Config.in 74 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_nds32 if DESIRED_TARGET_ARCH = "nds32"
  31. default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
  32. default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
  33. default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
  34. default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
  35. default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
  36. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  37. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  38. help
  39. The architecture of your target.
  40. config TARGET_alpha
  41. bool "alpha"
  42. config TARGET_arc
  43. bool "arc"
  44. config TARGET_arm
  45. bool "arm"
  46. config TARGET_avr32
  47. bool "avr32"
  48. config TARGET_bfin
  49. bool "bfin"
  50. # someone could sync this tree:
  51. # http://linux-c6x.org/git/?p=uClibc.git;a=summary
  52. config TARGET_c6x
  53. bool "c6x"
  54. config TARGET_cris
  55. bool "cris"
  56. config TARGET_frv
  57. bool "frv"
  58. config TARGET_h8300
  59. bool "h8300"
  60. config TARGET_hppa
  61. bool "hppa"
  62. config TARGET_i386
  63. bool "i386"
  64. config TARGET_ia64
  65. bool "ia64"
  66. config TARGET_lm32
  67. bool "lm32"
  68. config TARGET_m68k
  69. bool "m68k"
  70. config TARGET_metag
  71. bool "metag"
  72. config TARGET_microblaze
  73. bool "microblaze"
  74. config TARGET_mips
  75. bool "mips"
  76. config TARGET_nds32
  77. bool "nds32"
  78. config TARGET_nios2
  79. bool "nios2"
  80. config TARGET_or1k
  81. bool "or1k"
  82. config TARGET_powerpc
  83. bool "powerpc"
  84. config TARGET_sh
  85. bool "superh"
  86. config TARGET_sparc
  87. bool "sparc"
  88. config TARGET_x86_64
  89. bool "x86_64"
  90. config TARGET_xtensa
  91. bool "xtensa"
  92. endchoice
  93. menu "Target Architecture Features and Options"
  94. if TARGET_alpha
  95. source "extra/Configs/Config.alpha"
  96. endif
  97. if TARGET_arm
  98. source "extra/Configs/Config.arm"
  99. endif
  100. if TARGET_avr32
  101. source "extra/Configs/Config.avr32"
  102. endif
  103. if TARGET_bfin
  104. source "extra/Configs/Config.bfin"
  105. endif
  106. if TARGET_cris
  107. source "extra/Configs/Config.cris"
  108. endif
  109. if TARGET_frv
  110. source "extra/Configs/Config.frv"
  111. endif
  112. if TARGET_h8300
  113. source "extra/Configs/Config.h8300"
  114. endif
  115. if TARGET_hppa
  116. source "extra/Configs/Config.hppa"
  117. endif
  118. if TARGET_i386
  119. source "extra/Configs/Config.i386"
  120. endif
  121. if TARGET_ia64
  122. source "extra/Configs/Config.ia64"
  123. endif
  124. if TARGET_lm32
  125. source "extra/Configs/Config.lm32"
  126. endif
  127. if TARGET_m68k
  128. source "extra/Configs/Config.m68k"
  129. endif
  130. if TARGET_metag
  131. source "extra/Configs/Config.metag"
  132. endif
  133. if TARGET_nds32
  134. source "extra/Configs/Config.nds32"
  135. endif
  136. if TARGET_nios2
  137. source "extra/Configs/Config.nios2"
  138. endif
  139. if TARGET_microblaze
  140. source "extra/Configs/Config.microblaze"
  141. endif
  142. if TARGET_mips
  143. source "extra/Configs/Config.mips"
  144. endif
  145. if TARGET_or1k
  146. source "extra/Configs/Config.or1k"
  147. endif
  148. if TARGET_powerpc
  149. source "extra/Configs/Config.powerpc"
  150. endif
  151. if TARGET_sh
  152. source "extra/Configs/Config.sh"
  153. endif
  154. if TARGET_sparc
  155. source "extra/Configs/Config.sparc"
  156. endif
  157. if TARGET_x86_64
  158. source "extra/Configs/Config.x86_64"
  159. endif
  160. if TARGET_xtensa
  161. source "extra/Configs/Config.xtensa"
  162. endif
  163. if TARGET_c6x
  164. source "extra/Configs/Config.c6x"
  165. endif
  166. if TARGET_arc
  167. source "extra/Configs/Config.arc"
  168. endif
  169. config TARGET_SUBARCH
  170. string
  171. default "e500" if CONFIG_E500
  172. default "classic" if CONFIG_CLASSIC
  173. default "sh4" if CONFIG_SH4
  174. default "sh4" if CONFIG_SH4A
  175. default "" if CONFIG_386
  176. default "i486" if CONFIG_486
  177. default "i586" if CONFIG_586
  178. default "i686" if CONFIG_686
  179. default "arcv2" if CONFIG_ARC_CPU_HS
  180. default ""
  181. source "extra/Configs/Config.in.arch"
  182. endmenu
  183. menu "General Library Settings"
  184. config HAVE_NO_PIC
  185. bool
  186. config DOPIC
  187. bool "Generate only Position Independent Code (PIC)"
  188. default y
  189. depends on !HAVE_NO_PIC
  190. help
  191. If you wish to build all of uClibc as PIC objects, then answer Y here.
  192. If you are unsure, then you should answer N.
  193. config ARCH_HAS_NO_SHARED
  194. bool
  195. config ARCH_HAS_NO_LDSO
  196. bool
  197. select ARCH_HAS_NO_SHARED
  198. config ARCH_HAS_UCONTEXT
  199. bool
  200. config HAVE_SHARED
  201. bool "Enable shared libraries"
  202. depends on !ARCH_HAS_NO_SHARED
  203. default y
  204. help
  205. If you wish to build uClibc with support for shared libraries then
  206. answer Y here. If you only want to build uClibc as a static library,
  207. then answer N.
  208. config FORCE_SHAREABLE_TEXT_SEGMENTS
  209. bool "Only load shared libraries which can share their text segment"
  210. depends on HAVE_SHARED
  211. select DOPIC
  212. help
  213. If you answer Y here, the uClibc native shared library loader will
  214. only load shared libraries, which do not need to modify any
  215. non-writable segments. These libraries haven't set the DT_TEXTREL
  216. tag in the dynamic section (==> objdump).
  217. All your libraries must be compiled with -fPIC or -fpic, and all
  218. assembler function must be written as position independent code (PIC).
  219. Enabling this option will make uClibc's shared library loader a
  220. little bit smaller and guarantee that no memory will be wasted by
  221. badly coded shared libraries.
  222. config LDSO_LDD_SUPPORT
  223. bool "Native 'ldd' support"
  224. depends on HAVE_SHARED
  225. default y
  226. help
  227. Enable all the code needed to support traditional ldd,
  228. which executes the shared library loader to resolve all dependencies
  229. and then provide a list of shared libraries that are required for an
  230. application to function. Disabling this option will make uClibc's
  231. shared library loader a little bit smaller.
  232. Most people will answer Y.
  233. config LDSO_CACHE_SUPPORT
  234. bool "Enable library loader cache (ld.so.conf)"
  235. depends on HAVE_SHARED
  236. default y
  237. help
  238. Enable this to make use of /etc/ld.so.conf, the shared library loader
  239. cache configuration file to support for non-standard library paths.
  240. After updating this file, it is necessary to run 'ldconfig' to update
  241. the /etc/ld.so.cache shared library loader cache file.
  242. config LDSO_PRELOAD_ENV_SUPPORT
  243. bool "Enable library loader LD_PRELOAD environment"
  244. depends on HAVE_SHARED
  245. default y
  246. help
  247. Enable this to make use of LD_PRELOAD environment variable.
  248. A whitespace-separated list of additional, user-specified, ELF shared
  249. libraries to be loaded before all others. This can be used to
  250. selectively override functions in other shared libraries. For
  251. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  252. search directories that are also set-user-ID will be loaded.
  253. config LDSO_PRELOAD_FILE_SUPPORT
  254. bool "Enable library loader preload file (ld.so.preload)"
  255. depends on HAVE_SHARED
  256. help
  257. Enable this to make use of /etc/ld.so.preload. This file contains a
  258. whitespace separated list of shared libraries to be loaded before
  259. the program.
  260. config LDSO_BASE_FILENAME
  261. string "Shared library loader naming prefix"
  262. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  263. default "ld.so"
  264. help
  265. If you wish to support both uClibc and glibc on the same system, it
  266. is necessary to set this to something other than "ld.so" to avoid
  267. conflicts with glibc, which also uses "ld.so". This prevents both
  268. libraries from using the same /etc/ld.so.* files. If you wish to
  269. support both uClibc and glibc on the same system then you should set
  270. this to "ld-uClibc.so".
  271. Most people will leave this set to the default of "ld.so".
  272. WARNING: Changing the default prefix could cause problems with
  273. binutils' ld !
  274. config LDSO_STANDALONE_SUPPORT
  275. bool "Dynamic linker stand-alone mode support"
  276. depends on HAVE_SHARED
  277. help
  278. The dynamic linker can be run either indirectly through running some
  279. dynamically linked program or library (in which case no command line
  280. options to the dynamic linker can be passed and, in the ELF case, the
  281. dynamic linker which is stored in the .interp section of the program
  282. is executed) or directly by running:
  283. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  284. Stand-alone execution is a prerequisite for adding prelink
  285. capabilities to uClibc dynamic linker, as well useful for testing an
  286. updated version of the dynamic linker without breaking the system.
  287. config LDSO_PRELINK_SUPPORT
  288. bool "Dynamic linker prelink support"
  289. depends on HAVE_SHARED
  290. select LDSO_STANDALONE_SUPPORT
  291. help
  292. The dynamic linker can be used in stand-alone mode by the prelink tool
  293. for prelinking ELF shared libraries and binaries to speed up startup
  294. time. It also is able to load and handle prelinked libraries and
  295. binaries at runtime.
