Config.in 70 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_aarch64 if DESIRED_TARGET_ARCH = "aarch64"
  15. default TARGET_alpha if DESIRED_TARGET_ARCH = "alpha"
  16. default TARGET_arc if DESIRED_TARGET_ARCH = "arc"
  17. default TARGET_arm if DESIRED_TARGET_ARCH = "arm"
  18. default TARGET_avr32 if DESIRED_TARGET_ARCH = "avr32"
  19. default TARGET_bfin if DESIRED_TARGET_ARCH = "bfin"
  20. default TARGET_cris if DESIRED_TARGET_ARCH = "cris"
  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_ia64 if DESIRED_TARGET_ARCH = "ia64"
  26. default TARGET_lm32 if DESIRED_TARGET_ARCH = "lm32"
  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_nds32 if DESIRED_TARGET_ARCH = "nds32"
  32. default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
  33. default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
  34. default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
  35. default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
  36. default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
  37. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  38. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  39. help
  40. The architecture of your target.
  41. config TARGET_aarch64
  42. bool "aarch64"
  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_frv
  60. bool "frv"
  61. config TARGET_h8300
  62. bool "h8300"
  63. config TARGET_hppa
  64. bool "hppa"
  65. config TARGET_i386
  66. bool "i386"
  67. config TARGET_ia64
  68. bool "ia64"
  69. config TARGET_lm32
  70. bool "lm32"
  71. config TARGET_m68k
  72. bool "m68k"
  73. config TARGET_metag
  74. bool "metag"
  75. config TARGET_microblaze
  76. bool "microblaze"
  77. config TARGET_mips
  78. bool "mips"
  79. config TARGET_nds32
  80. bool "nds32"
  81. config TARGET_nios2
  82. bool "nios2"
  83. config TARGET_or1k
  84. bool "or1k"
  85. config TARGET_powerpc
  86. bool "powerpc"
  87. config TARGET_sh
  88. bool "superh"
  89. config TARGET_sparc
  90. bool "sparc"
  91. config TARGET_x86_64
  92. bool "x86_64"
  93. config TARGET_xtensa
  94. bool "xtensa"
  95. endchoice
  96. menu "Target Architecture Features and Options"
  97. if TARGET_aarch64
  98. source "extra/Configs/Config.aarch64"
  99. endif
  100. if TARGET_alpha
  101. source "extra/Configs/Config.alpha"
  102. endif
  103. if TARGET_arm
  104. source "extra/Configs/Config.arm"
  105. endif
  106. if TARGET_avr32
  107. source "extra/Configs/Config.avr32"
  108. endif
  109. if TARGET_bfin
  110. source "extra/Configs/Config.bfin"
  111. endif
  112. if TARGET_cris
  113. source "extra/Configs/Config.cris"
  114. endif
  115. if TARGET_frv
  116. source "extra/Configs/Config.frv"
  117. endif
  118. if TARGET_h8300
  119. source "extra/Configs/Config.h8300"
  120. endif
  121. if TARGET_hppa
  122. source "extra/Configs/Config.hppa"
  123. endif
  124. if TARGET_i386
  125. source "extra/Configs/Config.i386"
  126. endif
  127. if TARGET_ia64
  128. source "extra/Configs/Config.ia64"
  129. endif
  130. if TARGET_lm32
  131. source "extra/Configs/Config.lm32"
  132. endif
  133. if TARGET_m68k
  134. source "extra/Configs/Config.m68k"
  135. endif
  136. if TARGET_metag
  137. source "extra/Configs/Config.metag"
  138. endif
  139. if TARGET_nds32
  140. source "extra/Configs/Config.nds32"
  141. endif
  142. if TARGET_nios2
  143. source "extra/Configs/Config.nios2"
  144. endif
  145. if TARGET_microblaze
  146. source "extra/Configs/Config.microblaze"
  147. endif
  148. if TARGET_mips
  149. source "extra/Configs/Config.mips"
  150. endif
  151. if TARGET_or1k
  152. source "extra/Configs/Config.or1k"
  153. endif
  154. if TARGET_powerpc
  155. source "extra/Configs/Config.powerpc"
  156. endif
  157. if TARGET_sh
  158. source "extra/Configs/Config.sh"
  159. endif
  160. if TARGET_sparc
  161. source "extra/Configs/Config.sparc"
  162. endif
  163. if TARGET_x86_64
  164. source "extra/Configs/Config.x86_64"
  165. endif
  166. if TARGET_xtensa
  167. source "extra/Configs/Config.xtensa"
  168. endif
  169. if TARGET_c6x
  170. source "extra/Configs/Config.c6x"
  171. endif
  172. if TARGET_arc
  173. source "extra/Configs/Config.arc"
  174. endif
  175. config TARGET_SUBARCH
  176. string
  177. default "e500" if CONFIG_E500
  178. default "classic" if CONFIG_CLASSIC
  179. default "sh4" if CONFIG_SH4
  180. default "sh4" if CONFIG_SH4A
  181. default "" if CONFIG_386
  182. default "i486" if CONFIG_486
  183. default "i586" if CONFIG_586
  184. default "i686" if CONFIG_686
  185. default "arcv2" if CONFIG_ARC_CPU_HS
  186. default ""
  187. source "extra/Configs/Config.in.arch"
  188. endmenu
  189. menu "General Library Settings"
  190. config HAVE_NO_PIC
  191. bool
  192. config DOPIC
  193. bool "Generate only Position Independent Code (PIC)"
  194. default y
  195. depends on !HAVE_NO_PIC
  196. help
  197. If you wish to build all of uClibc as PIC objects, then answer Y here.
  198. If you are unsure, then you should answer N.
  199. config ARCH_HAS_NO_SHARED
  200. bool
  201. config ARCH_HAS_NO_LDSO
  202. bool
  203. select ARCH_HAS_NO_SHARED
  204. config ARCH_HAS_UCONTEXT
  205. bool
  206. config HAVE_SHARED
  207. bool "Enable shared libraries"
  208. depends on !ARCH_HAS_NO_SHARED
  209. default y
  210. help
  211. If you wish to build uClibc with support for shared libraries then
  212. answer Y here. If you only want to build uClibc as a static library,
  213. then answer N.
  214. config FORCE_SHAREABLE_TEXT_SEGMENTS
  215. bool "Only load shared libraries which can share their text segment"
  216. depends on HAVE_SHARED
  217. select DOPIC
  218. help
  219. If you answer Y here, the uClibc native shared library loader will
  220. only load shared libraries, which do not need to modify any
  221. non-writable segments. These libraries haven't set the DT_TEXTREL
  222. tag in the dynamic section (==> objdump).
  223. All your libraries must be compiled with -fPIC or -fpic, and all
  224. assembler function must be written as position independent code (PIC).
  225. Enabling this option will make uClibc's shared library loader a
  226. little bit smaller and guarantee that no memory will be wasted by
  227. badly coded shared libraries.
  228. config LDSO_LDD_SUPPORT
  229. bool "Native 'ldd' support"
  230. depends on HAVE_SHARED
  231. default y
  232. help
  233. Enable all the code needed to support traditional ldd,
  234. which executes the shared library loader to resolve all dependencies
  235. and then provide a list of shared libraries that are required for an
  236. application to function. Disabling this option will make uClibc's
  237. shared library loader a little bit smaller.
  238. Most people will answer Y.
  239. config LDSO_CACHE_SUPPORT
  240. bool "Enable library loader cache (ld.so.conf)"
  241. depends on HAVE_SHARED
  242. default y
  243. help
  244. Enable this to make use of /etc/ld.so.conf, the shared library loader
  245. cache configuration file to support for non-standard library paths.
  246. After updating this file, it is necessary to run 'ldconfig' to update
  247. the /etc/ld.so.cache shared library loader cache file.
  248. config LDSO_PRELOAD_ENV_SUPPORT
  249. bool "Enable library loader LD_PRELOAD environment"
  250. depends on HAVE_SHARED
  251. default y
  252. help
  253. Enable this to make use of LD_PRELOAD environment variable.
  254. A whitespace-separated list of additional, user-specified, ELF shared
  255. libraries to be loaded before all others. This can be used to
  256. selectively override functions in other shared libraries. For
  257. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  258. search directories that are also set-user-ID will be loaded.
  259. config LDSO_PRELOAD_FILE_SUPPORT
  260. bool "Enable library loader preload file (ld.so.preload)"
  261. depends on HAVE_SHARED
  262. help
  263. Enable this to make use of /etc/ld.so.preload. This file contains a
  264. whitespace separated list of shared libraries to be loaded before
  265. the program.
  266. config LDSO_BASE_FILENAME
  267. string "Shared library loader naming prefix"
  268. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  269. default "ld.so"
  270. help
  271. If you wish to support both uClibc and glibc on the same system, it
  272. is necessary to set this to something other than "ld.so" to avoid
  273. conflicts with glibc, which also uses "ld.so". This prevents both
  274. libraries from using the same /etc/ld.so.* files. If you wish to
  275. support both uClibc and glibc on the same system then you should set
  276. this to "ld-uClibc.so".
  277. Most people will leave this set to the default of "ld.so".
  278. WARNING: Changing the default prefix could cause problems with
  279. binutils' ld !
  280. config LDSO_STANDALONE_SUPPORT
  281. bool "Dynamic linker stand-alone mode support"
  282. depends on HAVE_SHARED
  283. help
  284. The dynamic linker can be run either indirectly through running some
  285. dynamically linked program or library (in which case no command line
  286. options to the dynamic linker can be passed and, in the ELF case, the
  287. dynamic linker which is stored in the .interp section of the program
  288. is executed) or directly by running:
  289. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  290. Stand-alone execution is a prerequisite for adding prelink
  291. capabilities to uClibc dynamic linker, as well useful for testing an
  292. updated version of the dynamic linker without breaking the system.
