Config.in 78 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-ng $VERSION C Library Configuration"
  6. config DESIRED_TARGET_ARCH
  7. string
  8. option env="ARCH"
  9. config VERSION
  10. string
  11. option env="VERSION"
  12. choice
  13. prompt "Target Architecture"
  14. default TARGET_alpha if DESIRED_TARGET_ARCH = "alpha"
  15. default TARGET_arc if DESIRED_TARGET_ARCH = "arc"
  16. default TARGET_arm if DESIRED_TARGET_ARCH = "arm"
  17. default TARGET_avr32 if DESIRED_TARGET_ARCH = "avr32"
  18. default TARGET_bfin if DESIRED_TARGET_ARCH = "bfin"
  19. default TARGET_cris if DESIRED_TARGET_ARCH = "cris"
  20. default TARGET_frv if DESIRED_TARGET_ARCH = "frv"
  21. default TARGET_h8300 if DESIRED_TARGET_ARCH = "h8300"
  22. default TARGET_hppa if DESIRED_TARGET_ARCH = "hppa"
  23. default TARGET_i386 if DESIRED_TARGET_ARCH = "i386"
  24. default TARGET_ia64 if DESIRED_TARGET_ARCH = "ia64"
  25. default TARGET_lm32 if DESIRED_TARGET_ARCH = "lm32"
  26. default TARGET_m68k if DESIRED_TARGET_ARCH = "m68k"
  27. default TARGET_metag if DESIRED_TARGET_ARCH = "metag"
  28. default TARGET_microblaze if DESIRED_TARGET_ARCH = "microblaze"
  29. default TARGET_mips if DESIRED_TARGET_ARCH = "mips"
  30. default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
  31. default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
  32. default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
  33. default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
  34. default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
  35. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  36. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  37. help
  38. The architecture of your target.
  39. config TARGET_alpha
  40. bool "alpha"
  41. config TARGET_arc
  42. bool "arc"
  43. config TARGET_arm
  44. bool "arm"
  45. config TARGET_avr32
  46. bool "avr32"
  47. config TARGET_bfin
  48. bool "bfin"
  49. # someone could sync this tree:
  50. # http://linux-c6x.org/git/?p=uClibc.git;a=summary
  51. config TARGET_c6x
  52. bool "c6x"
  53. config TARGET_cris
  54. bool "cris"
  55. #config TARGET_frv
  56. # bool "frv (BROKEN)"
  57. config TARGET_h8300
  58. bool "h8300"
  59. #config TARGET_hppa
  60. # bool "hppa"
  61. config TARGET_i386
  62. bool "i386"
  63. config TARGET_ia64
  64. bool "ia64"
  65. config TARGET_lm32
  66. bool "lm32"
  67. config TARGET_m68k
  68. bool "m68k"
  69. config TARGET_metag
  70. bool "metag"
  71. config TARGET_microblaze
  72. bool "microblaze"
  73. config TARGET_mips
  74. bool "mips"
  75. config TARGET_nios2
  76. bool "nios2"
  77. config TARGET_or1k
  78. bool "or1k"
  79. config TARGET_powerpc
  80. bool "powerpc"
  81. config TARGET_sh
  82. bool "superh"
  83. config TARGET_sparc
  84. bool "sparc"
  85. config TARGET_x86_64
  86. bool "x86_64"
  87. config TARGET_xtensa
  88. bool "xtensa"
  89. endchoice
  90. menu "Target Architecture Features and Options"
  91. if TARGET_alpha
  92. source "extra/Configs/Config.alpha"
  93. endif
  94. if TARGET_arm
  95. source "extra/Configs/Config.arm"
  96. endif
  97. if TARGET_avr32
  98. source "extra/Configs/Config.avr32"
  99. endif
  100. if TARGET_bfin
  101. source "extra/Configs/Config.bfin"
  102. endif
  103. if TARGET_cris
  104. source "extra/Configs/Config.cris"
  105. endif
  106. if TARGET_frv
  107. source "extra/Configs/Config.frv"
  108. endif
  109. if TARGET_h8300
  110. source "extra/Configs/Config.h8300"
  111. endif
  112. if TARGET_hppa
  113. source "extra/Configs/Config.hppa"
  114. endif
  115. if TARGET_i386
  116. source "extra/Configs/Config.i386"
  117. endif
  118. if TARGET_ia64
  119. source "extra/Configs/Config.ia64"
  120. endif
  121. if TARGET_lm32
  122. source "extra/Configs/Config.lm32"
  123. endif
  124. if TARGET_m68k
  125. source "extra/Configs/Config.m68k"
  126. endif
  127. if TARGET_metag
  128. source "extra/Configs/Config.metag"
  129. endif
  130. if TARGET_nios2
  131. source "extra/Configs/Config.nios2"
  132. endif
  133. if TARGET_microblaze
  134. source "extra/Configs/Config.microblaze"
  135. endif
  136. if TARGET_mips
  137. source "extra/Configs/Config.mips"
  138. endif
  139. if TARGET_or1k
  140. source "extra/Configs/Config.or1k"
  141. endif
  142. if TARGET_powerpc
  143. source "extra/Configs/Config.powerpc"
  144. endif
  145. if TARGET_sh
  146. source "extra/Configs/Config.sh"
  147. endif
  148. if TARGET_sparc
  149. source "extra/Configs/Config.sparc"
  150. endif
  151. if TARGET_x86_64
  152. source "extra/Configs/Config.x86_64"
  153. endif
  154. if TARGET_xtensa
  155. source "extra/Configs/Config.xtensa"
  156. endif
  157. if TARGET_c6x
  158. source "extra/Configs/Config.c6x"
  159. endif
  160. if TARGET_arc
  161. source "extra/Configs/Config.arc"
  162. endif
  163. config TARGET_SUBARCH
  164. string
  165. default "e500" if CONFIG_E500
  166. default "classic" if CONFIG_CLASSIC
  167. default "sh4" if CONFIG_SH4
  168. default "sh4" if CONFIG_SH4A
  169. default "" if CONFIG_386
  170. default "i486" if CONFIG_486
  171. default "i586" if CONFIG_586
  172. default "i686" if CONFIG_686
  173. default "arcv2" if CONFIG_ARC_CPU_HS
  174. default ""
  175. source "extra/Configs/Config.in.arch"
  176. endmenu
  177. menu "General Library Settings"
  178. config HAVE_NO_PIC
  179. bool
  180. config DOPIC
  181. bool "Generate only Position Independent Code (PIC)"
  182. default y
  183. depends on !HAVE_NO_PIC
  184. help
  185. If you wish to build all of uClibc as PIC objects, then answer Y here.
  186. If you are unsure, then you should answer N.
  187. config ARCH_HAS_NO_SHARED
  188. bool
  189. config ARCH_HAS_NO_LDSO
  190. bool
  191. select ARCH_HAS_NO_SHARED
  192. config ARCH_HAS_UCONTEXT
  193. bool
  194. config HAVE_SHARED
  195. bool "Enable shared libraries"
  196. depends on !ARCH_HAS_NO_SHARED
  197. default y
  198. help
  199. If you wish to build uClibc with support for shared libraries then
  200. answer Y here. If you only want to build uClibc as a static library,
  201. then answer N.
  202. config FORCE_SHAREABLE_TEXT_SEGMENTS
  203. bool "Only load shared libraries which can share their text segment"
  204. depends on HAVE_SHARED
  205. select DOPIC
  206. help
  207. If you answer Y here, the uClibc native shared library loader will
  208. only load shared libraries, which do not need to modify any
  209. non-writable segments. These libraries haven't set the DT_TEXTREL
  210. tag in the dynamic section (==> objdump).
  211. All your libraries must be compiled with -fPIC or -fpic, and all
  212. assembler function must be written as position independent code (PIC).
  213. Enabling this option will make uClibc's shared library loader a
  214. little bit smaller and guarantee that no memory will be wasted by
  215. badly coded shared libraries.
  216. config LDSO_LDD_SUPPORT
  217. bool "Native 'ldd' support"
  218. depends on HAVE_SHARED
  219. default y
  220. help
  221. Enable all the code needed to support traditional ldd,
  222. which executes the shared library loader to resolve all dependencies
  223. and then provide a list of shared libraries that are required for an
  224. application to function. Disabling this option will make uClibc's
  225. shared library loader a little bit smaller.
  226. Most people will answer Y.
  227. config LDSO_CACHE_SUPPORT
  228. bool "Enable library loader cache (ld.so.conf)"
  229. depends on HAVE_SHARED
  230. default y
  231. help
  232. Enable this to make use of /etc/ld.so.conf, the shared library loader
  233. cache configuration file to support for non-standard library paths.
  234. After updating this file, it is necessary to run 'ldconfig' to update
  235. the /etc/ld.so.cache shared library loader cache file.
  236. config LDSO_PRELOAD_ENV_SUPPORT
  237. bool "Enable library loader LD_PRELOAD environment"
  238. depends on HAVE_SHARED
  239. default y
  240. help
  241. Enable this to make use of LD_PRELOAD environment variable.
  242. A whitespace-separated list of additional, user-specified, ELF shared
  243. libraries to be loaded before all others. This can be used to
  244. selectively override functions in other shared libraries. For
  245. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  246. search directories that are also set-user-ID will be loaded.
  247. config LDSO_PRELOAD_FILE_SUPPORT
  248. bool "Enable library loader preload file (ld.so.preload)"
  249. depends on HAVE_SHARED
  250. help
  251. Enable this to make use of /etc/ld.so.preload. This file contains a
  252. whitespace separated list of shared libraries to be loaded before
  253. the program.
  254. config LDSO_BASE_FILENAME
  255. string "Shared library loader naming prefix"
  256. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  257. default "ld.so"
  258. help
  259. If you wish to support both uClibc and glibc on the same system, it
  260. is necessary to set this to something other than "ld.so" to avoid
  261. conflicts with glibc, which also uses "ld.so". This prevents both
  262. libraries from using the same /etc/ld.so.* files. If you wish to
  263. support both uClibc and glibc on the same system then you should set
  264. this to "ld-uClibc.so".
  265. Most people will leave this set to the default of "ld.so".
  266. WARNING: Changing the default prefix could cause problems with
  267. binutils' ld !
  268. config LDSO_STANDALONE_SUPPORT
  269. bool "Dynamic linker stand-alone mode support"
  270. depends on HAVE_SHARED
  271. help
  272. The dynamic linker can be run either indirectly through running some
  273. dynamically linked program or library (in which case no command line
  274. options to the dynamic linker can be passed and, in the ELF case, the
  275. dynamic linker which is stored in the .interp section of the program
  276. is executed) or directly by running:
  277. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  278. Stand-alone execution is a prerequisite for adding prelink
  279. capabilities to uClibc dynamic linker, as well useful for testing an
  280. updated version of the dynamic linker without breaking the system.