  296. config UCLIBC_STATIC_LDCONFIG
  297. bool "Link ldconfig statically"
  298. depends on HAVE_SHARED
  299. default y
  300. help
  301. Enable this option to statically link the ldconfig binary.
  302. Making ldconfig static can be beneficial if you have a library
  303. problem and need to use ldconfig to recover. Sometimes it is
  304. preferable to instead keep the size of the system down, in which
  305. case you should disable this option.
  306. config LDSO_RUNPATH
  307. bool "Enable ELF RUNPATH tag support"
  308. depends on HAVE_SHARED
  309. default y if LDSO_CACHE_SUPPORT
  310. help
  311. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  312. which extend the library search paths. They are really only useful
  313. if a package installs libraries in non standard locations and
  314. ld.so.conf support is disabled.
  315. Usage of RUNPATH tags is not too common, so disabling this feature
  316. should be safe for most people.
  317. config LDSO_RUNPATH_OF_EXECUTABLE
  318. bool "Use executables RUNPATH/RPATH when searching for libraries."
  319. depends on LDSO_RUNPATH
  320. default n
  321. help
  322. Use the executables RUNPATH/RPATH to find to find libraries even
  323. though this behavour is not standard. Setting this option causes
  324. the uclibc dynamic linker behavour to match the glibc dynamic linker.
  325. config LDSO_SAFE_RUNPATH
  326. bool "Allow only RUNPATH beginning with /"
  327. depends on LDSO_RUNPATH
  328. default y
  329. help
  330. Allow only absolute path in RPATH/RUNPATH.
  331. config LDSO_SEARCH_INTERP_PATH
  332. bool "Add ldso path to lib search path"
  333. depends on HAVE_SHARED
  334. default y
  335. help
  336. The ldso is told where it is being executed from and can use that
  337. path to find related core libraries. This is useful by default,
  338. but can be annoying in a mixed development environment.
  339. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  340. library search with /foo/boo/
  341. If unsure, simply say Y here.
  342. config LDSO_LD_LIBRARY_PATH
  343. bool "Add LD_LIBRARY_PATH to lib search path"
  344. depends on HAVE_SHARED
  345. default y
  346. help
  347. On hardened system it could be useful to disable the use of
  348. LD_LIBRARY_PATH environment variable (a colon-separated list of
  349. directories in which to search for ELF libraries at execution-time).
  350. If unsure, simply say Y here.
  351. config LDSO_NO_CLEANUP
  352. bool "Disable automatic unloading of dynamically loaded shared objects"
  353. depends on HAVE_SHARED
  354. help
  355. If you need complete allocation traces when debugging memory leaks
  356. using Valgrind in a process that dynamically loads shared objects,
  357. then answer Y here. Unlike glibc, uClibc unloads all dynamically
  358. loaded shared objects when a process exits, which prevents Valgrind
  359. from correctly resolving the symbols from the unloaded shared objects.
  360. Unless you know you need this, you should answer N.
  361. config UCLIBC_CTOR_DTOR
  362. bool
  363. default y
  364. help
  365. If you wish to build uClibc with support for global constructor
  366. (ctor) and global destructor (dtor) support, then answer Y here.
  367. When ctor/dtor support is enabled, binaries linked with uClibc must
  368. also be linked with crtbegin.o and crtend.o which are provided by gcc
  369. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  370. may need to be adjusted to include these files). This support will
  371. also add a small amount of additional size to each binary compiled vs
  372. uClibc. If you will be using uClibc with C++, or if you need the gcc
  373. __attribute__((constructor)) and __attribute__((destructor)) to work,
  374. then you definitely want to answer Y here. If you don't need ctors
  375. or dtors and want your binaries to be as small as possible, then
  376. answer N.
  377. config LDSO_GNU_HASH_SUPPORT
  378. bool "Enable GNU hash style support"
  379. depends on HAVE_SHARED
  380. help
  381. Newest binutils support a new hash style named GNU-hash. The dynamic
  382. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  383. if present into the ELF binaries, otherwise it will use the old SysV
  384. hash style (.hash). This ensures that it is completely backward
  385. compatible.
  386. Further, being the hash table implementation self-contained into each
  387. executable and shared libraries, objects with mixed hash style can
  388. peacefully coexist in the same process.
  389. If you want to use this new feature, answer Y
  390. choice
  391. prompt "Thread support"
  392. default HAS_NO_THREADS
  393. help
  394. If you want to compile uClibc with pthread support, then answer Y.
  395. This will increase the size of uClibc by adding a bunch of locking
  396. to critical data structures, and adding extra code to ensure that
  397. functions are properly reentrant.
  398. config HAS_NO_THREADS
  399. bool "none"
  400. help
  401. Disable thread support.
  402. config UCLIBC_HAS_LINUXTHREADS
  403. bool "Linuxthreads"
  404. # linuxthreads need nanosleep()
  405. select UCLIBC_HAS_REALTIME
  406. depends on !TARGET_metag
  407. help
  408. If you want to compile uClibc with Linuxthreads support, then answer Y.
  409. config UCLIBC_HAS_THREADS_NATIVE
  410. bool "Native POSIX Threading (NPTL)"
  411. select UCLIBC_HAS_TLS
  412. select UCLIBC_HAS_STDIO_FUTEXES
  413. select UCLIBC_HAS_REALTIME
  414. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  415. depends on !CONFIG_386 && \
  416. !TARGET_alpha && \
  417. !TARGET_avr32 && \
  418. !TARGET_bfin && \
  419. !TARGET_c6x && \
  420. !TARGET_cris && \
  421. !TARGET_frv && \
  422. !TARGET_h8300 && \
  423. !TARGET_hppa && \
  424. !TARGET_ia64 && \
  425. !TARGET_m68k && \
  426. !TARGET_nds32 && \
  427. !TARGET_or1k && \
  428. ARCH_USE_MMU
  429. help
  430. If you want to compile uClibc with NPTL support, then answer Y.
  431. endchoice
  432. config UCLIBC_HAS_THREADS
  433. def_bool y if !HAS_NO_THREADS
  434. config UCLIBC_HAS_TLS
  435. bool "Thread-Local Storage"
  436. depends on UCLIBC_HAS_THREADS_NATIVE
  437. help
  438. If you want to enable TLS support then answer Y.
  439. This is fast an efficient way to store per-thread local data
  440. which is not on stack. It needs __thread support enabled in
  441. gcc.
  442. config PTHREADS_DEBUG_SUPPORT
  443. bool "Build pthreads debugging support"
  444. depends on UCLIBC_HAS_THREADS
  445. help
  446. Say Y here if you wish to be able to debug applications that use
  447. uClibc's pthreads library. By enabling this option, a library
  448. named libthread_db will be built. This library will be dlopen()'d
  449. by gdb and will allow gdb to debug the threads in your application.
  450. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  451. you must compile gdb with uClibc in order for pthread debugging to
  452. work properly.
  453. If you are doing development and want to debug applications using
  454. uClibc's pthread library, answer Y. Otherwise, answer N.
  455. config UCLIBC_HAS_SYSLOG
  456. bool "Syslog support"
  457. default y
  458. depends on UCLIBC_HAS_NETWORK_SUPPORT
  459. select UCLIBC_HAS_SOCKET
  460. help
  461. Support sending messages to the system logger.
  462. This requires socket-support.
  463. choice
  464. prompt "Malloc Implementation"
  465. default MALLOC if ! ARCH_USE_MMU
  466. default MALLOC_STANDARD if ARCH_USE_MMU
  467. config MALLOC
  468. bool "malloc"
  469. help
  470. "malloc" use mmap for all allocations and so works very well on
  471. MMU-less systems that do not support the brk() system call. It is
  472. pretty smart about reusing already allocated memory, and minimizing
  473. memory wastage.
  474. This is the default for uClinux MMU-less systems.
  475. config MALLOC_SIMPLE
  476. bool "malloc-simple"
  477. help
  478. "malloc-simple" is trivially simple and slow as molasses. It
  479. was written from scratch for uClibc, and is the simplest possible
  480. (and therefore smallest) malloc implementation.
  481. This uses only the mmap() system call to allocate and free memory,
  482. and does not use the brk() system call at all, making it a fine
  483. choice for MMU-less systems with very limited memory. It's 100%
  484. standards compliant, thread safe, very small, and releases freed
  485. memory back to the OS immediately rather than keeping it in the
  486. process's heap for reallocation. It is also VERY SLOW.
  487. config MALLOC_STANDARD
  488. bool "malloc-standard"
  489. depends on ARCH_USE_MMU
  490. help
  491. "malloc-standard" is derived from the public domain dlmalloc
  492. implementation by Doug Lea. It is quite fast, and is pretty smart
  493. about reusing already allocated memory, and minimizing memory
  494. wastage. This uses brk() for small allocations, while using mmap()
  495. for larger allocations. This is the default malloc implementation
  496. for uClibc.
  497. If unsure, answer "malloc-standard".
  498. endchoice
  499. config MALLOC_GLIBC_COMPAT
  500. bool "Malloc returns live pointer for malloc(0)"
  501. help
  502. The behavior of malloc(0) is listed as implementation-defined by
  503. SuSv3. Glibc returns a valid pointer to something, while uClibc
  504. normally returns NULL. I personally feel glibc's behavior is
  505. not particularly safe, and allows buggy applications to hide very
  506. serious problems.
  507. When this option is enabled, uClibc will act just like glibc, and
  508. return a live pointer when someone calls malloc(0). This pointer
  509. provides a malloc'ed area with a size of 1 byte. This feature is
  510. mostly useful when dealing with applications using autoconf's broken
  511. AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
  512. does not detect glibc style returning-a-valid-pointer-for-malloc(0)
  513. behavior). Most people can safely answer N.
  514. config UCLIBC_HAS_OBSTACK
  515. bool "Obstack Support (gnu extension)"
  516. help
  517. When this option is enabled, uClibc will provide support for obstacks.
  518. An obstack is a structure in which memory can be dynamically allocated
  519. as a 'stack of objects'. Many programs need this GNU extention and
  520. you should say Y if you are using any. Otherwise, say N to save some
  521. space.