  293. config LDSO_PRELINK_SUPPORT
  294. bool "Dynamic linker prelink support"
  295. depends on HAVE_SHARED
  296. select LDSO_STANDALONE_SUPPORT
  297. help
  298. The dynamic linker can be used in stand-alone mode by the prelink tool
  299. for prelinking ELF shared libraries and binaries to speed up startup
  300. time. It also is able to load and handle prelinked libraries and
  301. binaries at runtime.
  302. config UCLIBC_STATIC_LDCONFIG
  303. bool "Link ldconfig statically"
  304. depends on HAVE_SHARED
  305. default y
  306. help
  307. Enable this option to statically link the ldconfig binary.
  308. Making ldconfig static can be beneficial if you have a library
  309. problem and need to use ldconfig to recover. Sometimes it is
  310. preferable to instead keep the size of the system down, in which
  311. case you should disable this option.
  312. config LDSO_RUNPATH
  313. bool "Enable ELF RUNPATH tag support"
  314. depends on HAVE_SHARED
  315. default y if LDSO_CACHE_SUPPORT
  316. help
  317. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  318. which extend the library search paths. They are really only useful
  319. if a package installs libraries in non standard locations and
  320. ld.so.conf support is disabled.
  321. Usage of RUNPATH tags is not too common, so disabling this feature
  322. should be safe for most people.
  323. config LDSO_RUNPATH_OF_EXECUTABLE
  324. bool "Use executables RUNPATH/RPATH when searching for libraries."
  325. depends on LDSO_RUNPATH
  326. default n
  327. help
  328. Use the executables RUNPATH/RPATH to find to find libraries even
  329. though this behavour is not standard. Setting this option causes
  330. the uclibc dynamic linker behavour to match the glibc dynamic linker.
  331. config LDSO_SAFE_RUNPATH
  332. bool "Allow only RUNPATH beginning with /"
  333. depends on LDSO_RUNPATH
  334. default y
  335. help
  336. Allow only absolute path in RPATH/RUNPATH.
  337. config LDSO_SEARCH_INTERP_PATH
  338. bool "Add ldso path to lib search path"
  339. depends on HAVE_SHARED
  340. default y
  341. help
  342. The ldso is told where it is being executed from and can use that
  343. path to find related core libraries. This is useful by default,
  344. but can be annoying in a mixed development environment.
  345. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  346. library search with /foo/boo/
  347. If unsure, simply say Y here.
  348. config LDSO_LD_LIBRARY_PATH
  349. bool "Add LD_LIBRARY_PATH to lib search path"
  350. depends on HAVE_SHARED
  351. default y
  352. help
  353. On hardened system it could be useful to disable the use of
  354. LD_LIBRARY_PATH environment variable (a colon-separated list of
  355. directories in which to search for ELF libraries at execution-time).
  356. If unsure, simply say Y here.
  357. config LDSO_NO_CLEANUP
  358. bool "Disable automatic unloading of dynamically loaded shared objects"
  359. depends on HAVE_SHARED
  360. help
  361. If you need complete allocation traces when debugging memory leaks
  362. using Valgrind in a process that dynamically loads shared objects,
  363. then answer Y here. Unlike glibc, uClibc unloads all dynamically
  364. loaded shared objects when a process exits, which prevents Valgrind
  365. from correctly resolving the symbols from the unloaded shared objects.
  366. Unless you know you need this, you should answer N.
  367. config UCLIBC_CTOR_DTOR
  368. bool
  369. default y
  370. help
  371. If you wish to build uClibc with support for global constructor
  372. (ctor) and global destructor (dtor) support, then answer Y here.
  373. When ctor/dtor support is enabled, binaries linked with uClibc must
  374. also be linked with crtbegin.o and crtend.o which are provided by gcc
  375. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  376. may need to be adjusted to include these files). This support will
  377. also add a small amount of additional size to each binary compiled vs
  378. uClibc. If you will be using uClibc with C++, or if you need the gcc
  379. __attribute__((constructor)) and __attribute__((destructor)) to work,
  380. then you definitely want to answer Y here. If you don't need ctors
  381. or dtors and want your binaries to be as small as possible, then
  382. answer N.
  383. config LDSO_GNU_HASH_SUPPORT
  384. bool "Enable GNU hash style support"
  385. depends on HAVE_SHARED
  386. help
  387. Newest binutils support a new hash style named GNU-hash. The dynamic
  388. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  389. if present into the ELF binaries, otherwise it will use the old SysV
  390. hash style (.hash). This ensures that it is completely backward
  391. compatible.
  392. Further, being the hash table implementation self-contained into each
  393. executable and shared libraries, objects with mixed hash style can
  394. peacefully coexist in the same process.
  395. If you want to use this new feature, answer Y
  396. choice
  397. prompt "Thread support"
  398. default HAS_NO_THREADS
  399. help
  400. If you want to compile uClibc with pthread support, then answer Y.
  401. This will increase the size of uClibc by adding a bunch of locking
  402. to critical data structures, and adding extra code to ensure that
  403. functions are properly reentrant.
  404. config HAS_NO_THREADS
  405. bool "none"
  406. help
  407. Disable thread support.
  408. config UCLIBC_HAS_LINUXTHREADS
  409. bool "Linuxthreads"
  410. # linuxthreads need nanosleep()
  411. select UCLIBC_HAS_REALTIME
  412. depends on !TARGET_aarch64 && \
  413. !TARGET_metag
  414. help
  415. If you want to compile uClibc with Linuxthreads support, then answer Y.
  416. config UCLIBC_HAS_THREADS_NATIVE
  417. bool "Native POSIX Threading (NPTL)"
  418. select UCLIBC_HAS_TLS
  419. select UCLIBC_HAS_STDIO_FUTEXES
  420. select UCLIBC_HAS_REALTIME
  421. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  422. depends on !CONFIG_386 && \
  423. !TARGET_alpha && \
  424. !TARGET_avr32 && \
  425. !TARGET_bfin && \
  426. !TARGET_c6x && \
  427. !TARGET_cris && \
  428. !TARGET_frv && \
  429. !TARGET_h8300 && \
  430. !TARGET_hppa && \
  431. !TARGET_ia64 && \
  432. !TARGET_m68k && \
  433. ARCH_USE_MMU
  434. help
  435. If you want to compile uClibc with NPTL support, then answer Y.
  436. endchoice
  437. config UCLIBC_HAS_THREADS
  438. def_bool y if !HAS_NO_THREADS
  439. config UCLIBC_HAS_TLS
  440. bool "Thread-Local Storage"
  441. depends on UCLIBC_HAS_THREADS_NATIVE
  442. help
  443. If you want to enable TLS support then answer Y.
  444. This is fast an efficient way to store per-thread local data
  445. which is not on stack. It needs __thread support enabled in
  446. gcc.
  447. config PTHREADS_DEBUG_SUPPORT
  448. bool "Build pthreads debugging support"
  449. depends on UCLIBC_HAS_THREADS
  450. help
  451. Say Y here if you wish to be able to debug applications that use
  452. uClibc's pthreads library. By enabling this option, a library
  453. named libthread_db will be built. This library will be dlopen()'d
  454. by gdb and will allow gdb to debug the threads in your application.
  455. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  456. you must compile gdb with uClibc in order for pthread debugging to
  457. work properly.
  458. If you are doing development and want to debug applications using
  459. uClibc's pthread library, answer Y. Otherwise, answer N.
  460. config UCLIBC_HAS_SYSLOG
  461. bool "Syslog support"
  462. default y
  463. depends on UCLIBC_HAS_NETWORK_SUPPORT
  464. select UCLIBC_HAS_SOCKET
  465. help
  466. Support sending messages to the system logger.
  467. This requires socket-support.
  468. config UCLIBC_HAS_LFS
  469. def_bool y
  470. help
  471. Large file support (always enabled; config symbol retained for
  472. feature test to be compatible with uClibc).
  473. choice
  474. prompt "Malloc Implementation"
  475. default MALLOC if ! ARCH_USE_MMU
  476. default MALLOC_STANDARD if ARCH_USE_MMU
  477. config MALLOC
  478. bool "malloc"
  479. help
  480. "malloc" use mmap for all allocations and so works very well on
  481. MMU-less systems that do not support the brk() system call. It is
  482. pretty smart about reusing already allocated memory, and minimizing
  483. memory wastage.
  484. This is the default for uClinux MMU-less systems.
  485. config MALLOC_SIMPLE
  486. bool "malloc-simple"
  487. help
  488. "malloc-simple" is trivially simple and slow as molasses. It
  489. was written from scratch for uClibc, and is the simplest possible
  490. (and therefore smallest) malloc implementation.
  491. This uses only the mmap() system call to allocate and free memory,
  492. and does not use the brk() system call at all, making it a fine
  493. choice for MMU-less systems with very limited memory. It's 100%
  494. standards compliant, thread safe, very small, and releases freed
  495. memory back to the OS immediately rather than keeping it in the
  496. process's heap for reallocation. It is also VERY SLOW.
  497. config MALLOC_STANDARD
  498. bool "malloc-standard"
  499. depends on ARCH_USE_MMU
  500. help
  501. "malloc-standard" is derived from the public domain dlmalloc
  502. implementation by Doug Lea. It is quite fast, and is pretty smart
  503. about reusing already allocated memory, and minimizing memory
  504. wastage. This uses brk() for small allocations, while using mmap()
  505. for larger allocations. This is the default malloc implementation
  506. for uClibc.