  281. config LDSO_PRELINK_SUPPORT
  282. bool "Dynamic linker prelink support"
  283. depends on HAVE_SHARED
  284. select LDSO_STANDALONE_SUPPORT
  285. help
  286. The dynamic linker can be used in stand-alone mode by the prelink tool
  287. for prelinking ELF shared libraries and binaries to speed up startup
  288. time. It also is able to load and handle prelinked libraries and
  289. binaries at runtime.
  290. config UCLIBC_STATIC_LDCONFIG
  291. bool "Link ldconfig statically"
  292. depends on HAVE_SHARED
  293. default y
  294. help
  295. Enable this option to statically link the ldconfig binary.
  296. Making ldconfig static can be beneficial if you have a library
  297. problem and need to use ldconfig to recover. Sometimes it is
  298. preferable to instead keep the size of the system down, in which
  299. case you should disable this option.
  300. config LDSO_RUNPATH
  301. bool "Enable ELF RUNPATH tag support"
  302. depends on HAVE_SHARED
  303. default y if LDSO_CACHE_SUPPORT
  304. help
  305. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  306. which extend the library search paths. They are really only useful
  307. if a package installs libraries in non standard locations and
  308. ld.so.conf support is disabled.
  309. Usage of RUNPATH tags is not too common, so disabling this feature
  310. should be safe for most people.
  311. config LDSO_RUNPATH_OF_EXECUTABLE
  312. bool "Use executables RUNPATH/RPATH when searching for libraries."
  313. depends on LDSO_RUNPATH
  314. default n
  315. help
  316. Use the executables RUNPATH/RPATH to find to find libraries even
  317. though this behavour is not standard. Setting this option causes
  318. the uclibc dynamic linker behavour to match the glibc dynamic linker.
  319. config LDSO_SAFE_RUNPATH
  320. bool "Allow only RUNPATH beginning with /"
  321. depends on LDSO_RUNPATH
  322. default y
  323. help
  324. Allow only absolute path in RPATH/RUNPATH.
  325. config LDSO_SEARCH_INTERP_PATH
  326. bool "Add ldso path to lib search path"
  327. depends on HAVE_SHARED
  328. default y
  329. help
  330. The ldso is told where it is being executed from and can use that
  331. path to find related core libraries. This is useful by default,
  332. but can be annoying in a mixed development environment.
  333. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  334. library search with /foo/boo/
  335. If unsure, simply say Y here.
  336. config LDSO_LD_LIBRARY_PATH
  337. bool "Add LD_LIBRARY_PATH to lib search path"
  338. depends on HAVE_SHARED
  339. default y
  340. help
  341. On hardened system it could be useful to disable the use of
  342. LD_LIBRARY_PATH environment variable (a colon-separated list of
  343. directories in which to search for ELF libraries at execution-time).
  344. If unsure, simply say Y here.
  345. config LDSO_NO_CLEANUP
  346. bool "Disable automatic unloading of dynamically loaded shared objects"
  347. depends on HAVE_SHARED
  348. help
  349. If you need complete allocation traces when debugging memory leaks
  350. using Valgrind in a process that dynamically loads shared objects,
  351. then answer Y here. Unlike glibc, uClibc unloads all dynamically
  352. loaded shared objects when a process exits, which prevents Valgrind
  353. from correctly resolving the symbols from the unloaded shared objects.
  354. Unless you know you need this, you should answer N.
  355. config UCLIBC_CTOR_DTOR
  356. bool
  357. default y
  358. help
  359. If you wish to build uClibc with support for global constructor
  360. (ctor) and global destructor (dtor) support, then answer Y here.
  361. When ctor/dtor support is enabled, binaries linked with uClibc must
  362. also be linked with crtbegin.o and crtend.o which are provided by gcc
  363. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  364. may need to be adjusted to include these files). This support will
  365. also add a small amount of additional size to each binary compiled vs
  366. uClibc. If you will be using uClibc with C++, or if you need the gcc
  367. __attribute__((constructor)) and __attribute__((destructor)) to work,
  368. then you definitely want to answer Y here. If you don't need ctors
  369. or dtors and want your binaries to be as small as possible, then
  370. answer N.
  371. config LDSO_GNU_HASH_SUPPORT
  372. bool "Enable GNU hash style support"
  373. depends on HAVE_SHARED
  374. help
  375. Newest binutils support a new hash style named GNU-hash. The dynamic
  376. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  377. if present into the ELF binaries, otherwise it will use the old SysV
  378. hash style (.hash). This ensures that it is completely backward
  379. compatible.
  380. Further, being the hash table implementation self-contained into each
  381. executable and shared libraries, objects with mixed hash style can
  382. peacefully coexist in the same process.
  383. If you want to use this new feature, answer Y
  384. choice
  385. prompt "Thread support"
  386. #default UCLIBC_HAS_THREADS_NATIVE if (TARGET_alpha || TARGET_arm || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_sh || TARGET_sh64)
  387. default HAS_NO_THREADS
  388. help
  389. If you want to compile uClibc with pthread support, then answer Y.
  390. This will increase the size of uClibc by adding a bunch of locking
  391. to critical data structures, and adding extra code to ensure that
  392. functions are properly reentrant.
  393. config HAS_NO_THREADS
  394. bool "none"
  395. help
  396. Disable thread support.
  397. config LINUXTHREADS_OLD
  398. bool "older (stable) version of linuxthreads"
  399. # linuxthreads and linuxthreads.old need nanosleep()
  400. select UCLIBC_HAS_REALTIME
  401. depends on !TARGET_arc && \
  402. !TARGET_arm && \
  403. !TARGET_i386 && \
  404. !TARGET_metag && \
  405. !TARGET_mips && \
  406. !TARGET_powerpc && \
  407. !TARGET_sparc && \
  408. !TARGET_x86_64 && \
  409. !TARGET_xtensa || \
  410. !ARCH_USE_MMU
  411. help
  412. There are two versions of linuxthreads. The older (stable) version
  413. has been in uClibc for quite a long time but hasn't seen too many
  414. updates other than bugfixes.
  415. config LINUXTHREADS_NEW
  416. bool "slightly newer version of linuxthreads"
  417. depends on ARCH_HAS_DEPRECATED_SYSCALLS
  418. depends on !TARGET_arc && \
  419. !TARGET_arm && \
  420. !TARGET_i386 && \
  421. !TARGET_metag && \
  422. !TARGET_mips && \
  423. !TARGET_powerpc && \
  424. !TARGET_sh && \
  425. !TARGET_sparc && \
  426. !TARGET_x86_64 && \
  427. !TARGET_xtensa || \
  428. !ARCH_USE_MMU
  429. help
  430. The new version has not been tested much, and lacks ports for arches
  431. which glibc does not support (like bfin/frv/etc...), but is based on
  432. the latest code from glibc, so it may be the only choice for the
  433. newer ports (like alpha/amd64/64bit arches and hppa).
  434. config UCLIBC_HAS_THREADS_NATIVE
  435. bool "Native POSIX Threading (NPTL)"
  436. select UCLIBC_HAS_TLS
  437. select UCLIBC_HAS_STDIO_FUTEXES
  438. select UCLIBC_HAS_REALTIME
  439. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  440. depends on !CONFIG_386 && \
  441. !TARGET_alpha && \
  442. !TARGET_avr32 && \
  443. !TARGET_bfin && \
  444. !TARGET_c6x && \
  445. !TARGET_cris && \
  446. !TARGET_h8300 && \
  447. !TARGET_hppa && \
  448. !TARGET_ia64 && \
  449. !TARGET_m68k && \
  450. !TARGET_microblaze && \
  451. !TARGET_nios2 && \
  452. !TARGET_or1k && \
  453. ARCH_USE_MMU
  454. help
  455. If you want to compile uClibc with NPTL support, then answer Y.
  456. endchoice
  457. config UCLIBC_HAS_THREADS
  458. def_bool y if !HAS_NO_THREADS
  459. config UCLIBC_HAS_TLS
  460. bool "Thread-Local Storage"
  461. depends on UCLIBC_HAS_THREADS_NATIVE
  462. help
  463. If you want to enable TLS support then answer Y.
  464. This is fast an efficient way to store per-thread local data
  465. which is not on stack. It needs __thread support enabled in
  466. gcc.
  467. config PTHREADS_DEBUG_SUPPORT
  468. bool "Build pthreads debugging support"
  469. depends on UCLIBC_HAS_THREADS
  470. help
  471. Say Y here if you wish to be able to debug applications that use
  472. uClibc's pthreads library. By enabling this option, a library
  473. named libthread_db will be built. This library will be dlopen()'d
  474. by gdb and will allow gdb to debug the threads in your application.
  475. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  476. you must compile gdb with uClibc in order for pthread debugging to
  477. work properly.
  478. If you are doing development and want to debug applications using
  479. uClibc's pthread library, answer Y. Otherwise, answer N.
  480. config UCLIBC_HAS_SYSLOG
  481. bool "Syslog support"
  482. default y
  483. depends on UCLIBC_HAS_NETWORK_SUPPORT
  484. select UCLIBC_HAS_SOCKET
  485. help
  486. Support sending messages to the system logger.
  487. This requires socket-support.
  488. config UCLIBC_HAS_LFS
  489. bool "Large File Support"
  490. default y
  491. help
  492. If you wish to build uClibc with support for accessing large files
  493. (i.e. files greater then 2 GiB) then answer Y. Do not enable this
  494. if you are using an older Linux kernel (2.0.x) that lacks large file
  495. support. Enabling this option will increase the size of uClibc.
  496. choice
  497. prompt "Malloc Implementation"
  498. default MALLOC if ! ARCH_USE_MMU
  499. default MALLOC_STANDARD if ARCH_USE_MMU
  500. config MALLOC
  501. bool "malloc"
  502. help
  503. "malloc" use mmap for all allocations and so works very well on
  504. MMU-less systems that do not support the brk() system call. It is
  505. pretty smart about reusing already allocated memory, and minimizing
  506. memory wastage.
  507. This is the default for uClinux MMU-less systems.
  508. config MALLOC_SIMPLE
  509. bool "malloc-simple"
  510. help
  511. "malloc-simple" is trivially simple and slow as molasses. It
  512. was written from scratch for uClibc, and is the simplest possible
  513. (and therefore smallest) malloc implementation.
  514. This uses only the mmap() system call to allocate and free memory,
  515. and does not use the brk() system call at all, making it a fine
  516. choice for MMU-less systems with very limited memory. It's 100%
  517. standards compliant, thread safe, very small, and releases freed
  518. memory back to the OS immediately rather than keeping it in the
  519. process's heap for reallocation. It is also VERY SLOW.