  522. config UCLIBC_DYNAMIC_ATEXIT
  523. bool "Dynamic atexit() Support"
  524. default y
  525. help
  526. When this option is enabled, uClibc will support an infinite number,
  527. of atexit() and on_exit() functions, limited only by your available
  528. memory. This can be important when uClibc is used with C++, since
  529. global destructors are implemented via atexit(), and it is quite
  530. possible to exceed the default number when this option is disabled.
  531. Enabling this option adds a few bytes, and more significantly makes
  532. atexit and on_exit depend on malloc, which can be bad when compiling
  533. static executables.
  534. Unless you use uClibc with C++, you should probably answer N.
  535. config COMPAT_ATEXIT
  536. bool "Old (visible) atexit Support"
  537. help
  538. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  539. else you will be missing atexit() until you rebuild all apps.
  540. config UCLIBC_HAS_UTMPX
  541. bool "utmpx based support for tracking login/logouts to/from the system"
  542. help
  543. Answer y to enable support for accessing user accounting database.
  544. It can be used to track all login/logout to the system.
  545. config UCLIBC_HAS_UTMP
  546. bool "utmp support (XPG2 compat, SVr4 compat)"
  547. depends on UCLIBC_HAS_UTMPX
  548. help
  549. Answer y to enable legacy SVID support for accessing
  550. user accounting database:
  551. getutent(), getutid(), getutline(), pututline(),
  552. setutent(), endutent(), utmpname() in utmp.h
  553. It can be used to track all login/logout to the system.
  554. If unsure, answer N and use corresponding POSIX functions
  555. from utmpx.h
  556. config UCLIBC_SUSV2_LEGACY
  557. bool "Enable SuSv2 LEGACY functions"
  558. help
  559. Enable this option if you want to have SuSv2 LEGACY functions
  560. Currently applies to:
  561. valloc
  562. WARNING! ABI incompatibility.
  563. config UCLIBC_SUSV3_LEGACY
  564. bool "Enable SuSv3 LEGACY functions"
  565. #vfork,
  566. # h_errno
  567. # gethostbyaddr
  568. # gethostbyname
  569. help
  570. Enable this option if you want to have SuSv3 LEGACY functions
  571. in the library, else they are replaced by SuSv3 proposed macros.
  572. Currently applies to:
  573. bcmp, bcopy, bzero, index, rindex, ftime,
  574. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  575. (getwd), (makecontext),
  576. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  577. scalb, (setcontext), (swapcontext), ualarm, usleep,
  578. wcswcs.
  579. WARNING! ABI incompatibility.
  580. config UCLIBC_HAS_CONTEXT_FUNCS
  581. bool "Use obsolescent context control functions"
  582. depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
  583. help
  584. Add into library the SuSv3 obsolescent functions used for context
  585. control. The setcontext family allows the implementation in C of
  586. advanced control flow patterns such as iterators, fibers, and
  587. coroutines. They may be viewed as an advanced version of
  588. setjmp/longjmp; whereas the latter allows only a single non-local jump
  589. up the stack, setcontext allows the creation of multiple cooperative
  590. threads of control, each with its own stack.
  591. These functions are: setcontext, getcontext, makecontext, swapcontext.
  592. config UCLIBC_SUSV3_LEGACY_MACROS
  593. bool "Enable SuSv3 LEGACY macros"
  594. help
  595. Enable this option if you want to have SuSv3 LEGACY macros.
  596. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  597. WARNING! ABI incompatibility.
  598. config UCLIBC_SUSV4_LEGACY
  599. bool "Enable SuSv4 LEGACY or obsolescent functions"
  600. help
  601. Enable this option if you want to have SuSv4 LEGACY functions
  602. and macros in the library.
  603. Currently applies to:
  604. - XSI functions:
  605. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  606. gettimeofday, isascii, pthread_getconcurrency,
  607. pthread_setconcurrency, setitimer, setpgrp, sighold,
  608. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  609. tempnam, toascii, ulimit.
  610. - Base functions:
  611. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  612. tmpnam, utime.
  613. WARNING! ABI incompatibility.
  614. config UCLIBC_STRICT_HEADERS
  615. bool "Hide structures and constants for unsupported features"
  616. help
  617. Hide structures and constants in headers that should not be used,
  618. because the respective feature is disabled.
  619. WARNING! enabling this option requires to patch many faulty apps,
  620. since they make (wrongly) use of these structures/constants,
  621. although the feature was disabled.
  622. config UCLIBC_HAS_STUBS
  623. bool "Provide stubs for unavailable functionality"
  624. help
  625. With this option uClibc provides non-functional stubs for
  626. functions which are impossible to implement on the target
  627. architecture. Otherwise, such functions are simply omitted.
  628. config UCLIBC_HAS_SHADOW
  629. bool "Shadow Password Support"
  630. default y
  631. help
  632. Answer N if you do not need shadow password support.
  633. Most people will answer Y.
  634. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  635. bool "Support for program_invocation_name"
  636. help
  637. Support for the GNU-specific program_invocation_name and
  638. program_invocation_short_name strings. Some GNU packages
  639. (like tar and coreutils) utilize these for extra useful
  640. output, but in general are not required.
  641. At startup, these external strings are automatically set
  642. up based on the value of ARGV[0].
  643. If unsure, just answer N.
  644. config UCLIBC_HAS___PROGNAME
  645. bool "Support for __progname"
  646. default y
  647. help
  648. Some packages (like openssh) like to peek into internal libc
  649. symbols to make their output a bit more user friendly.
  650. At startup, __progname is automatically set up based on the
  651. value of ARGV[0].
  652. If unsure, just answer N.
  653. config UCLIBC_HAS_PTY
  654. bool "Support for pseudo-terminals"
  655. default y
  656. help
  657. This enables support for pseudo-terminals (see man 4 pts
  658. and man 7 pty).
  659. If unsure, just answer Y.
  660. config ASSUME_DEVPTS
  661. bool "Assume that /dev/pts is a devpts or devfs file system"
  662. default y
  663. depends on UCLIBC_HAS_PTY
  664. help
  665. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  666. these filesystems automatically manage permissions on the /dev/pts
  667. devices. You may need to mount your devpts or devfs filesystem on
  668. /dev/pts for this to work.
  669. Most people should answer Y.
  670. config UNIX98PTY_ONLY
  671. bool "Support only Unix 98 PTYs"
  672. default y
  673. depends on UCLIBC_HAS_PTY
  674. help
  675. If you want to support only Unix 98 PTYs enable this. Some older
  676. applications may need this disabled and will thus use legacy BSD
  677. style PTY handling which is more complex and also bigger than
  678. Unix 98 PTY handling.
  679. For most current programs, you can generally answer Y.
  680. if UNIX98PTY_ONLY
  681. config UCLIBC_HAS_GETPT
  682. bool "Support getpt() (glibc-compat)"
  683. depends on UCLIBC_HAS_PTY
  684. help
  685. Some packages may need getpt().
  686. All of those are non-standard and can be considered
  687. GNU/libc compatibility.
  688. Either use posix_openpt() or just open /dev/ptmx yourself.
  689. If unsure, just say N.
  690. endif
  691. if !UNIX98PTY_ONLY
  692. # Have to use __libc_ptyname{1,2}[] and related bloat
  693. config UCLIBC_HAS_GETPT
  694. def_bool y
  695. endif
  696. config UCLIBC_HAS_LIBUTIL
  697. bool "Provide libutil library and functions"
  698. depends on UCLIBC_HAS_PTY
  699. help
  700. Provide a libutil library.
  701. This non-standard conforming library provides the following
  702. utility functions:
  703. forkpty(): combines openpty(), fork(2), and login_tty() to
  704. create a new process operating in a pseudo-terminal.
  705. login(): write utmp and wtmp entries
  706. login_tty(): prepares for a login on the tty fd by creating a
  707. new session, making fd the controlling terminal for
  708. the calling process, setting fd to be the standard
  709. input, output, and error streams of the current
  710. process, and closing fd.
  711. logout(): write utmp and wtmp entries
  712. logwtmp(): constructs a utmp structure and calls updwtmp() to
  713. append the structure to the utmp file.
  714. openpty(): finds an available pseudo-terminal and returns
  715. file descriptors for the master and slave
  716. This library adds about 3k-4k to your system.
  717. config UCLIBC_HAS_TM_EXTENSIONS
  718. bool "Support 'struct tm' timezone extension fields"
  719. default y
  720. help
  721. Enabling this option adds fields to 'struct tm' in time.h for
  722. tracking the number of seconds east of UTC, and an abbreviation for
  723. the current timezone. These fields are not specified by the SuSv3
  724. standard, but they are commonly used in both GNU and BSD application
  725. code.
  726. To strictly follow the SuSv3 standard, leave this disabled.
  727. Most people will probably want to answer Y.
  728. config UCLIBC_HAS_TZ_CACHING
  729. bool "Enable caching of the last valid timezone 'TZ' string"
  730. default y
  731. help
  732. Answer Y to enable caching of the last valid 'TZ' string describing
  733. the timezone setting. This allows a quick string compare to avoid
  734. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  735. Most people will answer Y.
  736. config UCLIBC_HAS_TZ_FILE
  737. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  738. default y
  739. help
  740. Answer Y to enable the setting of a default timezone for uClibc.
  741. Ordinarily, uClibc gets the timezone information exclusively from the
  742. 'TZ' environment variable. In particular, there is no support for
  743. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  744. With this option enabled, uClibc will use the value stored in the
  745. file '/etc/TZ' (default path) to obtain timezone information if the
  746. 'TZ' environment variable is missing or has an invalid value. The
  747. file consists of a single line (newline required) of text describing
  748. the timezone in the format specified for the TZ environment variable.