  507. If unsure, answer "malloc-standard".
  508. endchoice
  509. config UCLIBC_DYNAMIC_ATEXIT
  510. bool "Dynamic atexit() Support"
  511. default y
  512. help
  513. When this option is enabled, uClibc will support an infinite number,
  514. of atexit() and on_exit() functions, limited only by your available
  515. memory. This can be important when uClibc is used with C++, since
  516. global destructors are implemented via atexit(), and it is quite
  517. possible to exceed the default number when this option is disabled.
  518. Enabling this option adds a few bytes, and more significantly makes
  519. atexit and on_exit depend on malloc, which can be bad when compiling
  520. static executables.
  521. Unless you use uClibc with C++, you should probably answer N.
  522. config COMPAT_ATEXIT
  523. bool "Old (visible) atexit Support"
  524. help
  525. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  526. else you will be missing atexit() until you rebuild all apps.
  527. config UCLIBC_HAS_UTMPX
  528. bool "utmpx based support for tracking login/logouts to/from the system"
  529. help
  530. Answer y to enable support for accessing user accounting database.
  531. It can be used to track all login/logout to the system.
  532. config UCLIBC_HAS_UTMP
  533. bool "utmp support (XPG2 compat, SVr4 compat)"
  534. depends on UCLIBC_HAS_UTMPX
  535. help
  536. Answer y to enable legacy SVID support for accessing
  537. user accounting database:
  538. getutent(), getutid(), getutline(), pututline(),
  539. setutent(), endutent(), utmpname() in utmp.h
  540. It can be used to track all login/logout to the system.
  541. If unsure, answer N and use corresponding POSIX functions
  542. from utmpx.h
  543. config UCLIBC_SUSV2_LEGACY
  544. bool "Enable SuSv2 LEGACY functions"
  545. help
  546. Enable this option if you want to have SuSv2 LEGACY functions
  547. Currently applies to:
  548. valloc
  549. WARNING! ABI incompatibility.
  550. config UCLIBC_SUSV3_LEGACY
  551. bool "Enable SuSv3 LEGACY functions"
  552. #vfork,
  553. # h_errno
  554. # gethostbyaddr
  555. # gethostbyname
  556. help
  557. Enable this option if you want to have SuSv3 LEGACY functions
  558. in the library, else they are replaced by SuSv3 proposed macros.
  559. Currently applies to:
  560. bcmp, bcopy, bzero, index, rindex, ftime,
  561. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  562. (getwd), (makecontext),
  563. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  564. scalb, (setcontext), (swapcontext), ualarm, usleep,
  565. wcswcs.
  566. WARNING! ABI incompatibility.
  567. config UCLIBC_HAS_CONTEXT_FUNCS
  568. bool "Use obsolescent context control functions"
  569. depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
  570. help
  571. Add into library the SuSv3 obsolescent functions used for context
  572. control. The setcontext family allows the implementation in C of
  573. advanced control flow patterns such as iterators, fibers, and
  574. coroutines. They may be viewed as an advanced version of
  575. setjmp/longjmp; whereas the latter allows only a single non-local jump
  576. up the stack, setcontext allows the creation of multiple cooperative
  577. threads of control, each with its own stack.
  578. These functions are: setcontext, getcontext, makecontext, swapcontext.
  579. config UCLIBC_SUSV3_LEGACY_MACROS
  580. bool "Enable SuSv3 LEGACY macros"
  581. help
  582. Enable this option if you want to have SuSv3 LEGACY macros.
  583. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  584. WARNING! ABI incompatibility.
  585. config UCLIBC_SUSV4_LEGACY
  586. bool "Enable SuSv4 LEGACY or obsolescent functions"
  587. help
  588. Enable this option if you want to have SuSv4 LEGACY functions
  589. and macros in the library.
  590. Currently applies to:
  591. - XSI functions:
  592. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  593. gettimeofday, isascii, pthread_getconcurrency,
  594. pthread_setconcurrency, setitimer, setpgrp, sighold,
  595. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  596. tempnam, toascii, ulimit.
  597. - Base functions:
  598. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  599. tmpnam, utime.
  600. WARNING! ABI incompatibility.
  601. config UCLIBC_STRICT_HEADERS
  602. bool "Hide structures and constants for unsupported features"
  603. help
  604. Hide structures and constants in headers that should not be used,
  605. because the respective feature is disabled.
  606. WARNING! enabling this option requires to patch many faulty apps,
  607. since they make (wrongly) use of these structures/constants,
  608. although the feature was disabled.
  609. config UCLIBC_HAS_STUBS
  610. bool "Provide stubs for unavailable functionality"
  611. help
  612. With this option uClibc provides non-functional stubs for
  613. functions which are impossible to implement on the target
  614. architecture. Otherwise, such functions are simply omitted.
  615. config UCLIBC_HAS_SHADOW
  616. bool "Shadow Password Support"
  617. default y
  618. help
  619. Answer N if you do not need shadow password support.
  620. Most people will answer Y.
  621. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  622. bool "Support for program_invocation_name"
  623. help
  624. Support for the GNU-specific program_invocation_name and
  625. program_invocation_short_name strings. Some GNU packages
  626. (like tar and coreutils) utilize these for extra useful
  627. output, but in general are not required.
  628. At startup, these external strings are automatically set
  629. up based on the value of ARGV[0].
  630. If unsure, just answer N.
  631. config UCLIBC_HAS___PROGNAME
  632. bool "Support for __progname"
  633. default y
  634. help
  635. Some packages (like openssh) like to peek into internal libc
  636. symbols to make their output a bit more user friendly.
  637. At startup, __progname is automatically set up based on the
  638. value of ARGV[0].
  639. If unsure, just answer N.
  640. config UCLIBC_HAS_PTY
  641. bool "Support for pseudo-terminals"
  642. default y
  643. help
  644. This enables support for pseudo-terminals (see man 4 pts
  645. and man 7 pty).
  646. If unsure, just answer Y.
  647. config ASSUME_DEVPTS
  648. bool "Assume that /dev/pts is a devpts or devfs file system"
  649. default y
  650. depends on UCLIBC_HAS_PTY
  651. help
  652. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  653. these filesystems automatically manage permissions on the /dev/pts
  654. devices. You may need to mount your devpts or devfs filesystem on
  655. /dev/pts for this to work.
  656. Most people should answer Y.
  657. config UNIX98PTY_ONLY
  658. bool "Support only Unix 98 PTYs"
  659. default y
  660. depends on UCLIBC_HAS_PTY
  661. help
  662. If you want to support only Unix 98 PTYs enable this. Some older
  663. applications may need this disabled and will thus use legacy BSD
  664. style PTY handling which is more complex and also bigger than
  665. Unix 98 PTY handling.
  666. For most current programs, you can generally answer Y.
  667. if UNIX98PTY_ONLY
  668. config UCLIBC_HAS_GETPT
  669. bool "Support getpt() (glibc-compat)"
  670. depends on UCLIBC_HAS_PTY
  671. help
  672. Some packages may need getpt().
  673. All of those are non-standard and can be considered
  674. GNU/libc compatibility.
  675. Either use posix_openpt() or just open /dev/ptmx yourself.
  676. If unsure, just say N.
  677. endif
  678. if !UNIX98PTY_ONLY
  679. # Have to use __libc_ptyname{1,2}[] and related bloat
  680. config UCLIBC_HAS_GETPT
  681. def_bool y
  682. endif
  683. config UCLIBC_HAS_LIBUTIL
  684. bool "Provide libutil library and functions"
  685. depends on UCLIBC_HAS_PTY
  686. help
  687. Provide a libutil library.
  688. This non-standard conforming library provides the following
  689. utility functions:
  690. forkpty(): combines openpty(), fork(2), and login_tty() to
  691. create a new process operating in a pseudo-terminal.
  692. login(): write utmp and wtmp entries
  693. login_tty(): prepares for a login on the tty fd by creating a
  694. new session, making fd the controlling terminal for
  695. the calling process, setting fd to be the standard
  696. input, output, and error streams of the current
  697. process, and closing fd.
  698. logout(): write utmp and wtmp entries
  699. logwtmp(): constructs a utmp structure and calls updwtmp() to
  700. append the structure to the utmp file.
  701. openpty(): finds an available pseudo-terminal and returns
  702. file descriptors for the master and slave
  703. This library adds about 3k-4k to your system.
  704. config UCLIBC_HAS_TM_EXTENSIONS
  705. bool "Support 'struct tm' timezone extension fields"
  706. default y
  707. help
  708. Enabling this option adds fields to 'struct tm' in time.h for
  709. tracking the number of seconds east of UTC, and an abbreviation for
  710. the current timezone. These fields are not specified by the SuSv3
  711. standard, but they are commonly used in both GNU and BSD application
  712. code.
  713. To strictly follow the SuSv3 standard, leave this disabled.
  714. Most people will probably want to answer Y.
  715. config UCLIBC_HAS_TZ_CACHING
  716. bool "Enable caching of the last valid timezone 'TZ' string"
  717. default y
  718. help
  719. Answer Y to enable caching of the last valid 'TZ' string describing
  720. the timezone setting. This allows a quick string compare to avoid
  721. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  722. Most people will answer Y.