  520. config MALLOC_STANDARD
  521. bool "malloc-standard"
  522. depends on ARCH_USE_MMU
  523. help
  524. "malloc-standard" is derived from the public domain dlmalloc
  525. implementation by Doug Lea. It is quite fast, and is pretty smart
  526. about reusing already allocated memory, and minimizing memory
  527. wastage. This uses brk() for small allocations, while using mmap()
  528. for larger allocations. This is the default malloc implementation
  529. for uClibc.
  530. If unsure, answer "malloc-standard".
  531. endchoice
  532. config MALLOC_GLIBC_COMPAT
  533. bool "Malloc returns live pointer for malloc(0)"
  534. help
  535. The behavior of malloc(0) is listed as implementation-defined by
  536. SuSv3. Glibc returns a valid pointer to something, while uClibc
  537. normally returns NULL. I personally feel glibc's behavior is
  538. not particularly safe, and allows buggy applications to hide very
  539. serious problems.
  540. When this option is enabled, uClibc will act just like glibc, and
  541. return a live pointer when someone calls malloc(0). This pointer
  542. provides a malloc'ed area with a size of 1 byte. This feature is
  543. mostly useful when dealing with applications using autoconf's broken
  544. AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
  545. does not detect glibc style returning-a-valid-pointer-for-malloc(0)
  546. behavior). Most people can safely answer N.
  547. config UCLIBC_HAS_OBSTACK
  548. bool "Obstack Support (gnu extension)"
  549. help
  550. When this option is enabled, uClibc will provide support for obstacks.
  551. An obstack is a structure in which memory can be dynamically allocated
  552. as a 'stack of objects'. Many programs need this GNU extention and
  553. you should say Y if you are using any. Otherwise, say N to save some
  554. space.
  555. config UCLIBC_DYNAMIC_ATEXIT
  556. bool "Dynamic atexit() Support"
  557. default y
  558. help
  559. When this option is enabled, uClibc will support an infinite number,
  560. of atexit() and on_exit() functions, limited only by your available
  561. memory. This can be important when uClibc is used with C++, since
  562. global destructors are implemented via atexit(), and it is quite
  563. possible to exceed the default number when this option is disabled.
  564. Enabling this option adds a few bytes, and more significantly makes
  565. atexit and on_exit depend on malloc, which can be bad when compiling
  566. static executables.
  567. Unless you use uClibc with C++, you should probably answer N.
  568. config COMPAT_ATEXIT
  569. bool "Old (visible) atexit Support"
  570. help
  571. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  572. else you will be missing atexit() until you rebuild all apps.
  573. config UCLIBC_HAS_UTMPX
  574. bool "utmpx based support for tracking login/logouts to/from the system"
  575. help
  576. Answer y to enable support for accessing user accounting database.
  577. It can be used to track all login/logout to the system.
  578. config UCLIBC_HAS_UTMP
  579. bool "utmp support (XPG2 compat, SVr4 compat)"
  580. depends on UCLIBC_HAS_UTMPX
  581. help
  582. Answer y to enable legacy SVID support for accessing
  583. user accounting database:
  584. getutent(), getutid(), getutline(), pututline(),
  585. setutent(), endutent(), utmpname() in utmp.h
  586. It can be used to track all login/logout to the system.
  587. If unsure, answer N and use corresponding POSIX functions
  588. from utmpx.h
  589. config UCLIBC_SUSV2_LEGACY
  590. bool "Enable SuSv2 LEGACY functions"
  591. help
  592. Enable this option if you want to have SuSv2 LEGACY functions
  593. Currently applies to:
  594. valloc
  595. WARNING! ABI incompatibility.
  596. config UCLIBC_SUSV3_LEGACY
  597. bool "Enable SuSv3 LEGACY functions"
  598. #vfork,
  599. # h_errno
  600. # gethostbyaddr
  601. # gethostbyname
  602. help
  603. Enable this option if you want to have SuSv3 LEGACY functions
  604. in the library, else they are replaced by SuSv3 proposed macros.
  605. Currently applies to:
  606. bcmp, bcopy, bzero, index, rindex, ftime,
  607. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  608. (getwd), (makecontext),
  609. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  610. scalb, (setcontext), (swapcontext), ualarm, usleep,
  611. wcswcs.
  612. WARNING! ABI incompatibility.
  613. config UCLIBC_HAS_CONTEXT_FUNCS
  614. bool "Use obsolescent context control functions"
  615. depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
  616. help
  617. Add into library the SuSv3 obsolescent functions used for context
  618. control. The setcontext family allows the implementation in C of
  619. advanced control flow patterns such as iterators, fibers, and
  620. coroutines. They may be viewed as an advanced version of
  621. setjmp/longjmp; whereas the latter allows only a single non-local jump
  622. up the stack, setcontext allows the creation of multiple cooperative
  623. threads of control, each with its own stack.
  624. These functions are: setcontext, getcontext, makecontext, swapcontext.
  625. config UCLIBC_SUSV3_LEGACY_MACROS
  626. bool "Enable SuSv3 LEGACY macros"
  627. help
  628. Enable this option if you want to have SuSv3 LEGACY macros.
  629. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  630. WARNING! ABI incompatibility.
  631. config UCLIBC_SUSV4_LEGACY
  632. bool "Enable SuSv4 LEGACY or obsolescent functions"
  633. help
  634. Enable this option if you want to have SuSv4 LEGACY functions
  635. and macros in the library.
  636. Currently applies to:
  637. - XSI functions:
  638. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  639. gettimeofday, isascii, pthread_getconcurrency,
  640. pthread_setconcurrency, setitimer, setpgrp, sighold,
  641. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  642. tempnam, toascii, ulimit.
  643. - Base functions:
  644. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  645. tmpnam, utime.
  646. WARNING! ABI incompatibility.
  647. config UCLIBC_STRICT_HEADERS
  648. bool "Hide structures and constants for unsupported features"
  649. help
  650. Hide structures and constants in headers that should not be used,
  651. because the respective feature is disabled.
  652. WARNING! enabling this option requires to patch many faulty apps,
  653. since they make (wrongly) use of these structures/constants,
  654. although the feature was disabled.
  655. config UCLIBC_HAS_STUBS
  656. bool "Provide stubs for unavailable functionality"
  657. help
  658. With this option uClibc provides non-functional stubs for
  659. functions which are impossible to implement on the target
  660. architecture. Otherwise, such functions are simply omitted.
  661. config UCLIBC_HAS_SHADOW
  662. bool "Shadow Password Support"
  663. default y
  664. help
  665. Answer N if you do not need shadow password support.
  666. Most people will answer Y.
  667. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  668. bool "Support for program_invocation_name"
  669. help
  670. Support for the GNU-specific program_invocation_name and
  671. program_invocation_short_name strings. Some GNU packages
  672. (like tar and coreutils) utilize these for extra useful
  673. output, but in general are not required.
  674. At startup, these external strings are automatically set
  675. up based on the value of ARGV[0].
  676. If unsure, just answer N.
  677. config UCLIBC_HAS___PROGNAME
  678. bool "Support for __progname"
  679. default y
  680. help
  681. Some packages (like openssh) like to peek into internal libc
  682. symbols to make their output a bit more user friendly.
  683. At startup, __progname is automatically set up based on the
  684. value of ARGV[0].
  685. If unsure, just answer N.
  686. config UCLIBC_HAS_PTY
  687. bool "Support for pseudo-terminals"
  688. default y
  689. help
  690. This enables support for pseudo-terminals (see man 4 pts
  691. and man 7 pty).
  692. If unsure, just answer Y.
  693. config ASSUME_DEVPTS
  694. bool "Assume that /dev/pts is a devpts or devfs file system"
  695. default y
  696. depends on UCLIBC_HAS_PTY
  697. help
  698. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  699. these filesystems automatically manage permissions on the /dev/pts
  700. devices. You may need to mount your devpts or devfs filesystem on
  701. /dev/pts for this to work.
  702. Most people should answer Y.
  703. config UNIX98PTY_ONLY
  704. bool "Support only Unix 98 PTYs"
  705. default y
  706. depends on UCLIBC_HAS_PTY
  707. help
  708. If you want to support only Unix 98 PTYs enable this. Some older
  709. applications may need this disabled and will thus use legacy BSD
  710. style PTY handling which is more complex and also bigger than
  711. Unix 98 PTY handling.
  712. For most current programs, you can generally answer Y.
  713. if UNIX98PTY_ONLY
  714. config UCLIBC_HAS_GETPT
  715. bool "Support getpt() (glibc-compat)"
  716. depends on UCLIBC_HAS_PTY
  717. help
  718. Some packages may need getpt().
  719. All of those are non-standard and can be considered
  720. GNU/libc compatibility.
  721. Either use posix_openpt() or just open /dev/ptmx yourself.
  722. If unsure, just say N.
  723. endif
  724. if !UNIX98PTY_ONLY
  725. # Have to use __libc_ptyname{1,2}[] and related bloat
  726. config UCLIBC_HAS_GETPT
  727. def_bool y
  728. endif
  729. config UCLIBC_HAS_LIBUTIL
  730. bool "Provide libutil library and functions"
  731. depends on UCLIBC_HAS_PTY
  732. help
  733. Provide a libutil library.
  734. This non-standard conforming library provides the following
  735. utility functions:
  736. forkpty(): combines openpty(), fork(2), and login_tty() to
  737. create a new process operating in a pseudo-terminal.
  738. login(): write utmp and wtmp entries
  739. login_tty(): prepares for a login on the tty fd by creating a
  740. new session, making fd the controlling terminal for
  741. the calling process, setting fd to be the standard
  742. input, output, and error streams of the current
  743. process, and closing fd.
  744. logout(): write utmp and wtmp entries
  745. logwtmp(): constructs a utmp structure and calls updwtmp() to
  746. append the structure to the utmp file.
  747. openpty(): finds an available pseudo-terminal and returns
  748. file descriptors for the master and slave
  749. This library adds about 3k-4k to your system.
  750. config UCLIBC_HAS_TM_EXTENSIONS
  751. bool "Support 'struct tm' timezone extension fields"
  752. default y
  753. help
  754. Enabling this option adds fields to 'struct tm' in time.h for
  755. tracking the number of seconds east of UTC, and an abbreviation for
  756. the current timezone. These fields are not specified by the SuSv3
  757. standard, but they are commonly used in both GNU and BSD application
  758. code.
  759. To strictly follow the SuSv3 standard, leave this disabled.
  760. Most people will probably want to answer Y.
  761. config UCLIBC_HAS_TZ_CACHING
  762. bool "Enable caching of the last valid timezone 'TZ' string"
  763. default y
  764. help
  765. Answer Y to enable caching of the last valid 'TZ' string describing
  766. the timezone setting. This allows a quick string compare to avoid
  767. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  768. Most people will answer Y.