  749. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  750. See
  751. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  752. for details on valid settings of 'TZ'.
  753. Most people will answer Y.
  754. config UCLIBC_HAS_TZ_FILE_READ_MANY
  755. bool "Repeatedly read the '/etc/TZ' file"
  756. depends on UCLIBC_HAS_TZ_FILE
  757. default y
  758. help
  759. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  760. a valid value has been read. This incurs the overhead of an
  761. open/read/close for each tzset() call (explicit or implied). However,
  762. setting this will allow applications to update their timezone
  763. information if the contents of the file change.
  764. Most people will answer Y.
  765. config UCLIBC_TZ_FILE_PATH
  766. string "Path to the 'TZ' file for setting the global timezone"
  767. depends on UCLIBC_HAS_TZ_FILE
  768. default "/etc/TZ"
  769. help
  770. This is the path to the 'TZ' file.
  771. Most people will use the default of '/etc/TZ'.
  772. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  773. bool "Use /etc/localtime as a fallback"
  774. depends on UCLIBC_HAS_TZ_FILE
  775. default y
  776. help
  777. Answer Y to try to use /etc/localtime file.
  778. On glibc systems this file (if it is in TZif2 format)
  779. contains timezone string at the end.
  780. Most people will answer Y.
  781. endmenu
  782. menu "Advanced Library Settings"
  783. config UCLIBC_PWD_BUFFER_SIZE
  784. int "Buffer size for getpwnam() and friends"
  785. default 256
  786. range 12 1024
  787. help
  788. This sets the value of the buffer size for getpwnam() and friends.
  789. By default, this is 256. (For reference, glibc uses 1024).
  790. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  791. parameter.
  792. config UCLIBC_GRP_BUFFER_SIZE
  793. int "Buffer size for getgrnam() and friends"
  794. default 256
  795. range 12 1024
  796. help
  797. This sets the value of the buffer size for getgrnam() and friends.
  798. By default, this is 256. (For reference, glibc uses 1024).
  799. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  800. parameter.
  801. comment "Support various families of functions"
  802. config UCLIBC_LINUX_MODULE_26
  803. bool "Linux kernel module functions (2.6)"
  804. default y
  805. help
  806. delete_module, init_module
  807. are used in linux for loadable kernel modules.
  808. Say N if you do not use kernel modules.
  809. config UCLIBC_LINUX_SPECIFIC
  810. bool "Linux specific functions"
  811. default y
  812. help
  813. accept4(), bdflush(),
  814. capget(), capset(), eventfd(), fallocate(),
  815. fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
  816. madvise(), modify_ldt(), pipe2(), personality(),
  817. prctl()/arch_prctl(), pivot_root(), modify_ldt(),
  818. ppoll(), readahead(), reboot(), remap_file_pages(),
  819. sched_getaffinity(), sched_setaffinity(), sendfile(),
  820. setfsgid(), setfsuid(), setresgid(), setresuid(),
  821. splice(), vmsplice(), tee(), signalfd(), statfs(),
  822. swapoff(), swapon(), sync_file_range(), syncfs(),
  823. _sysctl(), sysinfo(), timerfd_*(), vhangup(), umount(),
  824. umount2()
  825. config UCLIBC_HAS_GNU_ERROR
  826. bool "Support GNU extensions for error-reporting"
  827. default y
  828. help
  829. Support for the GNU-specific error(), error_at_line(),
  830. void (* error_print_progname)(), error_message_count
  831. functions and variables. Some GNU packages
  832. utilize these for extra useful output, but in general
  833. are not required.
  834. If unsure, just answer N.
  835. config UCLIBC_BSD_SPECIFIC
  836. bool "BSD specific functions"
  837. default y
  838. help
  839. mincore(), getdomainname(), setdomainname()
  840. If unsure, say N.
  841. config UCLIBC_HAS_BSD_ERR
  842. bool "BSD err functions"
  843. default y
  844. help
  845. These functions are non-standard BSD extensions.
  846. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  847. If unsure, say N.
  848. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  849. bool "BSD obsolete signal functions"
  850. help
  851. These functions are provided as a compatibility interface for
  852. programs that make use of the historical System V signal API.
  853. This API is obsolete:
  854. new applications should use the POSIX signal API (sigaction(2),
  855. sigprocmask(2), etc.).
  856. Affected functions:
  857. sigset(), sighold(), sigrelse(), sigignore()
  858. If unsure, say N.
  859. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  860. bool "SYSV obsolete signal functions"
  861. help
  862. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  863. If unsure, say N.
  864. config UCLIBC_NTP_LEGACY
  865. bool "ntp_*() aliases"
  866. help
  867. Provide legacy aliases for ntp functions:
  868. ntp_adjtime(), ntp_gettime()
  869. It is safe to say N here.
  870. config UCLIBC_SV4_DEPRECATED
  871. bool "Enable SVr4 deprecated functions"
  872. help
  873. These functions are DEPRECATED in System V release 4.
  874. Say N unless you desparately need one of the functions below:
  875. ustat() [use statfs(2) in your code instead]
  876. config UCLIBC_HAS_REALTIME
  877. bool "Realtime-related family of SUSv functions"
  878. default y
  879. help
  880. These functions are part of the Timers option and need not
  881. be available on all implementations.
  882. Includes AIO, message-queue, scheduler, semaphore functions:
  883. aio.h
  884. mqueue.h
  885. sched.h
  886. semaphore.h
  887. aio_cancel()
  888. aio_error()
  889. aio_fsync()
  890. aio_read()
  891. lio_listio()
  892. aio_return()
  893. aio_suspend()
  894. aio_write()
  895. clock_getres(), clock_gettime(), clock_settime()
  896. fdatasync()
  897. mlockall(), munlockall()
  898. mlock(), munlock()
  899. mq_close()
  900. mq_getattr()
  901. mq_notify()
  902. mq_open()
  903. mq_receive()
  904. mq_send()
  905. mq_setattr()
  906. mq_unlink()
  907. nanosleep()
  908. sched_getparam()
  909. sched_get_priority_max(), sched_get_priority_min()
  910. sched_getscheduler()
  911. sched_rr_get_interval()
  912. sched_setparam()
  913. sched_setscheduler()
  914. sem_close()
  915. sem_destroy()
  916. sem_getvalue()
  917. sem_init()
  918. sem_open()
  919. sem_post()
  920. sem_trywait(), sem_wait()
  921. sem_unlink()
  922. sigqueue()
  923. sigtimedwait(), sigwaitinfo()
  924. timer_create()
  925. timer_delete()
  926. timer_getoverrun(), timer_gettime(), timer_settime()
  927. config UCLIBC_HAS_ADVANCED_REALTIME
  928. bool "Advanced realtime-related family of SUSv functions"
  929. default y
  930. depends on UCLIBC_HAS_REALTIME
  931. help
  932. These functions are part of the Timers option and need not
  933. be available on all implementations.
  934. clock_getcpuclockid()
  935. clock_nanosleep()
  936. mq_timedreceive()
  937. mq_timedsend()
  938. posix_fadvise()
  939. posix_fallocate()
  940. posix_madvise()
  941. posix_memalign()
  942. posix_mem_offset()
  943. posix_spawnattr_destroy(), posix_spawnattr_init()
  944. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  945. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  946. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  947. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  948. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  949. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  950. posix_spawn_file_actions_addclose()
  951. posix_spawn_file_actions_adddup2()
  952. posix_spawn_file_actions_addopen()
  953. posix_spawn_file_actions_destroy()
  954. posix_spawn_file_actions_init()
  955. posix_spawn()
  956. posix_spawnp()
  957. posix_typed_mem_get_info()
  958. pthread_mutex_timedlock()
  959. sem_timedwait()
  960. #config UCLIBC_HAS_TERMIOS
  961. # bool "termios functions"
  962. # default y
  963. # help
  964. # Get and set terminal attributes, line control, get and set baud
  965. # rate.
  966. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  967. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  968. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  969. #
  970. # If unsure, say Y.
  971. config UCLIBC_HAS_EPOLL
  972. bool "epoll"
  973. default y
  974. help
  975. epoll_create(), epoll_ctl(), epoll_wait() functions.
  976. config UCLIBC_HAS_XATTR
  977. bool "Extended Attributes"
  978. default y
  979. help
  980. Extended Attributes support.
  981. setxattr()
  982. lsetxattr()
  983. fsetxattr()
  984. getxattr()
  985. lgetxattr()
  986. fgetxattr()
  987. listxattr()
  988. llistxattr()
  989. flistxattr()
  990. removexattr()
  991. lremovexattr()
  992. fremovexattr()
  993. Say N unless you need support for extended attributes and the
  994. filesystems do actually support them.
  995. config UCLIBC_HAS_PROFILING
  996. bool "Profiling support"
  997. default y
  998. help
  999. gcc's -finstrument-functions needs these.
  1000. Most people can safely answer N.
  1001. config UCLIBC_HAS_CRYPT_IMPL
  1002. bool "libcrypt support"
  1003. default y
  1004. help
  1005. libcrypt contains crypt(), setkey() and encrypt()
  1006. config UCLIBC_HAS_SHA256_CRYPT_IMPL
  1007. bool "libcrypt SHA256 support"
  1008. depends on UCLIBC_HAS_CRYPT_IMPL
  1009. help
  1010. This adds support for SHA256 password hashing via the crypt() function.
  1011. Say N here if you do not need SHA256 crypt support.
  1012. config UCLIBC_HAS_SHA512_CRYPT_IMPL
  1013. bool "libcrypt SHA512 support"
  1014. depends on UCLIBC_HAS_CRYPT_IMPL
  1015. help
  1016. This adds support for SHA512 password hashing via the crypt() function.
  1017. Say N here if you do not need SHA512 crypt support.
  1018. config UCLIBC_HAS_CRYPT_STUB
  1019. bool "libcrypt stubs"
  1020. default y
  1021. depends on !UCLIBC_HAS_CRYPT_IMPL
  1022. help
  1023. Standards mandate that crypt(3) provides a stub if it is unavailable.
  1024. If you enable this option then stubs for
  1025. crypt(), setkey() and encrypt()
  1026. will be provided in a small libcrypt.
