Config.in 77 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 $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_e1 if DESIRED_TARGET_ARCH = "e1"
  21. default TARGET_frv if DESIRED_TARGET_ARCH = "frv"
  22. default TARGET_h8300 if DESIRED_TARGET_ARCH = "h8300"
  23. default TARGET_hppa if DESIRED_TARGET_ARCH = "hppa"
  24. default TARGET_i386 if DESIRED_TARGET_ARCH = "i386"
  25. default TARGET_i960 if DESIRED_TARGET_ARCH = "i960"
  26. default TARGET_ia64 if DESIRED_TARGET_ARCH = "ia64"
  27. default TARGET_m68k if DESIRED_TARGET_ARCH = "m68k"
  28. default TARGET_metag if DESIRED_TARGET_ARCH = "metag"
  29. default TARGET_microblaze if DESIRED_TARGET_ARCH = "microblaze"
  30. default TARGET_mips if DESIRED_TARGET_ARCH = "mips"
  31. default TARGET_nios if DESIRED_TARGET_ARCH = "nios"
  32. default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
  33. default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
  34. default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
  35. default TARGET_sh64 if DESIRED_TARGET_ARCH = "sh64"
  36. default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
  37. default TARGET_v850 if DESIRED_TARGET_ARCH = "v850"
  38. default TARGET_vax if DESIRED_TARGET_ARCH = "vax"
  39. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  40. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  41. help
  42. The architecture of your target.
  43. #config TARGET_alpha
  44. # bool "alpha"
  45. config TARGET_arc
  46. bool "arc"
  47. config TARGET_arm
  48. bool "arm"
  49. config TARGET_avr32
  50. bool "avr32"
  51. config TARGET_bfin
  52. bool "bfin"
  53. # someone could sync this tree:
  54. # http://linux-c6x.org/git/?p=uClibc.git;a=summary
  55. config TARGET_c6x
  56. bool "c6x"
  57. config TARGET_cris
  58. bool "cris"
  59. #config TARGET_e1
  60. # bool "e1 (BROKEN)"
  61. #config TARGET_frv
  62. # bool "frv (BROKEN)"
  63. #config TARGET_h8300
  64. # bool "h8300 (BROKEN)"
  65. #config TARGET_hppa
  66. # bool "hppa"
  67. config TARGET_i386
  68. bool "i386"
  69. #config TARGET_i960
  70. # bool "i960 (BROKEN)"
  71. #config TARGET_ia64
  72. # bool "ia64"
  73. config TARGET_m68k
  74. bool "m68k"
  75. #config TARGET_metag
  76. # bool "metag"
  77. config TARGET_microblaze
  78. bool "microblaze"
  79. config TARGET_mips
  80. bool "mips"
  81. #config TARGET_nios
  82. # bool "nios"
  83. config TARGET_nios2
  84. bool "nios2"
  85. config TARGET_powerpc
  86. bool "powerpc"
  87. config TARGET_sh
  88. bool "superh"
  89. #config TARGET_sh64
  90. # bool "sh64"
  91. config TARGET_sparc
  92. bool "sparc"
  93. #config TARGET_v850
  94. # bool "v850 (BROKEN)"
  95. #config TARGET_vax
  96. # bool "vax"
  97. config TARGET_x86_64
  98. bool "x86_64"
  99. config TARGET_xtensa
  100. bool "xtensa"
  101. endchoice
  102. menu "Target Architecture Features and Options"
  103. if TARGET_alpha
  104. source "extra/Configs/Config.alpha"
  105. endif
  106. if TARGET_arm
  107. source "extra/Configs/Config.arm"
  108. endif
  109. if TARGET_avr32
  110. source "extra/Configs/Config.avr32"
  111. endif
  112. if TARGET_bfin
  113. source "extra/Configs/Config.bfin"
  114. endif
  115. if TARGET_cris
  116. source "extra/Configs/Config.cris"
  117. endif
  118. if TARGET_e1
  119. source "extra/Configs/Config.e1"
  120. endif
  121. if TARGET_frv
  122. source "extra/Configs/Config.frv"
  123. endif
  124. if TARGET_h8300
  125. source "extra/Configs/Config.h8300"
  126. endif
  127. if TARGET_hppa
  128. source "extra/Configs/Config.hppa"
  129. endif
  130. if TARGET_i386
  131. source "extra/Configs/Config.i386"
  132. endif
  133. if TARGET_i960
  134. source "extra/Configs/Config.i960"
  135. endif
  136. if TARGET_ia64
  137. source "extra/Configs/Config.ia64"
  138. endif
  139. if TARGET_m68k
  140. source "extra/Configs/Config.m68k"
  141. endif
  142. if TARGET_metag
  143. source "extra/Configs/Config.metag"
  144. endif
  145. if TARGET_nios
  146. source "extra/Configs/Config.nios"
  147. endif
  148. if TARGET_nios2
  149. source "extra/Configs/Config.nios2"
  150. endif
  151. if TARGET_microblaze
  152. source "extra/Configs/Config.microblaze"
  153. endif
  154. if TARGET_mips
  155. source "extra/Configs/Config.mips"
  156. endif
  157. if TARGET_powerpc
  158. source "extra/Configs/Config.powerpc"
  159. endif
  160. if TARGET_sh
  161. source "extra/Configs/Config.sh"
  162. endif
  163. if TARGET_sh64
  164. source "extra/Configs/Config.sh64"
  165. endif
  166. if TARGET_sparc
  167. source "extra/Configs/Config.sparc"
  168. endif
  169. if TARGET_v850
  170. source "extra/Configs/Config.v850"
  171. endif
  172. if TARGET_vax
  173. source "extra/Configs/Config.vax"
  174. endif
  175. if TARGET_x86_64
  176. source "extra/Configs/Config.x86_64"
  177. endif
  178. if TARGET_xtensa
  179. source "extra/Configs/Config.xtensa"
  180. endif
  181. if TARGET_c6x
  182. source "extra/Configs/Config.c6x"
  183. endif
  184. if TARGET_arc
  185. source "extra/Configs/Config.arc"
  186. endif
  187. config TARGET_SUBARCH
  188. string
  189. default "e500" if CONFIG_E500
  190. default "classic" if CONFIG_CLASSIC
  191. default "sh4" if CONFIG_SH4
  192. default "" if CONFIG_386
  193. default "i486" if CONFIG_486
  194. default "i586" if CONFIG_586
  195. default "i686" if CONFIG_686
  196. default "arcv2" if CONFIG_ARC_CPU_HS
  197. default ""
  198. source "extra/Configs/Config.in.arch"
  199. endmenu
  200. menu "General Library Settings"
  201. config HAVE_NO_PIC
  202. bool
  203. config DOPIC
  204. bool "Generate only Position Independent Code (PIC)"
  205. default y
  206. depends on !HAVE_NO_PIC
  207. help
  208. If you wish to build all of uClibc as PIC objects, then answer Y here.
  209. If you are unsure, then you should answer N.
  210. config ARCH_HAS_NO_SHARED
  211. bool
  212. config ARCH_HAS_NO_LDSO
  213. bool
  214. select ARCH_HAS_NO_SHARED
  215. config ARCH_HAS_UCONTEXT
  216. bool
  217. config HAVE_SHARED
  218. bool "Enable shared libraries"
  219. depends on !ARCH_HAS_NO_SHARED
  220. default y
  221. help
  222. If you wish to build uClibc with support for shared libraries then
  223. answer Y here. If you only want to build uClibc as a static library,
  224. then answer N.
  225. config FORCE_SHAREABLE_TEXT_SEGMENTS
  226. bool "Only load shared libraries which can share their text segment"
  227. depends on HAVE_SHARED
  228. select DOPIC
  229. help
  230. If you answer Y here, the uClibc native shared library loader will
  231. only load shared libraries, which do not need to modify any
  232. non-writable segments. These libraries haven't set the DT_TEXTREL
  233. tag in the dynamic section (==> objdump).
  234. All your libraries must be compiled with -fPIC or -fpic, and all
  235. assembler function must be written as position independent code (PIC).
  236. Enabling this option will make uClibc's shared library loader a
  237. little bit smaller and guarantee that no memory will be wasted by
  238. badly coded shared libraries.
  239. config LDSO_LDD_SUPPORT
  240. bool "Native 'ldd' support"
  241. depends on HAVE_SHARED
  242. default y
  243. help
  244. Enable all the code needed to support traditional ldd,
  245. which executes the shared library loader to resolve all dependencies
  246. and then provide a list of shared libraries that are required for an
  247. application to function. Disabling this option will make uClibc's
  248. shared library loader a little bit smaller.
  249. Most people will answer Y.
  250. config LDSO_CACHE_SUPPORT
  251. bool "Enable library loader cache (ld.so.conf)"
  252. depends on HAVE_SHARED
  253. default y
  254. help
  255. Enable this to make use of /etc/ld.so.conf, the shared library loader
  256. cache configuration file to support for non-standard library paths.
  257. After updating this file, it is necessary to run 'ldconfig' to update
  258. the /etc/ld.so.cache shared library loader cache file.
  259. config LDSO_PRELOAD_ENV_SUPPORT
  260. bool "Enable library loader LD_PRELOAD environment"
  261. depends on HAVE_SHARED
  262. default y
  263. help
  264. Enable this to make use of LD_PRELOAD environment variable.
  265. A whitespace-separated list of additional, user-specified, ELF shared
  266. libraries to be loaded before all others. This can be used to
  267. selectively override functions in other shared libraries. For
  268. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  269. search directories that are also set-user-ID will be loaded.
  270. config LDSO_PRELOAD_FILE_SUPPORT
  271. bool "Enable library loader preload file (ld.so.preload)"
  272. depends on HAVE_SHARED
  273. help
  274. Enable this to make use of /etc/ld.so.preload. This file contains a
  275. whitespace separated list of shared libraries to be loaded before
  276. the program.
  277. config LDSO_BASE_FILENAME
  278. string "Shared library loader naming prefix"
  279. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  280. default "ld.so"
  281. help
  282. If you wish to support both uClibc and glibc on the same system, it
  283. is necessary to set this to something other than "ld.so" to avoid
  284. conflicts with glibc, which also uses "ld.so". This prevents both
  285. libraries from using the same /etc/ld.so.* files. If you wish to
  286. support both uClibc and glibc on the same system then you should set
  287. this to "ld-uClibc.so".
  288. Most people will leave this set to the default of "ld.so".
  289. WARNING: Changing the default prefix could cause problems with
  290. binutils' ld !