  769. config UCLIBC_HAS_TZ_FILE
  770. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  771. default y
  772. help
  773. Answer Y to enable the setting of a default timezone for uClibc.
  774. Ordinarily, uClibc gets the timezone information exclusively from the
  775. 'TZ' environment variable. In particular, there is no support for
  776. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  777. With this option enabled, uClibc will use the value stored in the
  778. file '/etc/TZ' (default path) to obtain timezone information if the
  779. 'TZ' environment variable is missing or has an invalid value. The
  780. file consists of a single line (newline required) of text describing
  781. the timezone in the format specified for the TZ environment variable.
  782. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  783. See
  784. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  785. for details on valid settings of 'TZ'.
  786. Most people will answer Y.
  787. config UCLIBC_HAS_TZ_FILE_READ_MANY
  788. bool "Repeatedly read the '/etc/TZ' file"
  789. depends on UCLIBC_HAS_TZ_FILE
  790. default y
  791. help
  792. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  793. a valid value has been read. This incurs the overhead of an
  794. open/read/close for each tzset() call (explicit or implied). However,
  795. setting this will allow applications to update their timezone
  796. information if the contents of the file change.
  797. Most people will answer Y.
  798. config UCLIBC_TZ_FILE_PATH
  799. string "Path to the 'TZ' file for setting the global timezone"
  800. depends on UCLIBC_HAS_TZ_FILE
  801. default "/etc/TZ"
  802. help
  803. This is the path to the 'TZ' file.
  804. Most people will use the default of '/etc/TZ'.
  805. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  806. bool "Use /etc/localtime as a fallback"
  807. depends on UCLIBC_HAS_TZ_FILE
  808. default y
  809. help
  810. Answer Y to try to use /etc/localtime file.
  811. On glibc systems this file (if it is in TZif2 format)
  812. contains timezone string at the end.
  813. Most people will answer Y.
  814. endmenu
  815. menu "Advanced Library Settings"
  816. config UCLIBC_PWD_BUFFER_SIZE
  817. int "Buffer size for getpwnam() and friends"
  818. default 256
  819. range 12 1024
  820. help
  821. This sets the value of the buffer size for getpwnam() and friends.
  822. By default, this is 256. (For reference, glibc uses 1024).
  823. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  824. parameter.
  825. config UCLIBC_GRP_BUFFER_SIZE
  826. int "Buffer size for getgrnam() and friends"
  827. default 256
  828. range 12 1024
  829. help
  830. This sets the value of the buffer size for getgrnam() and friends.
  831. By default, this is 256. (For reference, glibc uses 1024).
  832. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  833. parameter.
  834. comment "Support various families of functions"
  835. config UCLIBC_LINUX_MODULE_26
  836. bool "Linux kernel module functions (2.6)"
  837. default y
  838. help
  839. delete_module, init_module
  840. are used in linux for loadable kernel modules.
  841. Say N if you do not use kernel modules.
  842. config UCLIBC_LINUX_MODULE_24
  843. bool "Linux kernel module functions (<2.6)"
  844. depends on !TARGET_bfin && !TARGET_c6x
  845. help
  846. create_module, query_module
  847. are used in linux (prior to 2.6) for loadable kernel modules.
  848. Say N if you do not use kernel modules, or you only support
  849. Linux 2.6+.
  850. config UCLIBC_LINUX_SPECIFIC
  851. bool "Linux specific functions"
  852. default y
  853. help
  854. accept4(), bdflush(),
  855. capget(), capset(), eventfd(), fallocate(),
  856. fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
  857. madvise(), modify_ldt(), pipe2(), personality(),
  858. prctl()/arch_prctl(), pivot_root(), modify_ldt(),
  859. ppoll(), readahead(), reboot(), remap_file_pages(),
  860. sched_getaffinity(), sched_setaffinity(), sendfile(),
  861. setfsgid(), setfsuid(), setresgid(), setresuid(),
  862. splice(), vmsplice(), tee(), signalfd(), statfs(),
  863. swapoff(), swapon(), sync_file_range(), _sysctl(),
  864. sysinfo(), timerfd_*(), vhangup(), umount(), umount2()
  865. config UCLIBC_HAS_GNU_ERROR
  866. bool "Support GNU extensions for error-reporting"
  867. default y
  868. help
  869. Support for the GNU-specific error(), error_at_line(),
  870. void (* error_print_progname)(), error_message_count
  871. functions and variables. Some GNU packages
  872. utilize these for extra useful output, but in general
  873. are not required.
  874. If unsure, just answer N.
  875. config UCLIBC_BSD_SPECIFIC
  876. bool "BSD specific functions"
  877. default y
  878. help
  879. mincore(), getdomainname(), setdomainname()
  880. If unsure, say N.
  881. config UCLIBC_HAS_BSD_ERR
  882. bool "BSD err functions"
  883. default y
  884. help
  885. These functions are non-standard BSD extensions.
  886. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  887. If unsure, say N.
  888. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  889. bool "BSD obsolete signal functions"
  890. help
  891. These functions are provided as a compatibility interface for
  892. programs that make use of the historical System V signal API.
  893. This API is obsolete:
  894. new applications should use the POSIX signal API (sigaction(2),
  895. sigprocmask(2), etc.).
  896. Affected functions:
  897. sigset(), sighold(), sigrelse(), sigignore()
  898. If unsure, say N.
  899. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  900. bool "SYSV obsolete signal functions"
  901. help
  902. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  903. If unsure, say N.
  904. config UCLIBC_NTP_LEGACY
  905. bool "ntp_*() aliases"
  906. help
  907. Provide legacy aliases for ntp functions:
  908. ntp_adjtime(), ntp_gettime()
  909. It is safe to say N here.
  910. config UCLIBC_SV4_DEPRECATED
  911. bool "Enable SVr4 deprecated functions"
  912. help
  913. These functions are DEPRECATED in System V release 4.
  914. Say N unless you desparately need one of the functions below:
  915. ustat() [use statfs(2) in your code instead]
  916. config UCLIBC_HAS_REALTIME
  917. bool "Realtime-related family of SUSv functions"
  918. default y
  919. help
  920. These functions are part of the Timers option and need not
  921. be available on all implementations.
  922. Includes AIO, message-queue, scheduler, semaphore functions:
  923. aio.h
  924. mqueue.h
  925. sched.h
  926. semaphore.h
  927. aio_cancel()
  928. aio_error()
  929. aio_fsync()
  930. aio_read()
  931. lio_listio()
  932. aio_return()
  933. aio_suspend()
  934. aio_write()
  935. clock_getres(), clock_gettime(), clock_settime()
  936. fdatasync()
  937. mlockall(), munlockall()
  938. mlock(), munlock()
  939. mq_close()
  940. mq_getattr()
  941. mq_notify()
  942. mq_open()
  943. mq_receive()
  944. mq_send()
  945. mq_setattr()
  946. mq_unlink()
  947. nanosleep()
  948. sched_getparam()
  949. sched_get_priority_max(), sched_get_priority_min()
  950. sched_getscheduler()
  951. sched_rr_get_interval()
  952. sched_setparam()
  953. sched_setscheduler()
  954. sem_close()
  955. sem_destroy()
  956. sem_getvalue()
  957. sem_init()
  958. sem_open()
  959. sem_post()
  960. sem_trywait(), sem_wait()
  961. sem_unlink()
  962. sigqueue()
  963. sigtimedwait(), sigwaitinfo()
  964. timer_create()
  965. timer_delete()
  966. timer_getoverrun(), timer_gettime(), timer_settime()
  967. config UCLIBC_HAS_ADVANCED_REALTIME
  968. bool "Advanced realtime-related family of SUSv functions"
  969. default y
  970. depends on UCLIBC_HAS_REALTIME
  971. help
  972. These functions are part of the Timers option and need not
  973. be available on all implementations.
  974. clock_getcpuclockid()
  975. clock_nanosleep()
  976. mq_timedreceive()
  977. mq_timedsend()
  978. posix_fadvise()
  979. posix_fallocate()
  980. posix_madvise()
  981. posix_memalign()
  982. posix_mem_offset()
  983. posix_spawnattr_destroy(), posix_spawnattr_init()
  984. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  985. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  986. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  987. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  988. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  989. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  990. posix_spawn_file_actions_addclose()
  991. posix_spawn_file_actions_adddup2()
  992. posix_spawn_file_actions_addopen()
  993. posix_spawn_file_actions_destroy()
  994. posix_spawn_file_actions_init()
  995. posix_spawn()
  996. posix_spawnp()
  997. posix_typed_mem_get_info()
  998. pthread_mutex_timedlock()
  999. sem_timedwait()
  1000. #config UCLIBC_HAS_TERMIOS
  1001. # bool "termios functions"
  1002. # default y
  1003. # help
  1004. # Get and set terminal attributes, line control, get and set baud
  1005. # rate.
  1006. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  1007. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  1008. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  1009. #
  1010. # If unsure, say Y.
  1011. config UCLIBC_HAS_EPOLL
  1012. bool "epoll"
  1013. default y
  1014. help
  1015. epoll_create(), epoll_ctl(), epoll_wait() functions.
  1016. config UCLIBC_HAS_XATTR
  1017. bool "Extended Attributes"
  1018. default y
  1019. help
  1020. Extended Attributes support.
  1021. setxattr()
  1022. lsetxattr()
  1023. fsetxattr()
  1024. getxattr()
  1025. lgetxattr()
  1026. fgetxattr()
  1027. listxattr()
  1028. llistxattr()
  1029. flistxattr()
  1030. removexattr()
  1031. lremovexattr()
  1032. fremovexattr()
  1033. Say N unless you need support for extended attributes and the
  1034. filesystems do actually support them.
  1035. config UCLIBC_HAS_PROFILING
  1036. bool "Profiling support"
  1037. default y
  1038. help
  1039. gcc's -finstrument-functions needs these.
  1040. Most people can safely answer N.
  1041. config UCLIBC_HAS_CRYPT_IMPL
  1042. bool "libcrypt support"
  1043. default y
  1044. help
  1045. libcrypt contains crypt(), setkey() and encrypt()
  1046. config UCLIBC_HAS_SHA256_CRYPT_IMPL
  1047. bool "libcrypt SHA256 support"
  1048. depends on UCLIBC_HAS_CRYPT_IMPL
  1049. help
  1050. This adds support for SHA256 password hashing via the crypt() function.
  1051. Say N here if you do not need SHA256 crypt support.
  1052. config UCLIBC_HAS_SHA512_CRYPT_IMPL
  1053. bool "libcrypt SHA512 support"
  1054. depends on UCLIBC_HAS_CRYPT_IMPL
  1055. help
  1056. This adds support for SHA512 password hashing via the crypt() function.
  1057. Say N here if you do not need SHA512 crypt support.
  1058. config UCLIBC_HAS_CRYPT_STUB
  1059. bool "libcrypt stubs"
  1060. default y
  1061. depends on !UCLIBC_HAS_CRYPT_IMPL
  1062. help
  1063. Standards mandate that crypt(3) provides a stub if it is unavailable.
  1064. If you enable this option then stubs for
  1065. crypt(), setkey() and encrypt()
  1066. will be provided in a small libcrypt.