  1027. config UCLIBC_HAS_CRYPT
  1028. def_bool y
  1029. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  1030. endmenu
  1031. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  1032. bool "Networking Support"
  1033. default y
  1034. help
  1035. Say N here if you do not need network support.
  1036. if UCLIBC_HAS_NETWORK_SUPPORT
  1037. config UCLIBC_HAS_SOCKET
  1038. bool "Socket support"
  1039. default y
  1040. help
  1041. If you want to include support for sockets then answer Y.
  1042. config UCLIBC_HAS_IPV4
  1043. bool "IP version 4 support"
  1044. default y
  1045. select UCLIBC_HAS_SOCKET
  1046. help
  1047. If you want to include support for the Internet Protocol
  1048. (IP version 4) then answer Y.
  1049. Most people will say Y.
  1050. config UCLIBC_HAS_IPV6
  1051. bool "IP version 6 support"
  1052. select UCLIBC_HAS_SOCKET
  1053. help
  1054. If you want to include support for the next version of the Internet
  1055. Protocol (IP version 6) then answer Y.
  1056. Most people should answer N.
  1057. config UCLIBC_HAS_RPC
  1058. bool "Remote Procedure Call (RPC) support"
  1059. # RPC+socket-ipvX doesn't currently work.
  1060. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1061. help
  1062. If you want to include RPC support, enable this. RPC is rarely used
  1063. for anything except for the NFS filesystem. Unless you plan to use
  1064. NFS, you can probably leave this set to N and save some space.
  1065. If you need to use NFS then you should answer Y.
  1066. config UCLIBC_HAS_FULL_RPC
  1067. bool "Full RPC support"
  1068. depends on UCLIBC_HAS_RPC
  1069. default y if !HAVE_SHARED
  1070. help
  1071. Normally we enable just enough RPC support for things like rshd and
  1072. nfs mounts to work. If you find you need the rest of the RPC stuff,
  1073. then enable this option. Most people can safely answer N.
  1074. config UCLIBC_HAS_REENTRANT_RPC
  1075. bool "Reentrant RPC support"
  1076. depends on UCLIBC_HAS_RPC
  1077. default y if !HAVE_SHARED
  1078. help
  1079. Most packages utilize the normal (non-reentrant) RPC functions, but
  1080. some (like exportfs from nfs-utils) need these reentrant versions.
  1081. Most people can safely answer N.
  1082. config UCLIBC_USE_NETLINK
  1083. bool "Use netlink to query interfaces"
  1084. depends on UCLIBC_HAS_SOCKET
  1085. help
  1086. In newer versions of Linux (2.4.17+), support was added for querying
  1087. network device information via netlink rather than the old style
  1088. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1089. it is smaller than netlink), but if you find that not all of your
  1090. devices are being returned by the if_nameindex() function, you will
  1091. have to use the netlink implementation.
  1092. Most people can safely answer N.
  1093. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1094. bool "Support the AI_ADDRCONFIG flag"
  1095. depends on UCLIBC_USE_NETLINK
  1096. help
  1097. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1098. implementation using netlink to query interfaces to find both
  1099. ipv4 and ipv6 support. This is only needed if an application uses
  1100. the AI_ADDRCONFIG flag.
  1101. Most people can safely answer N.
  1102. config UCLIBC_HAS_BSD_RES_CLOSE
  1103. bool "Support res_close() (bsd-compat)"
  1104. help
  1105. Answer Y if you desperately want to support BSD compatibility in
  1106. the network code.
  1107. Most people will say N.
  1108. config UCLIBC_HAS_COMPAT_RES_STATE
  1109. bool "Use compatible but bloated _res"
  1110. default y
  1111. help
  1112. Answer Y if you build network utilities and they muck with resolver
  1113. internals a lot (_res global structure). uclibc does not use most
  1114. of _res.XXX fields, and with this option OFF they won't even exist.
  1115. Which will make e.g. dig build fail.
  1116. Answering N saves around 400 bytes in bss.
  1117. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1118. bool "Use extra compatible but extra bloated _res"
  1119. help
  1120. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1121. As far as I can say, this should never be needed.
  1122. config UCLIBC_HAS_RESOLVER_SUPPORT
  1123. bool "DNS resolver functions"
  1124. select UCLIBC_HAS_COMPAT_RES_STATE
  1125. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1126. help
  1127. Provide implementations for DNS resolver functions.
  1128. In particular, the following functions will be added to the
  1129. library:
  1130. ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
  1131. res_mkquery, res_init, res_ninit, res_close, res_nclose
  1132. res_query, res_search, res_querydomain,
  1133. dn_expand, dn_comp,
  1134. ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
  1135. ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
  1136. ns_get16, ns_get32, ns_put16, ns_put32
  1137. endif
  1138. menu "String and Stdio Support"
  1139. config UCLIBC_HAS_STRING_GENERIC_OPT
  1140. bool "Use faster (but larger) generic string functions"
  1141. default y
  1142. help
  1143. Answer Y to use the (tweaked) glibc generic string functions.
  1144. In general, they are faster (but 3-5K larger) than the base
  1145. uClibc string functions which are optimized solely for size.
  1146. Many people will answer Y.
  1147. config UCLIBC_HAS_STRING_ARCH_OPT
  1148. bool "Use arch-specific assembly string functions (where available)"
  1149. default y
  1150. help
  1151. Answer Y to use any archtecture-specific assembly language string
  1152. functions available for this target plaform.
  1153. Note that assembly implementations are not available for all string
  1154. functions, so some generic (written in C) string functions may
  1155. still be used.
  1156. These are small and fast, the only reason _not_ to say Y here is
  1157. for debugging purposes.
  1158. config UCLIBC_HAS_STDIO_FUTEXES
  1159. bool "Use futexes for multithreaded I/O locking"
  1160. depends on UCLIBC_HAS_THREADS_NATIVE
  1161. help
  1162. If you want to compile uClibc to use futexes for low-level
  1163. I/O locking, answer Y. Otherwise, answer N.
  1164. config UCLIBC_HAS_CTYPE_TABLES
  1165. bool "Use Table Versions Of 'ctype.h' Functions."
  1166. default y
  1167. help
  1168. Answer Y to use table versions of the 'ctype.h' functions.
  1169. While the non-table versions are often smaller when building
  1170. statically linked apps, they work only in stub locale mode.
  1171. Most people will answer Y.
  1172. config UCLIBC_HAS_CTYPE_SIGNED
  1173. bool "Support Signed Characters In 'ctype.h' Functions."
  1174. depends on UCLIBC_HAS_CTYPE_TABLES
  1175. default y
  1176. help
  1177. Answer Y to enable support for passing signed char values to
  1178. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1179. these functions are only defined for unsigned char values and
  1180. EOF. However, glibc allows negative signed char values as well
  1181. in order to support 'broken old programs'.
  1182. Most people will answer Y.
  1183. choice
  1184. prompt "ctype argument checking"
  1185. depends on UCLIBC_HAS_CTYPE_TABLES
  1186. default UCLIBC_HAS_CTYPE_UNSAFE
  1187. help
  1188. Please select the invalid arg behavior you want for the 'ctype'
  1189. functions.
  1190. The 'ctype' functions are now implemented using table lookups, with
  1191. the arg being the index. This can result in incorrect memory accesses
  1192. or even segfaults for args outside of the allowed range.
  1193. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1194. the macro implementations.
  1195. config UCLIBC_HAS_CTYPE_UNSAFE
  1196. bool "Do not check -- unsafe"
  1197. config UCLIBC_HAS_CTYPE_CHECKED
  1198. bool "Detect and handle appropriately"
  1199. config UCLIBC_HAS_CTYPE_ENFORCED
  1200. bool "Issue a diagnostic and abort()"
  1201. endchoice
  1202. config UCLIBC_HAS_WCHAR
  1203. bool "Wide Character Support"
  1204. help
  1205. Answer Y to enable wide character support. This will make uClibc
  1206. much larger. It is also currently required for locale support.
  1207. Most people will answer N.
  1208. config UCLIBC_HAS_LOCALE
  1209. bool "Locale Support"
  1210. select UCLIBC_HAS_WCHAR
  1211. select UCLIBC_HAS_CTYPE_TABLES
  1212. help
  1213. uClibc now has full ANSI/ISO C99 locale support (except for
  1214. wcsftime() and collating items in regex). Be aware that enabling
  1215. this option will make uClibc much larger.
  1216. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1217. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1218. uClibc by around 300k. You can reduce this size by building your own
  1219. custom set of locate data (see extra/locale/LOCALES for details).
  1220. uClibc's locale support is still under development. For example,
  1221. codesets using shift states are not currently supported. Support is
  1222. planned in the next iteration of locale support.
  1223. Answer Y to enable locale support. Most people will answer N.
  1224. choice
  1225. prompt "Locale data"
  1226. depends on UCLIBC_HAS_LOCALE
  1227. default UCLIBC_BUILD_MINIMAL_LOCALE
  1228. config UCLIBC_BUILD_MINIMAL_LOCALE
  1229. bool "Only selected locales"
  1230. depends on UCLIBC_HAS_LOCALE
  1231. help
  1232. If you do not need all locales that are available on your
  1233. host-box, then set this to 'Y'.
  1234. config UCLIBC_BUILD_ALL_LOCALE
  1235. bool "All locales"
  1236. depends on UCLIBC_HAS_LOCALE
  1237. help
  1238. This builds all the locales that are available on your
  1239. host-box.