  291. config LDSO_STANDALONE_SUPPORT
  292. bool "Dynamic linker stand-alone mode support"
  293. depends on HAVE_SHARED
  294. help
  295. The dynamic linker can be run either indirectly through running some
  296. dynamically linked program or library (in which case no command line
  297. options to the dynamic linker can be passed and, in the ELF case, the
  298. dynamic linker which is stored in the .interp section of the program
  299. is executed) or directly by running:
  300. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  301. Stand-alone execution is a prerequisite for adding prelink
  302. capabilities to uClibc dynamic linker, as well useful for testing an
  303. updated version of the dynamic linker without breaking the system.
  304. config LDSO_PRELINK_SUPPORT
  305. bool "Dynamic linker prelink support"
  306. depends on HAVE_SHARED
  307. select LDSO_STANDALONE_SUPPORT
  308. help
  309. The dynamic linker can be used in stand-alone mode by the prelink tool
  310. for prelinking ELF shared libraries and binaries to speed up startup
  311. time. It also is able to load and handle prelinked libraries and
  312. binaries at runtime.
  313. config UCLIBC_STATIC_LDCONFIG
  314. bool "Link ldconfig statically"
  315. depends on HAVE_SHARED
  316. default y
  317. help
  318. Enable this option to statically link the ldconfig binary.
  319. Making ldconfig static can be beneficial if you have a library
  320. problem and need to use ldconfig to recover. Sometimes it is
  321. preferable to instead keep the size of the system down, in which
  322. case you should disable this option.
  323. config LDSO_RUNPATH
  324. bool "Enable ELF RUNPATH tag support"
  325. depends on HAVE_SHARED
  326. default y if LDSO_CACHE_SUPPORT
  327. help
  328. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  329. which extend the library search paths. They are really only useful
  330. if a package installs libraries in non standard locations and
  331. ld.so.conf support is disabled.
  332. Usage of RUNPATH tags is not too common, so disabling this feature
  333. should be safe for most people.
  334. config LDSO_RUNPATH_OF_EXECUTABLE
  335. bool "Use executables RUNPATH/RPATH when searching for libraries."
  336. depends on LDSO_RUNPATH
  337. default n
  338. help
  339. Use the executables RUNPATH/RPATH to find to find libraries even
  340. though this behavour is not standard. Setting this option causes
  341. the uclibc dynamic linker behavour to match the glibc dynamic linker.
  342. config LDSO_SAFE_RUNPATH
  343. bool "Allow only RUNPATH beginning with /"
  344. depends on LDSO_RUNPATH
  345. default y
  346. help
  347. Allow only absolute path in RPATH/RUNPATH.
  348. config LDSO_SEARCH_INTERP_PATH
  349. bool "Add ldso path to lib search path"
  350. depends on HAVE_SHARED
  351. default y
  352. help
  353. The ldso is told where it is being executed from and can use that
  354. path to find related core libraries. This is useful by default,
  355. but can be annoying in a mixed development environment.
  356. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  357. library search with /foo/boo/
  358. If unsure, simply say Y here.
  359. config LDSO_LD_LIBRARY_PATH
  360. bool "Add LD_LIBRARY_PATH to lib search path"
  361. depends on HAVE_SHARED
  362. default y
  363. help
  364. On hardened system it could be useful to disable the use of
  365. LD_LIBRARY_PATH environment variable (a colon-separated list of
  366. directories in which to search for ELF libraries at execution-time).
  367. If unsure, simply say Y here.
  368. config LDSO_NO_CLEANUP
  369. bool "Disable automatic unloading of dynamically loaded shared objects"
  370. depends on HAVE_SHARED
  371. help
  372. If you need complete allocation traces when debugging memory leaks
  373. using Valgrind in a process that dynamically loads shared objects,
  374. then answer Y here. Unlike glibc, uClibc unloads all dynamically
  375. loaded shared objects when a process exits, which prevents Valgrind
  376. from correctly resolving the symbols from the unloaded shared objects.
  377. Unless you know you need this, you should answer N.
  378. config UCLIBC_CTOR_DTOR
  379. boolean
  380. default y
  381. help
  382. If you wish to build uClibc with support for global constructor
  383. (ctor) and global destructor (dtor) support, then answer Y here.
  384. When ctor/dtor support is enabled, binaries linked with uClibc must
  385. also be linked with crtbegin.o and crtend.o which are provided by gcc
  386. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  387. may need to be adjusted to include these files). This support will
  388. also add a small amount of additional size to each binary compiled vs
  389. uClibc. If you will be using uClibc with C++, or if you need the gcc
  390. __attribute__((constructor)) and __attribute__((destructor)) to work,
  391. then you definitely want to answer Y here. If you don't need ctors
  392. or dtors and want your binaries to be as small as possible, then
  393. answer N.
  394. config LDSO_GNU_HASH_SUPPORT
  395. bool "Enable GNU hash style support"
  396. depends on HAVE_SHARED
  397. help
  398. Newest binutils support a new hash style named GNU-hash. The dynamic
  399. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  400. if present into the ELF binaries, otherwise it will use the old SysV
  401. hash style (.hash). This ensures that it is completely backward
  402. compatible.
  403. Further, being the hash table implementation self-contained into each
  404. executable and shared libraries, objects with mixed hash style can
  405. peacefully coexist in the same process.
  406. If you want to use this new feature, answer Y
  407. choice
  408. prompt "Thread support"
  409. #default UCLIBC_HAS_THREADS_NATIVE if (TARGET_alpha || TARGET_arm || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_sh || TARGET_sh64)
  410. default HAS_NO_THREADS
  411. help
  412. If you want to compile uClibc with pthread support, then answer Y.
  413. This will increase the size of uClibc by adding a bunch of locking
  414. to critical data structures, and adding extra code to ensure that
  415. functions are properly reentrant.
  416. config HAS_NO_THREADS
  417. bool "none"
  418. help
  419. Disable thread support.
  420. config LINUXTHREADS_OLD
  421. bool "older (stable) version of linuxthreads"
  422. # linuxthreads and linuxthreads.old need nanosleep()
  423. select UCLIBC_HAS_REALTIME
  424. depends on !TARGET_arc && \
  425. !TARGET_i386 && \
  426. !TARGET_metag && \
  427. !TARGET_mips && \
  428. !TARGET_powerpc && \
  429. !TARGET_sh && \
  430. !TARGET_sparc && \
  431. !TARGET_x86_64 && \
  432. !TARGET_xtensa
  433. help
  434. There are two versions of linuxthreads. The older (stable) version
  435. has been in uClibc for quite a long time but hasn't seen too many
  436. updates other than bugfixes.
  437. config LINUXTHREADS_NEW
  438. bool "slightly newer version of linuxthreads"
  439. depends on ARCH_HAS_DEPRECATED_SYSCALLS
  440. depends on !TARGET_arc && \
  441. !TARGET_arm && \
  442. !TARGET_i386 && \
  443. !TARGET_metag && \
  444. !TARGET_mips && \
  445. !TARGET_powerpc && \
  446. !TARGET_sh && \
  447. !TARGET_sparc && \
  448. !TARGET_x86_64 && \
  449. !TARGET_xtensa
  450. help
  451. The new version has not been tested much, and lacks ports for arches
  452. which glibc does not support (like bfin/frv/etc...), but is based on
  453. the latest code from glibc, so it may be the only choice for the
  454. newer ports (like alpha/amd64/64bit arches and hppa).
  455. config UCLIBC_HAS_THREADS_NATIVE
  456. bool "Native POSIX Threading (NPTL)"
  457. select UCLIBC_HAS_TLS
  458. select UCLIBC_HAS_STDIO_FUTEXES
  459. select UCLIBC_HAS_REALTIME
  460. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  461. depends on !CONFIG_386 && \
  462. !TARGET_alpha && \
  463. !TARGET_avr32 && \
  464. !TARGET_bfin && \
  465. !TARGET_c6x && \
  466. !TARGET_cris && \
  467. !TARGET_hppa && \
  468. !TARGET_ia64 && \
  469. !TARGET_m68k && \
  470. !TARGET_microblaze && \
  471. !TARGET_nios2 && \
  472. !TARGET_vax
  473. help
  474. If you want to compile uClibc with NPTL support, then answer Y.
  475. endchoice
  476. config UCLIBC_HAS_THREADS
  477. def_bool y if !HAS_NO_THREADS
  478. config UCLIBC_HAS_TLS
  479. bool "Thread-Local Storage"
  480. depends on UCLIBC_HAS_THREADS_NATIVE
  481. help
  482. If you want to enable TLS support then answer Y.
  483. This is fast an efficient way to store per-thread local data
  484. which is not on stack. It needs __thread support enabled in
  485. gcc.
  486. config PTHREADS_DEBUG_SUPPORT
  487. bool "Build pthreads debugging support"
  488. depends on UCLIBC_HAS_THREADS
  489. help
  490. Say Y here if you wish to be able to debug applications that use
  491. uClibc's pthreads library. By enabling this option, a library
  492. named libthread_db will be built. This library will be dlopen()'d
  493. by gdb and will allow gdb to debug the threads in your application.
  494. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  495. you must compile gdb with uClibc in order for pthread debugging to
  496. work properly.
  497. If you are doing development and want to debug applications using
  498. uClibc's pthread library, answer Y. Otherwise, answer N.
  499. config UCLIBC_HAS_SYSLOG
  500. bool "Syslog support"
  501. default y
  502. depends on UCLIBC_HAS_NETWORK_SUPPORT
  503. select UCLIBC_HAS_SOCKET
  504. help
  505. Support sending messages to the system logger.
  506. This requires socket-support.
  507. config UCLIBC_HAS_LFS
  508. bool "Large File Support"
  509. default y
  510. help
  511. If you wish to build uClibc with support for accessing large files
  512. (i.e. files greater then 2 GiB) then answer Y. Do not enable this
  513. if you are using an older Linux kernel (2.0.x) that lacks large file
  514. support. Enabling this option will increase the size of uClibc.
  515. choice
  516. prompt "Malloc Implementation"
  517. default MALLOC if ! ARCH_USE_MMU
  518. default MALLOC_STANDARD if ARCH_USE_MMU
  519. config MALLOC
  520. bool "malloc"
  521. help
  522. "malloc" use mmap for all allocations and so works very well on
  523. MMU-less systems that do not support the brk() system call. It is
  524. pretty smart about reusing already allocated memory, and minimizing
  525. memory wastage.
  526. This is the default for uClinux MMU-less systems.
  527. config MALLOC_SIMPLE
  528. bool "malloc-simple"
  529. help
  530. "malloc-simple" is trivially simple and slow as molasses. It
  531. was written from scratch for uClibc, and is the simplest possible
  532. (and therefore smallest) malloc implementation.