  1067. config UCLIBC_HAS_CRYPT
  1068. def_bool y
  1069. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  1070. endmenu
  1071. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  1072. bool "Networking Support"
  1073. default y
  1074. help
  1075. Say N here if you do not need network support.
  1076. if UCLIBC_HAS_NETWORK_SUPPORT
  1077. config UCLIBC_HAS_SOCKET
  1078. bool "Socket support"
  1079. default y
  1080. help
  1081. If you want to include support for sockets then answer Y.
  1082. config UCLIBC_HAS_IPV4
  1083. bool "IP version 4 support"
  1084. default y
  1085. select UCLIBC_HAS_SOCKET
  1086. help
  1087. If you want to include support for the Internet Protocol
  1088. (IP version 4) then answer Y.
  1089. Most people will say Y.
  1090. config UCLIBC_HAS_IPV6
  1091. bool "IP version 6 support"
  1092. select UCLIBC_HAS_SOCKET
  1093. help
  1094. If you want to include support for the next version of the Internet
  1095. Protocol (IP version 6) then answer Y.
  1096. Most people should answer N.
  1097. config UCLIBC_HAS_RPC
  1098. bool "Remote Procedure Call (RPC) support"
  1099. # RPC+socket-ipvX doesn't currently work.
  1100. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1101. help
  1102. If you want to include RPC support, enable this. RPC is rarely used
  1103. for anything except for the NFS filesystem. Unless you plan to use
  1104. NFS, you can probably leave this set to N and save some space.
  1105. If you need to use NFS then you should answer Y.
  1106. config UCLIBC_HAS_FULL_RPC
  1107. bool "Full RPC support"
  1108. depends on UCLIBC_HAS_RPC
  1109. default y if !HAVE_SHARED
  1110. help
  1111. Normally we enable just enough RPC support for things like rshd and
  1112. nfs mounts to work. If you find you need the rest of the RPC stuff,
  1113. then enable this option. Most people can safely answer N.
  1114. config UCLIBC_HAS_REENTRANT_RPC
  1115. bool "Reentrant RPC support"
  1116. depends on UCLIBC_HAS_RPC
  1117. default y if !HAVE_SHARED
  1118. help
  1119. Most packages utilize the normal (non-reentrant) RPC functions, but
  1120. some (like exportfs from nfs-utils) need these reentrant versions.
  1121. Most people can safely answer N.
  1122. config UCLIBC_USE_NETLINK
  1123. bool "Use netlink to query interfaces"
  1124. depends on UCLIBC_HAS_SOCKET
  1125. help
  1126. In newer versions of Linux (2.4.17+), support was added for querying
  1127. network device information via netlink rather than the old style
  1128. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1129. it is smaller than netlink), but if you find that not all of your
  1130. devices are being returned by the if_nameindex() function, you will
  1131. have to use the netlink implementation.
  1132. Most people can safely answer N.
  1133. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1134. bool "Support the AI_ADDRCONFIG flag"
  1135. depends on UCLIBC_USE_NETLINK
  1136. help
  1137. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1138. implementation using netlink to query interfaces to find both
  1139. ipv4 and ipv6 support. This is only needed if an application uses
  1140. the AI_ADDRCONFIG flag.
  1141. Most people can safely answer N.
  1142. config UCLIBC_HAS_BSD_RES_CLOSE
  1143. bool "Support res_close() (bsd-compat)"
  1144. help
  1145. Answer Y if you desperately want to support BSD compatibility in
  1146. the network code.
  1147. Most people will say N.
  1148. config UCLIBC_HAS_COMPAT_RES_STATE
  1149. bool "Use compatible but bloated _res"
  1150. default y
  1151. help
  1152. Answer Y if you build network utilities and they muck with resolver
  1153. internals a lot (_res global structure). uclibc does not use most
  1154. of _res.XXX fields, and with this option OFF they won't even exist.
  1155. Which will make e.g. dig build fail.
  1156. Answering N saves around 400 bytes in bss.
  1157. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1158. bool "Use extra compatible but extra bloated _res"
  1159. help
  1160. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1161. As far as I can say, this should never be needed.
  1162. config UCLIBC_HAS_RESOLVER_SUPPORT
  1163. bool "DNS resolver functions"
  1164. select UCLIBC_HAS_COMPAT_RES_STATE
  1165. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1166. help
  1167. Provide implementations for DNS resolver functions.
  1168. In particular, the following functions will be added to the
  1169. library:
  1170. ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
  1171. res_mkquery, res_init, res_ninit, res_close, res_nclose
  1172. res_query, res_search, res_querydomain,
  1173. dn_expand, dn_comp,
  1174. ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
  1175. ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
  1176. ns_get16, ns_get32, ns_put16, ns_put32
  1177. config UCLIBC_HAS_LIBRESOLV_STUB
  1178. bool "Provide libresolv stub"
  1179. help
  1180. Provide a dummy resolv library.
  1181. config UCLIBC_HAS_LIBNSL_STUB
  1182. bool "Provide libnsl stub"
  1183. help
  1184. Provide a dummy nsl library.
  1185. endif
  1186. menu "String and Stdio Support"
  1187. config UCLIBC_HAS_STRING_GENERIC_OPT
  1188. bool "Use faster (but larger) generic string functions"
  1189. default y
  1190. help
  1191. Answer Y to use the (tweaked) glibc generic string functions.
  1192. In general, they are faster (but 3-5K larger) than the base
  1193. uClibc string functions which are optimized solely for size.
  1194. Many people will answer Y.
  1195. config UCLIBC_HAS_STRING_ARCH_OPT
  1196. bool "Use arch-specific assembly string functions (where available)"
  1197. default y
  1198. help
  1199. Answer Y to use any archtecture-specific assembly language string
  1200. functions available for this target plaform.
  1201. Note that assembly implementations are not available for all string
  1202. functions, so some generic (written in C) string functions may
  1203. still be used.
  1204. These are small and fast, the only reason _not_ to say Y here is
  1205. for debugging purposes.
  1206. config UCLIBC_HAS_STDIO_FUTEXES
  1207. bool "Use futexes for multithreaded I/O locking"
  1208. depends on UCLIBC_HAS_THREADS_NATIVE
  1209. help
  1210. If you want to compile uClibc to use futexes for low-level
  1211. I/O locking, answer Y. Otherwise, answer N.
  1212. config UCLIBC_HAS_CTYPE_TABLES
  1213. bool "Use Table Versions Of 'ctype.h' Functions."
  1214. default y
  1215. help
  1216. Answer Y to use table versions of the 'ctype.h' functions.
  1217. While the non-table versions are often smaller when building
  1218. statically linked apps, they work only in stub locale mode.
  1219. Most people will answer Y.
  1220. config UCLIBC_HAS_CTYPE_SIGNED
  1221. bool "Support Signed Characters In 'ctype.h' Functions."
  1222. depends on UCLIBC_HAS_CTYPE_TABLES
  1223. default y
  1224. help
  1225. Answer Y to enable support for passing signed char values to
  1226. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1227. these functions are only defined for unsigned char values and
  1228. EOF. However, glibc allows negative signed char values as well
  1229. in order to support 'broken old programs'.
  1230. Most people will answer Y.
  1231. choice
  1232. prompt "ctype argument checking"
  1233. depends on UCLIBC_HAS_CTYPE_TABLES
  1234. default UCLIBC_HAS_CTYPE_UNSAFE
  1235. help
  1236. Please select the invalid arg behavior you want for the 'ctype'
  1237. functions.
  1238. The 'ctype' functions are now implemented using table lookups, with
  1239. the arg being the index. This can result in incorrect memory accesses
  1240. or even segfaults for args outside of the allowed range.
  1241. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1242. the macro implementations.
  1243. config UCLIBC_HAS_CTYPE_UNSAFE
  1244. bool "Do not check -- unsafe"
  1245. config UCLIBC_HAS_CTYPE_CHECKED
  1246. bool "Detect and handle appropriately"
  1247. config UCLIBC_HAS_CTYPE_ENFORCED
  1248. bool "Issue a diagnostic and abort()"
  1249. endchoice
  1250. config UCLIBC_HAS_WCHAR
  1251. bool "Wide Character Support"
  1252. help
  1253. Answer Y to enable wide character support. This will make uClibc
  1254. much larger. It is also currently required for locale support.
  1255. Most people will answer N.
  1256. config UCLIBC_HAS_LOCALE
  1257. bool "Locale Support"
  1258. select UCLIBC_HAS_WCHAR
  1259. select UCLIBC_HAS_CTYPE_TABLES
  1260. help
  1261. uClibc now has full ANSI/ISO C99 locale support (except for
  1262. wcsftime() and collating items in regex). Be aware that enabling
  1263. this option will make uClibc much larger.
  1264. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1265. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1266. uClibc by around 300k. You can reduce this size by building your own
  1267. custom set of locate data (see extra/locale/LOCALES for details).
  1268. uClibc's locale support is still under development. For example,
  1269. codesets using shift states are not currently supported. Support is
  1270. planned in the next iteration of locale support.
  1271. Answer Y to enable locale support. Most people will answer N.
  1272. choice
  1273. prompt "Locale data"
  1274. depends on UCLIBC_HAS_LOCALE
  1275. default UCLIBC_BUILD_ALL_LOCALE
  1276. config UCLIBC_BUILD_ALL_LOCALE
  1277. bool "All locales"
  1278. depends on UCLIBC_HAS_LOCALE
  1279. help
  1280. This builds all the locales that are available on your
  1281. host-box.
  1282. config UCLIBC_BUILD_MINIMAL_LOCALE
  1283. bool "Only selected locales"
  1284. depends on UCLIBC_HAS_LOCALE
  1285. help
  1286. If you do not need all locales that are available on your
  1287. host-box, then set this to 'Y'.
  1288. config UCLIBC_PREGENERATED_LOCALE_DATA
  1289. bool "Use Pre-generated Locale Data"
  1290. depends on UCLIBC_HAS_LOCALE && !TARGET_metag
  1291. help
  1292. Use pre-built locale data.
  1293. Note that these pregenerated locales are sensitive to your
  1294. target architecture (endianess, bitcount).
