529. pthread_setconcurrency, setitimer, setpgrp, sighold,
  530. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  531. tempnam, toascii, ulimit.
  532. - Base functions:
  533. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  534. tmpnam, utime.
  535. WARNING! ABI incompatibility.
  536. config UCLIBC_HAS_STUBS
  537. bool "Provide stubs for unavailable functionality"
  538. default n
  539. help
  540. With this option uClibc provides non-functional stubs for
  541. functions which are impossible to implement on the target
  542. architecture. Otherwise, such functions are simply omitted.
  543. As of 2008-07, this option makes uClibc provide fork() stub
  544. on NOMMU targets. It always sets errno to ENOSYS and returns -1.
  545. This may be useful if you port a lot of software and cannot
  546. audit all of it and replace or disable fork() usage.
  547. With this option, a program which uses fork() will build
  548. successfully. Of course, it may be useless if fork()
  549. is essential for its operation.
  550. config UCLIBC_HAS_SHADOW
  551. bool "Shadow Password Support"
  552. default y
  553. help
  554. Answer N if you do not need shadow password support.
  555. Most people will answer Y.
  556. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  557. bool "Support for program_invocation_name"
  558. default n
  559. help
  560. Support for the GNU-specific program_invocation_name and
  561. program_invocation_short_name strings. Some GNU packages
  562. (like tar and coreutils) utilize these for extra useful
  563. output, but in general are not required.
  564. At startup, these external strings are automatically set
  565. up based on the value of ARGV[0].
  566. If unsure, just answer N.
  567. config UCLIBC_HAS___PROGNAME
  568. bool "Support for __progname"
  569. default y
  570. depends on UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  571. help
  572. Some packages (like openssh) like to peek into internal libc
  573. symbols to make their output a bit more user friendly.
  574. At startup, __progname is automatically set up based on the
  575. value of ARGV[0].
  576. If unsure, just answer N.
  577. config UCLIBC_HAS_PTY
  578. bool "Support for pseudo-terminals"
  579. default y
  580. help
  581. This enables support for pseudo-terminals (see man 4 pts
  582. and man 7 pty).
  583. If unsure, just answer Y.
  584. config ASSUME_DEVPTS
  585. bool "Assume that /dev/pts is a devpts or devfs file system"
  586. default y
  587. depends on UCLIBC_HAS_PTY
  588. help
  589. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  590. these filesystems automatically manage permissions on the /dev/pts
  591. devices. You may need to mount your devpts or devfs filesystem on
  592. /dev/pts for this to work.
  593. Most people should answer Y.
  594. config UNIX98PTY_ONLY
  595. bool "Support only Unix 98 PTYs"
  596. default y
  597. depends on UCLIBC_HAS_PTY
  598. help
  599. If you want to support only Unix 98 PTYs enable this. Some older
  600. applications may need this disabled and will thus use legacy BSD
  601. style PTY handling which is more complex and also bigger than
  602. Unix 98 PTY handling.
  603. For most current programs, you can generally answer Y.
  604. if UNIX98PTY_ONLY
  605. config UCLIBC_HAS_GETPT
  606. bool "Support getpt() (glibc-compat)"
  607. default n
  608. depends on UCLIBC_HAS_PTY
  609. help
  610. Some packages may need getpt().
  611. All of those are non-standard and can be considered
  612. GNU/libc compatibility.
  613. Either use posix_openpt() or just open /dev/ptmx yourself.
  614. If unsure, just say N.
  615. endif
  616. if !UNIX98PTY_ONLY
  617. # Have to use __libc_ptyname{1,2}[] and related bloat
  618. config UCLIBC_HAS_GETPT
  619. def_bool y
  620. endif
  621. config UCLIBC_HAS_LIBUTIL
  622. bool "Provide libutil library and functions"
  623. depends on UCLIBC_HAS_PTY
  624. default n
  625. help
  626. Provide a libutil library.
  627. This non-standard conforming library provides the following
  628. utility functions:
  629. forkpty(): combines openpty(), fork(2), and login_tty() to
  630. create a new process operating in a pseudo-terminal.
  631. login(): write utmp and wtmp entries
  632. login_tty(): prepares for a login on the tty fd by creating a
  633. new session, making fd the controlling terminal for
  634. the calling process, setting fd to be the standard
  635. input, output, and error streams of the current
  636. process, and closing fd.
  637. logout(): write utmp and wtmp entries
  638. logwtmp(): constructs a utmp structure and calls updwtmp() to
  639. append the structure to the utmp file.
  640. openpty(): finds an available pseudo-terminal and returns
  641. file descriptors for the master and slave
  642. This library adds about 3k-4k to your system.
  643. config UCLIBC_HAS_TM_EXTENSIONS
  644. bool "Support 'struct tm' timezone extension fields"
  645. default y
  646. help
  647. Enabling this option adds fields to 'struct tm' in time.h for
  648. tracking the number of seconds east of UTC, and an abbreviation for
  649. the current timezone. These fields are not specified by the SuSv3
  650. standard, but they are commonly used in both GNU and BSD application
  651. code.
  652. To strictly follow the SuSv3 standard, leave this disabled.
  653. Most people will probably want to answer Y.
  654. config UCLIBC_HAS_TZ_CACHING
  655. bool "Enable caching of the last valid timezone 'TZ' string"
  656. default y
  657. help
  658. Answer Y to enable caching of the last valid 'TZ' string describing
  659. the timezone setting. This allows a quick string compare to avoid
  660. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  661. Most people will answer Y.
  662. config UCLIBC_HAS_TZ_FILE
  663. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  664. default y
  665. help
  666. Answer Y to enable the setting of a default timezone for uClibc.
  667. Ordinarily, uClibc gets the timezone information exclusively from the
  668. 'TZ' environment variable. In particular, there is no support for
  669. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  670. With this option enabled, uClibc will use the value stored in the
  671. file '/etc/TZ' (default path) to obtain timezone information if the
  672. 'TZ' environment variable is missing or has an invalid value. The
  673. file consists of a single line (newline required) of text describing
  674. the timezone in the format specified for the TZ environment variable.
  675. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  676. See
  677. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  678. for details on valid settings of 'TZ'.
  679. Most people will answer Y.
  680. config UCLIBC_HAS_TZ_FILE_READ_MANY
  681. bool "Repeatedly read the '/etc/TZ' file"
  682. depends on UCLIBC_HAS_TZ_FILE
  683. default y
  684. help
  685. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  686. a valid value has been read. This incurs the overhead of an
  687. open/read/close for each tzset() call (explicit or implied). However,
  688. setting this will allow applications to update their timezone
  689. information if the contents of the file change.