  723. config UCLIBC_HAS_TZ_FILE
  724. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  725. default y
  726. help
  727. Answer Y to enable the setting of a default timezone for uClibc.
  728. Ordinarily, uClibc gets the timezone information exclusively from the
  729. 'TZ' environment variable. In particular, there is no support for
  730. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  731. With this option enabled, uClibc will use the value stored in the
  732. file '/etc/TZ' (default path) to obtain timezone information if the
  733. 'TZ' environment variable is missing or has an invalid value. The
  734. file consists of a single line (newline required) of text describing
  735. the timezone in the format specified for the TZ environment variable.
  736. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  737. See
  738. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  739. for details on valid settings of 'TZ'.
  740. Most people will answer Y.
  741. config UCLIBC_HAS_TZ_FILE_READ_MANY
  742. bool "Repeatedly read the '/etc/TZ' file"
  743. depends on UCLIBC_HAS_TZ_FILE
  744. default y
  745. help
  746. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  747. a valid value has been read. This incurs the overhead of an
  748. open/read/close for each tzset() call (explicit or implied). However,
  749. setting this will allow applications to update their timezone
  750. information if the contents of the file change.
  751. Most people will answer Y.
  752. config UCLIBC_TZ_FILE_PATH
  753. string "Path to the 'TZ' file for setting the global timezone"
  754. depends on UCLIBC_HAS_TZ_FILE
  755. default "/etc/TZ"
  756. help
  757. This is the path to the 'TZ' file.
  758. Most people will use the default of '/etc/TZ'.
  759. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  760. bool "Use /etc/localtime as a fallback"
  761. depends on UCLIBC_HAS_TZ_FILE
  762. default y
  763. help
  764. Answer Y to try to use /etc/localtime file.
  765. On glibc systems this file (if it is in TZif2 format)
  766. contains timezone string at the end.
  767. Most people will answer Y.
  768. endmenu
  769. menu "Advanced Library Settings"
  770. config UCLIBC_PWD_BUFFER_SIZE
  771. int "Buffer size for getpwnam() and friends"
  772. default 256
  773. range 12 1024
  774. help
  775. This sets the value of the buffer size for getpwnam() and friends.
  776. By default, this is 256. (For reference, glibc uses 1024).
  777. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  778. parameter.
  779. config UCLIBC_GRP_BUFFER_SIZE
  780. int "Buffer size for getgrnam() and friends"
  781. default 256
  782. range 12 1024
  783. help
  784. This sets the value of the buffer size for getgrnam() and friends.
  785. By default, this is 256. (For reference, glibc uses 1024).
  786. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  787. parameter.
  788. comment "Support various families of functions"
  789. config UCLIBC_LINUX_SPECIFIC
  790. bool "Linux specific functions"
  791. default y
  792. help
  793. accept4(), bdflush(),
  794. capget(), capset(), eventfd(), fallocate(),
  795. fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
  796. madvise(), modify_ldt(), pipe2(), personality(),
  797. prctl()/arch_prctl(), pivot_root(), modify_ldt(),
  798. ppoll(), readahead(), reboot(), remap_file_pages(),
  799. sched_getaffinity(), sched_setaffinity(), sendfile(),
  800. setfsgid(), setfsuid(), setresgid(), setresuid(),
  801. splice(), vmsplice(), tee(), signalfd(), statfs(),
  802. swapoff(), swapon(), sync_file_range(), syncfs(),
  803. _sysctl(), sysinfo(), timerfd_*(), vhangup(), umount(),
  804. umount2()
  805. config UCLIBC_HAS_GNU_ERROR
  806. bool "Support GNU extensions for error-reporting"
  807. default y
  808. help
  809. Support for the GNU-specific error(), error_at_line(),
  810. void (* error_print_progname)(), error_message_count
  811. functions and variables. Some GNU packages
  812. utilize these for extra useful output, but in general
  813. are not required.
  814. If unsure, just answer N.
  815. config UCLIBC_BSD_SPECIFIC
  816. bool "BSD specific functions"
  817. default y
  818. help
  819. mincore(), getdomainname(), setdomainname()
  820. If unsure, say N.
  821. config UCLIBC_HAS_BSD_ERR
  822. bool "BSD err functions"
  823. default y
  824. help
  825. These functions are non-standard BSD extensions.
  826. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  827. If unsure, say N.
  828. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  829. bool "BSD obsolete signal functions"
  830. help
  831. These functions are provided as a compatibility interface for
  832. programs that make use of the historical System V signal API.
  833. This API is obsolete:
  834. new applications should use the POSIX signal API (sigaction(2),
  835. sigprocmask(2), etc.).
  836. Affected functions:
  837. sigset(), sighold(), sigrelse(), sigignore()
  838. If unsure, say N.
  839. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  840. bool "SYSV obsolete signal functions"
  841. help
  842. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  843. If unsure, say N.
  844. config UCLIBC_NTP_LEGACY
  845. bool "ntp_*() aliases"
  846. help
  847. Provide legacy aliases for ntp functions:
  848. ntp_adjtime(), ntp_gettime()
  849. It is safe to say N here.
  850. config UCLIBC_SV4_DEPRECATED
  851. bool "Enable SVr4 deprecated functions"
  852. help
  853. These functions are DEPRECATED in System V release 4.
  854. Say N unless you desparately need one of the functions below:
  855. ustat() [use statfs(2) in your code instead]
  856. config UCLIBC_HAS_REALTIME
  857. bool "Realtime-related family of SUSv functions"
  858. default y
  859. help
  860. These functions are part of the Timers option and need not
  861. be available on all implementations.
  862. Includes AIO, message-queue, scheduler, semaphore functions:
  863. aio.h
  864. mqueue.h
  865. sched.h
  866. semaphore.h
  867. aio_cancel()
  868. aio_error()
  869. aio_fsync()
  870. aio_read()
  871. lio_listio()
  872. aio_return()
  873. aio_suspend()
  874. aio_write()
  875. clock_getres(), clock_gettime(), clock_settime()
  876. fdatasync()
  877. mlockall(), munlockall()
  878. mlock(), munlock()
  879. mq_close()
  880. mq_getattr()
  881. mq_notify()
  882. mq_open()
  883. mq_receive()
  884. mq_send()
  885. mq_setattr()
  886. mq_unlink()
  887. nanosleep()
  888. sched_getparam()
  889. sched_get_priority_max(), sched_get_priority_min()
  890. sched_getscheduler()
  891. sched_rr_get_interval()
  892. sched_setparam()
  893. sched_setscheduler()
  894. sem_close()
  895. sem_destroy()
  896. sem_getvalue()
  897. sem_init()
  898. sem_open()
  899. sem_post()
  900. sem_trywait(), sem_wait()
  901. sem_unlink()
  902. sigqueue()
  903. sigtimedwait(), sigwaitinfo()
  904. timer_create()
  905. timer_delete()
  906. timer_getoverrun(), timer_gettime(), timer_settime()
  907. config UCLIBC_HAS_ADVANCED_REALTIME
  908. bool "Advanced realtime-related family of SUSv functions"
  909. default y
  910. depends on UCLIBC_HAS_REALTIME
  911. help
  912. These functions are part of the Timers option and need not
  913. be available on all implementations.
  914. clock_getcpuclockid()
  915. clock_nanosleep()
  916. mq_timedreceive()
  917. mq_timedsend()
  918. posix_fadvise()
  919. posix_fallocate()
  920. posix_madvise()
  921. posix_memalign()
  922. posix_mem_offset()
  923. posix_spawnattr_destroy(), posix_spawnattr_init()
  924. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  925. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  926. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  927. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  928. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  929. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  930. posix_spawn_file_actions_addclose()
  931. posix_spawn_file_actions_adddup2()
  932. posix_spawn_file_actions_addopen()
  933. posix_spawn_file_actions_destroy()
  934. posix_spawn_file_actions_init()
  935. posix_spawn()
  936. posix_spawnp()
  937. posix_typed_mem_get_info()
  938. pthread_mutex_timedlock()
  939. sem_timedwait()
  940. #config UCLIBC_HAS_TERMIOS
  941. # bool "termios functions"
  942. # default y
  943. # help
  944. # Get and set terminal attributes, line control, get and set baud
  945. # rate.
  946. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  947. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  948. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  949. #
  950. # If unsure, say Y.
  951. config UCLIBC_HAS_EPOLL
  952. bool "epoll"
  953. default y
  954. help
  955. epoll_create(), epoll_ctl(), epoll_wait() functions.
  956. config UCLIBC_HAS_XATTR
  957. bool "Extended Attributes"
  958. default y
  959. help
  960. Extended Attributes support.
  961. setxattr()
  962. lsetxattr()
  963. fsetxattr()
  964. getxattr()
  965. lgetxattr()
  966. fgetxattr()
  967. listxattr()
  968. llistxattr()
  969. flistxattr()
  970. removexattr()
  971. lremovexattr()
  972. fremovexattr()
  973. Say N unless you need support for extended attributes and the
  974. filesystems do actually support them.
  975. config UCLIBC_HAS_PROFILING
  976. bool "Profiling support"
  977. default y
  978. help
  979. gcc's -finstrument-functions needs these.