  533. This uses only the mmap() system call to allocate and free memory,
  534. and does not use the brk() system call at all, making it a fine
  535. choice for MMU-less systems with very limited memory. It's 100%
  536. standards compliant, thread safe, very small, and releases freed
  537. memory back to the OS immediately rather than keeping it in the
  538. process's heap for reallocation. It is also VERY SLOW.
  539. config MALLOC_STANDARD
  540. bool "malloc-standard"
  541. depends on ARCH_USE_MMU
  542. help
  543. "malloc-standard" is derived from the public domain dlmalloc
  544. implementation by Doug Lea. It is quite fast, and is pretty smart
  545. about reusing already allocated memory, and minimizing memory
  546. wastage. This uses brk() for small allocations, while using mmap()
  547. for larger allocations. This is the default malloc implementation
  548. for uClibc.
  549. If unsure, answer "malloc-standard".
  550. endchoice
  551. config MALLOC_GLIBC_COMPAT
  552. bool "Malloc returns live pointer for malloc(0)"
  553. help
  554. The behavior of malloc(0) is listed as implementation-defined by
  555. SuSv3. Glibc returns a valid pointer to something, while uClibc
  556. normally returns NULL. I personally feel glibc's behavior is
  557. not particularly safe, and allows buggy applications to hide very
  558. serious problems.
  559. When this option is enabled, uClibc will act just like glibc, and
  560. return a live pointer when someone calls malloc(0). This pointer
  561. provides a malloc'ed area with a size of 1 byte. This feature is
  562. mostly useful when dealing with applications using autoconf's broken
  563. AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
  564. does not detect glibc style returning-a-valid-pointer-for-malloc(0)
  565. behavior). Most people can safely answer N.
  566. config UCLIBC_HAS_OBSTACK
  567. bool "Obstack Support (gnu extension)"
  568. help
  569. When this option is enabled, uClibc will provide support for obstacks.
  570. An obstack is a structure in which memory can be dynamically allocated
  571. as a 'stack of objects'. Many programs need this GNU extention and
  572. you should say Y if you are using any. Otherwise, say N to save some
  573. space.
  574. config UCLIBC_DYNAMIC_ATEXIT
  575. bool "Dynamic atexit() Support"
  576. default y
  577. help
  578. When this option is enabled, uClibc will support an infinite number,
  579. of atexit() and on_exit() functions, limited only by your available
  580. memory. This can be important when uClibc is used with C++, since
  581. global destructors are implemented via atexit(), and it is quite
  582. possible to exceed the default number when this option is disabled.
  583. Enabling this option adds a few bytes, and more significantly makes
  584. atexit and on_exit depend on malloc, which can be bad when compiling
  585. static executables.
  586. Unless you use uClibc with C++, you should probably answer N.
  587. config COMPAT_ATEXIT
  588. bool "Old (visible) atexit Support"
  589. help
  590. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  591. else you will be missing atexit() until you rebuild all apps.
  592. config UCLIBC_HAS_UTMPX
  593. bool "utmpx based support for tracking login/logouts to/from the system"
  594. help
  595. Answer y to enable support for accessing user accounting database.
  596. It can be used to track all login/logout to the system.
  597. config UCLIBC_HAS_UTMP
  598. bool "utmp support (XPG2 compat, SVr4 compat)"
  599. depends on UCLIBC_HAS_UTMPX
  600. help
  601. Answer y to enable legacy SVID support for accessing
  602. user accounting database:
  603. getutent(), getutid(), getutline(), pututline(),
  604. setutent(), endutent(), utmpname() in utmp.h
  605. It can be used to track all login/logout to the system.
  606. If unsure, answer N and use corresponding POSIX functions
  607. from utmpx.h
  608. config UCLIBC_SUSV2_LEGACY
  609. bool "Enable SuSv2 LEGACY functions"
  610. help
  611. Enable this option if you want to have SuSv2 LEGACY functions
  612. Currently applies to:
  613. valloc
  614. WARNING! ABI incompatibility.
  615. config UCLIBC_SUSV3_LEGACY
  616. bool "Enable SuSv3 LEGACY functions"
  617. #vfork,
  618. # h_errno
  619. # gethostbyaddr
  620. # gethostbyname
  621. help
  622. Enable this option if you want to have SuSv3 LEGACY functions
  623. in the library, else they are replaced by SuSv3 proposed macros.
  624. Currently applies to:
  625. bcmp, bcopy, bzero, index, rindex, ftime,
  626. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  627. (getwd), (makecontext),
  628. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  629. scalb, (setcontext), (swapcontext), ualarm, usleep,
  630. wcswcs.
  631. WARNING! ABI incompatibility.
  632. config UCLIBC_HAS_CONTEXT_FUNCS
  633. bool "Use obsolescent context control functions"
  634. depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
  635. help
  636. Add into library the SuSv3 obsolescent functions used for context
  637. control. The setcontext family allows the implementation in C of
  638. advanced control flow patterns such as iterators, fibers, and
  639. coroutines. They may be viewed as an advanced version of
  640. setjmp/longjmp; whereas the latter allows only a single non-local jump
  641. up the stack, setcontext allows the creation of multiple cooperative
  642. threads of control, each with its own stack.
  643. These functions are: setcontext, getcontext, makecontext, swapcontext.
  644. config UCLIBC_SUSV3_LEGACY_MACROS
  645. bool "Enable SuSv3 LEGACY macros"
  646. help
  647. Enable this option if you want to have SuSv3 LEGACY macros.
  648. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  649. WARNING! ABI incompatibility.
  650. config UCLIBC_SUSV4_LEGACY
  651. bool "Enable SuSv4 LEGACY or obsolescent functions"
  652. help
  653. Enable this option if you want to have SuSv4 LEGACY functions
  654. and macros in the library.
  655. Currently applies to:
  656. - XSI functions:
  657. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  658. gettimeofday, isascii, pthread_getconcurrency,
  659. pthread_setconcurrency, setitimer, setpgrp, sighold,
  660. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  661. tempnam, toascii, ulimit.
  662. - Base functions:
  663. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  664. tmpnam, utime.
  665. WARNING! ABI incompatibility.
  666. config UCLIBC_STRICT_HEADERS
  667. bool "Hide structures and constants for unsupported features"
  668. help
  669. Hide structures and constants in headers that should not be used,
  670. because the respective feature is disabled.
  671. WARNING! enabling this option requires to patch many faulty apps,
  672. since they make (wrongly) use of these structures/constants,
  673. although the feature was disabled.
  674. config UCLIBC_HAS_STUBS
  675. bool "Provide stubs for unavailable functionality"
  676. help
  677. With this option uClibc provides non-functional stubs for
  678. functions which are impossible to implement on the target
  679. architecture. Otherwise, such functions are simply omitted.
  680. config UCLIBC_HAS_SHADOW
  681. bool "Shadow Password Support"
  682. default y
  683. help
  684. Answer N if you do not need shadow password support.
  685. Most people will answer Y.
  686. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  687. bool "Support for program_invocation_name"
  688. help
  689. Support for the GNU-specific program_invocation_name and
  690. program_invocation_short_name strings. Some GNU packages
  691. (like tar and coreutils) utilize these for extra useful
  692. output, but in general are not required.
  693. At startup, these external strings are automatically set
  694. up based on the value of ARGV[0].
  695. If unsure, just answer N.
  696. config UCLIBC_HAS___PROGNAME
  697. bool "Support for __progname"
  698. default y
  699. help
  700. Some packages (like openssh) like to peek into internal libc
  701. symbols to make their output a bit more user friendly.
  702. At startup, __progname is automatically set up based on the
  703. value of ARGV[0].
  704. If unsure, just answer N.
  705. config UCLIBC_HAS_PTY
  706. bool "Support for pseudo-terminals"
  707. default y
  708. help
  709. This enables support for pseudo-terminals (see man 4 pts
  710. and man 7 pty).
  711. If unsure, just answer Y.
  712. config ASSUME_DEVPTS
  713. bool "Assume that /dev/pts is a devpts or devfs file system"
  714. default y
  715. depends on UCLIBC_HAS_PTY
  716. help
  717. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  718. these filesystems automatically manage permissions on the /dev/pts
  719. devices. You may need to mount your devpts or devfs filesystem on
  720. /dev/pts for this to work.
  721. Most people should answer Y.
  722. config UNIX98PTY_ONLY
  723. bool "Support only Unix 98 PTYs"
  724. default y
  725. depends on UCLIBC_HAS_PTY
  726. help
  727. If you want to support only Unix 98 PTYs enable this. Some older
  728. applications may need this disabled and will thus use legacy BSD
  729. style PTY handling which is more complex and also bigger than
  730. Unix 98 PTY handling.
  731. For most current programs, you can generally answer Y.
  732. if UNIX98PTY_ONLY
  733. config UCLIBC_HAS_GETPT
  734. bool "Support getpt() (glibc-compat)"
  735. depends on UCLIBC_HAS_PTY
  736. help
  737. Some packages may need getpt().
  738. All of those are non-standard and can be considered
  739. GNU/libc compatibility.
  740. Either use posix_openpt() or just open /dev/ptmx yourself.
  741. If unsure, just say N.
  742. endif
  743. if !UNIX98PTY_ONLY
  744. # Have to use __libc_ptyname{1,2}[] and related bloat
  745. config UCLIBC_HAS_GETPT
  746. def_bool y
  747. endif
  748. config UCLIBC_HAS_LIBUTIL
  749. bool "Provide libutil library and functions"
  750. depends on UCLIBC_HAS_PTY
  751. help
  752. Provide a libutil library.
  753. This non-standard conforming library provides the following
  754. utility functions:
  755. forkpty(): combines openpty(), fork(2), and login_tty() to
  756. create a new process operating in a pseudo-terminal.
  757. login(): write utmp and wtmp entries
  758. login_tty(): prepares for a login on the tty fd by creating a
  759. new session, making fd the controlling terminal for
  760. the calling process, setting fd to be the standard
  761. input, output, and error streams of the current
  762. process, and closing fd.
  763. logout(): write utmp and wtmp entries
  764. logwtmp(): constructs a utmp structure and calls updwtmp() to
  765. append the structure to the utmp file.
  766. openpty(): finds an available pseudo-terminal and returns
  767. file descriptors for the master and slave
  768. This library adds about 3k-4k to your system.
  769. config UCLIBC_HAS_TM_EXTENSIONS
  770. bool "Support 'struct tm' timezone extension fields"
  771. default y
  772. help
  773. Enabling this option adds fields to 'struct tm' in time.h for
  774. tracking the number of seconds east of UTC, and an abbreviation for
  775. the current timezone. These fields are not specified by the SuSv3
  776. standard, but they are commonly used in both GNU and BSD application
  777. code.