  690. Most people will answer Y.
  691. config UCLIBC_TZ_FILE_PATH
  692. string "Path to the 'TZ' file for setting the global timezone"
  693. depends on UCLIBC_HAS_TZ_FILE
  694. default "/etc/TZ"
  695. help
  696. This is the path to the 'TZ' file.
  697. Most people will use the default of '/etc/TZ'.
  698. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  699. bool "Use /etc/localtime as a fallback"
  700. depends on UCLIBC_HAS_TZ_FILE
  701. default y
  702. help
  703. Answer Y to try to use /etc/localtime file.
  704. On glibc systems this file (if it is in TZif2 format)
  705. contains timezone string at the end.
  706. Most people will answer Y.
  707. endmenu
  708. menu "Advanced Library Settings"
  709. config UCLIBC_PWD_BUFFER_SIZE
  710. int "Buffer size for getpwnam() and friends"
  711. default 256
  712. range 12 1024
  713. help
  714. This sets the value of the buffer size for getpwnam() and friends.
  715. By default, this is 256. (For reference, glibc uses 1024).
  716. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  717. parameter.
  718. config UCLIBC_GRP_BUFFER_SIZE
  719. int "Buffer size for getgrnam() and friends"
  720. default 256
  721. range 12 1024
  722. help
  723. This sets the value of the buffer size for getgrnam() and friends.
  724. By default, this is 256. (For reference, glibc uses 1024).
  725. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  726. parameter.
  727. comment "Support various families of functions"
  728. config UCLIBC_LINUX_MODULE_24
  729. bool "Linux kernel module functions"
  730. default !(TARGET_bfin)
  731. help
  732. create_module, query_module
  733. are used in linux (prior to 2.6) for loadable kernel modules.
  734. Say N if you do not use kernel modules, or you only support
  735. Linux 2.6+.
  736. config UCLIBC_LINUX_SPECIFIC
  737. bool "Linux specific functions"
  738. default y
  739. help
  740. capget(), capset(), fstatfs(), inotify_*(), ioperm(), iopl(),
  741. madvise(), modify_ldt(), personality(), prctl()/arch_prctl(),
  742. ppoll(), readahead(), reboot(), remap_file_pages(),
  743. sched_getaffinity(), sched_setaffinity(), sendfile(),
  744. setfsgid(), setfsuid(), setresuid(),
  745. splice(), vmsplice(), tee(), signalfd(), swapoff(), swapon(),
  746. sync_file_range(), sysctl(), sysinfo(), vhangup()
  747. config UCLIBC_HAS_GNU_ERROR
  748. bool "Support GNU extensions for error-reporting"
  749. default y
  750. help
  751. Support for the GNU-specific error(), error_at_line(),
  752. void (* error_print_progname)(), error_message_count
  753. functions and variables. Some GNU packages
  754. utilize these for extra useful output, but in general
  755. are not required.
  756. If unsure, just answer N.
  757. config UCLIBC_BSD_SPECIFIC
  758. bool "BSD specific functions"
  759. default y
  760. help
  761. mincore(), getdomainname(), setdomainname()
  762. If unsure, say N.
  763. config UCLIBC_HAS_BSD_ERR
  764. bool "BSD err functions"
  765. default y
  766. help
  767. These functions are non-standard BSD extensions.
  768. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  769. If unsure, say N.
  770. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  771. bool "BSD obsolete signal functions"
  772. default n
  773. help
  774. These functions are provided as a compatibility interface for
  775. programs that make use of the historical System V signal API.
  776. This API is obsolete:
  777. new applications should use the POSIX signal API (sigaction(2),
  778. sigprocmask(2), etc.).
  779. Affected functions:
  780. sigset(), sighold(), sigrelse(), sigignore()
  781. If unsure, say N.
  782. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  783. bool "SYSV obsolete signal functions"
  784. default n
  785. help
  786. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  787. If unsure, say N.
  788. config UCLIBC_NTP_LEGACY
  789. bool "ntp_*() aliases"
  790. default n
  791. help
  792. Provide legacy aliases for ntp functions:
  793. ntp_adjtime(), ntp_gettime()
  794. It is safe to say N here.
  795. config UCLIBC_SV4_DEPRECATED
  796. bool "Enable SVr4 deprecated functions"
  797. default n
  798. help
  799. These functions are DEPRECATED in System V release 4.
  800. Say N unless you desparately need one of the functions below:
  801. ustat() [use statfs(2) in your code instead]
  802. config UCLIBC_HAS_REALTIME
  803. bool "Realtime-related family of SUSv functions"
  804. default y
  805. help
  806. These functions are part of the Timers option and need not
  807. be available on all implementations.
  808. Includes AIO, message-queue, scheduler, semaphore functions:
  809. aio.h
  810. mqueue.h
  811. sched.h
  812. semaphore.h
  813. aio_cancel()
  814. aio_error()
  815. aio_fsync()
  816. aio_read()
  817. lio_listio()
  818. aio_return()
  819. aio_suspend()
  820. aio_write()
  821. clock_getres(), clock_gettime(), clock_settime()
  822. fdatasync()
  823. mlockall(), munlockall()
  824. mlock(), munlock()
  825. mq_close()
  826. mq_getattr()
  827. mq_notify()
  828. mq_open()
  829. mq_receive()
  830. mq_send()
  831. mq_setattr()
  832. mq_unlink()
  833. nanosleep()
  834. sched_getparam()
  835. sched_get_priority_max(), sched_get_priority_min()
  836. sched_getscheduler()
  837. sched_rr_get_interval()
  838. sched_setparam()
  839. sched_setscheduler()
  840. sem_close()
  841. sem_destroy()
  842. sem_getvalue()
  843. sem_init()
  844. sem_open()
  845. sem_post()
  846. sem_trywait(), sem_wait()
  847. sem_unlink()
  848. sigqueue()
  849. sigtimedwait(), sigwaitinfo()
  850. timer_create()
  851. timer_delete()
  852. timer_getoverrun(), timer_gettime(), timer_settime()
  853. config UCLIBC_HAS_ADVANCED_REALTIME
  854. bool "Advanced realtime-related family of SUSv functions"
  855. default y
  856. depends on UCLIBC_HAS_REALTIME
  857. help
  858. These functions are part of the Timers option and need not
  859. be available on all implementations.
  860. clock_getcpuclockid()
  861. clock_nanosleep()
  862. mq_timedreceive()
  863. mq_timedsend()
  864. posix_fadvise()
  865. posix_fallocate()
  866. posix_madvise()
  867. posix_memalign()
  868. posix_mem_offset()
  869. posix_spawnattr_destroy(), posix_spawnattr_init()
  870. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  871. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  872. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  873. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  874. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  875. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  876. posix_spawn_file_actions_addclose()
  877. posix_spawn_file_actions_adddup2()
  878. posix_spawn_file_actions_addopen()
  879. posix_spawn_file_actions_destroy()
  880. posix_spawn_file_actions_init()
  881. posix_spawn()
  882. posix_spawnp()
  883. posix_typed_mem_get_info()
  884. pthread_mutex_timedlock()
  885. sem_timedwait()
  886. #config UCLIBC_HAS_TERMIOS
  887. # bool "termios functions"
  888. # default y
  889. # help
  890. # Get and set terminal attributes, line control, get and set baud
  891. # rate.