  980. Most people can safely answer N.
  981. config UCLIBC_HAS_CRYPT_IMPL
  982. bool "libcrypt support"
  983. default y
  984. help
  985. libcrypt contains crypt(), setkey() and encrypt()
  986. config UCLIBC_HAS_SHA256_CRYPT_IMPL
  987. bool "libcrypt SHA256 support"
  988. depends on UCLIBC_HAS_CRYPT_IMPL
  989. help
  990. This adds support for SHA256 password hashing via the crypt() function.
  991. Say N here if you do not need SHA256 crypt support.
  992. config UCLIBC_HAS_SHA512_CRYPT_IMPL
  993. bool "libcrypt SHA512 support"
  994. depends on UCLIBC_HAS_CRYPT_IMPL
  995. help
  996. This adds support for SHA512 password hashing via the crypt() function.
  997. Say N here if you do not need SHA512 crypt support.
  998. config UCLIBC_HAS_CRYPT_STUB
  999. bool "libcrypt stubs"
  1000. default y
  1001. depends on !UCLIBC_HAS_CRYPT_IMPL
  1002. help
  1003. Standards mandate that crypt(3) provides a stub if it is unavailable.
  1004. If you enable this option then stubs for
  1005. crypt(), setkey() and encrypt()
  1006. will be provided in a small libcrypt.
  1007. config UCLIBC_HAS_CRYPT
  1008. def_bool y
  1009. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  1010. endmenu
  1011. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  1012. bool "Networking Support"
  1013. default y
  1014. help
  1015. Say N here if you do not need network support.
  1016. if UCLIBC_HAS_NETWORK_SUPPORT
  1017. config UCLIBC_HAS_SOCKET
  1018. bool "Socket support"
  1019. default y
  1020. help
  1021. If you want to include support for sockets then answer Y.
  1022. config UCLIBC_HAS_IPV4
  1023. bool "IP version 4 support"
  1024. default y
  1025. select UCLIBC_HAS_SOCKET
  1026. help
  1027. If you want to include support for the Internet Protocol
  1028. (IP version 4) then answer Y.
  1029. Most people will say Y.
  1030. config UCLIBC_HAS_IPV6
  1031. bool "IP version 6 support"
  1032. select UCLIBC_HAS_SOCKET
  1033. help
  1034. If you want to include support for the next version of the Internet
  1035. Protocol (IP version 6) then answer Y.
  1036. Most people should answer N.
  1037. config UCLIBC_USE_NETLINK
  1038. bool "Use netlink to query interfaces"
  1039. depends on UCLIBC_HAS_SOCKET
  1040. help
  1041. In newer versions of Linux (2.4.17+), support was added for querying
  1042. network device information via netlink rather than the old style
  1043. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1044. it is smaller than netlink), but if you find that not all of your
  1045. devices are being returned by the if_nameindex() function, you will
  1046. have to use the netlink implementation.
  1047. Most people can safely answer N.
  1048. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1049. bool "Support the AI_ADDRCONFIG flag"
  1050. depends on UCLIBC_USE_NETLINK
  1051. help
  1052. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1053. implementation using netlink to query interfaces to find both
  1054. ipv4 and ipv6 support. This is only needed if an application uses
  1055. the AI_ADDRCONFIG flag.
  1056. Most people can safely answer N.
  1057. config UCLIBC_HAS_BSD_RES_CLOSE
  1058. bool "Support res_close() (bsd-compat)"
  1059. help
  1060. Answer Y if you desperately want to support BSD compatibility in
  1061. the network code.
  1062. Most people will say N.
  1063. config UCLIBC_HAS_COMPAT_RES_STATE
  1064. bool "Use compatible but bloated _res"
  1065. default y
  1066. help
  1067. Answer Y if you build network utilities and they muck with resolver
  1068. internals a lot (_res global structure). uclibc does not use most
  1069. of _res.XXX fields, and with this option OFF they won't even exist.
  1070. Which will make e.g. dig build fail.
  1071. Answering N saves around 400 bytes in bss.
  1072. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1073. bool "Use extra compatible but extra bloated _res"
  1074. help
  1075. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1076. As far as I can say, this should never be needed.
  1077. config UCLIBC_HAS_RESOLVER_SUPPORT
  1078. bool "DNS resolver functions"
  1079. select UCLIBC_HAS_COMPAT_RES_STATE
  1080. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1081. help
  1082. Provide implementations for DNS resolver functions.
  1083. In particular, the following functions will be added to the
  1084. library:
  1085. ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
  1086. res_mkquery, res_init, res_ninit, res_close, res_nclose
  1087. res_query, res_search, res_querydomain,
  1088. dn_expand, dn_comp,
  1089. ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
  1090. ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
  1091. ns_get16, ns_get32, ns_put16, ns_put32
  1092. endif
  1093. menu "String and Stdio Support"
  1094. config UCLIBC_HAS_STRING_GENERIC_OPT
  1095. bool "Use faster (but larger) generic string functions"
  1096. default y
  1097. help
  1098. Answer Y to use the (tweaked) glibc generic string functions.
  1099. In general, they are faster (but 3-5K larger) than the base
  1100. uClibc string functions which are optimized solely for size.
  1101. Many people will answer Y.
  1102. config UCLIBC_HAS_STRING_ARCH_OPT
  1103. bool "Use arch-specific assembly string functions (where available)"
  1104. default y
  1105. help
  1106. Answer Y to use any archtecture-specific assembly language string
  1107. functions available for this target plaform.
  1108. Note that assembly implementations are not available for all string
  1109. functions, so some generic (written in C) string functions may
  1110. still be used.
  1111. These are small and fast, the only reason _not_ to say Y here is
  1112. for debugging purposes.
  1113. config UCLIBC_HAS_STDIO_FUTEXES
  1114. bool "Use futexes for multithreaded I/O locking"
  1115. depends on UCLIBC_HAS_THREADS_NATIVE
  1116. help
  1117. If you want to compile uClibc to use futexes for low-level
  1118. I/O locking, answer Y. Otherwise, answer N.
  1119. config UCLIBC_HAS_CTYPE_TABLES
  1120. bool "Use Table Versions Of 'ctype.h' Functions."
  1121. default y
  1122. help
  1123. Answer Y to use table versions of the 'ctype.h' functions.
  1124. While the non-table versions are often smaller when building
  1125. statically linked apps, they work only in stub locale mode.
  1126. Most people will answer Y.
  1127. config UCLIBC_HAS_CTYPE_SIGNED
  1128. bool "Support Signed Characters In 'ctype.h' Functions."
  1129. depends on UCLIBC_HAS_CTYPE_TABLES
  1130. default y
  1131. help
  1132. Answer Y to enable support for passing signed char values to
  1133. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1134. these functions are only defined for unsigned char values and
  1135. EOF. However, glibc allows negative signed char values as well
  1136. in order to support 'broken old programs'.
  1137. Most people will answer Y.
  1138. choice
  1139. prompt "ctype argument checking"
  1140. depends on UCLIBC_HAS_CTYPE_TABLES
  1141. default UCLIBC_HAS_CTYPE_UNSAFE
  1142. help
  1143. Please select the invalid arg behavior you want for the 'ctype'
  1144. functions.
  1145. The 'ctype' functions are now implemented using table lookups, with
  1146. the arg being the index. This can result in incorrect memory accesses
  1147. or even segfaults for args outside of the allowed range.
  1148. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1149. the macro implementations.
  1150. config UCLIBC_HAS_CTYPE_UNSAFE
  1151. bool "Do not check -- unsafe"
  1152. config UCLIBC_HAS_CTYPE_CHECKED
  1153. bool "Detect and handle appropriately"
  1154. config UCLIBC_HAS_CTYPE_ENFORCED
  1155. bool "Issue a diagnostic and abort()"
  1156. endchoice
  1157. config UCLIBC_HAS_WCHAR
  1158. bool "Wide Character Support"
  1159. help
  1160. Answer Y to enable wide character support. This will make uClibc
  1161. much larger. It is also currently required for locale support.
  1162. Most people will answer N.
  1163. config UCLIBC_HAS_LIBICONV
  1164. bool "Iconv Support"
  1165. select UCLIBC_HAS_WCHAR
  1166. help
  1167. Add tiny iconv support for charset conversion from and to UTF-8.
  1168. config UCLIBC_HAS_LIBINTL
  1169. bool "Intl stubs support"
  1170. help
  1171. If you enable this option you get stubs for the gettext family of
  1172. functions.
  1173. config UCLIBC_HAS_LOCALE
  1174. bool "Locale Support"
  1175. select UCLIBC_HAS_WCHAR
  1176. select UCLIBC_HAS_CTYPE_TABLES
  1177. select UCLIBC_HAS_LIBICONV
  1178. help
  1179. uClibc now has full ANSI/ISO C99 locale support (except for
  1180. wcsftime() and collating items in regex). Be aware that enabling
  1181. this option will make uClibc much larger.
  1182. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1183. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1184. uClibc by around 300k. You can reduce this size by building your own
  1185. custom set of locate data (see extra/locale/LOCALES for details).
  1186. uClibc's locale support is still under development. For example,
  1187. codesets using shift states are not currently supported. Support is
  1188. planned in the next iteration of locale support.
  1189. Answer Y to enable locale support. Most people will answer N.
  1190. choice
  1191. prompt "Locale data"
  1192. depends on UCLIBC_HAS_LOCALE
  1193. default UCLIBC_BUILD_MINIMAL_LOCALE
  1194. config UCLIBC_BUILD_MINIMAL_LOCALE
  1195. bool "Only selected locales"
  1196. depends on UCLIBC_HAS_LOCALE
  1197. help
  1198. If you do not need all locales that are available on your
  1199. host-box, then set this to 'Y'.
  1200. config UCLIBC_BUILD_ALL_LOCALE
  1201. bool "All locales"
  1202. depends on UCLIBC_HAS_LOCALE
  1203. help
  1204. This builds all the locales that are available on your
  1205. host-box.