  778. To strictly follow the SuSv3 standard, leave this disabled.
  779. Most people will probably want to answer Y.
  780. config UCLIBC_HAS_TZ_CACHING
  781. bool "Enable caching of the last valid timezone 'TZ' string"
  782. default y
  783. help
  784. Answer Y to enable caching of the last valid 'TZ' string describing
  785. the timezone setting. This allows a quick string compare to avoid
  786. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  787. Most people will answer Y.
  788. config UCLIBC_HAS_TZ_FILE
  789. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  790. default y
  791. help
  792. Answer Y to enable the setting of a default timezone for uClibc.
  793. Ordinarily, uClibc gets the timezone information exclusively from the
  794. 'TZ' environment variable. In particular, there is no support for
  795. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  796. With this option enabled, uClibc will use the value stored in the
  797. file '/etc/TZ' (default path) to obtain timezone information if the
  798. 'TZ' environment variable is missing or has an invalid value. The
  799. file consists of a single line (newline required) of text describing
  800. the timezone in the format specified for the TZ environment variable.
  801. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  802. See
  803. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  804. for details on valid settings of 'TZ'.
  805. Most people will answer Y.
  806. config UCLIBC_HAS_TZ_FILE_READ_MANY
  807. bool "Repeatedly read the '/etc/TZ' file"
  808. depends on UCLIBC_HAS_TZ_FILE
  809. default y
  810. help
  811. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  812. a valid value has been read. This incurs the overhead of an
  813. open/read/close for each tzset() call (explicit or implied). However,
  814. setting this will allow applications to update their timezone
  815. information if the contents of the file change.
  816. Most people will answer Y.
  817. config UCLIBC_TZ_FILE_PATH
  818. string "Path to the 'TZ' file for setting the global timezone"
  819. depends on UCLIBC_HAS_TZ_FILE
  820. default "/etc/TZ"
  821. help
  822. This is the path to the 'TZ' file.
  823. Most people will use the default of '/etc/TZ'.
  824. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  825. bool "Use /etc/localtime as a fallback"
  826. depends on UCLIBC_HAS_TZ_FILE
  827. default y
  828. help
  829. Answer Y to try to use /etc/localtime file.
  830. On glibc systems this file (if it is in TZif2 format)
  831. contains timezone string at the end.
  832. Most people will answer Y.
  833. endmenu
  834. menu "Advanced Library Settings"
  835. config UCLIBC_PWD_BUFFER_SIZE
  836. int "Buffer size for getpwnam() and friends"
  837. default 256
  838. range 12 1024
  839. help
  840. This sets the value of the buffer size for getpwnam() and friends.
  841. By default, this is 256. (For reference, glibc uses 1024).
  842. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  843. parameter.
  844. config UCLIBC_GRP_BUFFER_SIZE
  845. int "Buffer size for getgrnam() and friends"
  846. default 256
  847. range 12 1024
  848. help
  849. This sets the value of the buffer size for getgrnam() and friends.
  850. By default, this is 256. (For reference, glibc uses 1024).
  851. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  852. parameter.
  853. comment "Support various families of functions"
  854. config UCLIBC_LINUX_MODULE_26
  855. bool "Linux kernel module functions (2.6)"
  856. default y
  857. help
  858. delete_module, init_module
  859. are used in linux for loadable kernel modules.
  860. Say N if you do not use kernel modules.
  861. config UCLIBC_LINUX_MODULE_24
  862. bool "Linux kernel module functions (<2.6)"
  863. depends on !TARGET_bfin && !TARGET_c6x
  864. help
  865. create_module, query_module
  866. are used in linux (prior to 2.6) for loadable kernel modules.
  867. Say N if you do not use kernel modules, or you only support
  868. Linux 2.6+.
  869. config UCLIBC_LINUX_SPECIFIC
  870. bool "Linux specific functions"
  871. default y
  872. help
  873. accept4(), bdflush(),
  874. capget(), capset(), eventfd(), fallocate(),
  875. fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
  876. madvise(), modify_ldt(), pipe2(), personality(),
  877. prctl()/arch_prctl(), pivot_root(), modify_ldt(),
  878. ppoll(), readahead(), reboot(), remap_file_pages(),
  879. sched_getaffinity(), sched_setaffinity(), sendfile(),
  880. setfsgid(), setfsuid(), setresgid(), setresuid(),
  881. splice(), vmsplice(), tee(), signalfd(), statfs(),
  882. swapoff(), swapon(), sync_file_range(), _sysctl(),
  883. sysinfo(), timerfd_*(), vhangup(), umount(), umount2()
  884. config UCLIBC_HAS_GNU_ERROR
  885. bool "Support GNU extensions for error-reporting"
  886. default y
  887. help
  888. Support for the GNU-specific error(), error_at_line(),
  889. void (* error_print_progname)(), error_message_count
  890. functions and variables. Some GNU packages
  891. utilize these for extra useful output, but in general
  892. are not required.
  893. If unsure, just answer N.
  894. config UCLIBC_BSD_SPECIFIC
  895. bool "BSD specific functions"
  896. default y
  897. help
  898. mincore(), getdomainname(), setdomainname()
  899. If unsure, say N.
  900. config UCLIBC_HAS_BSD_ERR
  901. bool "BSD err functions"
  902. default y
  903. help
  904. These functions are non-standard BSD extensions.
  905. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  906. If unsure, say N.
  907. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  908. bool "BSD obsolete signal functions"
  909. help
  910. These functions are provided as a compatibility interface for
  911. programs that make use of the historical System V signal API.
  912. This API is obsolete:
  913. new applications should use the POSIX signal API (sigaction(2),
  914. sigprocmask(2), etc.).
  915. Affected functions:
  916. sigset(), sighold(), sigrelse(), sigignore()
  917. If unsure, say N.
  918. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  919. bool "SYSV obsolete signal functions"
  920. help
  921. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  922. If unsure, say N.
  923. config UCLIBC_NTP_LEGACY
  924. bool "ntp_*() aliases"
  925. help
  926. Provide legacy aliases for ntp functions:
  927. ntp_adjtime(), ntp_gettime()
  928. It is safe to say N here.
  929. config UCLIBC_SV4_DEPRECATED
  930. bool "Enable SVr4 deprecated functions"
  931. help
  932. These functions are DEPRECATED in System V release 4.
  933. Say N unless you desparately need one of the functions below:
  934. ustat() [use statfs(2) in your code instead]
  935. config UCLIBC_HAS_REALTIME
  936. bool "Realtime-related family of SUSv functions"
  937. default y
  938. help
  939. These functions are part of the Timers option and need not
  940. be available on all implementations.
  941. Includes AIO, message-queue, scheduler, semaphore functions:
  942. aio.h
  943. mqueue.h
  944. sched.h
  945. semaphore.h
  946. aio_cancel()
  947. aio_error()
  948. aio_fsync()
  949. aio_read()
  950. lio_listio()
  951. aio_return()
  952. aio_suspend()
  953. aio_write()
  954. clock_getres(), clock_gettime(), clock_settime()
  955. fdatasync()
  956. mlockall(), munlockall()
  957. mlock(), munlock()
  958. mq_close()
  959. mq_getattr()
  960. mq_notify()
  961. mq_open()
  962. mq_receive()
  963. mq_send()
  964. mq_setattr()
  965. mq_unlink()
  966. nanosleep()
  967. sched_getparam()
  968. sched_get_priority_max(), sched_get_priority_min()
  969. sched_getscheduler()
  970. sched_rr_get_interval()
  971. sched_setparam()
  972. sched_setscheduler()
  973. sem_close()
  974. sem_destroy()
  975. sem_getvalue()
  976. sem_init()
  977. sem_open()
  978. sem_post()
  979. sem_trywait(), sem_wait()
  980. sem_unlink()
  981. sigqueue()
  982. sigtimedwait(), sigwaitinfo()
  983. timer_create()
  984. timer_delete()
  985. timer_getoverrun(), timer_gettime(), timer_settime()
  986. config UCLIBC_HAS_ADVANCED_REALTIME
  987. bool "Advanced realtime-related family of SUSv functions"
  988. default y
  989. depends on UCLIBC_HAS_REALTIME
  990. help
  991. These functions are part of the Timers option and need not
  992. be available on all implementations.
  993. clock_getcpuclockid()
  994. clock_nanosleep()
  995. mq_timedreceive()
  996. mq_timedsend()
  997. posix_fadvise()
  998. posix_fallocate()
  999. posix_madvise()
  1000. posix_memalign()
  1001. posix_mem_offset()
  1002. posix_spawnattr_destroy(), posix_spawnattr_init()
  1003. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  1004. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  1005. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  1006. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  1007. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  1008. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  1009. posix_spawn_file_actions_addclose()
  1010. posix_spawn_file_actions_adddup2()
  1011. posix_spawn_file_actions_addopen()
  1012. posix_spawn_file_actions_destroy()
  1013. posix_spawn_file_actions_init()
  1014. posix_spawn()
  1015. posix_spawnp()
  1016. posix_typed_mem_get_info()
  1017. pthread_mutex_timedlock()
  1018. sem_timedwait()
  1019. #config UCLIBC_HAS_TERMIOS
  1020. # bool "termios functions"
  1021. # default y
  1022. # help
  1023. # Get and set terminal attributes, line control, get and set baud
  1024. # rate.
  1025. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  1026. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  1027. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  1028. #
  1029. # If unsure, say Y.
  1030. config UCLIBC_HAS_EPOLL
  1031. bool "epoll"
  1032. default y
  1033. help
  1034. epoll_create(), epoll_ctl(), epoll_wait() functions.
  1035. config UCLIBC_HAS_XATTR
  1036. bool "Extended Attributes"
  1037. default y
  1038. help
  1039. Extended Attributes support.
  1040. setxattr()
  1041. lsetxattr()
  1042. fsetxattr()
  1043. getxattr()
  1044. lgetxattr()
  1045. fgetxattr()
  1046. listxattr()
  1047. llistxattr()
  1048. flistxattr()
  1049. removexattr()
  1050. lremovexattr()
  1051. fremovexattr()
  1052. Say N unless you need support for extended attributes and the
  1053. filesystems do actually support them.
  1054. config UCLIBC_HAS_PROFILING
  1055. bool "Profiling support"
  1056. default y
  1057. help
  1058. gcc's -finstrument-functions needs these.