  892. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  893. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  894. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  895. #
  896. # If unsure, say Y.
  897. config UCLIBC_HAS_EPOLL
  898. bool "epoll"
  899. default y
  900. help
  901. epoll_create(), epoll_ctl(), epoll_wait() functions.
  902. config UCLIBC_HAS_XATTR
  903. bool "Extended Attributes"
  904. default y
  905. help
  906. Extended Attributes support.
  907. setxattr()
  908. lsetxattr()
  909. fsetxattr()
  910. getxattr()
  911. lgetxattr()
  912. fgetxattr()
  913. listxattr()
  914. llistxattr()
  915. flistxattr()
  916. removexattr()
  917. lremovexattr()
  918. fremovexattr()
  919. Say N unless you need support for extended attributes and the
  920. filesystems do actually support them.
  921. config UCLIBC_HAS_PROFILING
  922. bool "Profiling support"
  923. default y
  924. help
  925. gcc's -finstrument-functions needs these.
  926. Most people can safely answer N.
  927. config UCLIBC_HAS_CRYPT_IMPL
  928. bool "libcrypt support"
  929. default y
  930. help
  931. libcrypt contains crypt(), setkey() and encrypt()
  932. config UCLIBC_HAS_CRYPT_STUB
  933. bool "libcrypt stubs"
  934. default y
  935. depends on !UCLIBC_HAS_CRYPT_IMPL
  936. help
  937. Standards mandate that crypt(3) provides a stub if it is unavailable.
  938. If you enable this option then stubs for
  939. crypt(), setkey() and encrypt()
  940. will be provided in a small libcrypt.
  941. config UCLIBC_HAS_CRYPT
  942. def_bool y
  943. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  944. endmenu
  945. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  946. bool "Networking Support"
  947. default y
  948. help
  949. Say N here if you do not need network support.
  950. if UCLIBC_HAS_NETWORK_SUPPORT
  951. config UCLIBC_HAS_SOCKET
  952. bool "Socket support"
  953. default y
  954. help
  955. If you want to include support for sockets then answer Y.
  956. config UCLIBC_HAS_IPV4
  957. bool "IP version 4 support"
  958. default y
  959. select UCLIBC_HAS_SOCKET
  960. help
  961. If you want to include support for the Internet Protocol
  962. (IP version 4) then answer Y.
  963. Most people will say Y.
  964. config UCLIBC_HAS_IPV6
  965. bool "IP version 6 support"
  966. default n
  967. select UCLIBC_HAS_SOCKET
  968. help
  969. If you want to include support for the next version of the Internet
  970. Protocol (IP version 6) then answer Y.
  971. Most people should answer N.
  972. config UCLIBC_HAS_RPC
  973. bool "Remote Procedure Call (RPC) support"
  974. default n
  975. # RPC+socket-ipvX doesn't currently work.
  976. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  977. help
  978. If you want to include RPC support, enable this. RPC is rarely used
  979. for anything except for the NFS filesystem. Unless you plan to use
  980. NFS, you can probably leave this set to N and save some space.
  981. If you need to use NFS then you should answer Y.
  982. config UCLIBC_HAS_FULL_RPC
  983. bool "Full RPC support"
  984. depends on UCLIBC_HAS_RPC
  985. default y if !HAVE_SHARED
  986. help
  987. Normally we enable just enough RPC support for things like rshd and
  988. nfs mounts to work. If you find you need the rest of the RPC stuff,
  989. then enable this option. Most people can safely answer N.
  990. config UCLIBC_HAS_REENTRANT_RPC
  991. bool "Reentrant RPC support"
  992. depends on UCLIBC_HAS_RPC
  993. default y if !HAVE_SHARED
  994. help
  995. Most packages utilize the normal (non-reentrant) RPC functions, but
  996. some (like exportfs from nfs-utils) need these reentrant versions.
  997. Most people can safely answer N.
  998. config UCLIBC_USE_NETLINK
  999. bool "Use netlink to query interfaces"
  1000. default n
  1001. depends on UCLIBC_HAS_SOCKET
  1002. help
  1003. In newer versions of Linux (2.4.17+), support was added for querying
  1004. network device information via netlink rather than the old style
  1005. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1006. it is smaller than netlink), but if you find that not all of your
  1007. devices are being returned by the if_nameindex() function, you will
  1008. have to use the netlink implementation.
  1009. Most people can safely answer N.
  1010. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1011. bool "Support the AI_ADDRCONFIG flag"
  1012. depends on UCLIBC_USE_NETLINK
  1013. default n
  1014. help
  1015. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1016. implementation using netlink to query interfaces to find both
  1017. ipv4 and ipv6 support. This is only needed if an application uses
  1018. the AI_ADDRCONFIG flag.
  1019. Most people can safely answer N.
  1020. config UCLIBC_HAS_BSD_RES_CLOSE
  1021. bool "Support res_close() (bsd-compat)"
  1022. default n
  1023. help
  1024. Answer Y if you desperately want to support BSD compatibility in
  1025. the network code.
  1026. Most people will say N.
  1027. config UCLIBC_HAS_COMPAT_RES_STATE
  1028. bool "Use compatible but bloated _res"
  1029. default y
  1030. help
  1031. Answer Y if you build network utilities and they muck with resolver
  1032. internals a lot (_res global structure). uclibc does not use most
  1033. of _res.XXX fields, and with this option OFF they won't even exist.
  1034. Which will make e.g. dig build fail.
  1035. Answering N saves around 400 bytes in bss.
  1036. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1037. bool "Use extra compatible but extra bloated _res"
  1038. default n
  1039. help
  1040. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1041. As far as I can say, this should never be needed.
  1042. config UCLIBC_HAS_LIBRESOLV_STUB
  1043. bool "Provide libresolv stub"
  1044. default n
  1045. help
  1046. Provide a dummy resolv library.
  1047. config UCLIBC_HAS_LIBNSL_STUB
  1048. bool "Provide libnsl stub"
  1049. default n
  1050. help
  1051. Provide a dummy nsl library.
  1052. endif
  1053. menu "String and Stdio Support"
  1054. config UCLIBC_HAS_STRING_GENERIC_OPT
  1055. bool "Use faster (but larger) generic string functions"
  1056. default y
  1057. help
  1058. Answer Y to use the (tweaked) glibc generic string functions.
  1059. In general, they are faster (but 3-5K larger) than the base
  1060. uClibc string functions which are optimized solely for size.
  1061. Many people will answer Y.
  1062. config UCLIBC_HAS_STRING_ARCH_OPT
  1063. bool "Use arch-specific assembly string functions (where available)"
  1064. default y
  1065. help
  1066. Answer Y to use any archtecture-specific assembly language string
  1067. functions available for this target plaform.
  1068. Note that assembly implementations are not available for all string
  1069. functions, so some generic (written in C) string functions may
  1070. still be used.