  1206. endchoice
  1207. config UCLIBC_BUILD_MINIMAL_LOCALES
  1208. string "locales to use"
  1209. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1210. default "en_US"
  1211. help
  1212. Space separated list of locales to use.
  1213. E.g.:
  1214. en_US en_GB de_AT
  1215. default:
  1216. en_US
  1217. config UCLIBC_HAS_XLOCALE
  1218. bool "Extended Locale Support (experimental/incomplete)"
  1219. depends on UCLIBC_HAS_LOCALE
  1220. help
  1221. Answer Y to enable extended locale support similar to that provided
  1222. by glibc. This is primarily intended to support libstd++
  1223. functionality.
  1224. However, it also allows thread-specific locale selection via
  1225. uselocale().
  1226. Most people will answer N.
  1227. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1228. bool "Support hexadecimal float notation"
  1229. depends on UCLIBC_HAS_CTYPE_TABLES
  1230. depends on UCLIBC_HAS_FLOATS
  1231. help
  1232. Answer Y to enable support for hexadecimal float notation in the
  1233. (wchar and) char string to floating point conversion functions, as
  1234. well as support for the %a and %A conversion specifiers in the
  1235. *printf() and *scanf() functions.
  1236. Most people will answer N.
  1237. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1238. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1239. depends on UCLIBC_HAS_LOCALE
  1240. depends on UCLIBC_HAS_FLOATS
  1241. help
  1242. Answer Y to enable support for glibc's \"'\" flag for allowing
  1243. locale-specific digit grouping in base 10 integer conversions and
  1244. appropriate floating point conversions in the *printf() and *scanf()
  1245. functions.
  1246. Most people will answer N.
  1247. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1248. bool "Do not require digit grouping when the \"'\" flag is specified"
  1249. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1250. default y
  1251. help
  1252. Answer Y to make digit grouping optional when the \"'\" flag is
  1253. specified.
  1254. This is the standard glibc behavior. If the initial string of digits
  1255. exceeds the maximum group number, the input will be treated as a
  1256. normal non-grouped number.
  1257. Most people will answer N.
  1258. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1259. bool "Support glibc's register_printf_function() (glibc-compat)"
  1260. depends on !USE_OLD_VFPRINTF
  1261. help
  1262. Answer Y to support glibc's register_printf_function() to allow an
  1263. application to add its own printf conversion specifiers.
  1264. parse_printf_format() is also enabled.
  1265. NOTE: Limits the number or registered specifiers to 10.
  1266. NOTE: Requires new conversion specifiers to be ASCII
  1267. characters (0-0x7f). This is to avoid problems with processing
  1268. format strings in locales with different multibyte conversions.
  1269. Most people will answer N.
  1270. config USE_OLD_VFPRINTF
  1271. bool "Use the old vfprintf implementation"
  1272. depends on !UCLIBC_HAS_WCHAR
  1273. help
  1274. Set to true to use the old vfprintf instead of the new. This is
  1275. roughly C89 compliant with some extensions, and is much smaller.
  1276. However, it does not support wide chars, positional args, or glibc
  1277. custom printf specifiers.
  1278. Most people will answer N.
  1279. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1280. int "Maximum number of positional args. Either 0 or >= 9."
  1281. depends on !USE_OLD_VFPRINTF
  1282. default 9
  1283. help
  1284. Set the maximum number of positional args supported by the
  1285. printf/scanf functions. The Single Unix Specification Version 3
  1286. requires a minimum value of 9. Setting this to a value lower than
  1287. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1288. in limits.h to be #undef'd.
  1289. WARNING! The workspace to support positional args is currently
  1290. allocated on the stack. You probably don't want to set
  1291. this to too high a value.
  1292. Most people will answer 9.
  1293. choice
  1294. prompt "Stdio buffer size"
  1295. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1296. help
  1297. Please select a value for BUFSIZ. This will be used by the
  1298. stdio subsystem as the default buffer size for a file, and
  1299. affects fopen(), setvbuf(), etc.
  1300. NOTE: Setting this to 'none' will disable buffering completely.
  1301. However, BUFSIZ will still be defined in stdio.h as 256 because
  1302. many applications use this value.
  1303. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1304. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1305. depends on !UCLIBC_HAS_WCHAR
  1306. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1307. bool "256 (minimum ANSI/ISO C99 value)"
  1308. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1309. bool "512"
  1310. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1311. bool "1024"
  1312. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1313. bool "2048"
  1314. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1315. bool "4096"
  1316. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1317. bool "8192"
  1318. # If you add more choices, you will need to update uClibc_stdio.h.
  1319. endchoice
  1320. choice
  1321. prompt "Stdio builtin buffer size (uClibc-specific)"
  1322. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1323. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1324. help
  1325. When a FILE is created with fopen(), an attempt is made to allocate
  1326. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1327. succeed but the FILE will be unbuffered.
  1328. This option adds a small amount of space to each FILE to act as an
  1329. emergency buffer in the event of a buffer allocation failure.
  1330. Most people will answer None.
  1331. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1332. bool "None"
  1333. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1334. bool "4"
  1335. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1336. bool "8"
  1337. # If you add more choices, you will need to update uClibc_stdio.h.
  1338. endchoice
  1339. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1340. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1341. help
  1342. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1343. a behavioral change made in SUSv3. Previously, abort() was required
  1344. to have the affect of fclose() on all open streams. The wording has
  1345. been changed to "may" from "shall".
  1346. Most people will answer N.
  1347. config UCLIBC_HAS_STDIO_GETC_MACRO
  1348. bool "Provide a macro version of getc()"
  1349. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1350. default y
  1351. help
  1352. Provide a macro version of getc().
  1353. Most people will answer Y.
  1354. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1355. bool "Provide a macro version of putc()"
  1356. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1357. default y
  1358. help
  1359. Provide a macro version of putc().
  1360. Most people will answer Y.
  1361. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1362. bool "Support auto-r/w transition"
  1363. default y
  1364. help
  1365. Answer Y to enable the stdio subsystem to automaticly transition
  1366. between reading and writing. This relaxes the ANSI/ISO C99
  1367. requirement:
  1368. When a file is opened with update mode ('+' as the second or third
  1369. character in the list of mode argument values), both input and output
  1370. may be performed on the associated stream. However, output shall not
  1371. be directly followed by input without an intervening call to the
  1372. fflush function or to a file positioning function (fseek, fsetpos,
  1373. or rewind), and input shall not be directly followed by output without
  1374. an intervening call to a file positioning function, unless the input
  1375. operation encounters end­of­file.
  1376. Most people will answer Y.
  1377. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1378. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1379. help
  1380. Answer Y to enable a uClibc-specific extension to allow passing an
  1381. additional 'F' flag in the mode string for fopen() to specify that
  1382. the file should be open()ed with the O_LARGEFILE flag set.
  1383. Most people will answer N.
  1384. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1385. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1386. help
  1387. Answer Y to support a glibc extension to allow passing
  1388. additional 'x' flag in the mode string for fopen() to specify that
  1389. the file should be open()ed with the O_EXCL flag set.
  1390. Most people will answer N.
  1391. config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
  1392. bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
  1393. help
  1394. Answer Y to support a glibc extension to allow passing
  1395. additional 'e' flag in the mode string for fopen() to specify that
  1396. the file should be open()ed with the O_CLOEXEC flag set.
  1397. Most people will answer N.
  1398. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1399. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1400. help
  1401. Answer Y to support the glibc 'custom stream' extension functions
  1402. fmemopen(), open_memstream(), and fopencookie().
  1403. NOTE: There are some minor differences regarding seeking behavior.
  1404. Most people will answer N.
  1405. config UCLIBC_HAS_PRINTF_M_SPEC
  1406. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1407. help
  1408. Answer Y to support a glibc extension to interpret '%m' in printf
  1409. format strings as an instruction to output the error message string
  1410. (as generated by strerror) corresponding to the current value of
  1411. 'errno'.
  1412. Most people will answer N.
  1413. config UCLIBC_HAS_ERRNO_MESSAGES
  1414. bool "Include the errno message text in the library"
  1415. default y
  1416. help
  1417. Answer Y if you want to include the errno message text in the
  1418. library. This adds about 3K to the library, but enables strerror()
  1419. to generate text other than 'Unknown error <number>'.
  1420. Most people will answer Y.
  1421. config UCLIBC_HAS_SYS_ERRLIST
  1422. bool "Support sys_errlist[] (obsolete-compat)"
  1423. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1424. help
  1425. Answer Y if you want to support the obsolete sys_errlist[].
  1426. This adds about 0.5k to the library, except for the mips
  1427. arch where it adds over 4K.
  1428. WARNING! In the future, support for sys_errlist[] may be unavailable
  1429. in at least some configurations. In fact, it may be removed
  1430. altogether.
  1431. Most people will answer N.
  1432. Application writers: use the strerror(3) function.
  1433. config UCLIBC_HAS_SIGNUM_MESSAGES
  1434. bool "Include the signum message text in the library"
  1435. default y
  1436. help
  1437. Answer Y if you want to include the signum message text in the
  1438. library. This adds about 0.5K to the library, but enables strsignal()
  1439. to generate text other than 'Unknown signal <number>'.
  1440. Most people will answer Y.
  1441. config UCLIBC_HAS_SYS_SIGLIST
  1442. bool "Support sys_siglist[] (bsd-compat)"
  1443. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1444. help
  1445. Answer Y if you want to support sys_siglist[].
  1446. WARNING! In the future, support for sys_siglist[] may be unavailable
  1447. in at least some configurations. In fact, it may be removed
  1448. altogether.