  1059. Most people can safely answer N.
  1060. config UCLIBC_HAS_CRYPT_IMPL
  1061. bool "libcrypt support"
  1062. default y
  1063. help
  1064. libcrypt contains crypt(), setkey() and encrypt()
  1065. config UCLIBC_HAS_SHA256_CRYPT_IMPL
  1066. bool "libcrypt SHA256 support"
  1067. depends on UCLIBC_HAS_CRYPT_IMPL
  1068. help
  1069. This adds support for SHA256 password hashing via the crypt() function.
  1070. Say N here if you do not need SHA256 crypt support.
  1071. config UCLIBC_HAS_SHA512_CRYPT_IMPL
  1072. bool "libcrypt SHA512 support"
  1073. depends on UCLIBC_HAS_CRYPT_IMPL
  1074. help
  1075. This adds support for SHA512 password hashing via the crypt() function.
  1076. Say N here if you do not need SHA512 crypt support.
  1077. config UCLIBC_HAS_CRYPT_STUB
  1078. bool "libcrypt stubs"
  1079. default y
  1080. depends on !UCLIBC_HAS_CRYPT_IMPL
  1081. help
  1082. Standards mandate that crypt(3) provides a stub if it is unavailable.
  1083. If you enable this option then stubs for
  1084. crypt(), setkey() and encrypt()
  1085. will be provided in a small libcrypt.
  1086. config UCLIBC_HAS_CRYPT
  1087. def_bool y
  1088. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  1089. endmenu
  1090. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  1091. bool "Networking Support"
  1092. default y
  1093. help
  1094. Say N here if you do not need network support.
  1095. if UCLIBC_HAS_NETWORK_SUPPORT
  1096. config UCLIBC_HAS_SOCKET
  1097. bool "Socket support"
  1098. default y
  1099. help
  1100. If you want to include support for sockets then answer Y.
  1101. config UCLIBC_HAS_IPV4
  1102. bool "IP version 4 support"
  1103. default y
  1104. select UCLIBC_HAS_SOCKET
  1105. help
  1106. If you want to include support for the Internet Protocol
  1107. (IP version 4) then answer Y.
  1108. Most people will say Y.
  1109. config UCLIBC_HAS_IPV6
  1110. bool "IP version 6 support"
  1111. select UCLIBC_HAS_SOCKET
  1112. help
  1113. If you want to include support for the next version of the Internet
  1114. Protocol (IP version 6) then answer Y.
  1115. Most people should answer N.
  1116. config UCLIBC_HAS_RPC
  1117. bool "Remote Procedure Call (RPC) support"
  1118. # RPC+socket-ipvX doesn't currently work.
  1119. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1120. help
  1121. If you want to include RPC support, enable this. RPC is rarely used
  1122. for anything except for the NFS filesystem. Unless you plan to use
  1123. NFS, you can probably leave this set to N and save some space.
  1124. If you need to use NFS then you should answer Y.
  1125. config UCLIBC_HAS_FULL_RPC
  1126. bool "Full RPC support"
  1127. depends on UCLIBC_HAS_RPC
  1128. default y if !HAVE_SHARED
  1129. help
  1130. Normally we enable just enough RPC support for things like rshd and
  1131. nfs mounts to work. If you find you need the rest of the RPC stuff,
  1132. then enable this option. Most people can safely answer N.
  1133. config UCLIBC_HAS_REENTRANT_RPC
  1134. bool "Reentrant RPC support"
  1135. depends on UCLIBC_HAS_RPC
  1136. default y if !HAVE_SHARED
  1137. help
  1138. Most packages utilize the normal (non-reentrant) RPC functions, but
  1139. some (like exportfs from nfs-utils) need these reentrant versions.
  1140. Most people can safely answer N.
  1141. config UCLIBC_USE_NETLINK
  1142. bool "Use netlink to query interfaces"
  1143. depends on UCLIBC_HAS_SOCKET
  1144. help
  1145. In newer versions of Linux (2.4.17+), support was added for querying
  1146. network device information via netlink rather than the old style
  1147. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1148. it is smaller than netlink), but if you find that not all of your
  1149. devices are being returned by the if_nameindex() function, you will
  1150. have to use the netlink implementation.
  1151. Most people can safely answer N.
  1152. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1153. bool "Support the AI_ADDRCONFIG flag"
  1154. depends on UCLIBC_USE_NETLINK
  1155. help
  1156. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1157. implementation using netlink to query interfaces to find both
  1158. ipv4 and ipv6 support. This is only needed if an application uses
  1159. the AI_ADDRCONFIG flag.
  1160. Most people can safely answer N.
  1161. config UCLIBC_HAS_BSD_RES_CLOSE
  1162. bool "Support res_close() (bsd-compat)"
  1163. help
  1164. Answer Y if you desperately want to support BSD compatibility in
  1165. the network code.
  1166. Most people will say N.
  1167. config UCLIBC_HAS_COMPAT_RES_STATE
  1168. bool "Use compatible but bloated _res"
  1169. default y
  1170. help
  1171. Answer Y if you build network utilities and they muck with resolver
  1172. internals a lot (_res global structure). uclibc does not use most
  1173. of _res.XXX fields, and with this option OFF they won't even exist.
  1174. Which will make e.g. dig build fail.
  1175. Answering N saves around 400 bytes in bss.
  1176. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1177. bool "Use extra compatible but extra bloated _res"
  1178. help
  1179. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1180. As far as I can say, this should never be needed.
  1181. config UCLIBC_HAS_RESOLVER_SUPPORT
  1182. bool "DNS resolver functions"
  1183. select UCLIBC_HAS_COMPAT_RES_STATE
  1184. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1185. help
  1186. Provide implementations for DNS resolver functions.
  1187. In particular, the following functions will be added to the
  1188. library:
  1189. ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
  1190. res_mkquery, res_init, res_ninit, res_close, res_nclose
  1191. res_query, res_search, res_querydomain,
  1192. dn_expand, dn_comp,
  1193. ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
  1194. ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
  1195. ns_get16, ns_get32, ns_put16, ns_put32
  1196. config UCLIBC_HAS_LIBRESOLV_STUB
  1197. bool "Provide libresolv stub"
  1198. help
  1199. Provide a dummy resolv library.
  1200. config UCLIBC_HAS_LIBNSL_STUB
  1201. bool "Provide libnsl stub"
  1202. help
  1203. Provide a dummy nsl library.
  1204. endif
  1205. menu "String and Stdio Support"
  1206. config UCLIBC_HAS_STRING_GENERIC_OPT
  1207. bool "Use faster (but larger) generic string functions"
  1208. default y
  1209. help
  1210. Answer Y to use the (tweaked) glibc generic string functions.
  1211. In general, they are faster (but 3-5K larger) than the base
  1212. uClibc string functions which are optimized solely for size.
  1213. Many people will answer Y.
  1214. config UCLIBC_HAS_STRING_ARCH_OPT
  1215. bool "Use arch-specific assembly string functions (where available)"
  1216. default y
  1217. help
  1218. Answer Y to use any archtecture-specific assembly language string
  1219. functions available for this target plaform.
  1220. Note that assembly implementations are not available for all string
  1221. functions, so some generic (written in C) string functions may
  1222. still be used.
  1223. These are small and fast, the only reason _not_ to say Y here is
  1224. for debugging purposes.
  1225. config UCLIBC_HAS_STDIO_FUTEXES
  1226. bool "Use futexes for multithreaded I/O locking"
  1227. depends on UCLIBC_HAS_THREADS_NATIVE
  1228. help
  1229. If you want to compile uClibc to use futexes for low-level
  1230. I/O locking, answer Y. Otherwise, answer N.
  1231. config UCLIBC_HAS_CTYPE_TABLES
  1232. bool "Use Table Versions Of 'ctype.h' Functions."
  1233. default y
  1234. help
  1235. Answer Y to use table versions of the 'ctype.h' functions.
  1236. While the non-table versions are often smaller when building
  1237. statically linked apps, they work only in stub locale mode.
  1238. Most people will answer Y.
  1239. config UCLIBC_HAS_CTYPE_SIGNED
  1240. bool "Support Signed Characters In 'ctype.h' Functions."
  1241. depends on UCLIBC_HAS_CTYPE_TABLES
  1242. default y
  1243. help
  1244. Answer Y to enable support for passing signed char values to
  1245. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1246. these functions are only defined for unsigned char values and
  1247. EOF. However, glibc allows negative signed char values as well
  1248. in order to support 'broken old programs'.
  1249. Most people will answer Y.
  1250. choice
  1251. prompt "ctype argument checking"
  1252. depends on UCLIBC_HAS_CTYPE_TABLES
  1253. default UCLIBC_HAS_CTYPE_UNSAFE
  1254. help
  1255. Please select the invalid arg behavior you want for the 'ctype'
  1256. functions.
  1257. The 'ctype' functions are now implemented using table lookups, with
  1258. the arg being the index. This can result in incorrect memory accesses
  1259. or even segfaults for args outside of the allowed range.
  1260. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1261. the macro implementations.
  1262. config UCLIBC_HAS_CTYPE_UNSAFE
  1263. bool "Do not check -- unsafe"
  1264. config UCLIBC_HAS_CTYPE_CHECKED
  1265. bool "Detect and handle appropriately"
  1266. config UCLIBC_HAS_CTYPE_ENFORCED
  1267. bool "Issue a diagnostic and abort()"
  1268. endchoice
  1269. config UCLIBC_HAS_WCHAR
  1270. bool "Wide Character Support"
  1271. help
  1272. Answer Y to enable wide character support. This will make uClibc
  1273. much larger. It is also currently required for locale support.
  1274. Most people will answer N.
  1275. config UCLIBC_HAS_LOCALE
  1276. bool "Locale Support"
  1277. select UCLIBC_HAS_WCHAR
  1278. select UCLIBC_HAS_CTYPE_TABLES
  1279. help
  1280. uClibc now has full ANSI/ISO C99 locale support (except for
  1281. wcsftime() and collating items in regex). Be aware that enabling
  1282. this option will make uClibc much larger.
  1283. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1284. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1285. uClibc by around 300k. You can reduce this size by building your own
  1286. custom set of locate data (see extra/locale/LOCALES for details).
  1287. uClibc's locale support is still under development. For example,
  1288. codesets using shift states are not currently supported. Support is
  1289. planned in the next iteration of locale support.
  1290. Answer Y to enable locale support. Most people will answer N.
  1291. choice
  1292. prompt "Locale data"
  1293. depends on UCLIBC_HAS_LOCALE
  1294. default UCLIBC_BUILD_ALL_LOCALE
  1295. config UCLIBC_BUILD_ALL_LOCALE
  1296. bool "All locales"
  1297. depends on UCLIBC_HAS_LOCALE
  1298. help
  1299. This builds all the locales that are available on your
  1300. host-box.
  1301. config UCLIBC_BUILD_MINIMAL_LOCALE
  1302. bool "Only selected locales"
  1303. depends on UCLIBC_HAS_LOCALE
  1304. help
  1305. If you do not need all locales that are available on your
  1306. host-box, then set this to 'Y'.