  1295. Saying N here is highly recommended.
  1296. endchoice
  1297. config UCLIBC_BUILD_MINIMAL_LOCALES
  1298. string "locales to use"
  1299. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1300. default "en_US"
  1301. help
  1302. Space separated list of locales to use.
  1303. E.g.:
  1304. en_US en_GB de_AT
  1305. default:
  1306. en_US
  1307. config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
  1308. bool "Automagically Download the Pre-generated Locale Data (if necessary)"
  1309. depends on UCLIBC_PREGENERATED_LOCALE_DATA
  1310. help
  1311. If you would like the build process to use 'wget' to automatically
  1312. download the pregenerated locale data, enable this option. Otherwise
  1313. you will need to obtain the locale data yourself from:
  1314. http://www.uclibc.org/downloads/uClibc-locale-*.tgz
  1315. and place the uClibc-locale-*.tgz tarball in the extra/locale/
  1316. directory.
  1317. Note that the use of pregenerated locale data is discouraged.
  1318. config UCLIBC_HAS_XLOCALE
  1319. bool "Extended Locale Support (experimental/incomplete)"
  1320. depends on UCLIBC_HAS_LOCALE
  1321. help
  1322. Answer Y to enable extended locale support similar to that provided
  1323. by glibc. This is primarily intended to support libstd++
  1324. functionality.
  1325. However, it also allows thread-specific locale selection via
  1326. uselocale().
  1327. Most people will answer N.
  1328. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1329. bool "Support hexadecimal float notation"
  1330. depends on UCLIBC_HAS_CTYPE_TABLES
  1331. depends on UCLIBC_HAS_FLOATS
  1332. help
  1333. Answer Y to enable support for hexadecimal float notation in the
  1334. (wchar and) char string to floating point conversion functions, as
  1335. well as support for the %a and %A conversion specifiers in the
  1336. *printf() and *scanf() functions.
  1337. Most people will answer N.
  1338. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1339. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1340. depends on UCLIBC_HAS_LOCALE
  1341. depends on UCLIBC_HAS_FLOATS
  1342. help
  1343. Answer Y to enable support for glibc's \"'\" flag for allowing
  1344. locale-specific digit grouping in base 10 integer conversions and
  1345. appropriate floating point conversions in the *printf() and *scanf()
  1346. functions.
  1347. Most people will answer N.
  1348. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1349. bool "Do not require digit grouping when the \"'\" flag is specified"
  1350. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1351. default y
  1352. help
  1353. Answer Y to make digit grouping optional when the \"'\" flag is
  1354. specified.
  1355. This is the standard glibc behavior. If the initial string of digits
  1356. exceeds the maximum group number, the input will be treated as a
  1357. normal non-grouped number.
  1358. Most people will answer N.
  1359. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1360. bool "Support glibc's register_printf_function() (glibc-compat)"
  1361. depends on !USE_OLD_VFPRINTF
  1362. help
  1363. Answer Y to support glibc's register_printf_function() to allow an
  1364. application to add its own printf conversion specifiers.
  1365. parse_printf_format() is also enabled.
  1366. NOTE: Limits the number or registered specifiers to 10.
  1367. NOTE: Requires new conversion specifiers to be ASCII
  1368. characters (0-0x7f). This is to avoid problems with processing
  1369. format strings in locales with different multibyte conversions.
  1370. Most people will answer N.
  1371. config USE_OLD_VFPRINTF
  1372. bool "Use the old vfprintf implementation"
  1373. depends on !UCLIBC_HAS_WCHAR
  1374. help
  1375. Set to true to use the old vfprintf instead of the new. This is
  1376. roughly C89 compliant with some extensions, and is much smaller.
  1377. However, it does not support wide chars, positional args, or glibc
  1378. custom printf specifiers.
  1379. Most people will answer N.
  1380. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1381. int "Maximum number of positional args. Either 0 or >= 9."
  1382. depends on !USE_OLD_VFPRINTF
  1383. default 9
  1384. help
  1385. Set the maximum number of positional args supported by the
  1386. printf/scanf functions. The Single Unix Specification Version 3
  1387. requires a minimum value of 9. Setting this to a value lower than
  1388. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1389. in limits.h to be #undef'd.
  1390. WARNING! The workspace to support positional args is currently
  1391. allocated on the stack. You probably don't want to set
  1392. this to too high a value.
  1393. Most people will answer 9.
  1394. choice
  1395. prompt "Stdio buffer size"
  1396. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1397. help
  1398. Please select a value for BUFSIZ. This will be used by the
  1399. stdio subsystem as the default buffer size for a file, and
  1400. affects fopen(), setvbuf(), etc.
  1401. NOTE: Setting this to 'none' will disable buffering completely.
  1402. However, BUFSIZ will still be defined in stdio.h as 256 because
  1403. many applications use this value.
  1404. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1405. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1406. depends on !UCLIBC_HAS_WCHAR
  1407. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1408. bool "256 (minimum ANSI/ISO C99 value)"
  1409. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1410. bool "512"
  1411. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1412. bool "1024"
  1413. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1414. bool "2048"
  1415. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1416. bool "4096"
  1417. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1418. bool "8192"
  1419. # If you add more choices, you will need to update uClibc_stdio.h.
  1420. endchoice
  1421. choice
  1422. prompt "Stdio builtin buffer size (uClibc-specific)"
  1423. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1424. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1425. help
  1426. When a FILE is created with fopen(), an attempt is made to allocate
  1427. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1428. succeed but the FILE will be unbuffered.
  1429. This option adds a small amount of space to each FILE to act as an
  1430. emergency buffer in the event of a buffer allocation failure.
  1431. Most people will answer None.
  1432. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1433. bool "None"
  1434. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1435. bool "4"
  1436. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1437. bool "8"
  1438. # If you add more choices, you will need to update uClibc_stdio.h.
  1439. endchoice
  1440. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1441. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1442. help
  1443. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1444. a behavioral change made in SUSv3. Previously, abort() was required
  1445. to have the affect of fclose() on all open streams. The wording has
  1446. been changed to "may" from "shall".
  1447. Most people will answer N.
  1448. config UCLIBC_HAS_STDIO_GETC_MACRO
  1449. bool "Provide a macro version of getc()"
  1450. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1451. default y
  1452. help
  1453. Provide a macro version of getc().
  1454. Most people will answer Y.
  1455. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1456. bool "Provide a macro version of putc()"
  1457. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1458. default y
  1459. help
  1460. Provide a macro version of putc().
  1461. Most people will answer Y.
  1462. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1463. bool "Support auto-r/w transition"
  1464. default y
  1465. help
  1466. Answer Y to enable the stdio subsystem to automaticly transition
  1467. between reading and writing. This relaxes the ANSI/ISO C99
  1468. requirement:
  1469. When a file is opened with update mode ('+' as the second or third
  1470. character in the list of mode argument values), both input and output
  1471. may be performed on the associated stream. However, output shall not
  1472. be directly followed by input without an intervening call to the
  1473. fflush function or to a file positioning function (fseek, fsetpos,
  1474. or rewind), and input shall not be directly followed by output without
  1475. an intervening call to a file positioning function, unless the input
  1476. operation encounters end­of­file.
  1477. Most people will answer Y.
  1478. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1479. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1480. depends on UCLIBC_HAS_LFS
  1481. help
  1482. Answer Y to enable a uClibc-specific extension to allow passing an
  1483. additional 'F' flag in the mode string for fopen() to specify that
  1484. the file should be open()ed with the O_LARGEFILE flag set.
  1485. Most people will answer N.
  1486. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1487. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1488. help
  1489. Answer Y to support a glibc extension to allow passing
  1490. additional 'x' flag in the mode string for fopen() to specify that
  1491. the file should be open()ed with the O_EXCL flag set.
  1492. Most people will answer N.
  1493. config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
  1494. bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
  1495. help
  1496. Answer Y to support a glibc extension to allow passing
  1497. additional 'e' flag in the mode string for fopen() to specify that
  1498. the file should be open()ed with the O_CLOEXEC flag set.
  1499. Most people will answer N.
  1500. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1501. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1502. help
  1503. Answer Y to support the glibc 'custom stream' extension functions
  1504. fmemopen(), open_memstream(), and fopencookie().
  1505. NOTE: There are some minor differences regarding seeking behavior.
  1506. Most people will answer N.
  1507. config UCLIBC_HAS_PRINTF_M_SPEC
  1508. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1509. help
  1510. Answer Y to support a glibc extension to interpret '%m' in printf
  1511. format strings as an instruction to output the error message string
  1512. (as generated by strerror) corresponding to the current value of
  1513. 'errno'.
  1514. Most people will answer N.
  1515. config UCLIBC_HAS_ERRNO_MESSAGES
  1516. bool "Include the errno message text in the library"
  1517. default y
  1518. help
  1519. Answer Y if you want to include the errno message text in the
  1520. library. This adds about 3K to the library, but enables strerror()
  1521. to generate text other than 'Unknown error <number>'.
  1522. Most people will answer Y.
  1523. config UCLIBC_HAS_SYS_ERRLIST
  1524. bool "Support sys_errlist[] (obsolete-compat)"
  1525. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1526. help
  1527. Answer Y if you want to support the obsolete sys_errlist[].
  1528. This adds about 0.5k to the library, except for the mips
  1529. arch where it adds over 4K.
  1530. WARNING! In the future, support for sys_errlist[] may be unavailable
  1531. in at least some configurations. In fact, it may be removed
  1532. altogether.
  1533. Most people will answer N.
  1534. Application writers: use the strerror(3) function.
  1535. config UCLIBC_HAS_SIGNUM_MESSAGES
  1536. bool "Include the signum message text in the library"
  1537. default y
  1538. help
  1539. Answer Y if you want to include the signum message text in the
  1540. library. This adds about 0.5K to the library, but enables strsignal()
  1541. to generate text other than 'Unknown signal <number>'.
  1542. Most people will answer Y.
  1543. config UCLIBC_HAS_SYS_SIGLIST
  1544. bool "Support sys_siglist[] (bsd-compat)"
  1545. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1546. help
  1547. Answer Y if you want to support sys_siglist[].
  1548. WARNING! In the future, support for sys_siglist[] may be unavailable
  1549. in at least some configurations. In fact, it may be removed
  1550. altogether.
  1551. Most people will answer N.
  1552. config UCLIBC_HAS_GETTEXT_AWARENESS
  1553. bool "Include gettext awareness"
  1554. depends on UCLIBC_HAS_LOCALE && UCLIBC_MJN3_ONLY
  1555. help
  1556. NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
  1557. Answer Y if you want to include weak stub gettext support and
  1558. make the *strerror*() and strsignal() functions gettext-aware.
  1559. Currently, to get functional gettext functionality you will need
  1560. to use gnu gettext.