  1449. Most people will answer N.
  1450. config UCLIBC_HAS_GNU_GETOPT
  1451. bool "Support gnu getopt"
  1452. default y
  1453. help
  1454. Answer Y if you want to include full gnu getopt() instead of a
  1455. (much smaller) SUSv3 compatible getopt().
  1456. Note that getopt_long, getopt_long_only as well as getsubopt
  1457. are implemented on top of this choice.
  1458. Most people will answer Y.
  1459. config UCLIBC_HAS_GETOPT_LONG
  1460. bool "Support getopt_long/getopt_long_only (glibc-compat)"
  1461. default y
  1462. help
  1463. Answer Y if you want to include getopt_long[_only()] used by many
  1464. apps.
  1465. Most people will answer Y.
  1466. config UCLIBC_HAS_GNU_GETSUBOPT
  1467. bool "Support getsubopt"
  1468. default y
  1469. help
  1470. Answer Y if you want to include getsubopt().
  1471. Most people will answer Y.
  1472. config UCLIBC_HAS_ARGP
  1473. bool "Support argp"
  1474. select UCLIBC_HAS_GETOPT_LONG
  1475. select UCLIBC_HAS_GNU_GETOPT
  1476. select UCLIBC_HAS_WCHAR
  1477. default n
  1478. help
  1479. Argp is an interface for parsing unix-style argument vectors. Unlike
  1480. the common getopt interface, it provides many advanced features in
  1481. addition to parsing options, such as automatic output in response to
  1482. `--help' and `--version' options.
  1483. A library can export an argp option parser, which programs can easily
  1484. use in conjunction with their own option parser.
  1485. Argp support is needed by elfutils libdw.
  1486. Most people can safely answer N.
  1487. endmenu
  1488. menu "Big and Tall"
  1489. config UCLIBC_HAS_REGEX
  1490. bool "Regular Expression Support"
  1491. default y
  1492. help
  1493. POSIX regular expression code is really big -- 53k all by itself.
  1494. If you don't use regular expressions, turn this off and save space.
  1495. Of course, if you only statically link, leave this on, since it will
  1496. only be included in your apps if you use regular expressions.
  1497. config UCLIBC_HAS_FNMATCH
  1498. bool "fnmatch Support"
  1499. default y
  1500. help
  1501. POSIX fnmatch.
  1502. config UCLIBC_HAS_WORDEXP
  1503. bool "Support the wordexp() interface"
  1504. depends on UCLIBC_HAS_GLOB
  1505. help
  1506. The SuSv3 wordexp() interface performs word expansions per the Shell
  1507. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1508. intended for use by applications that want to implement all of the
  1509. standard Bourne shell expansions on input data.
  1510. This interface is rarely used, and very large. Unless you have a
  1511. pressing need for wordexp(), you should probably answer N.
  1512. config UCLIBC_HAS_NFTW
  1513. bool "Support the nftw() interface"
  1514. help
  1515. The SuSv3 nftw() interface is used to recursively descend
  1516. directory paths while repeatedly calling a function.
  1517. This interface is rarely used, and adds around 4.5k. Unless you have
  1518. a pressing need for nftw(), you should probably answer N.
  1519. config UCLIBC_HAS_FTW
  1520. bool "Support the ftw() interface (SUSv4-obsolete)"
  1521. depends on UCLIBC_SUSV4_LEGACY
  1522. help
  1523. The SuSv3 ftw() interface is used to recursively descend
  1524. directory paths while repeatedly calling a function.
  1525. This interface is rarely used, and adds around 4.5k. Unless you have
  1526. a pressing need for ftw(), you should probably answer N.
  1527. config UCLIBC_HAS_FTS
  1528. bool "Support the fts() interface (bsd-compat)"
  1529. help
  1530. The fts functions are provided for traversing UNIX file hierarchies.
  1531. This interface is currently used by the elfutils and adds
  1532. around 7.5k.
  1533. You should port your application to use the POSIX nftw()
  1534. interface.
  1535. Unless you need to build/use elfutils, you should prolly answer N.
  1536. config UCLIBC_HAS_GLOB
  1537. bool "Support the glob() interface"
  1538. depends on UCLIBC_HAS_FNMATCH
  1539. default y
  1540. help
  1541. The glob interface is somewhat large (weighing in at about 2,5k). It
  1542. is used fairly often, but is an option since people wanting to go for
  1543. absolute minimum size may wish to omit it.
  1544. Most people will answer Y.
  1545. config UCLIBC_HAS_GNU_GLOB
  1546. bool "Support gnu glob() interface"
  1547. depends on UCLIBC_HAS_GLOB
  1548. help
  1549. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1550. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1551. from glibc and does not support all the GNU specific options.
  1552. Answer Y if you want to include full gnu glob() instead of the smaller
  1553. SUSv3 compatible glob().
  1554. Most people will answer N.
  1555. endmenu
  1556. menu "Library Installation Options"
  1557. config RUNTIME_PREFIX
  1558. string "uClibc runtime library directory"
  1559. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1560. help
  1561. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1562. libraries will be installed. The result will look something
  1563. like the following:
  1564. $(RUNTIME_PREFIX)/
  1565. lib/ <contains all runtime libraries>
  1566. usr/bin/ldd <the ldd utility program>
  1567. sbin/ldconfig <the ldconfig utility program>
  1568. This value is used by the 'make install' Makefile target. Since this
  1569. directory is compiled into the shared library loader, you will need to
  1570. recompile uClibc if you change this value...
  1571. For a typical target system this should be set to "/", such that
  1572. 'make install' will install /lib/libuClibc-<VERSION>.so
  1573. config DEVEL_PREFIX
  1574. string "uClibc development environment directory"
  1575. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1576. help
  1577. DEVEL_PREFIX is the directory into which the uClibc development
  1578. environment will be installed. The result will look something
  1579. like the following:
  1580. $(DEVEL_PREFIX)/
  1581. lib/ <contains static libs>
  1582. include/ <Where all the header files go>
  1583. This value is used by the 'make install' Makefile target when
  1584. installing a uClibc development environment.
  1585. For a typical target system this should be set to "/usr", such that
  1586. 'make install' will install /usr/include/<header files>.
  1587. config MULTILIB_DIR
  1588. string "library path component"
  1589. default "lib"
  1590. help
  1591. Path component where libraries reside.
  1592. For a typical target system this should be set to "lib", such that
  1593. 'make install' will install libraries to "/lib" and "/usr/lib"
  1594. respectively
  1595. DEVEL_PREFIX/MULTILIB_DIR
  1596. RUNTIME_PREFIX/MULTILIB_DIR
  1597. Other settings may include "lib32" or "lib64".
  1598. config HARDWIRED_ABSPATH
  1599. bool "Hardwire absolute paths into linker scripts"
  1600. default y
  1601. help
  1602. This prepends absolute paths to the libraries mentioned in linker
  1603. scripts such as libc.so.
  1604. This is a build time optimization. It has no impact on dynamic
  1605. linking at runtime, which doesn't use linker scripts.
  1606. You must disable this to use uClibc with old non-sysroot toolchains,
  1607. such as the prebuilt binary cross compilers at:
  1608. http://uclibc.org/downloads/binaries
  1609. The amount of time saved by this optimization is actually too small to
  1610. measure. The linker just had to search the library path to find the
  1611. linker script, so the dentries are cache hot if it has to search the
  1612. same path again. But it's what glibc does, so we do it too.
  1613. endmenu
  1614. menu "Security options"
  1615. config UCLIBC_BUILD_PIE
  1616. bool "Build utilities as ET_DYN/PIE executables"
  1617. depends on HAVE_SHARED
  1618. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_nds32
  1619. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1620. help
  1621. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1622. executables.
  1623. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1624. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1625. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1626. all libraries have to be built with -fPIC or -fpic, and all
  1627. assembler functions must be written as position independent
  1628. code (PIC).
  1629. config UCLIBC_HAS_ARC4RANDOM
  1630. bool "Include the arc4random() function"
  1631. help
  1632. Answer Y to support the OpenBSD-like arc4random() function. This
  1633. function picks a random number between 0 and N, and will always return
  1634. something even if the random driver is dead. If urandom fails then
  1635. gettimeofday(2) will be used as the random seed. This function is
  1636. designed to be more dependable than invoking /dev/urandom directly.
  1637. OpenSSL and OpenNTPD currently support this function.
  1638. Most people will answer N.
  1639. config ARC4RANDOM_USES_NODEV
  1640. bool "Do not use /dev/urandom with arc4random()"
  1641. depends on UCLIBC_HAS_ARC4RANDOM
  1642. help
  1643. Answer Y to use gettimeofday(2) and getpid(2) exclusively for
  1644. arc4random(). This is not a bad idea for a diskless system, but
  1645. it uses a lot of syscalls to stir each array element.
  1646. Most people will answer N.
  1647. config HAVE_NO_SSP
  1648. bool
  1649. config UCLIBC_HAS_SSP
  1650. bool "Support for GCC stack smashing protector"
  1651. depends on !HAVE_NO_SSP
  1652. help
  1653. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1654. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1655. the needed functions are added to ldso/libc instead.
  1656. GCC's stack protector is a reimplementation of IBM's propolice.
  1657. See http://www.trl.ibm.com/projects/security/ssp/ and
  1658. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1659. for details.
  1660. Note that NOEXECSTACK on a kernel with address space randomization
  1661. is generally sufficient to prevent most buffer overflow exploits
  1662. without increasing code size. This option essentially adds debugging
  1663. code to catch them.