  1240. endchoice
  1241. config UCLIBC_BUILD_MINIMAL_LOCALES
  1242. string "locales to use"
  1243. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1244. default "en_US"
  1245. help
  1246. Space separated list of locales to use.
  1247. E.g.:
  1248. en_US en_GB de_AT
  1249. default:
  1250. en_US
  1251. config UCLIBC_HAS_XLOCALE
  1252. bool "Extended Locale Support (experimental/incomplete)"
  1253. depends on UCLIBC_HAS_LOCALE
  1254. help
  1255. Answer Y to enable extended locale support similar to that provided
  1256. by glibc. This is primarily intended to support libstd++
  1257. functionality.
  1258. However, it also allows thread-specific locale selection via
  1259. uselocale().
  1260. Most people will answer N.
  1261. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1262. bool "Support hexadecimal float notation"
  1263. depends on UCLIBC_HAS_CTYPE_TABLES
  1264. depends on UCLIBC_HAS_FLOATS
  1265. help
  1266. Answer Y to enable support for hexadecimal float notation in the
  1267. (wchar and) char string to floating point conversion functions, as
  1268. well as support for the %a and %A conversion specifiers in the
  1269. *printf() and *scanf() functions.
  1270. Most people will answer N.
  1271. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1272. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1273. depends on UCLIBC_HAS_LOCALE
  1274. depends on UCLIBC_HAS_FLOATS
  1275. help
  1276. Answer Y to enable support for glibc's \"'\" flag for allowing
  1277. locale-specific digit grouping in base 10 integer conversions and
  1278. appropriate floating point conversions in the *printf() and *scanf()
  1279. functions.
  1280. Most people will answer N.
  1281. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1282. bool "Do not require digit grouping when the \"'\" flag is specified"
  1283. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1284. default y
  1285. help
  1286. Answer Y to make digit grouping optional when the \"'\" flag is
  1287. specified.
  1288. This is the standard glibc behavior. If the initial string of digits
  1289. exceeds the maximum group number, the input will be treated as a
  1290. normal non-grouped number.
  1291. Most people will answer N.
  1292. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1293. bool "Support glibc's register_printf_function() (glibc-compat)"
  1294. depends on !USE_OLD_VFPRINTF
  1295. help
  1296. Answer Y to support glibc's register_printf_function() to allow an
  1297. application to add its own printf conversion specifiers.
  1298. parse_printf_format() is also enabled.
  1299. NOTE: Limits the number or registered specifiers to 10.
  1300. NOTE: Requires new conversion specifiers to be ASCII
  1301. characters (0-0x7f). This is to avoid problems with processing
  1302. format strings in locales with different multibyte conversions.
  1303. Most people will answer N.
  1304. config USE_OLD_VFPRINTF
  1305. bool "Use the old vfprintf implementation"
  1306. depends on !UCLIBC_HAS_WCHAR
  1307. help
  1308. Set to true to use the old vfprintf instead of the new. This is
  1309. roughly C89 compliant with some extensions, and is much smaller.
  1310. However, it does not support wide chars, positional args, or glibc
  1311. custom printf specifiers.
  1312. Most people will answer N.
  1313. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1314. int "Maximum number of positional args. Either 0 or >= 9."
  1315. depends on !USE_OLD_VFPRINTF
  1316. default 9
  1317. help
  1318. Set the maximum number of positional args supported by the
  1319. printf/scanf functions. The Single Unix Specification Version 3
  1320. requires a minimum value of 9. Setting this to a value lower than
  1321. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1322. in limits.h to be #undef'd.
  1323. WARNING! The workspace to support positional args is currently
  1324. allocated on the stack. You probably don't want to set
  1325. this to too high a value.
  1326. Most people will answer 9.
  1327. choice
  1328. prompt "Stdio buffer size"
  1329. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1330. help
  1331. Please select a value for BUFSIZ. This will be used by the
  1332. stdio subsystem as the default buffer size for a file, and
  1333. affects fopen(), setvbuf(), etc.
  1334. NOTE: Setting this to 'none' will disable buffering completely.
  1335. However, BUFSIZ will still be defined in stdio.h as 256 because
  1336. many applications use this value.
  1337. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1338. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1339. depends on !UCLIBC_HAS_WCHAR
  1340. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1341. bool "256 (minimum ANSI/ISO C99 value)"
  1342. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1343. bool "512"
  1344. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1345. bool "1024"
  1346. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1347. bool "2048"
  1348. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1349. bool "4096"
  1350. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1351. bool "8192"
  1352. # If you add more choices, you will need to update uClibc_stdio.h.
  1353. endchoice
  1354. choice
  1355. prompt "Stdio builtin buffer size (uClibc-specific)"
  1356. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1357. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1358. help
  1359. When a FILE is created with fopen(), an attempt is made to allocate
  1360. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1361. succeed but the FILE will be unbuffered.
  1362. This option adds a small amount of space to each FILE to act as an
  1363. emergency buffer in the event of a buffer allocation failure.
  1364. Most people will answer None.
  1365. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1366. bool "None"
  1367. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1368. bool "4"
  1369. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1370. bool "8"
  1371. # If you add more choices, you will need to update uClibc_stdio.h.
  1372. endchoice
  1373. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1374. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1375. help
  1376. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1377. a behavioral change made in SUSv3. Previously, abort() was required
  1378. to have the affect of fclose() on all open streams. The wording has
  1379. been changed to "may" from "shall".
  1380. Most people will answer N.
  1381. config UCLIBC_HAS_STDIO_GETC_MACRO
  1382. bool "Provide a macro version of getc()"
  1383. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1384. default y
  1385. help
  1386. Provide a macro version of getc().
  1387. Most people will answer Y.
  1388. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1389. bool "Provide a macro version of putc()"
  1390. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1391. default y
  1392. help
  1393. Provide a macro version of putc().
  1394. Most people will answer Y.
  1395. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1396. bool "Support auto-r/w transition"
  1397. default y
  1398. help
  1399. Answer Y to enable the stdio subsystem to automaticly transition
  1400. between reading and writing. This relaxes the ANSI/ISO C99
  1401. requirement:
  1402. When a file is opened with update mode ('+' as the second or third
  1403. character in the list of mode argument values), both input and output
  1404. may be performed on the associated stream. However, output shall not
  1405. be directly followed by input without an intervening call to the
  1406. fflush function or to a file positioning function (fseek, fsetpos,
  1407. or rewind), and input shall not be directly followed by output without
  1408. an intervening call to a file positioning function, unless the input
  1409. operation encounters end­of­file.
  1410. Most people will answer Y.
  1411. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1412. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1413. help
  1414. Answer Y to enable a uClibc-specific extension to allow passing an
  1415. additional 'F' flag in the mode string for fopen() to specify that
  1416. the file should be open()ed with the O_LARGEFILE flag set.
  1417. Most people will answer N.
  1418. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1419. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1420. help
  1421. Answer Y to support a glibc extension to allow passing
  1422. additional 'x' flag in the mode string for fopen() to specify that
  1423. the file should be open()ed with the O_EXCL flag set.
  1424. Most people will answer N.
  1425. config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
  1426. bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
  1427. help
  1428. Answer Y to support a glibc extension to allow passing
  1429. additional 'e' flag in the mode string for fopen() to specify that
  1430. the file should be open()ed with the O_CLOEXEC flag set.
  1431. Most people will answer N.
  1432. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1433. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1434. help
  1435. Answer Y to support the glibc 'custom stream' extension functions
  1436. fmemopen(), open_memstream(), and fopencookie().
  1437. NOTE: There are some minor differences regarding seeking behavior.
  1438. Most people will answer N.
  1439. config UCLIBC_HAS_PRINTF_M_SPEC
  1440. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1441. help
  1442. Answer Y to support a glibc extension to interpret '%m' in printf
  1443. format strings as an instruction to output the error message string
  1444. (as generated by strerror) corresponding to the current value of
  1445. 'errno'.
  1446. Most people will answer N.
  1447. config UCLIBC_HAS_ERRNO_MESSAGES
  1448. bool "Include the errno message text in the library"
  1449. default y
  1450. help
  1451. Answer Y if you want to include the errno message text in the
  1452. library. This adds about 3K to the library, but enables strerror()
  1453. to generate text other than 'Unknown error <number>'.
  1454. Most people will answer Y.
  1455. config UCLIBC_HAS_SYS_ERRLIST
  1456. bool "Support sys_errlist[] (obsolete-compat)"
  1457. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1458. help
  1459. Answer Y if you want to support the obsolete sys_errlist[].
  1460. This adds about 0.5k to the library, except for the mips
  1461. arch where it adds over 4K.
  1462. WARNING! In the future, support for sys_errlist[] may be unavailable
  1463. in at least some configurations. In fact, it may be removed
  1464. altogether.
  1465. Most people will answer N.
  1466. Application writers: use the strerror(3) function.
  1467. config UCLIBC_HAS_SIGNUM_MESSAGES
  1468. bool "Include the signum message text in the library"
  1469. default y
  1470. help
  1471. Answer Y if you want to include the signum message text in the
  1472. library. This adds about 0.5K to the library, but enables strsignal()
  1473. to generate text other than 'Unknown signal <number>'.
  1474. Most people will answer Y.
  1475. config UCLIBC_HAS_SYS_SIGLIST
  1476. bool "Support sys_siglist[] (bsd-compat)"
  1477. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1478. help
  1479. Answer Y if you want to support sys_siglist[].
  1480. WARNING! In the future, support for sys_siglist[] may be unavailable
  1481. in at least some configurations. In fact, it may be removed
  1482. altogether.
  1483. Most people will answer N.
  1484. config UCLIBC_HAS_GNU_GETOPT
  1485. bool "Support gnu getopt"
  1486. default y
  1487. help
  1488. Answer Y if you want to include full gnu getopt() instead of a
  1489. (much smaller) SUSv3 compatible getopt().
  1490. Note that getopt_long, getopt_long_only as well as getsubopt
  1491. are implemented on top of this choice.