  1071. These are small and fast, the only reason _not_ to say Y here is
  1072. for debugging purposes.
  1073. config UCLIBC_HAS_CTYPE_TABLES
  1074. bool "Use Table Versions Of 'ctype.h' Functions."
  1075. default y
  1076. help
  1077. Answer Y to use table versions of the 'ctype.h' functions.
  1078. While the non-table versions are often smaller when building
  1079. statically linked apps, they work only in stub locale mode.
  1080. Most people will answer Y.
  1081. config UCLIBC_HAS_CTYPE_SIGNED
  1082. bool "Support Signed Characters In 'ctype.h' Functions."
  1083. depends on UCLIBC_HAS_CTYPE_TABLES
  1084. default y
  1085. help
  1086. Answer Y to enable support for passing signed char values to
  1087. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1088. these functions are only defined for unsigned char values and
  1089. EOF. However, glibc allows negative signed char values as well
  1090. in order to support 'broken old programs'.
  1091. Most people will answer Y.
  1092. choice
  1093. prompt "ctype argument checking"
  1094. depends on UCLIBC_HAS_CTYPE_TABLES
  1095. default UCLIBC_HAS_CTYPE_UNSAFE
  1096. help
  1097. Please select the invalid arg behavior you want for the 'ctype'
  1098. functions.
  1099. The 'ctype' functions are now implemented using table lookups, with
  1100. the arg being the index. This can result in incorrect memory accesses
  1101. or even segfaults for args outside of the allowed range.
  1102. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1103. the macro implementations.
  1104. config UCLIBC_HAS_CTYPE_UNSAFE
  1105. bool "Do not check -- unsafe"
  1106. config UCLIBC_HAS_CTYPE_CHECKED
  1107. bool "Detect and handle appropriately"
  1108. config UCLIBC_HAS_CTYPE_ENFORCED
  1109. bool "Issue a diagnostic and abort()"
  1110. endchoice
  1111. config UCLIBC_HAS_WCHAR
  1112. bool "Wide Character Support"
  1113. default n
  1114. help
  1115. Answer Y to enable wide character support. This will make uClibc
  1116. much larger. It is also currently required for locale support.
  1117. Most people will answer N.
  1118. config UCLIBC_HAS_LOCALE
  1119. bool "Locale Support"
  1120. select UCLIBC_HAS_WCHAR
  1121. select UCLIBC_HAS_CTYPE_TABLES
  1122. default n
  1123. help
  1124. uClibc now has full ANSI/ISO C99 locale support (except for
  1125. wcsftime() and collating items in regex). Be aware that enabling
  1126. this option will make uClibc much larger.
  1127. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1128. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1129. uClibc by around 300k. You can reduce this size by building your own
  1130. custom set of locate data (see extra/locale/LOCALES for details).
  1131. uClibc's locale support is still under development. For example,
  1132. codesets using shift states are not currently supported. Support is
  1133. planned in the next iteration of locale support.
  1134. Answer Y to enable locale support. Most people will answer N.
  1135. choice
  1136. prompt "Locale data"
  1137. depends on UCLIBC_HAS_LOCALE
  1138. default UCLIBC_BUILD_ALL_LOCALE
  1139. config UCLIBC_BUILD_ALL_LOCALE
  1140. bool "All locales"
  1141. depends on UCLIBC_HAS_LOCALE
  1142. help
  1143. This builds all the locales that are available on your
  1144. host-box.
  1145. config UCLIBC_BUILD_MINIMAL_LOCALE
  1146. bool "Only selected locales"
  1147. depends on UCLIBC_HAS_LOCALE
  1148. help
  1149. If you do not need all locales that are available on your
  1150. host-box, then set this to 'Y'.
  1151. config UCLIBC_PREGENERATED_LOCALE_DATA
  1152. bool "Use Pre-generated Locale Data"
  1153. depends on UCLIBC_HAS_LOCALE
  1154. help
  1155. Use pre-built locale data.
  1156. Note that these pregenerated locales are sensitive to your
  1157. target architecture (endianess, bitcount).
  1158. Saying N here is highly recommended.
  1159. endchoice
  1160. config UCLIBC_BUILD_MINIMAL_LOCALES
  1161. string "locales to use"
  1162. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1163. default "en_US"
  1164. help
  1165. Space separated list of locales to use.
  1166. E.g.:
  1167. en_US en_GB de_AT
  1168. default:
  1169. en_US
  1170. config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
  1171. bool "Automagically Download the Pre-generated Locale Data (if necessary)"
  1172. depends on UCLIBC_PREGENERATED_LOCALE_DATA
  1173. default n
  1174. help
  1175. If you would like the build process to use 'wget' to automatically
  1176. download the pregenerated locale data, enable this option. Otherwise
  1177. you will need to obtain the locale data yourself from:
  1178. http://www.uclibc.org/downloads/uClibc-locale-*.tgz
  1179. and place the uClibc-locale-*.tgz tarball in the extra/locale/
  1180. directory.
  1181. Note that the use of pregenerated locale data is discouraged.
  1182. config UCLIBC_HAS_XLOCALE
  1183. bool "Extended Locale Support (experimental/incomplete)"
  1184. depends on UCLIBC_HAS_LOCALE
  1185. default n
  1186. help
  1187. Answer Y to enable extended locale support similar to that provided
  1188. by glibc. This is primarily intended to support libstd++
  1189. functionality.
  1190. However, it also allows thread-specific locale selection via
  1191. uselocale().
  1192. Most people will answer N.
  1193. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1194. bool "Support hexadecimal float notation"
  1195. depends on UCLIBC_HAS_CTYPE_TABLES
  1196. depends on UCLIBC_HAS_FLOATS
  1197. default n
  1198. help
  1199. Answer Y to enable support for hexadecimal float notation in the
  1200. (wchar and) char string to floating point conversion functions, as
  1201. well as support for the %a and %A conversion specifiers in the
  1202. *printf() and *scanf() functions.
  1203. Most people will answer N.
  1204. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1205. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1206. depends on UCLIBC_HAS_LOCALE
  1207. depends on UCLIBC_HAS_FLOATS
  1208. default n
  1209. help
  1210. Answer Y to enable support for glibc's \"'\" flag for allowing
  1211. locale-specific digit grouping in base 10 integer conversions and
  1212. appropriate floating point conversions in the *printf() and *scanf()
  1213. functions.
  1214. Most people will answer N.
  1215. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1216. bool "Do not require digit grouping when the \"'\" flag is specified"
  1217. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1218. default y
  1219. help
  1220. Answer Y to make digit grouping optional when the \"'\" flag is
  1221. specified.
  1222. This is the standard glibc behavior. If the initial string of digits
  1223. exceeds the maximum group number, the input will be treated as a
  1224. normal non-grouped number.
  1225. Most people will answer N.
  1226. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1227. bool "Support glibc's register_printf_function() (glibc-compat)"
  1228. depends on !USE_OLD_VFPRINTF
  1229. default n
  1230. help
  1231. Answer Y to support glibc's register_printf_function() to allow an
  1232. application to add its own printf conversion specifiers.
