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