  1561. Most people will answer N.
  1562. config UCLIBC_HAS_GNU_GETOPT
  1563. bool "Support gnu getopt"
  1564. default y
  1565. help
  1566. Answer Y if you want to include full gnu getopt() instead of a
  1567. (much smaller) SUSv3 compatible getopt().
  1568. Note that getopt_long, getopt_long_only as well as getsubopt
  1569. are implemented on top of this choice.
  1570. Most people will answer Y.
  1571. config UCLIBC_HAS_GETOPT_LONG
  1572. bool "Support getopt_long/getopt_long_only (glibc-compat)"
  1573. default y
  1574. help
  1575. Answer Y if you want to include getopt_long[_only()] used by many
  1576. apps.
  1577. Most people will answer Y.
  1578. config UCLIBC_HAS_GNU_GETSUBOPT
  1579. bool "Support getsubopt"
  1580. default y
  1581. help
  1582. Answer Y if you want to include getsubopt().
  1583. Most people will answer Y.
  1584. config UCLIBC_HAS_ARGP
  1585. bool "Support argp (as standalone shared object)"
  1586. default n
  1587. help
  1588. Argp is an interface for parsing unix-style argument vectors. Unlike
  1589. the common getopt interface, it provides many advanced features in
  1590. addition to parsing options, such as automatic output in response to
  1591. `--help' and `--version' options.
  1592. A library can export an argp option parser, which programs can easily
  1593. use in conjunction with their own option parser.
  1594. A new shared object "libuargp" is created. The "libc.so" linker script
  1595. contains the AS_NEEDED entry for getting the libuargp linked automatically.
  1596. Argp support is needed by elfutils libdw.
  1597. Most people can safely answer N.
  1598. endmenu
  1599. menu "Big and Tall"
  1600. config UCLIBC_HAS_REGEX
  1601. bool "Regular Expression Support"
  1602. default y
  1603. help
  1604. POSIX regular expression code is really big -- 53k all by itself.
  1605. If you don't use regular expressions, turn this off and save space.
  1606. Of course, if you only statically link, leave this on, since it will
  1607. only be included in your apps if you use regular expressions.
  1608. config UCLIBC_HAS_REGEX_OLD
  1609. bool "Use the older (stable) regular expression code"
  1610. depends on UCLIBC_HAS_REGEX
  1611. default y
  1612. help
  1613. There are two versions of regex. The older (stable) version has
  1614. been in uClibc for quite a long time but hasn't seen too many
  1615. updates. It also has some known issues when dealing with uncommon
  1616. corner cases and multibyte/unicode strings. However, it is quite
  1617. a bit smaller than the newer version.
  1618. If the older version has worked for you and you don't need unicode
  1619. support, then stick with the old version (and say Y here).
  1620. Otherwise, you should use the new version (and say N here).
  1621. config UCLIBC_HAS_FNMATCH
  1622. bool "fnmatch Support"
  1623. default y
  1624. help
  1625. POSIX fnmatch.
  1626. config UCLIBC_HAS_FNMATCH_OLD
  1627. bool "Use the older (stable) fnmatch code"
  1628. depends on UCLIBC_HAS_FNMATCH
  1629. default y
  1630. help
  1631. There are two versions of fnmatch. The older (stable) version has
  1632. been in uClibc for quite a long time but hasn't seen too many
  1633. updates. It also has some known issues when dealing with uncommon
  1634. corner cases and multibyte/unicode strings. However, it is quite
  1635. a bit smaller than the newer version.
  1636. If the older version has worked for you and you don't need unicode
  1637. support, then stick with the old version (and say Y here).
  1638. Otherwise, you should use the new version (and say N here).
  1639. config UCLIBC_HAS_WORDEXP
  1640. bool "Support the wordexp() interface"
  1641. depends on UCLIBC_HAS_GLOB
  1642. help
  1643. The SuSv3 wordexp() interface performs word expansions per the Shell
  1644. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1645. intended for use by applications that want to implement all of the
  1646. standard Bourne shell expansions on input data.
  1647. This interface is rarely used, and very large. Unless you have a
  1648. pressing need for wordexp(), you should probably answer N.
  1649. config UCLIBC_HAS_NFTW
  1650. bool "Support the nftw() interface"
  1651. help
  1652. The SuSv3 nftw() interface is used to recursively descend
  1653. directory paths while repeatedly calling a function.
  1654. This interface is rarely used, and adds around 4.5k. Unless you have
  1655. a pressing need for nftw(), you should probably answer N.
  1656. config UCLIBC_HAS_FTW
  1657. bool "Support the ftw() interface (SUSv4-obsolete)"
  1658. depends on UCLIBC_SUSV4_LEGACY
  1659. help
  1660. The SuSv3 ftw() interface is used to recursively descend
  1661. directory paths while repeatedly calling a function.
  1662. This interface is rarely used, and adds around 4.5k. Unless you have
  1663. a pressing need for ftw(), you should probably answer N.
  1664. config UCLIBC_HAS_FTS
  1665. bool "Support the fts() interface (bsd-compat)"
  1666. help
  1667. The fts functions are provided for traversing UNIX file hierarchies.
  1668. This interface is currently used by the elfutils and adds
  1669. around 7.5k.
  1670. You should port your application to use the POSIX nftw()
  1671. interface.
  1672. Unless you need to build/use elfutils, you should prolly answer N.
  1673. config UCLIBC_HAS_GLOB
  1674. bool "Support the glob() interface"
  1675. depends on UCLIBC_HAS_FNMATCH
  1676. default y
  1677. help
  1678. The glob interface is somewhat large (weighing in at about 2,5k). It
  1679. is used fairly often, but is an option since people wanting to go for
  1680. absolute minimum size may wish to omit it.
  1681. Most people will answer Y.
  1682. config UCLIBC_HAS_GNU_GLOB
  1683. bool "Support gnu glob() interface"
  1684. depends on UCLIBC_HAS_GLOB
  1685. help
  1686. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1687. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1688. from glibc and does not support all the GNU specific options.
  1689. Answer Y if you want to include full gnu glob() instead of the smaller
  1690. SUSv3 compatible glob().
  1691. Most people will answer N.
  1692. endmenu
  1693. menu "Library Installation Options"
  1694. config RUNTIME_PREFIX
  1695. string "uClibc runtime library directory"
  1696. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1697. help
  1698. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1699. libraries will be installed. The result will look something
  1700. like the following:
  1701. $(RUNTIME_PREFIX)/
  1702. lib/ <contains all runtime libraries>
  1703. usr/bin/ldd <the ldd utility program>
  1704. sbin/ldconfig <the ldconfig utility program>
  1705. This value is used by the 'make install' Makefile target. Since this
  1706. directory is compiled into the shared library loader, you will need to
  1707. recompile uClibc if you change this value...
  1708. For a typical target system this should be set to "/", such that
  1709. 'make install' will install /lib/libuClibc-<VERSION>.so
  1710. config DEVEL_PREFIX
  1711. string "uClibc development environment directory"
  1712. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1713. help
  1714. DEVEL_PREFIX is the directory into which the uClibc development
  1715. environment will be installed. The result will look something
  1716. like the following:
  1717. $(DEVEL_PREFIX)/
  1718. lib/ <contains static libs>
  1719. include/ <Where all the header files go>
  1720. This value is used by the 'make install' Makefile target when
  1721. installing a uClibc development environment.
  1722. For a typical target system this should be set to "/usr", such that
  1723. 'make install' will install /usr/include/<header files>.
  1724. config MULTILIB_DIR
  1725. string "library path component"
  1726. default "lib"
  1727. help
  1728. Path component where libraries reside.
  1729. For a typical target system this should be set to "lib", such that
  1730. 'make install' will install libraries to "/lib" and "/usr/lib"
  1731. respectively
  1732. DEVEL_PREFIX/MULTILIB_DIR
  1733. RUNTIME_PREFIX/MULTILIB_DIR
  1734. Other settings may include "lib32" or "lib64".
  1735. config HARDWIRED_ABSPATH
  1736. bool "Hardwire absolute paths into linker scripts"
  1737. default y
  1738. help
  1739. This prepends absolute paths to the libraries mentioned in linker
  1740. scripts such as libc.so.
  1741. This is a build time optimization. It has no impact on dynamic
  1742. linking at runtime, which doesn't use linker scripts.
  1743. You must disable this to use uClibc with old non-sysroot toolchains,
  1744. such as the prebuilt binary cross compilers at:
  1745. http://uclibc.org/downloads/binaries
  1746. The amount of time saved by this optimization is actually too small to
  1747. measure. The linker just had to search the library path to find the
  1748. linker script, so the dentries are cache hot if it has to search the
  1749. same path again. But it's what glibc does, so we do it too.
  1750. endmenu
  1751. menu "Security options"
  1752. config UCLIBC_BUILD_PIE
  1753. bool "Build utilities as ET_DYN/PIE executables"
  1754. depends on HAVE_SHARED
  1755. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
  1756. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1757. help
  1758. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1759. executables.
  1760. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1761. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1762. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1763. all libraries have to be built with -fPIC or -fpic, and all
  1764. assembler functions must be written as position independent
  1765. code (PIC).
  1766. config UCLIBC_HAS_ARC4RANDOM
  1767. bool "Include the arc4random() function"
  1768. help
  1769. Answer Y to support the OpenBSD-like arc4random() function. This
  1770. function picks a random number between 0 and N, and will always return
  1771. something even if the random driver is dead. If urandom fails then
  1772. gettimeofday(2) will be used as the random seed. This function is
  1773. designed to be more dependable than invoking /dev/urandom directly.
  1774. OpenSSL and OpenNTPD currently support this function.
  1775. Most people will answer N.
  1776. config ARC4RANDOM_USES_NODEV
  1777. bool "Do not use /dev/urandom with arc4random()"
  1778. depends on UCLIBC_HAS_ARC4RANDOM
  1779. help
  1780. Answer Y to use gettimeofday(2) and getpid(2) exclusively for
  1781. arc4random(). This is not a bad idea for a diskless system, but
  1782. it uses a lot of syscalls to stir each array element.
  1783. Most people will answer N.
  1784. config HAVE_NO_SSP
  1785. bool
  1786. config UCLIBC_HAS_SSP
  1787. bool "Support for GCC stack smashing protector"
  1788. depends on !HAVE_NO_SSP
  1789. help
  1790. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1791. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1792. the needed functions are added to ldso/libc instead.
  1793. GCC's stack protector is a reimplementation of IBM's propolice.
  1794. See http://www.trl.ibm.com/projects/security/ssp/ and
  1795. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1796. for details.