  1233. NOTE: Limits the number or registered specifiers to 10.
  1234. NOTE: Requires new conversion specifiers to be ASCII
  1235. characters (0-0x7f). This is to avoid problems with processing
  1236. format strings in locales with different multibyte conversions.
  1237. Most people will answer N.
  1238. config USE_OLD_VFPRINTF
  1239. bool "Use the old vfprintf implementation"
  1240. depends on !UCLIBC_HAS_WCHAR
  1241. default n
  1242. help
  1243. Set to true to use the old vfprintf instead of the new. This is
  1244. roughly C89 compliant with some extensions, and is much smaller.
  1245. However, it does not support wide chars, positional args, or glibc
  1246. custom printf specifiers.
  1247. Most people will answer N.
  1248. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1249. int "Maximum number of positional args. Either 0 or >= 9."
  1250. depends on !USE_OLD_VFPRINTF
  1251. default 9
  1252. help
  1253. Set the maximum number of positional args supported by the
  1254. printf/scanf functions. The Single Unix Specification Version 3
  1255. requires a minimum value of 9. Setting this to a value lower than
  1256. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1257. in limits.h to be #undef'd.
  1258. WARNING! The workspace to support positional args is currently
  1259. allocated on the stack. You probably don't want to set
  1260. this to too high a value.
  1261. Most people will answer 9.
  1262. config UCLIBC_HAS_SCANF_GLIBC_A_FLAG
  1263. bool "Support glibc's 'a' flag for scanf string conversions (not implemented)"
  1264. default n
  1265. help
  1266. NOTE!!! Currently Not Implemented!!! Just A Place Holder!! NOTE!!!
  1267. NOTE!!! Conflicts with an ANSI/ISO C99 scanf flag!! NOTE!!!
  1268. Answer Y to enable support for glibc's 'a' flag for the scanf string
  1269. conversions '%s', '%[', '%ls', '%l[', and '%S'. This is used to
  1270. auto-allocate sufficient memory to hold the data retrieved.
  1271. Most people will answer N.
  1272. choice
  1273. prompt "Stdio buffer size"
  1274. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1275. help
  1276. Please select a value for BUFSIZ. This will be used by the
  1277. stdio subsystem as the default buffer size for a file, and
  1278. affects fopen(), setvbuf(), etc.
  1279. NOTE: Setting this to 'none' will disable buffering completely.
  1280. However, BUFSIZ will still be defined in stdio.h as 256 because
  1281. many applications use this value.
  1282. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1283. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1284. depends on !UCLIBC_HAS_WCHAR
  1285. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1286. bool "256 (minimum ANSI/ISO C99 value)"
  1287. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1288. bool "512"
  1289. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1290. bool "1024"
  1291. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1292. bool "2048"
  1293. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1294. bool "4096"
  1295. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1296. bool "8192"
  1297. # If you add more choices, you will need to update uClibc_stdio.h.
  1298. endchoice
  1299. choice
  1300. prompt "Stdio builtin buffer size (uClibc-specific)"
  1301. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1302. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1303. help
  1304. When a FILE is created with fopen(), an attempt is made to allocate
  1305. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1306. succeed but the FILE will be unbuffered.
  1307. This option adds a small amount of space to each FILE to act as an
  1308. emergency buffer in the event of a buffer allocation failure.
  1309. Most people will answer None.
  1310. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1311. bool "None"
  1312. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1313. bool "4"
  1314. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1315. bool "8"
  1316. # If you add more choices, you will need to update uClibc_stdio.h.
  1317. endchoice
  1318. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1319. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1320. default n
  1321. help
  1322. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1323. a behavioral change made in SUSv3. Previously, abort() was required
  1324. to have the affect of fclose() on all open streams. The wording has
  1325. been changed to "may" from "shall".
  1326. Most people will answer N.
  1327. config UCLIBC_HAS_STDIO_GETC_MACRO
  1328. bool "Provide a macro version of getc()"
  1329. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1330. default y
  1331. help
  1332. Provide a macro version of getc().
  1333. Most people will answer Y.
  1334. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1335. bool "Provide a macro version of putc()"
  1336. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1337. default y
  1338. help
  1339. Provide a macro version of putc().
  1340. Most people will answer Y.
  1341. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1342. bool "Support auto-r/w transition"
  1343. default y
  1344. help
  1345. Answer Y to enable the stdio subsystem to automaticly transition
  1346. between reading and writing. This relaxes the ANSI/ISO C99
  1347. requirement:
  1348. When a file is opened with update mode ('+' as the second or third
  1349. character in the list of mode argument values), both input and output
  1350. may be performed on the associated stream. However, output shall not
  1351. be directly followed by input without an intervening call to the
  1352. fflush function or to a file positioning function (fseek, fsetpos,
  1353. or rewind), and input shall not be directly followed by output without
  1354. an intervening call to a file positioning function, unless the input
  1355. operation encounters end­of­file.
  1356. Most people will answer Y.
  1357. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1358. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1359. depends on UCLIBC_HAS_LFS
  1360. default n
  1361. help
  1362. Answer Y to enable a uClibc-specific extension to allow passing an
  1363. additional 'F' flag in the mode string for fopen() to specify that
  1364. the file should be open()ed with the O_LARGEFILE flag set.
  1365. Most people will answer N.
  1366. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1367. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1368. default n
  1369. help
  1370. Answer Y to support a glibc extension to allow passing
  1371. additional 'x' flag in the mode string for fopen() to specify that
  1372. the file should be open()ed with the O_EXCL flag set.
  1373. Most people will answer N.
  1374. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1375. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1376. default n
  1377. help
  1378. Answer Y to support the glibc 'custom stream' extension functions
  1379. fmemopen(), open_memstream(), and fopencookie().
  1380. NOTE: There are some minor differences regarding seeking behavior.
  1381. Most people will answer N.
  1382. config UCLIBC_HAS_PRINTF_M_SPEC
  1383. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1384. default n
  1385. help
  1386. Answer Y to support a glibc extension to interpret '%m' in printf
  1387. format strings as an instruction to output the error message string
  1388. (as generated by strerror) corresponding to the current value of
  1389. 'errno'.
  1390. Most people will answer N.
  1391. config UCLIBC_HAS_ERRNO_MESSAGES
  1392. bool "Include the errno message text in the library"
  1393. default y
  1394. help
  1395. Answer Y if you want to include the errno message text in the
  1396. library. This adds about 3K to the library, but enables strerror()
  1397. to generate text other than 'Unknown error <number>'.
  1398. Most people will answer Y.
  1399. config UCLIBC_HAS_SYS_ERRLIST
  1400. bool "Support sys_errlist[] (obsolete-compat)"
  1401. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1402. default n
  1403. help
  1404. Answer Y if you want to support the obsolete sys_errlist[].
  1405. This adds about 0.5k to the library, except for the mips
  1406. arch where it adds over 4K.