  1664. Most people will answer N.
  1665. config SSP_QUICK_CANARY
  1666. bool "Use simple guard values without accessing /dev/urandom"
  1667. depends on UCLIBC_HAS_SSP
  1668. help
  1669. Use gettimeofday(2) to define the __guard without accessing
  1670. /dev/urandom.
  1671. WARNING: This makes smashing stack protector vulnerable to timing
  1672. attacks.
  1673. Most people will answer N.
  1674. choice
  1675. prompt "Propolice protection blocking signal"
  1676. depends on UCLIBC_HAS_SSP
  1677. depends on DODEBUG
  1678. default PROPOLICE_BLOCK_SEGV
  1679. help
  1680. "abort" use SIGABRT to block offending programs.
  1681. This is the default implementation.
  1682. "segfault" use SIGSEGV to block offending programs.
  1683. Use this for debugging.
  1684. If unsure, answer "abort".
  1685. config PROPOLICE_BLOCK_ABRT
  1686. bool "abort"
  1687. config PROPOLICE_BLOCK_SEGV
  1688. bool "segfault"
  1689. endchoice
  1690. config UCLIBC_BUILD_SSP
  1691. bool "Build uClibc with -fstack-protector"
  1692. depends on UCLIBC_HAS_SSP
  1693. help
  1694. Build all uClibc libraries and executables with -fstack-protector,
  1695. adding extra stack overflow checking to most uClibc functions.
  1696. config UCLIBC_BUILD_RELRO
  1697. bool "Build uClibc with linker option -z RELRO"
  1698. depends on HAVE_SHARED
  1699. default y
  1700. help
  1701. Build all libraries and executables with "ld -z relro".
  1702. This tells the linker to mark chunks of an executable or shared
  1703. library read-only after applying dynamic relocations. (This comes
  1704. up when a global const variable is initialized to the address of a
  1705. function or the value of another global variable.)
  1706. This is a fairly obscure option the ld man page doesn't even bother
  1707. to document properly. It's a security paranoia issue that's more
  1708. likely to consume memory (by allocating an extra page) rather than
  1709. save it.
  1710. This is explained in more depth at
  1711. http://www.airs.com/blog/archives/189
  1712. Nobody is likely to care whether you say Y or N here.
  1713. config UCLIBC_BUILD_NOW
  1714. bool "Build uClibc with linker option -z NOW"
  1715. depends on HAVE_SHARED
  1716. help
  1717. Build all libraries and executables with "ld -z now".
  1718. This tells the linker to resolve all symbols when the library is
  1719. first loaded, rather than when each function is first called. This
  1720. increases start-up latency by a few microseconds and may do
  1721. unnecessary work (resolving symbols that are never used), but the
  1722. realtime people like it for making microbenchmark timings slightly
  1723. more predictable and in some cases it can be slightly faster due to
  1724. CPU cache behavior (not having to fault the linker back in to do
  1725. lazy symbol resolution).
  1726. Most people can't tell the difference between selecting Y or N here.
  1727. config UCLIBC_BUILD_NOEXECSTACK
  1728. bool "Build uClibc with noexecstack marking"
  1729. default y
  1730. help
  1731. Mark all assembler files as noexecstack, which will mark uClibc
  1732. as not requiring an executable stack. (This doesn't prevent other
  1733. files you link against from claiming to need an executable stack, it
  1734. just won't cause uClibc to request it unnecessarily.)
  1735. This is a security thing to make buffer overflows harder to exploit.
  1736. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1737. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1738. It only actually provides any security when combined with address
  1739. space randomization, explained here: http://lwn.net/Articles/121845/
  1740. Address space randomization is on by default in current linux
  1741. kernels (although it can be disabled using the option
  1742. CONFIG_COMPAT_BRK).
  1743. You should probably say Y.
  1744. endmenu
  1745. menu "Development/debugging options"
  1746. config CROSS_COMPILER_PREFIX
  1747. string "Cross-compiling toolchain prefix"
  1748. default ""
  1749. help
  1750. The prefix used to execute your cross-compiling toolchain. For
  1751. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1752. then enter 'arm-linux-uclibc-' here.
  1753. config UCLIBC_EXTRA_CFLAGS
  1754. string "Extra CFLAGS"
  1755. default ""
  1756. help
  1757. Add any additional CFLAGS to be used to build uClibc.
  1758. config DODEBUG
  1759. bool "Enable debugging symbols"
  1760. select EXTRA_WARNINGS
  1761. help
  1762. Say Y here if you wish to compile uClibc with debugging symbols.
  1763. This will allow you to use a debugger to examine uClibc internals
  1764. while applications are running. This increases the size of the
  1765. library considerably and should only be used when doing development.
  1766. If you are doing development and want to debug uClibc, answer Y.
  1767. Otherwise, answer N.
  1768. config DODEBUG_PT
  1769. bool "Build pthread with debugging output"
  1770. depends on UCLIBC_HAS_THREADS && UCLIBC_HAS_LINUXTHREADS
  1771. help
  1772. Enable debug output in libpthread. This is only useful when doing
  1773. development in libpthread itself.
  1774. Otherwise, answer N.
  1775. config DOSTRIP
  1776. bool "Strip libraries and executables"
  1777. default y
  1778. depends on !DODEBUG
  1779. help
  1780. Say Y here if you do wish to strip all uClibc libraries and
  1781. executables. No stripping increases the size of the binaries
  1782. considerably, but makes it possible to debug uClibc libraries.
  1783. Most people will answer Y.
  1784. config DOASSERTS
  1785. bool "Build with run-time assertion testing"
  1786. help
  1787. Say Y here to include runtime assertion tests.
  1788. This enables runtime assertion testing in some code, which can
  1789. increase the size of the library and incur runtime overhead.
  1790. If you say N, then this testing will be disabled.
  1791. config SUPPORT_LD_DEBUG
  1792. bool "Build the shared library loader with debugging support"
  1793. depends on HAVE_SHARED
  1794. help
  1795. Answer Y here to enable all the extra code needed to debug the uClibc
  1796. native shared library loader. The level of debugging noise that is
  1797. generated depends on the LD_DEBUG environment variable... Just set
  1798. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1799. debug your application. Diagnostic messages will then be printed to
  1800. the stderr.
  1801. For now these debugging tokens are available:
  1802. detail provide more information for some options
  1803. move display copy processing
  1804. symbols display symbol table processing
  1805. reloc display relocation processing; detail shows the
  1806. relocation patch
  1807. nofixups never fixes up jump relocations
  1808. bindings displays the resolve processing (function calls);
  1809. detail shows the relocation patch
  1810. all Enable everything!
  1811. The additional environment variable:
  1812. LD_DEBUG_OUTPUT=file
  1813. redirects the diagnostics to an output file created using
  1814. the specified name and the process id as a suffix.
  1815. An excellent start is simply:
  1816. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1817. or to log everything to a file named 'logfile', try this
  1818. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1819. If you are doing development and want to debug uClibc's shared library
  1820. loader, answer Y. Mere mortals answer N.
  1821. config SUPPORT_LD_DEBUG_EARLY
  1822. bool "Build the shared library loader with early debugging support"
  1823. depends on HAVE_SHARED
  1824. help
  1825. Answer Y here to if you find the uClibc shared library loader is
  1826. crashing or otherwise not working very early on. This is typical
  1827. only when starting a new port when you haven't figured out how to
  1828. properly get the values for argc, argv, environ, etc. This method
  1829. allows a degree of visibility into the very early shared library
  1830. loader initialization process. If you are doing development and want
  1831. to debug the uClibc shared library loader early initialization,
  1832. answer Y. Mere mortals answer N.
  1833. config UCLIBC_MALLOC_DEBUGGING
  1834. bool "Build malloc with debugging support"
  1835. depends on MALLOC || MALLOC_STANDARD
  1836. select DOASSERTS
  1837. help
  1838. Answer Y here to compile extra debugging support code into malloc.
  1839. Malloc debugging output may then be enabled at runtime using the
  1840. MALLOC_DEBUG environment variable.
  1841. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1842. as a bitmask with the following bits:
  1843. 1 - do extra consistency checking
  1844. 2 - output messages for malloc/free calls and OS
  1845. allocation calls
  1846. 4 - output messages for the `MMB' layer
  1847. 8 - output messages for internal malloc heap manipulation
  1848. calls
  1849. Because this increases the size of malloc appreciably (due to strings
  1850. etc), you should say N unless you need to debug a malloc problem.
  1851. config UCLIBC_HAS_BACKTRACE
  1852. bool "Add support for application self-debugging"
  1853. depends on HAVE_SHARED
  1854. help
  1855. Answer Y here to compile support for application self-debugging that
  1856. provides the following new functions:
  1857. backtrace, backtrace_symbols, backtrace_symbols_fd
  1858. The backtrace functionality is currently supported on some platforms, and it
  1859. based on dwarf2 informations to properly work, so any application that
  1860. want to use backtrace needs to be built with -fexceptions flag.
  1861. The symbol names may be unavailable without the use of special linker
  1862. options. For systems using the GNU linker, it is necessary to use the
  1863. -rdynamic linker option too. Note that names of "static" functions are not
  1864. exposed, and won't be available in the backtrace.
  1865. config WARNINGS
  1866. string "Compiler Warnings"
  1867. default "-Wall"
  1868. help
  1869. Set this to the set of compiler warnings you wish to see while compiling.
  1870. config EXTRA_WARNINGS
  1871. bool "Enable extra annoying warnings"
  1872. help
  1873. If you wish to build with extra warnings enabled, say Y here.
  1874. endmenu