  1307. config UCLIBC_PREGENERATED_LOCALE_DATA
  1308. bool "Use Pre-generated Locale Data"
  1309. depends on UCLIBC_HAS_LOCALE && !TARGET_metag
  1310. help
  1311. Use pre-built locale data.
  1312. Note that these pregenerated locales are sensitive to your
  1313. target architecture (endianess, bitcount).
  1314. Saying N here is highly recommended.
  1315. endchoice
  1316. config UCLIBC_BUILD_MINIMAL_LOCALES
  1317. string "locales to use"
  1318. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1319. default "en_US"
  1320. help
  1321. Space separated list of locales to use.
  1322. E.g.:
  1323. en_US en_GB de_AT
  1324. default:
  1325. en_US
  1326. config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
  1327. bool "Automagically Download the Pre-generated Locale Data (if necessary)"
  1328. depends on UCLIBC_PREGENERATED_LOCALE_DATA
  1329. help
  1330. If you would like the build process to use 'wget' to automatically
  1331. download the pregenerated locale data, enable this option. Otherwise
  1332. you will need to obtain the locale data yourself from:
  1333. http://www.uclibc.org/downloads/uClibc-locale-*.tgz
  1334. and place the uClibc-locale-*.tgz tarball in the extra/locale/
  1335. directory.
  1336. Note that the use of pregenerated locale data is discouraged.
  1337. config UCLIBC_HAS_XLOCALE
  1338. bool "Extended Locale Support (experimental/incomplete)"
  1339. depends on UCLIBC_HAS_LOCALE
  1340. help
  1341. Answer Y to enable extended locale support similar to that provided
  1342. by glibc. This is primarily intended to support libstd++
  1343. functionality.
  1344. However, it also allows thread-specific locale selection via
  1345. uselocale().
  1346. Most people will answer N.
  1347. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1348. bool "Support hexadecimal float notation"
  1349. depends on UCLIBC_HAS_CTYPE_TABLES
  1350. depends on UCLIBC_HAS_FLOATS
  1351. help
  1352. Answer Y to enable support for hexadecimal float notation in the
  1353. (wchar and) char string to floating point conversion functions, as
  1354. well as support for the %a and %A conversion specifiers in the
  1355. *printf() and *scanf() functions.
  1356. Most people will answer N.
  1357. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1358. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1359. depends on UCLIBC_HAS_LOCALE
  1360. depends on UCLIBC_HAS_FLOATS
  1361. help
  1362. Answer Y to enable support for glibc's \"'\" flag for allowing
  1363. locale-specific digit grouping in base 10 integer conversions and
  1364. appropriate floating point conversions in the *printf() and *scanf()
  1365. functions.
  1366. Most people will answer N.
  1367. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1368. bool "Do not require digit grouping when the \"'\" flag is specified"
  1369. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1370. default y
  1371. help
  1372. Answer Y to make digit grouping optional when the \"'\" flag is
  1373. specified.
  1374. This is the standard glibc behavior. If the initial string of digits
  1375. exceeds the maximum group number, the input will be treated as a
  1376. normal non-grouped number.
  1377. Most people will answer N.
  1378. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1379. bool "Support glibc's register_printf_function() (glibc-compat)"
  1380. depends on !USE_OLD_VFPRINTF
  1381. help
  1382. Answer Y to support glibc's register_printf_function() to allow an
  1383. application to add its own printf conversion specifiers.
  1384. parse_printf_format() is also enabled.
  1385. NOTE: Limits the number or registered specifiers to 10.
  1386. NOTE: Requires new conversion specifiers to be ASCII
  1387. characters (0-0x7f). This is to avoid problems with processing
  1388. format strings in locales with different multibyte conversions.
  1389. Most people will answer N.
  1390. config USE_OLD_VFPRINTF
  1391. bool "Use the old vfprintf implementation"
  1392. depends on !UCLIBC_HAS_WCHAR
  1393. help
  1394. Set to true to use the old vfprintf instead of the new. This is
  1395. roughly C89 compliant with some extensions, and is much smaller.
  1396. However, it does not support wide chars, positional args, or glibc
  1397. custom printf specifiers.
  1398. Most people will answer N.
  1399. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1400. int "Maximum number of positional args. Either 0 or >= 9."
  1401. depends on !USE_OLD_VFPRINTF
  1402. default 9
  1403. help
  1404. Set the maximum number of positional args supported by the
  1405. printf/scanf functions. The Single Unix Specification Version 3
  1406. requires a minimum value of 9. Setting this to a value lower than
  1407. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1408. in limits.h to be #undef'd.
  1409. WARNING! The workspace to support positional args is currently
  1410. allocated on the stack. You probably don't want to set
  1411. this to too high a value.
  1412. Most people will answer 9.
  1413. choice
  1414. prompt "Stdio buffer size"
  1415. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1416. help
  1417. Please select a value for BUFSIZ. This will be used by the
  1418. stdio subsystem as the default buffer size for a file, and
  1419. affects fopen(), setvbuf(), etc.
  1420. NOTE: Setting this to 'none' will disable buffering completely.
  1421. However, BUFSIZ will still be defined in stdio.h as 256 because
  1422. many applications use this value.
  1423. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1424. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1425. depends on !UCLIBC_HAS_WCHAR
  1426. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1427. bool "256 (minimum ANSI/ISO C99 value)"
  1428. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1429. bool "512"
  1430. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1431. bool "1024"
  1432. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1433. bool "2048"
  1434. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1435. bool "4096"
  1436. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1437. bool "8192"
  1438. # If you add more choices, you will need to update uClibc_stdio.h.
  1439. endchoice
  1440. choice
  1441. prompt "Stdio builtin buffer size (uClibc-specific)"
  1442. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1443. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1444. help
  1445. When a FILE is created with fopen(), an attempt is made to allocate
  1446. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1447. succeed but the FILE will be unbuffered.
  1448. This option adds a small amount of space to each FILE to act as an
  1449. emergency buffer in the event of a buffer allocation failure.
  1450. Most people will answer None.
  1451. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1452. bool "None"
  1453. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1454. bool "4"
  1455. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1456. bool "8"
  1457. # If you add more choices, you will need to update uClibc_stdio.h.
  1458. endchoice
  1459. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1460. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1461. help
  1462. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1463. a behavioral change made in SUSv3. Previously, abort() was required
  1464. to have the affect of fclose() on all open streams. The wording has
  1465. been changed to "may" from "shall".
  1466. Most people will answer N.
  1467. config UCLIBC_HAS_STDIO_GETC_MACRO
  1468. bool "Provide a macro version of getc()"
  1469. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1470. default y
  1471. help
  1472. Provide a macro version of getc().
  1473. Most people will answer Y.
  1474. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1475. bool "Provide a macro version of putc()"
  1476. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1477. default y
  1478. help
  1479. Provide a macro version of putc().
  1480. Most people will answer Y.
  1481. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1482. bool "Support auto-r/w transition"
  1483. default y
  1484. help
  1485. Answer Y to enable the stdio subsystem to automaticly transition
  1486. between reading and writing. This relaxes the ANSI/ISO C99
  1487. requirement:
  1488. When a file is opened with update mode ('+' as the second or third
  1489. character in the list of mode argument values), both input and output
  1490. may be performed on the associated stream. However, output shall not
  1491. be directly followed by input without an intervening call to the
  1492. fflush function or to a file positioning function (fseek, fsetpos,
  1493. or rewind), and input shall not be directly followed by output without
  1494. an intervening call to a file positioning function, unless the input
  1495. operation encounters end­of­file.
  1496. Most people will answer Y.
  1497. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1498. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1499. depends on UCLIBC_HAS_LFS
  1500. help
  1501. Answer Y to enable a uClibc-specific extension to allow passing an
  1502. additional 'F' flag in the mode string for fopen() to specify that
  1503. the file should be open()ed with the O_LARGEFILE flag set.
  1504. Most people will answer N.
  1505. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1506. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1507. help
  1508. Answer Y to support a glibc extension to allow passing
  1509. additional 'x' flag in the mode string for fopen() to specify that
  1510. the file should be open()ed with the O_EXCL flag set.
  1511. Most people will answer N.
  1512. config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
  1513. bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
  1514. help
  1515. Answer Y to support a glibc extension to allow passing
  1516. additional 'e' flag in the mode string for fopen() to specify that
  1517. the file should be open()ed with the O_CLOEXEC flag set.
  1518. Most people will answer N.
  1519. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1520. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1521. help
  1522. Answer Y to support the glibc 'custom stream' extension functions
  1523. fmemopen(), open_memstream(), and fopencookie().
  1524. NOTE: There are some minor differences regarding seeking behavior.
  1525. Most people will answer N.
  1526. config UCLIBC_HAS_PRINTF_M_SPEC
  1527. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1528. help
  1529. Answer Y to support a glibc extension to interpret '%m' in printf
  1530. format strings as an instruction to output the error message string
  1531. (as generated by strerror) corresponding to the current value of
  1532. 'errno'.
  1533. Most people will answer N.
  1534. config UCLIBC_HAS_ERRNO_MESSAGES
  1535. bool "Include the errno message text in the library"
  1536. default y
  1537. help
  1538. Answer Y if you want to include the errno message text in the
  1539. library. This adds about 3K to the library, but enables strerror()
  1540. to generate text other than 'Unknown error <number>'.
  1541. Most people will answer Y.
  1542. config UCLIBC_HAS_SYS_ERRLIST
  1543. bool "Support sys_errlist[] (obsolete-compat)"
  1544. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1545. help
  1546. Answer Y if you want to support the obsolete sys_errlist[].
  1547. This adds about 0.5k to the library, except for the mips
  1548. arch where it adds over 4K.
  1549. WARNING! In the future, support for sys_errlist[] may be unavailable
  1550. in at least some configurations. In fact, it may be removed
  1551. altogether.
  1552. Most people will answer N.
  1553. Application writers: use the strerror(3) function.
  1554. config UCLIBC_HAS_SIGNUM_MESSAGES
  1555. bool "Include the signum message text in the library"
  1556. default y
  1557. help
  1558. Answer Y if you want to include the signum message text in the
  1559. library. This adds about 0.5K to the library, but enables strsignal()
  1560. to generate text other than 'Unknown signal <number>'.
  1561. Most people will answer Y.
  1562. config UCLIBC_HAS_SYS_SIGLIST
  1563. bool "Support sys_siglist[] (bsd-compat)"
  1564. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1565. help
  1566. Answer Y if you want to support sys_siglist[].
  1567. WARNING! In the future, support for sys_siglist[] may be unavailable
  1568. in at least some configurations. In fact, it may be removed
  1569. altogether.