  1407. WARNING! In the future, support for sys_errlist[] may be unavailable
  1408. in at least some configurations. In fact, it may be removed
  1409. altogether.
  1410. Most people will answer N.
  1411. Application writers: use the strerror(3) function.
  1412. config UCLIBC_HAS_SIGNUM_MESSAGES
  1413. bool "Include the signum message text in the library"
  1414. default y
  1415. help
  1416. Answer Y if you want to include the signum message text in the
  1417. library. This adds about 0.5K to the library, but enables strsignal()
  1418. to generate text other than 'Unknown signal <number>'.
  1419. Most people will answer Y.
  1420. config UCLIBC_HAS_SYS_SIGLIST
  1421. bool "Support sys_siglist[] (bsd-compat)"
  1422. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1423. default n
  1424. help
  1425. Answer Y if you want to support sys_siglist[].
  1426. WARNING! In the future, support for sys_siglist[] may be unavailable
  1427. in at least some configurations. In fact, it may be removed
  1428. altogether.
  1429. Most people will answer N.
  1430. config UCLIBC_HAS_GETTEXT_AWARENESS
  1431. bool "Include gettext awareness"
  1432. depends on UCLIBC_HAS_LOCALE && UCLIBC_MJN3_ONLY
  1433. default n
  1434. help
  1435. NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
  1436. Answer Y if you want to include weak stub gettext support and
  1437. make the *strerror*() and strsignal() functions gettext-aware.
  1438. Currently, to get functional gettext functionality you will need
  1439. to use gnu gettext.
  1440. Most people will answer N.
  1441. config UCLIBC_HAS_GNU_GETOPT
  1442. bool "Support gnu getopt"
  1443. default y
  1444. help
  1445. Answer Y if you want to include full gnu getopt() instead of a
  1446. (much smaller) SUSv3 compatible getopt().
  1447. Most people will answer Y.
  1448. config UCLIBC_HAS_STDIO_FUTEXES
  1449. bool "Use futexes for multithreaded I/O locking"
  1450. default n
  1451. depends on UCLIBC_HAS_THREADS_NATIVE
  1452. help
  1453. If you want to compile uClibc to use futexes for low-level
  1454. I/O locking, answer Y. Otherwise, answer N.
  1455. config UCLIBC_HAS_GETOPT_LONG
  1456. bool "Support getopt_long/getopt_long_only"
  1457. depends on !UCLIBC_HAS_GNU_GETOPT
  1458. default y
  1459. help
  1460. Answer Y if you want to include getopt_long[_only() used by many
  1461. apps, even busybox.
  1462. Most people will answer Y.
  1463. config UCLIBC_HAS_GNU_GETSUBOPT
  1464. bool "Support glibc getsubopt"
  1465. default y
  1466. help
  1467. Answer Y if you want to include glibc getsubopt() instead of a
  1468. smaller SUSv3 compatible getsubopt().
  1469. Most people will answer Y.
  1470. endmenu
  1471. menu "Big and Tall"
  1472. config UCLIBC_HAS_REGEX
  1473. bool "Regular Expression Support"
  1474. default y
  1475. help
  1476. POSIX regular expression code is really big -- 53k all by itself.
  1477. If you don't use regular expressions, turn this off and save space.
  1478. Of course, if you only statically link, leave this on, since it will
  1479. only be included in your apps if you use regular expressions.
  1480. config UCLIBC_HAS_REGEX_OLD
  1481. bool "Use the older (stable) regular expression code"
  1482. depends on UCLIBC_HAS_REGEX
  1483. default y
  1484. help
  1485. There are two versions of regex. The older (stable) version has
  1486. been in uClibc for quite a long time but hasn't seen too many
  1487. updates. It also has some known issues when dealing with uncommon
  1488. corner cases and multibyte/unicode strings. However, it is quite
  1489. a bit smaller than the newer version.
  1490. If the older version has worked for you and you don't need unicode
  1491. support, then stick with the old version (and say Y here).
  1492. Otherwise, you should use the new version (and say N here).
  1493. config UCLIBC_HAS_FNMATCH
  1494. bool "fnmatch Support"
  1495. default y
  1496. help
  1497. POSIX fnmatch.
  1498. config UCLIBC_HAS_FNMATCH_OLD
  1499. bool "Use the older (stable) fnmatch code"
  1500. depends on UCLIBC_HAS_FNMATCH
  1501. default y
  1502. help
  1503. There are two versions of fnmatch. The older (stable) version has
  1504. been in uClibc for quite a long time but hasn't seen too many
  1505. updates. It also has some known issues when dealing with uncommon
  1506. corner cases and multibyte/unicode strings. However, it is quite
  1507. a bit smaller than the newer version.
  1508. If the older version has worked for you and you don't need unicode
  1509. support, then stick with the old version (and say Y here).
  1510. Otherwise, you should use the new version (and say N here).
  1511. config UCLIBC_HAS_WORDEXP
  1512. bool "Support the wordexp() interface"
  1513. depends on UCLIBC_HAS_GLOB
  1514. default n
  1515. help
  1516. The SuSv3 wordexp() interface performs word expansions per the Shell
  1517. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1518. intended for use by applications that want to implement all of the
  1519. standard Bourne shell expansions on input data.
  1520. This interface is rarely used, and very large. Unless you have a
  1521. pressing need for wordexp(), you should probably answer N.
  1522. config UCLIBC_HAS_NFTW
  1523. bool "Support the nftw() interface"
  1524. default n
  1525. help
  1526. The SuSv3 nftw() interface is used to recursively descend
  1527. directory paths while repeatedly calling a function.
  1528. This interface is rarely used, and adds around 4.5k. Unless you have
  1529. a pressing need for nftw(), you should probably answer N.
  1530. config UCLIBC_HAS_FTW
  1531. bool "Support the ftw() interface"
  1532. default n
  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_GLOB
  1540. bool "Support the glob() interface"
  1541. depends on UCLIBC_HAS_FNMATCH
  1542. default y
  1543. help
  1544. The glob interface is somewhat large (weighing in at about 2,5k). It
  1545. is used fairly often, but is an option since people wanting to go for
  1546. absolute minimum size may wish to omit it.
  1547. Most people will answer Y.
  1548. config UCLIBC_HAS_GNU_GLOB
  1549. bool "Support gnu glob() interface"
  1550. depends on UCLIBC_HAS_GLOB
  1551. default n
  1552. help
  1553. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1554. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1555. from glibc and does not support all the GNU specific options.
  1556. Answer Y if you want to include full gnu glob() instead of the smaller
  1557. SUSv3 compatible glob().
  1558. Most people will answer N.
  1559. endmenu
  1560. menu "Library Installation Options"
  1561. config RUNTIME_PREFIX
  1562. string "uClibc runtime library directory"
  1563. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1564. help
  1565. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1566. libraries will be installed. The result will look something
  1567. like the following:
  1568. $(RUNTIME_PREFIX)/
  1569. lib/ <contains all runtime libraries>
  1570. usr/bin/ldd <the ldd utility program>
  1571. sbin/ldconfig <the ldconfig utility program>
  1572. This value is used by the 'make install' Makefile target. Since this
  1573. directory is compiled into the shared library loader, you will need to
  1574. recompile uClibc if you change this value...