  1492. Most people will answer Y.
  1493. config UCLIBC_HAS_GETOPT_LONG
  1494. bool "Support getopt_long/getopt_long_only (glibc-compat)"
  1495. default y
  1496. help
  1497. Answer Y if you want to include getopt_long[_only()] used by many
  1498. apps.
  1499. Most people will answer Y.
  1500. config UCLIBC_HAS_GNU_GETSUBOPT
  1501. bool "Support getsubopt"
  1502. default y
  1503. help
  1504. Answer Y if you want to include getsubopt().
  1505. Most people will answer Y.
  1506. config UCLIBC_HAS_ARGP
  1507. bool "Support argp (as standalone shared object)"
  1508. select UCLIBC_HAS_GETOPT_LONG
  1509. select UCLIBC_HAS_GNU_GETOPT
  1510. default n
  1511. help
  1512. Argp is an interface for parsing unix-style argument vectors. Unlike
  1513. the common getopt interface, it provides many advanced features in
  1514. addition to parsing options, such as automatic output in response to
  1515. `--help' and `--version' options.
  1516. A library can export an argp option parser, which programs can easily
  1517. use in conjunction with their own option parser.
  1518. Argp support is needed by elfutils libdw.
  1519. Most people can safely answer N.
  1520. endmenu
  1521. menu "Big and Tall"
  1522. config UCLIBC_HAS_REGEX
  1523. bool "Regular Expression Support"
  1524. default y
  1525. help
  1526. POSIX regular expression code is really big -- 53k all by itself.
  1527. If you don't use regular expressions, turn this off and save space.
  1528. Of course, if you only statically link, leave this on, since it will
  1529. only be included in your apps if you use regular expressions.
  1530. config UCLIBC_HAS_REGEX_OLD
  1531. bool "Use the older (stable) regular expression code"
  1532. depends on UCLIBC_HAS_REGEX
  1533. default y
  1534. help
  1535. There are two versions of regex. The older (stable) version has
  1536. been in uClibc for quite a long time but hasn't seen too many
  1537. updates. It also has some known issues when dealing with uncommon
  1538. corner cases and multibyte/unicode strings. However, it is quite
  1539. a bit smaller than the newer version.
  1540. If the older version has worked for you and you don't need unicode
  1541. support, then stick with the old version (and say Y here).
  1542. Otherwise, you should use the new version (and say N here).
  1543. config UCLIBC_HAS_FNMATCH
  1544. bool "fnmatch Support"
  1545. default y
  1546. help
  1547. POSIX fnmatch.
  1548. config UCLIBC_HAS_FNMATCH_OLD
  1549. bool "Use the older (stable) fnmatch code"
  1550. depends on UCLIBC_HAS_FNMATCH
  1551. default y
  1552. help
  1553. There are two versions of fnmatch. The older (stable) version has
  1554. been in uClibc for quite a long time but hasn't seen too many
  1555. updates. It also has some known issues when dealing with uncommon
  1556. corner cases and multibyte/unicode strings. However, it is quite
  1557. a bit smaller than the newer version.
  1558. If the older version has worked for you and you don't need unicode
  1559. support, then stick with the old version (and say Y here).
  1560. Otherwise, you should use the new version (and say N here).
  1561. config UCLIBC_HAS_WORDEXP
  1562. bool "Support the wordexp() interface"
  1563. depends on UCLIBC_HAS_GLOB
  1564. help
  1565. The SuSv3 wordexp() interface performs word expansions per the Shell
  1566. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1567. intended for use by applications that want to implement all of the
  1568. standard Bourne shell expansions on input data.
  1569. This interface is rarely used, and very large. Unless you have a
  1570. pressing need for wordexp(), you should probably answer N.
  1571. config UCLIBC_HAS_NFTW
  1572. bool "Support the nftw() interface"
  1573. help
  1574. The SuSv3 nftw() interface is used to recursively descend
  1575. directory paths while repeatedly calling a function.
  1576. This interface is rarely used, and adds around 4.5k. Unless you have
  1577. a pressing need for nftw(), you should probably answer N.
  1578. config UCLIBC_HAS_FTW
  1579. bool "Support the ftw() interface (SUSv4-obsolete)"
  1580. depends on UCLIBC_SUSV4_LEGACY
  1581. help
  1582. The SuSv3 ftw() interface is used to recursively descend
  1583. directory paths while repeatedly calling a function.
  1584. This interface is rarely used, and adds around 4.5k. Unless you have
  1585. a pressing need for ftw(), you should probably answer N.
  1586. config UCLIBC_HAS_FTS
  1587. bool "Support the fts() interface (bsd-compat)"
  1588. help
  1589. The fts functions are provided for traversing UNIX file hierarchies.
  1590. This interface is currently used by the elfutils and adds
  1591. around 7.5k.
  1592. You should port your application to use the POSIX nftw()
  1593. interface.
  1594. Unless you need to build/use elfutils, you should prolly answer N.
  1595. config UCLIBC_HAS_GLOB
  1596. bool "Support the glob() interface"
  1597. depends on UCLIBC_HAS_FNMATCH
  1598. default y
  1599. help
  1600. The glob interface is somewhat large (weighing in at about 2,5k). It
  1601. is used fairly often, but is an option since people wanting to go for
  1602. absolute minimum size may wish to omit it.
  1603. Most people will answer Y.
  1604. config UCLIBC_HAS_GNU_GLOB
  1605. bool "Support gnu glob() interface"
  1606. depends on UCLIBC_HAS_GLOB
  1607. help
  1608. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1609. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1610. from glibc and does not support all the GNU specific options.
  1611. Answer Y if you want to include full gnu glob() instead of the smaller
  1612. SUSv3 compatible glob().
  1613. Most people will answer N.
  1614. endmenu
  1615. menu "Library Installation Options"
  1616. config RUNTIME_PREFIX
  1617. string "uClibc runtime library directory"
  1618. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1619. help
  1620. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1621. libraries will be installed. The result will look something
  1622. like the following:
  1623. $(RUNTIME_PREFIX)/
  1624. lib/ <contains all runtime libraries>
  1625. usr/bin/ldd <the ldd utility program>
  1626. sbin/ldconfig <the ldconfig utility program>
  1627. This value is used by the 'make install' Makefile target. Since this
  1628. directory is compiled into the shared library loader, you will need to
  1629. recompile uClibc if you change this value...
  1630. For a typical target system this should be set to "/", such that
  1631. 'make install' will install /lib/libuClibc-<VERSION>.so
  1632. config DEVEL_PREFIX
  1633. string "uClibc development environment directory"
  1634. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1635. help
  1636. DEVEL_PREFIX is the directory into which the uClibc development
  1637. environment will be installed. The result will look something
  1638. like the following:
  1639. $(DEVEL_PREFIX)/
  1640. lib/ <contains static libs>
  1641. include/ <Where all the header files go>
  1642. This value is used by the 'make install' Makefile target when
  1643. installing a uClibc development environment.
  1644. For a typical target system this should be set to "/usr", such that
  1645. 'make install' will install /usr/include/<header files>.
  1646. config MULTILIB_DIR
  1647. string "library path component"
  1648. default "lib"
  1649. help
  1650. Path component where libraries reside.
  1651. For a typical target system this should be set to "lib", such that
  1652. 'make install' will install libraries to "/lib" and "/usr/lib"
  1653. respectively
  1654. DEVEL_PREFIX/MULTILIB_DIR
  1655. RUNTIME_PREFIX/MULTILIB_DIR
  1656. Other settings may include "lib32" or "lib64".
  1657. config HARDWIRED_ABSPATH
  1658. bool "Hardwire absolute paths into linker scripts"
  1659. default y
  1660. help
  1661. This prepends absolute paths to the libraries mentioned in linker
  1662. scripts such as libc.so.
  1663. This is a build time optimization. It has no impact on dynamic
  1664. linking at runtime, which doesn't use linker scripts.
  1665. You must disable this to use uClibc with old non-sysroot toolchains,
  1666. such as the prebuilt binary cross compilers at:
  1667. http://uclibc.org/downloads/binaries
  1668. The amount of time saved by this optimization is actually too small to
  1669. measure. The linker just had to search the library path to find the
  1670. linker script, so the dentries are cache hot if it has to search the
  1671. same path again. But it's what glibc does, so we do it too.
  1672. endmenu
  1673. menu "Security options"
  1674. config UCLIBC_BUILD_PIE
  1675. bool "Build utilities as ET_DYN/PIE executables"
  1676. depends on HAVE_SHARED
  1677. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_nds32
  1678. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1679. help
  1680. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1681. executables.
  1682. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1683. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1684. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1685. all libraries have to be built with -fPIC or -fpic, and all
  1686. assembler functions must be written as position independent
  1687. code (PIC).
  1688. config UCLIBC_HAS_ARC4RANDOM
  1689. bool "Include the arc4random() function"
  1690. help
  1691. Answer Y to support the OpenBSD-like arc4random() function. This
  1692. function picks a random number between 0 and N, and will always return
  1693. something even if the random driver is dead. If urandom fails then
  1694. gettimeofday(2) will be used as the random seed. This function is
  1695. designed to be more dependable than invoking /dev/urandom directly.
  1696. OpenSSL and OpenNTPD currently support this function.
  1697. Most people will answer N.
  1698. config ARC4RANDOM_USES_NODEV
  1699. bool "Do not use /dev/urandom with arc4random()"
  1700. depends on UCLIBC_HAS_ARC4RANDOM
  1701. help
  1702. Answer Y to use gettimeofday(2) and getpid(2) exclusively for
  1703. arc4random(). This is not a bad idea for a diskless system, but
  1704. it uses a lot of syscalls to stir each array element.
  1705. Most people will answer N.
  1706. config HAVE_NO_SSP
  1707. bool
  1708. config UCLIBC_HAS_SSP
  1709. bool "Support for GCC stack smashing protector"
  1710. depends on !HAVE_NO_SSP
  1711. help
  1712. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1713. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1714. the needed functions are added to ldso/libc instead.