  1570. Most people will answer N.
  1571. config UCLIBC_HAS_GETTEXT_AWARENESS
  1572. bool "Include gettext awareness"
  1573. depends on UCLIBC_HAS_LOCALE && UCLIBC_MJN3_ONLY
  1574. help
  1575. NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
  1576. Answer Y if you want to include weak stub gettext support and
  1577. make the *strerror*() and strsignal() functions gettext-aware.
  1578. Currently, to get functional gettext functionality you will need
  1579. to use gnu gettext.
  1580. Most people will answer N.
  1581. config UCLIBC_HAS_GNU_GETOPT
  1582. bool "Support gnu getopt"
  1583. default y
  1584. help
  1585. Answer Y if you want to include full gnu getopt() instead of a
  1586. (much smaller) SUSv3 compatible getopt().
  1587. Note that getopt_long, getopt_long_only as well as getsubopt
  1588. are implemented on top of this choice.
  1589. Most people will answer Y.
  1590. config UCLIBC_HAS_GETOPT_LONG
  1591. bool "Support getopt_long/getopt_long_only (glibc-compat)"
  1592. default y
  1593. help
  1594. Answer Y if you want to include getopt_long[_only()] used by many
  1595. apps.
  1596. Most people will answer Y.
  1597. config UCLIBC_HAS_GNU_GETSUBOPT
  1598. bool "Support getsubopt"
  1599. default y
  1600. help
  1601. Answer Y if you want to include getsubopt().
  1602. Most people will answer Y.
  1603. endmenu
  1604. menu "Big and Tall"
  1605. config UCLIBC_HAS_REGEX
  1606. bool "Regular Expression Support"
  1607. default y
  1608. help
  1609. POSIX regular expression code is really big -- 53k all by itself.
  1610. If you don't use regular expressions, turn this off and save space.
  1611. Of course, if you only statically link, leave this on, since it will
  1612. only be included in your apps if you use regular expressions.
  1613. config UCLIBC_HAS_REGEX_OLD
  1614. bool "Use the older (stable) regular expression code"
  1615. depends on UCLIBC_HAS_REGEX
  1616. default y
  1617. help
  1618. There are two versions of regex. The older (stable) version has
  1619. been in uClibc for quite a long time but hasn't seen too many
  1620. updates. It also has some known issues when dealing with uncommon
  1621. corner cases and multibyte/unicode strings. However, it is quite
  1622. a bit smaller than the newer version.
  1623. If the older version has worked for you and you don't need unicode
  1624. support, then stick with the old version (and say Y here).
  1625. Otherwise, you should use the new version (and say N here).
  1626. config UCLIBC_HAS_FNMATCH
  1627. bool "fnmatch Support"
  1628. default y
  1629. help
  1630. POSIX fnmatch.
  1631. config UCLIBC_HAS_FNMATCH_OLD
  1632. bool "Use the older (stable) fnmatch code"
  1633. depends on UCLIBC_HAS_FNMATCH
  1634. default y
  1635. help
  1636. There are two versions of fnmatch. The older (stable) version has
  1637. been in uClibc for quite a long time but hasn't seen too many
  1638. updates. It also has some known issues when dealing with uncommon
  1639. corner cases and multibyte/unicode strings. However, it is quite
  1640. a bit smaller than the newer version.
  1641. If the older version has worked for you and you don't need unicode
  1642. support, then stick with the old version (and say Y here).
  1643. Otherwise, you should use the new version (and say N here).
  1644. config UCLIBC_HAS_WORDEXP
  1645. bool "Support the wordexp() interface"
  1646. depends on UCLIBC_HAS_GLOB
  1647. help
  1648. The SuSv3 wordexp() interface performs word expansions per the Shell
  1649. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1650. intended for use by applications that want to implement all of the
  1651. standard Bourne shell expansions on input data.
  1652. This interface is rarely used, and very large. Unless you have a
  1653. pressing need for wordexp(), you should probably answer N.
  1654. config UCLIBC_HAS_NFTW
  1655. bool "Support the nftw() interface"
  1656. help
  1657. The SuSv3 nftw() interface is used to recursively descend
  1658. directory paths while repeatedly calling a function.
  1659. This interface is rarely used, and adds around 4.5k. Unless you have
  1660. a pressing need for nftw(), you should probably answer N.
  1661. config UCLIBC_HAS_FTW
  1662. bool "Support the ftw() interface (SUSv4-obsolete)"
  1663. depends on UCLIBC_SUSV4_LEGACY
  1664. help
  1665. The SuSv3 ftw() interface is used to recursively descend
  1666. directory paths while repeatedly calling a function.
  1667. This interface is rarely used, and adds around 4.5k. Unless you have
  1668. a pressing need for ftw(), you should probably answer N.
  1669. config UCLIBC_HAS_FTS
  1670. bool "Support the fts() interface (bsd-compat)"
  1671. help
  1672. The fts functions are provided for traversing UNIX file hierarchies.
  1673. This interface is currently used by the elfutils and adds
  1674. around 7.5k.
  1675. You should port your application to use the POSIX nftw()
  1676. interface.
  1677. Unless you need to build/use elfutils, you should prolly answer N.
  1678. config UCLIBC_HAS_GLOB
  1679. bool "Support the glob() interface"
  1680. depends on UCLIBC_HAS_FNMATCH
  1681. default y
  1682. help
  1683. The glob interface is somewhat large (weighing in at about 2,5k). It
  1684. is used fairly often, but is an option since people wanting to go for
  1685. absolute minimum size may wish to omit it.
  1686. Most people will answer Y.
  1687. config UCLIBC_HAS_GNU_GLOB
  1688. bool "Support gnu glob() interface"
  1689. depends on UCLIBC_HAS_GLOB
  1690. help
  1691. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1692. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1693. from glibc and does not support all the GNU specific options.
  1694. Answer Y if you want to include full gnu glob() instead of the smaller
  1695. SUSv3 compatible glob().
  1696. Most people will answer N.
  1697. endmenu
  1698. menu "Library Installation Options"
  1699. config RUNTIME_PREFIX
  1700. string "uClibc runtime library directory"
  1701. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1702. help
  1703. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1704. libraries will be installed. The result will look something
  1705. like the following:
  1706. $(RUNTIME_PREFIX)/
  1707. lib/ <contains all runtime libraries>
  1708. usr/bin/ldd <the ldd utility program>
  1709. sbin/ldconfig <the ldconfig utility program>
  1710. This value is used by the 'make install' Makefile target. Since this
  1711. directory is compiled into the shared library loader, you will need to
  1712. recompile uClibc if you change this value...
  1713. For a typical target system this should be set to "/", such that
  1714. 'make install' will install /lib/libuClibc-<VERSION>.so
  1715. config DEVEL_PREFIX
  1716. string "uClibc development environment directory"
  1717. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1718. help
  1719. DEVEL_PREFIX is the directory into which the uClibc development
  1720. environment will be installed. The result will look something
  1721. like the following:
  1722. $(DEVEL_PREFIX)/
  1723. lib/ <contains static libs>
  1724. include/ <Where all the header files go>
  1725. This value is used by the 'make install' Makefile target when
  1726. installing a uClibc development environment.
  1727. For a typical target system this should be set to "/usr", such that
  1728. 'make install' will install /usr/include/<header files>.
  1729. config MULTILIB_DIR
  1730. string "library path component"
  1731. default "lib"
  1732. help
  1733. Path component where libraries reside.
  1734. For a typical target system this should be set to "lib", such that
  1735. 'make install' will install libraries to "/lib" and "/usr/lib"
  1736. respectively
  1737. DEVEL_PREFIX/MULTILIB_DIR
  1738. RUNTIME_PREFIX/MULTILIB_DIR
  1739. Other settings may include "lib32" or "lib64".
  1740. config HARDWIRED_ABSPATH
  1741. bool "Hardwire absolute paths into linker scripts"
  1742. default y
  1743. help
  1744. This prepends absolute paths to the libraries mentioned in linker
  1745. scripts such as libc.so.
  1746. This is a build time optimization. It has no impact on dynamic
  1747. linking at runtime, which doesn't use linker scripts.
  1748. You must disable this to use uClibc with old non-sysroot toolchains,
  1749. such as the prebuilt binary cross compilers at:
  1750. http://uclibc.org/downloads/binaries
  1751. The amount of time saved by this optimization is actually too small to
  1752. measure. The linker just had to search the library path to find the
  1753. linker script, so the dentries are cache hot if it has to search the
  1754. same path again. But it's what glibc does, so we do it too.
  1755. endmenu
  1756. menu "Security options"
  1757. config UCLIBC_BUILD_PIE
  1758. bool "Build utilities as ET_DYN/PIE executables"
  1759. depends on HAVE_SHARED
  1760. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
  1761. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1762. help
  1763. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1764. executables.
  1765. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1766. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1767. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1768. all libraries have to be built with -fPIC or -fpic, and all
  1769. assembler functions must be written as position independent
  1770. code (PIC).
  1771. config UCLIBC_HAS_ARC4RANDOM
  1772. bool "Include the arc4random() function"
  1773. help
  1774. Answer Y to support the OpenBSD-like arc4random() function. This
  1775. function picks a random number between 0 and N, and will always return
  1776. something even if the random driver is dead. If urandom fails then
  1777. gettimeofday(2) will be used as the random seed. This function is
  1778. designed to be more dependable than invoking /dev/urandom directly.
  1779. OpenSSL and OpenNTPD currently support this function.
  1780. Most people will answer N.
  1781. config ARC4RANDOM_USES_NODEV
  1782. bool "Do not use /dev/urandom with arc4random()"
  1783. depends on UCLIBC_HAS_ARC4RANDOM
  1784. help
  1785. Answer Y to use gettimeofday(2) and getpid(2) exclusively for
  1786. arc4random(). This is not a bad idea for a diskless system, but
  1787. it uses a lot of syscalls to stir each array element.
  1788. Most people will answer N.
  1789. config HAVE_NO_SSP
  1790. bool
  1791. config UCLIBC_HAS_SSP
  1792. bool "Support for GCC stack smashing protector"
  1793. depends on !HAVE_NO_SSP
  1794. help
  1795. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1796. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1797. the needed functions are added to ldso/libc instead.
  1798. GCC's stack protector is a reimplementation of IBM's propolice.
  1799. See http://www.trl.ibm.com/projects/security/ssp/ and
  1800. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1801. for details.
  1802. Note that NOEXECSTACK on a kernel with address space randomization
  1803. is generally sufficient to prevent most buffer overflow exploits
  1804. without increasing code size. This option essentially adds debugging
  1805. code to catch them.