  1575. For a typical target system this should be set to "/", such that
  1576. 'make install' will install /lib/libuClibc-<VERSION>.so
  1577. config DEVEL_PREFIX
  1578. string "uClibc development environment directory"
  1579. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1580. help
  1581. DEVEL_PREFIX is the directory into which the uClibc development
  1582. environment will be installed. The result will look something
  1583. like the following:
  1584. $(DEVEL_PREFIX)/
  1585. lib/ <contains static libs>
  1586. include/ <Where all the header files go>
  1587. This value is used by the 'make install' Makefile target when
  1588. installing a uClibc development environment.
  1589. For a typical target system this should be set to "/usr", such that
  1590. 'make install' will install /usr/include/<header files>.
  1591. config MULTILIB_DIR
  1592. string "library path component"
  1593. default "lib"
  1594. help
  1595. Path component where libraries reside.
  1596. For a typical target system this should be set to "lib", such that
  1597. 'make install' will install libraries to "/lib" and "/usr/lib"
  1598. respectively
  1599. DEVEL_PREFIX/MULTILIB_DIR
  1600. RUNTIME_PREFIX/MULTILIB_DIR
  1601. Other settings may include "lib32" or "lib64".
  1602. config HARDWIRED_ABSPATH
  1603. bool "Hardwire absolute paths into linker scripts"
  1604. default y
  1605. help
  1606. This prepends absolute paths to the libraries mentioned in linker
  1607. scripts such as libc.so.
  1608. This is a build time optimization. It has no impact on dynamic
  1609. linking at runtime, which doesn't use linker scripts.
  1610. You must disable this to use uClibc with old non-sysroot toolchains,
  1611. such as the prebuilt binary cross compilers at:
  1612. http://uclibc.org/downloads/binaries
  1613. The amount of time saved by this optimization is actually too small to
  1614. measure. The linker just had to search the library path to find the
  1615. linker script, so the dentries are cache hot if it has to search the
  1616. same path again. But it's what glibc does, so we do it too.
  1617. endmenu
  1618. menu "Security options"
  1619. config UCLIBC_BUILD_PIE
  1620. bool "Build utilities as ET_DYN/PIE executables"
  1621. depends on HAVE_SHARED
  1622. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
  1623. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1624. default n
  1625. help
  1626. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1627. executables.
  1628. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1629. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1630. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1631. all libraries have to be built with -fPIC or -fpic, and all
  1632. assembler functions must be written as position independent
  1633. code (PIC).
  1634. config UCLIBC_HAS_ARC4RANDOM
  1635. bool "Include the arc4random() function"
  1636. default n
  1637. help
  1638. Answer Y to support the OpenBSD-like arc4random() function. This
  1639. function picks a random number between 0 and N, and will always return
  1640. something even if the random driver is dead. If urandom fails then
  1641. gettimeofday(2) will be used as the random seed. This function is
  1642. designed to be more dependable than invoking /dev/urandom directly.
  1643. OpenSSL and OpenNTPD currently support this function.
  1644. Most people will answer N.
  1645. config HAVE_NO_SSP
  1646. bool
  1647. default n
  1648. config UCLIBC_HAS_SSP
  1649. bool "Support for GCC stack smashing protector"
  1650. depends on !HAVE_NO_SSP
  1651. default n
  1652. help
  1653. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1654. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1655. the needed functions are added to ldso/libc instead.
  1656. GCC's stack protector is a reimplementation of IBM's propolice.
  1657. See http://www.trl.ibm.com/projects/security/ssp/ and
  1658. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1659. for details.
  1660. Note that NOEXECSTACK on a kernel with address space randomization
  1661. is generally sufficient to prevent most buffer overflow exploits
  1662. without increasing code size. This option essentially adds debugging
  1663. code to catch them.
  1664. Most people will answer N.
  1665. config UCLIBC_HAS_SSP_COMPAT
  1666. bool "Support for gcc-3.x propolice smashing stack protector"
  1667. depends on UCLIBC_HAS_SSP
  1668. default n
  1669. help
  1670. Add gcc-3.x propolice smashing stack protector to the library.
  1671. This requires a patched version of GCC, supporting the
  1672. -fstack-protector[-all] options, with the __guard and
  1673. __stack_smash_handler functions removed from libgcc.
  1674. These functions are added to ldso/libc instead.
  1675. More information at:
  1676. <http://www.research.ibm.com/trl/projects/security/ssp/>
  1677. Most people will answer N.
  1678. config SSP_QUICK_CANARY
  1679. bool "Use simple guard values without accessing /dev/urandom"
  1680. depends on UCLIBC_HAS_SSP
  1681. default n
  1682. help
  1683. Use gettimeofday(2) to define the __guard without accessing
  1684. /dev/urandom.
  1685. WARNING: This makes smashing stack protector vulnerable to timing
  1686. attacks.
  1687. Most people will answer N.
  1688. choice
  1689. prompt "Propolice protection blocking signal"
  1690. depends on UCLIBC_HAS_SSP
  1691. default PROPOLICE_BLOCK_ABRT if ! DODEBUG
  1692. default PROPOLICE_BLOCK_SEGV if DODEBUG
  1693. help
  1694. "abort" use SIGABRT to block offending programs.
  1695. This is the default implementation.
  1696. "segfault" use SIGSEGV to block offending programs.
  1697. Use this for debugging.
  1698. If unsure, answer "abort".
  1699. config PROPOLICE_BLOCK_ABRT
  1700. bool "abort"
  1701. config PROPOLICE_BLOCK_SEGV
  1702. bool "segfault"
  1703. endchoice
  1704. config UCLIBC_BUILD_SSP
  1705. bool "Build uClibc with -fstack-protector"
  1706. depends on UCLIBC_HAS_SSP
  1707. default n
  1708. help
  1709. Build all uClibc libraries and executables with -fstack-protector,
  1710. adding extra stack overflow checking to most uClibc functions.
  1711. config UCLIBC_BUILD_RELRO
  1712. bool "Build uClibc with linker option -z RELRO"
  1713. depends on HAVE_SHARED
  1714. default y
  1715. help
  1716. Build all libraries and executables with "ld -z relro".
  1717. This tells the linker to mark chunks of an executable or shared
  1718. library read-only after applying dynamic relocations. (This comes
  1719. up when a global const variable is initialized to the address of a
  1720. function or the value of another global variable.)
  1721. This is a fairly obscure option the ld man page doesn't even bother
  1722. to document properly. It's a security paranoia issue that's more
  1723. likely to consume memory (by allocating an extra page) rather than
  1724. save it.