  1715. GCC's stack protector is a reimplementation of IBM's propolice.
  1716. See http://www.trl.ibm.com/projects/security/ssp/ and
  1717. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1718. for details.
  1719. Note that NOEXECSTACK on a kernel with address space randomization
  1720. is generally sufficient to prevent most buffer overflow exploits
  1721. without increasing code size. This option essentially adds debugging
  1722. code to catch them.
  1723. Most people will answer N.
  1724. config SSP_QUICK_CANARY
  1725. bool "Use simple guard values without accessing /dev/urandom"
  1726. depends on UCLIBC_HAS_SSP
  1727. help
  1728. Use gettimeofday(2) to define the __guard without accessing
  1729. /dev/urandom.
  1730. WARNING: This makes smashing stack protector vulnerable to timing
  1731. attacks.
  1732. Most people will answer N.
  1733. choice
  1734. prompt "Propolice protection blocking signal"
  1735. depends on UCLIBC_HAS_SSP
  1736. depends on DODEBUG
  1737. default PROPOLICE_BLOCK_SEGV
  1738. help
  1739. "abort" use SIGABRT to block offending programs.
  1740. This is the default implementation.
  1741. "segfault" use SIGSEGV to block offending programs.
  1742. Use this for debugging.
  1743. If unsure, answer "abort".
  1744. config PROPOLICE_BLOCK_ABRT
  1745. bool "abort"
  1746. config PROPOLICE_BLOCK_SEGV
  1747. bool "segfault"
  1748. endchoice
  1749. config UCLIBC_BUILD_SSP
  1750. bool "Build uClibc with -fstack-protector"
  1751. depends on UCLIBC_HAS_SSP
  1752. help
  1753. Build all uClibc libraries and executables with -fstack-protector,
  1754. adding extra stack overflow checking to most uClibc functions.
  1755. config UCLIBC_BUILD_RELRO
  1756. bool "Build uClibc with linker option -z RELRO"
  1757. depends on HAVE_SHARED
  1758. default y
  1759. help
  1760. Build all libraries and executables with "ld -z relro".
  1761. This tells the linker to mark chunks of an executable or shared
  1762. library read-only after applying dynamic relocations. (This comes
  1763. up when a global const variable is initialized to the address of a
  1764. function or the value of another global variable.)
  1765. This is a fairly obscure option the ld man page doesn't even bother
  1766. to document properly. It's a security paranoia issue that's more
  1767. likely to consume memory (by allocating an extra page) rather than
  1768. save it.
  1769. This is explained in more depth at
  1770. http://www.airs.com/blog/archives/189
  1771. Nobody is likely to care whether you say Y or N here.
  1772. config UCLIBC_BUILD_NOW
  1773. bool "Build uClibc with linker option -z NOW"
  1774. depends on HAVE_SHARED
  1775. help
  1776. Build all libraries and executables with "ld -z now".
  1777. This tells the linker to resolve all symbols when the library is
  1778. first loaded, rather than when each function is first called. This
  1779. increases start-up latency by a few microseconds and may do
  1780. unnecessary work (resolving symbols that are never used), but the
  1781. realtime people like it for making microbenchmark timings slightly
  1782. more predictable and in some cases it can be slightly faster due to
  1783. CPU cache behavior (not having to fault the linker back in to do
  1784. lazy symbol resolution).
  1785. Most people can't tell the difference between selecting Y or N here.
  1786. config UCLIBC_BUILD_NOEXECSTACK
  1787. bool "Build uClibc with noexecstack marking"
  1788. default y
  1789. help
  1790. Mark all assembler files as noexecstack, which will mark uClibc
  1791. as not requiring an executable stack. (This doesn't prevent other
  1792. files you link against from claiming to need an executable stack, it
  1793. just won't cause uClibc to request it unnecessarily.)
  1794. This is a security thing to make buffer overflows harder to exploit.
  1795. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1796. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1797. It only actually provides any security when combined with address
  1798. space randomization, explained here: http://lwn.net/Articles/121845/
  1799. Address space randomization is on by default in current linux
  1800. kernels (although it can be disabled using the option
  1801. CONFIG_COMPAT_BRK).
  1802. You should probably say Y.
  1803. endmenu
  1804. menu "Development/debugging options"
  1805. config CROSS_COMPILER_PREFIX
  1806. string "Cross-compiling toolchain prefix"
  1807. default ""
  1808. help
  1809. The prefix used to execute your cross-compiling toolchain. For
  1810. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1811. then enter 'arm-linux-uclibc-' here.
  1812. config UCLIBC_EXTRA_CFLAGS
  1813. string "Extra CFLAGS"
  1814. default ""
  1815. help
  1816. Add any additional CFLAGS to be used to build uClibc.
  1817. config DODEBUG
  1818. bool "Enable debugging symbols"
  1819. select EXTRA_WARNINGS
  1820. help
  1821. Say Y here if you wish to compile uClibc with debugging symbols.
  1822. This will allow you to use a debugger to examine uClibc internals
  1823. while applications are running. This increases the size of the
  1824. library considerably and should only be used when doing development.
  1825. If you are doing development and want to debug uClibc, answer Y.
  1826. Otherwise, answer N.
  1827. config DODEBUG_PT
  1828. bool "Build pthread with debugging output"
  1829. depends on UCLIBC_HAS_THREADS && UCLIBC_HAS_LINUXTHREADS
  1830. help
  1831. Enable debug output in libpthread. This is only useful when doing
  1832. development in libpthread itself.
  1833. Otherwise, answer N.
  1834. config DOSTRIP
  1835. bool "Strip libraries and executables"
  1836. default y
  1837. depends on !DODEBUG
  1838. help
  1839. Say Y here if you do wish to strip all uClibc libraries and
  1840. executables. No stripping increases the size of the binaries
  1841. considerably, but makes it possible to debug uClibc libraries.
  1842. Most people will answer Y.
  1843. config DOASSERTS
  1844. bool "Build with run-time assertion testing"
  1845. help
  1846. Say Y here to include runtime assertion tests.
  1847. This enables runtime assertion testing in some code, which can
  1848. increase the size of the library and incur runtime overhead.
  1849. If you say N, then this testing will be disabled.
  1850. config SUPPORT_LD_DEBUG
  1851. bool "Build the shared library loader with debugging support"
  1852. depends on HAVE_SHARED
  1853. help
  1854. Answer Y here to enable all the extra code needed to debug the uClibc
  1855. native shared library loader. The level of debugging noise that is
  1856. generated depends on the LD_DEBUG environment variable... Just set
  1857. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1858. debug your application. Diagnostic messages will then be printed to
  1859. the stderr.
  1860. For now these debugging tokens are available:
  1861. detail provide more information for some options
  1862. move display copy processing
  1863. symbols display symbol table processing
  1864. reloc display relocation processing; detail shows the
  1865. relocation patch
  1866. nofixups never fixes up jump relocations
  1867. bindings displays the resolve processing (function calls);
  1868. detail shows the relocation patch
  1869. all Enable everything!
  1870. The additional environment variable:
  1871. LD_DEBUG_OUTPUT=file
  1872. redirects the diagnostics to an output file created using
  1873. the specified name and the process id as a suffix.
  1874. An excellent start is simply:
  1875. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1876. or to log everything to a file named 'logfile', try this
  1877. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1878. If you are doing development and want to debug uClibc's shared library
  1879. loader, answer Y. Mere mortals answer N.
  1880. config SUPPORT_LD_DEBUG_EARLY
  1881. bool "Build the shared library loader with early debugging support"
  1882. depends on HAVE_SHARED
  1883. help
  1884. Answer Y here to if you find the uClibc shared library loader is
  1885. crashing or otherwise not working very early on. This is typical
  1886. only when starting a new port when you haven't figured out how to
  1887. properly get the values for argc, argv, environ, etc. This method
  1888. allows a degree of visibility into the very early shared library
  1889. loader initialization process. If you are doing development and want
  1890. to debug the uClibc shared library loader early initialization,
  1891. answer Y. Mere mortals answer N.
  1892. config UCLIBC_MALLOC_DEBUGGING
  1893. bool "Build malloc with debugging support"
  1894. depends on MALLOC || MALLOC_STANDARD
  1895. select DOASSERTS
  1896. help
  1897. Answer Y here to compile extra debugging support code into malloc.
  1898. Malloc debugging output may then be enabled at runtime using the
  1899. MALLOC_DEBUG environment variable.
  1900. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1901. as a bitmask with the following bits:
  1902. 1 - do extra consistency checking
  1903. 2 - output messages for malloc/free calls and OS
  1904. allocation calls
  1905. 4 - output messages for the `MMB' layer
  1906. 8 - output messages for internal malloc heap manipulation
  1907. calls
  1908. Because this increases the size of malloc appreciably (due to strings
  1909. etc), you should say N unless you need to debug a malloc problem.
  1910. config UCLIBC_HAS_BACKTRACE
  1911. bool "Add support for application self-debugging"
  1912. depends on HAVE_SHARED
  1913. help
  1914. Answer Y here to compile support for application self-debugging that
  1915. provides the following new functions:
  1916. backtrace, backtrace_symbols, backtrace_symbols_fd
  1917. The backtrace functionality is currently supported on some platforms, and it
  1918. based on dwarf2 informations to properly work, so any application that
  1919. want to use backtrace needs to be built with -fexceptions flag.
  1920. The symbol names may be unavailable without the use of special linker
  1921. options. For systems using the GNU linker, it is necessary to use the
  1922. -rdynamic linker option too. Note that names of "static" functions are not
  1923. exposed, and won't be available in the backtrace.
  1924. config WARNINGS
  1925. string "Compiler Warnings"
  1926. default "-Wall"
  1927. help
  1928. Set this to the set of compiler warnings you wish to see while compiling.
  1929. config EXTRA_WARNINGS
  1930. bool "Enable extra annoying warnings"
  1931. help
  1932. If you wish to build with extra warnings enabled, say Y here.
  1933. endmenu