  1806. Most people will answer N.
  1807. config UCLIBC_HAS_SSP_COMPAT
  1808. bool "Support for gcc-3.x propolice smashing stack protector"
  1809. depends on UCLIBC_HAS_SSP
  1810. help
  1811. Add gcc-3.x propolice smashing stack protector to the library.
  1812. This requires a patched version of GCC, supporting the
  1813. -fstack-protector[-all] options, with the __guard and
  1814. __stack_smash_handler functions removed from libgcc.
  1815. These functions are added to ldso/libc instead.
  1816. More information at:
  1817. <http://www.research.ibm.com/trl/projects/security/ssp/>
  1818. Most people will answer N.
  1819. config SSP_QUICK_CANARY
  1820. bool "Use simple guard values without accessing /dev/urandom"
  1821. depends on UCLIBC_HAS_SSP
  1822. help
  1823. Use gettimeofday(2) to define the __guard without accessing
  1824. /dev/urandom.
  1825. WARNING: This makes smashing stack protector vulnerable to timing
  1826. attacks.
  1827. Most people will answer N.
  1828. choice
  1829. prompt "Propolice protection blocking signal"
  1830. depends on UCLIBC_HAS_SSP
  1831. depends on DODEBUG
  1832. default PROPOLICE_BLOCK_SEGV
  1833. help
  1834. "abort" use SIGABRT to block offending programs.
  1835. This is the default implementation.
  1836. "segfault" use SIGSEGV to block offending programs.
  1837. Use this for debugging.
  1838. If unsure, answer "abort".
  1839. config PROPOLICE_BLOCK_ABRT
  1840. bool "abort"
  1841. config PROPOLICE_BLOCK_SEGV
  1842. bool "segfault"
  1843. endchoice
  1844. config UCLIBC_BUILD_SSP
  1845. bool "Build uClibc with -fstack-protector"
  1846. depends on UCLIBC_HAS_SSP
  1847. help
  1848. Build all uClibc libraries and executables with -fstack-protector,
  1849. adding extra stack overflow checking to most uClibc functions.
  1850. config UCLIBC_BUILD_RELRO
  1851. bool "Build uClibc with linker option -z RELRO"
  1852. depends on HAVE_SHARED
  1853. default y
  1854. help
  1855. Build all libraries and executables with "ld -z relro".
  1856. This tells the linker to mark chunks of an executable or shared
  1857. library read-only after applying dynamic relocations. (This comes
  1858. up when a global const variable is initialized to the address of a
  1859. function or the value of another global variable.)
  1860. This is a fairly obscure option the ld man page doesn't even bother
  1861. to document properly. It's a security paranoia issue that's more
  1862. likely to consume memory (by allocating an extra page) rather than
  1863. save it.
  1864. This is explained in more depth at
  1865. http://www.airs.com/blog/archives/189
  1866. Nobody is likely to care whether you say Y or N here.
  1867. config UCLIBC_BUILD_NOW
  1868. bool "Build uClibc with linker option -z NOW"
  1869. depends on HAVE_SHARED
  1870. help
  1871. Build all libraries and executables with "ld -z now".
  1872. This tells the linker to resolve all symbols when the library is
  1873. first loaded, rather than when each function is first called. This
  1874. increases start-up latency by a few microseconds and may do
  1875. unnecessary work (resolving symbols that are never used), but the
  1876. realtime people like it for making microbenchmark timings slightly
  1877. more predictable and in some cases it can be slightly faster due to
  1878. CPU cache behavior (not having to fault the linker back in to do
  1879. lazy symbol resolution).
  1880. Most people can't tell the difference between selecting Y or N here.
  1881. config UCLIBC_BUILD_NOEXECSTACK
  1882. bool "Build uClibc with noexecstack marking"
  1883. default y
  1884. help
  1885. Mark all assembler files as noexecstack, which will mark uClibc
  1886. as not requiring an executable stack. (This doesn't prevent other
  1887. files you link against from claiming to need an executable stack, it
  1888. just won't cause uClibc to request it unnecessarily.)
  1889. This is a security thing to make buffer overflows harder to exploit.
  1890. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1891. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1892. It only actually provides any security when combined with address
  1893. space randomization, explained here: http://lwn.net/Articles/121845/
  1894. Address space randomization is on by default in current linux
  1895. kernels (although it can be disabled using the option
  1896. CONFIG_COMPAT_BRK).
  1897. You should probably say Y.
  1898. endmenu
  1899. menu "Development/debugging options"
  1900. config CROSS_COMPILER_PREFIX
  1901. string "Cross-compiling toolchain prefix"
  1902. default ""
  1903. help
  1904. The prefix used to execute your cross-compiling toolchain. For
  1905. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1906. then enter 'arm-linux-uclibc-' here.
  1907. config UCLIBC_EXTRA_CFLAGS
  1908. string "Extra CFLAGS"
  1909. default ""
  1910. help
  1911. Add any additional CFLAGS to be used to build uClibc.
  1912. config DODEBUG
  1913. bool "Enable debugging symbols"
  1914. select EXTRA_WARNINGS
  1915. help
  1916. Say Y here if you wish to compile uClibc with debugging symbols.
  1917. This will allow you to use a debugger to examine uClibc internals
  1918. while applications are running. This increases the size of the
  1919. library considerably and should only be used when doing development.
  1920. If you are doing development and want to debug uClibc, answer Y.
  1921. Otherwise, answer N.
  1922. config DODEBUG_PT
  1923. bool "Build pthread with debugging output"
  1924. depends on UCLIBC_HAS_THREADS && LINUXTHREADS_OLD
  1925. help
  1926. Enable debug output in libpthread. This is only useful when doing
  1927. development in libpthread itself.
  1928. Otherwise, answer N.
  1929. config DOSTRIP
  1930. bool "Strip libraries and executables"
  1931. default y
  1932. depends on !DODEBUG
  1933. help
  1934. Say Y here if you do wish to strip all uClibc libraries and
  1935. executables. No stripping increases the size of the binaries
  1936. considerably, but makes it possible to debug uClibc libraries.
  1937. Most people will answer Y.
  1938. config DOASSERTS
  1939. bool "Build with run-time assertion testing"
  1940. help
  1941. Say Y here to include runtime assertion tests.
  1942. This enables runtime assertion testing in some code, which can
  1943. increase the size of the library and incur runtime overhead.
  1944. If you say N, then this testing will be disabled.
  1945. config SUPPORT_LD_DEBUG
  1946. bool "Build the shared library loader with debugging support"
  1947. depends on HAVE_SHARED
  1948. help
  1949. Answer Y here to enable all the extra code needed to debug the uClibc
  1950. native shared library loader. The level of debugging noise that is
  1951. generated depends on the LD_DEBUG environment variable... Just set
  1952. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1953. debug your application. Diagnostic messages will then be printed to
  1954. the stderr.
  1955. For now these debugging tokens are available:
  1956. detail provide more information for some options
  1957. move display copy processing
  1958. symbols display symbol table processing
  1959. reloc display relocation processing; detail shows the
  1960. relocation patch
  1961. nofixups never fixes up jump relocations
  1962. bindings displays the resolve processing (function calls);
  1963. detail shows the relocation patch
  1964. all Enable everything!
  1965. The additional environment variable:
  1966. LD_DEBUG_OUTPUT=file
  1967. redirects the diagnostics to an output file created using
  1968. the specified name and the process id as a suffix.
  1969. An excellent start is simply:
  1970. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1971. or to log everything to a file named 'logfile', try this
  1972. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1973. If you are doing development and want to debug uClibc's shared library
  1974. loader, answer Y. Mere mortals answer N.
  1975. config SUPPORT_LD_DEBUG_EARLY
  1976. bool "Build the shared library loader with early debugging support"
  1977. depends on HAVE_SHARED
  1978. help
  1979. Answer Y here to if you find the uClibc shared library loader is
  1980. crashing or otherwise not working very early on. This is typical
  1981. only when starting a new port when you haven't figured out how to
  1982. properly get the values for argc, argv, environ, etc. This method
  1983. allows a degree of visibility into the very early shared library
  1984. loader initialization process. If you are doing development and want
  1985. to debug the uClibc shared library loader early initialization,
  1986. answer Y. Mere mortals answer N.
  1987. config UCLIBC_MALLOC_DEBUGGING
  1988. bool "Build malloc with debugging support"
  1989. depends on MALLOC || MALLOC_STANDARD
  1990. select DOASSERTS
  1991. help
  1992. Answer Y here to compile extra debugging support code into malloc.
  1993. Malloc debugging output may then be enabled at runtime using the
  1994. MALLOC_DEBUG environment variable.
  1995. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1996. as a bitmask with the following bits:
  1997. 1 - do extra consistency checking
  1998. 2 - output messages for malloc/free calls and OS
  1999. allocation calls
  2000. 4 - output messages for the `MMB' layer
  2001. 8 - output messages for internal malloc heap manipulation
  2002. calls
  2003. Because this increases the size of malloc appreciably (due to strings
  2004. etc), you should say N unless you need to debug a malloc problem.
  2005. config UCLIBC_HAS_BACKTRACE
  2006. bool "Add support for application self-debugging"
  2007. depends on HAVE_SHARED
  2008. help
  2009. Answer Y here to compile support for application self-debugging, by adding
  2010. a new shared object "libubacktrace.so" that provides the following new
  2011. functions:
  2012. backtrace, backtrace_symbols, backtrace_symbols_fd
  2013. The backtrace functionality is currently supported on SH platform, and it
  2014. based on dwarf2 informations to properly work, so any application that
  2015. want to use backtrace needs to be built with -fexceptions flag.
  2016. The symbol names may be unavailable without the use of special linker
  2017. options. For systems using the GNU linker, it is necessary to use the
  2018. -rdynamic linker option too. Note that names of "static" functions are not
  2019. exposed, and won't be available in the backtrace.
  2020. config WARNINGS
  2021. string "Compiler Warnings"
  2022. default "-Wall"
  2023. help
  2024. Set this to the set of compiler warnings you wish to see while compiling.
  2025. config EXTRA_WARNINGS
  2026. bool "Enable extra annoying warnings"
  2027. help
  2028. If you wish to build with extra warnings enabled, say Y here.
  2029. config DOMULTI
  2030. bool "Compile all sources at once into an object"
  2031. help
  2032. Set this to compile all sources at once into an object (IMA).
  2033. This mode of compilation uses alot of memory but may produce
  2034. smaller binaries.
  2035. Note that you need a very recent GCC for this to work, like
  2036. gcc >= 4.3 plus eventually some patches.
  2037. If unsure, keep the default of N.
  2038. endmenu