  1725. This is explained in more depth at
  1726. http://www.airs.com/blog/archives/189
  1727. Nobody is likely to care whether you say Y or N here.
  1728. config UCLIBC_BUILD_NOW
  1729. bool "Build uClibc with linker option -z NOW"
  1730. depends on HAVE_SHARED
  1731. default n
  1732. help
  1733. Build all libraries and executables with "ld -z now".
  1734. This tells the linker to resolve all symbols when the library is
  1735. first loaded, rather than when each function is first called. This
  1736. increases start-up latency by a few microseconds and may do
  1737. unnecessary work (resolving symbols that are never used), but the
  1738. realtime people like it for making microbenchmark timings slightly
  1739. more predictable and in some cases it can be slightly faster due to
  1740. CPU cache behavior (not having to fault the linker back in to do
  1741. lazy symbol resolution).
  1742. Most people can't tell the difference between selecting Y or N here.
  1743. config UCLIBC_BUILD_NOEXECSTACK
  1744. bool "Build uClibc with noexecstack marking"
  1745. default y
  1746. help
  1747. Mark all assembler files as noexecstack, which will mark uClibc
  1748. as not requiring an executable stack. (This doesn't prevent other
  1749. files you link against from claiming to need an executable stack, it
  1750. just won't cause uClibc to request it unnecessarily.)
  1751. This is a security thing to make buffer overflows harder to exploit.
  1752. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1753. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1754. It only actually provides any security when combined with address
  1755. space randomization, explained here: http://lwn.net/Articles/121845/
  1756. Address space randomization is on by default in current linux
  1757. kernels (although it can be disabled using the option
  1758. CONFIG_COMPAT_BRK).
  1759. You should probably say Y.
  1760. endmenu
  1761. menu "uClibc development/debugging options"
  1762. config CROSS_COMPILER_PREFIX
  1763. string "Cross-compiling toolchain prefix"
  1764. default ""
  1765. help
  1766. The prefix used to execute your cross-compiling toolchain. For
  1767. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1768. then enter 'arm-linux-uclibc-' here.
  1769. config UCLIBC_EXTRA_CFLAGS
  1770. string "Enter any extra CFLAGS to use to build uClibc"
  1771. default ""
  1772. help
  1773. Add any additional CFLAGS to be used to build uClibc.
  1774. config DODEBUG
  1775. bool "Build uClibc with debugging symbols"
  1776. default n
  1777. select EXTRA_WARNINGS
  1778. help
  1779. Say Y here if you wish to compile uClibc with debugging symbols.
  1780. This will allow you to use a debugger to examine uClibc internals
  1781. while applications are running. This increases the size of the
  1782. library considerably and should only be used when doing development.
  1783. If you are doing development and want to debug uClibc, answer Y.
  1784. Otherwise, answer N.
  1785. config DODEBUG_PT
  1786. bool "Build pthread with debugging output"
  1787. depends on UCLIBC_HAS_THREADS && LINUXTHREADS_OLD
  1788. default n
  1789. help
  1790. Enable debug output in libpthread. This is only useful when doing
  1791. development in libpthread itself.
  1792. Otherwise, answer N.
  1793. config DOSTRIP
  1794. bool "Strip libraries and executables"
  1795. default y
  1796. depends on !DODEBUG
  1797. help
  1798. Say Y here if you do wish to strip all uClibc libraries and
  1799. executables. No stripping increases the size of the binaries
  1800. considerably, but makes it possible to debug uClibc libraries.
  1801. Most people will answer Y.
  1802. config DOASSERTS
  1803. bool "Build uClibc with run-time assertion testing"
  1804. default n
  1805. help
  1806. Say Y here to include runtime assertion tests.
  1807. This enables runtime assertion testing in some code, which can
  1808. increase the size of the library and incur runtime overhead.
  1809. If you say N, then this testing will be disabled.
  1810. config SUPPORT_LD_DEBUG
  1811. bool "Build the shared library loader with debugging support"
  1812. depends on HAVE_SHARED
  1813. default n
  1814. help
  1815. Answer Y here to enable all the extra code needed to debug the uClibc
  1816. native shared library loader. The level of debugging noise that is
  1817. generated depends on the LD_DEBUG environment variable... Just set
  1818. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1819. debug your application. Diagnostic messages will then be printed to
  1820. the stderr.
  1821. For now these debugging tokens are available:
  1822. detail provide more information for some options
  1823. move display copy processing
  1824. symbols display symbol table processing
  1825. reloc display relocation processing; detail shows the
  1826. relocation patch
  1827. nofixups never fixes up jump relocations
  1828. bindings displays the resolve processing (function calls);
  1829. detail shows the relocation patch
  1830. all Enable everything!
  1831. The additional environment variable:
  1832. LD_DEBUG_OUTPUT=file
  1833. redirects the diagnostics to an output file created using
  1834. the specified name and the process id as a suffix.
  1835. An excellent start is simply:
  1836. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1837. or to log everything to a file named 'logfile', try this
  1838. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1839. If you are doing development and want to debug uClibc's shared library
  1840. loader, answer Y. Mere mortals answer N.
  1841. config SUPPORT_LD_DEBUG_EARLY
  1842. bool "Build the shared library loader with early debugging support"
  1843. depends on HAVE_SHARED
  1844. default n
  1845. help
  1846. Answer Y here to if you find the uClibc shared library loader is
  1847. crashing or otherwise not working very early on. This is typical
  1848. only when starting a new port when you haven't figured out how to
  1849. properly get the values for argc, argv, environ, etc. This method
  1850. allows a degree of visibility into the very early shared library
  1851. loader initialization process. If you are doing development and want
  1852. to debug the uClibc shared library loader early initialization,
  1853. answer Y. Mere mortals answer N.
  1854. config UCLIBC_MALLOC_DEBUGGING
  1855. bool "Build malloc with debugging support"
  1856. depends on MALLOC || MALLOC_STANDARD
  1857. default n
  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 WARNINGS
  1873. string "Compiler Warnings"
  1874. default "-Wall"
  1875. help
  1876. Set this to the set of gcc warnings you wish to see while compiling.
  1877. config EXTRA_WARNINGS
  1878. bool "Enable extra annoying warnings"
  1879. default n
  1880. help
  1881. If you wish to build with extra warnings enabled, say Y here.
  1882. config DOMULTI
  1883. bool "Compile all sources at once into an object"
  1884. default n
  1885. help
  1886. Set this to compile all sources at once into an object (IMA).
  1887. This mode of compilation uses alot of memory but may produce
  1888. smaller binaries.
  1889. Note that you need a very recent GCC for this to work, like
  1890. gcc >= 4.3 plus eventually some patches.
  1891. If unsure, keep the default of N.
  1892. config UCLIBC_MJN3_ONLY
  1893. bool "Manuel's hidden warnings"
  1894. default n
  1895. help
  1896. Answer Y here to see all Manuel's personal notes, warnings, and todos.
  1897. Most people will answer N.
  1898. endmenu