  1797. Note that NOEXECSTACK on a kernel with address space randomization
  1798. is generally sufficient to prevent most buffer overflow exploits
  1799. without increasing code size. This option essentially adds debugging
  1800. code to catch them.
  1801. Most people will answer N.
  1802. config UCLIBC_HAS_SSP_COMPAT
  1803. bool "Support for gcc-3.x propolice smashing stack protector"
  1804. depends on UCLIBC_HAS_SSP
  1805. help
  1806. Add gcc-3.x propolice smashing stack protector to the library.
  1807. This requires a patched version of GCC, supporting the
  1808. -fstack-protector[-all] options, with the __guard and
  1809. __stack_smash_handler functions removed from libgcc.
  1810. These functions are added to ldso/libc instead.
  1811. More information at:
  1812. <http://www.research.ibm.com/trl/projects/security/ssp/>
  1813. Most people will answer N.
  1814. config SSP_QUICK_CANARY
  1815. bool "Use simple guard values without accessing /dev/urandom"
  1816. depends on UCLIBC_HAS_SSP
  1817. help
  1818. Use gettimeofday(2) to define the __guard without accessing
  1819. /dev/urandom.
  1820. WARNING: This makes smashing stack protector vulnerable to timing
  1821. attacks.
  1822. Most people will answer N.
  1823. choice
  1824. prompt "Propolice protection blocking signal"
  1825. depends on UCLIBC_HAS_SSP
  1826. depends on DODEBUG
  1827. default PROPOLICE_BLOCK_SEGV
  1828. help
  1829. "abort" use SIGABRT to block offending programs.
  1830. This is the default implementation.
  1831. "segfault" use SIGSEGV to block offending programs.
  1832. Use this for debugging.
  1833. If unsure, answer "abort".
  1834. config PROPOLICE_BLOCK_ABRT
  1835. bool "abort"
  1836. config PROPOLICE_BLOCK_SEGV
  1837. bool "segfault"
  1838. endchoice
  1839. config UCLIBC_BUILD_SSP
  1840. bool "Build uClibc with -fstack-protector"
  1841. depends on UCLIBC_HAS_SSP
  1842. help
  1843. Build all uClibc libraries and executables with -fstack-protector,
  1844. adding extra stack overflow checking to most uClibc functions.
  1845. config UCLIBC_BUILD_RELRO
  1846. bool "Build uClibc with linker option -z RELRO"
  1847. depends on HAVE_SHARED
  1848. default y
  1849. help
  1850. Build all libraries and executables with "ld -z relro".
  1851. This tells the linker to mark chunks of an executable or shared
  1852. library read-only after applying dynamic relocations. (This comes
  1853. up when a global const variable is initialized to the address of a
  1854. function or the value of another global variable.)
  1855. This is a fairly obscure option the ld man page doesn't even bother
  1856. to document properly. It's a security paranoia issue that's more
  1857. likely to consume memory (by allocating an extra page) rather than
  1858. save it.
  1859. This is explained in more depth at
  1860. http://www.airs.com/blog/archives/189
  1861. Nobody is likely to care whether you say Y or N here.
  1862. config UCLIBC_BUILD_NOW
  1863. bool "Build uClibc with linker option -z NOW"
  1864. depends on HAVE_SHARED
  1865. help
  1866. Build all libraries and executables with "ld -z now".
  1867. This tells the linker to resolve all symbols when the library is
  1868. first loaded, rather than when each function is first called. This
  1869. increases start-up latency by a few microseconds and may do
  1870. unnecessary work (resolving symbols that are never used), but the
  1871. realtime people like it for making microbenchmark timings slightly
  1872. more predictable and in some cases it can be slightly faster due to
  1873. CPU cache behavior (not having to fault the linker back in to do
  1874. lazy symbol resolution).
  1875. Most people can't tell the difference between selecting Y or N here.
  1876. config UCLIBC_BUILD_NOEXECSTACK
  1877. bool "Build uClibc with noexecstack marking"
  1878. default y
  1879. help
  1880. Mark all assembler files as noexecstack, which will mark uClibc
  1881. as not requiring an executable stack. (This doesn't prevent other
  1882. files you link against from claiming to need an executable stack, it
  1883. just won't cause uClibc to request it unnecessarily.)
  1884. This is a security thing to make buffer overflows harder to exploit.
  1885. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1886. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1887. It only actually provides any security when combined with address
  1888. space randomization, explained here: http://lwn.net/Articles/121845/
  1889. Address space randomization is on by default in current linux
  1890. kernels (although it can be disabled using the option
  1891. CONFIG_COMPAT_BRK).
  1892. You should probably say Y.
  1893. endmenu
  1894. menu "Development/debugging options"
  1895. config CROSS_COMPILER_PREFIX
  1896. string "Cross-compiling toolchain prefix"
  1897. default ""
  1898. help
  1899. The prefix used to execute your cross-compiling toolchain. For
  1900. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1901. then enter 'arm-linux-uclibc-' here.
  1902. config UCLIBC_EXTRA_CFLAGS
  1903. string "Extra CFLAGS"
  1904. default ""
  1905. help
  1906. Add any additional CFLAGS to be used to build uClibc.
  1907. config DODEBUG
  1908. bool "Enable debugging symbols"
  1909. select EXTRA_WARNINGS
  1910. help
  1911. Say Y here if you wish to compile uClibc with debugging symbols.
  1912. This will allow you to use a debugger to examine uClibc internals
  1913. while applications are running. This increases the size of the
  1914. library considerably and should only be used when doing development.
  1915. If you are doing development and want to debug uClibc, answer Y.
  1916. Otherwise, answer N.
  1917. config DODEBUG_PT
  1918. bool "Build pthread with debugging output"
  1919. depends on UCLIBC_HAS_THREADS && LINUXTHREADS_OLD
  1920. help
  1921. Enable debug output in libpthread. This is only useful when doing
  1922. development in libpthread itself.
  1923. Otherwise, answer N.
  1924. config DOSTRIP
  1925. bool "Strip libraries and executables"
  1926. default y
  1927. depends on !DODEBUG
  1928. help
  1929. Say Y here if you do wish to strip all uClibc libraries and
  1930. executables. No stripping increases the size of the binaries
  1931. considerably, but makes it possible to debug uClibc libraries.
  1932. Most people will answer Y.
  1933. config DOASSERTS
  1934. bool "Build with run-time assertion testing"
  1935. help
  1936. Say Y here to include runtime assertion tests.
  1937. This enables runtime assertion testing in some code, which can
  1938. increase the size of the library and incur runtime overhead.
  1939. If you say N, then this testing will be disabled.
  1940. config SUPPORT_LD_DEBUG
  1941. bool "Build the shared library loader with debugging support"
  1942. depends on HAVE_SHARED
  1943. help
  1944. Answer Y here to enable all the extra code needed to debug the uClibc
  1945. native shared library loader. The level of debugging noise that is
  1946. generated depends on the LD_DEBUG environment variable... Just set
  1947. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1948. debug your application. Diagnostic messages will then be printed to
  1949. the stderr.
  1950. For now these debugging tokens are available:
  1951. detail provide more information for some options
  1952. move display copy processing
  1953. symbols display symbol table processing
  1954. reloc display relocation processing; detail shows the
  1955. relocation patch
  1956. nofixups never fixes up jump relocations
  1957. bindings displays the resolve processing (function calls);
  1958. detail shows the relocation patch
  1959. all Enable everything!
  1960. The additional environment variable:
  1961. LD_DEBUG_OUTPUT=file
  1962. redirects the diagnostics to an output file created using
  1963. the specified name and the process id as a suffix.
  1964. An excellent start is simply:
  1965. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1966. or to log everything to a file named 'logfile', try this
  1967. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1968. If you are doing development and want to debug uClibc's shared library
  1969. loader, answer Y. Mere mortals answer N.
  1970. config SUPPORT_LD_DEBUG_EARLY
  1971. bool "Build the shared library loader with early debugging support"
  1972. depends on HAVE_SHARED
  1973. help
  1974. Answer Y here to if you find the uClibc shared library loader is
  1975. crashing or otherwise not working very early on. This is typical
  1976. only when starting a new port when you haven't figured out how to
  1977. properly get the values for argc, argv, environ, etc. This method
  1978. allows a degree of visibility into the very early shared library
  1979. loader initialization process. If you are doing development and want
  1980. to debug the uClibc shared library loader early initialization,
  1981. answer Y. Mere mortals answer N.
  1982. config UCLIBC_MALLOC_DEBUGGING
  1983. bool "Build malloc with debugging support"
  1984. depends on MALLOC || MALLOC_STANDARD
  1985. select DOASSERTS
  1986. help
  1987. Answer Y here to compile extra debugging support code into malloc.
  1988. Malloc debugging output may then be enabled at runtime using the
  1989. MALLOC_DEBUG environment variable.
  1990. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1991. as a bitmask with the following bits:
  1992. 1 - do extra consistency checking
  1993. 2 - output messages for malloc/free calls and OS
  1994. allocation calls
  1995. 4 - output messages for the `MMB' layer
  1996. 8 - output messages for internal malloc heap manipulation
  1997. calls
  1998. Because this increases the size of malloc appreciably (due to strings
  1999. etc), you should say N unless you need to debug a malloc problem.
  2000. config UCLIBC_HAS_BACKTRACE
  2001. bool "Add support for application self-debugging"
  2002. depends on HAVE_SHARED
  2003. help
  2004. Answer Y here to compile support for application self-debugging, by adding
  2005. a new shared object "libubacktrace.so" that provides the following new
  2006. functions:
  2007. backtrace, backtrace_symbols, backtrace_symbols_fd
  2008. The backtrace functionality is currently supported on SH platform, and it
  2009. based on dwarf2 informations to properly work, so any application that
  2010. want to use backtrace needs to be built with -fexceptions flag.
  2011. The symbol names may be unavailable without the use of special linker
  2012. options. For systems using the GNU linker, it is necessary to use the
  2013. -rdynamic linker option too. Note that names of "static" functions are not
  2014. exposed, and won't be available in the backtrace.
  2015. config WARNINGS
  2016. string "Compiler Warnings"
  2017. default "-Wall"
  2018. help
  2019. Set this to the set of compiler warnings you wish to see while compiling.
  2020. config EXTRA_WARNINGS
  2021. bool "Enable extra annoying warnings"
  2022. help
  2023. If you wish to build with extra warnings enabled, say Y here.
  2024. config DOMULTI
  2025. bool "Compile all sources at once into an object"
  2026. help
  2027. Set this to compile all sources at once into an object (IMA).
  2028. This mode of compilation uses alot of memory but may produce
  2029. smaller binaries.
  2030. Note that you need a very recent GCC for this to work, like
  2031. gcc >= 4.3 plus eventually some patches.
  2032. If unsure, keep the default of N.
  2033. endmenu