Config.in 71 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_sparc64 if DESIRED_TARGET_ARCH = "sparc64"
  38. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  39. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  40. help
  41. The architecture of your target.
  42. config TARGET_aarch64
  43. bool "aarch64"
  44. config TARGET_alpha
  45. bool "alpha"
  46. config TARGET_arc
  47. bool "arc"
  48. config TARGET_arm
  49. bool "arm"
  50. config TARGET_avr32
  51. bool "avr32"
  52. config TARGET_bfin
  53. bool "bfin"
  54. # someone could sync this tree:
  55. # http://linux-c6x.org/git/?p=uClibc.git;a=summary
  56. config TARGET_c6x
  57. bool "c6x"
  58. config TARGET_cris
  59. bool "cris"
  60. config TARGET_frv
  61. bool "frv"
  62. config TARGET_h8300
  63. bool "h8300"
  64. config TARGET_hppa
  65. bool "hppa"
  66. config TARGET_i386
  67. bool "i386"
  68. config TARGET_ia64
  69. bool "ia64"
  70. config TARGET_lm32
  71. bool "lm32"
  72. config TARGET_m68k
  73. bool "m68k"
  74. config TARGET_metag
  75. bool "metag"
  76. config TARGET_microblaze
  77. bool "microblaze"
  78. config TARGET_mips
  79. bool "mips"
  80. config TARGET_nds32
  81. bool "nds32"
  82. config TARGET_nios2
  83. bool "nios2"
  84. config TARGET_or1k
  85. bool "or1k"
  86. config TARGET_powerpc
  87. bool "powerpc"
  88. config TARGET_sh
  89. bool "superh"
  90. config TARGET_sparc
  91. bool "sparc"
  92. config TARGET_sparc64
  93. bool "sparc64"
  94. config TARGET_x86_64
  95. bool "x86_64"
  96. config TARGET_xtensa
  97. bool "xtensa"
  98. endchoice
  99. menu "Target Architecture Features and Options"
  100. if TARGET_aarch64
  101. source "extra/Configs/Config.aarch64"
  102. endif
  103. if TARGET_alpha
  104. source "extra/Configs/Config.alpha"
  105. endif
  106. if TARGET_arm
  107. source "extra/Configs/Config.arm"
  108. endif
  109. if TARGET_avr32
  110. source "extra/Configs/Config.avr32"
  111. endif
  112. if TARGET_bfin
  113. source "extra/Configs/Config.bfin"
  114. endif
  115. if TARGET_cris
  116. source "extra/Configs/Config.cris"
  117. endif
  118. if TARGET_frv
  119. source "extra/Configs/Config.frv"
  120. endif
  121. if TARGET_h8300
  122. source "extra/Configs/Config.h8300"
  123. endif
  124. if TARGET_hppa
  125. source "extra/Configs/Config.hppa"
  126. endif
  127. if TARGET_i386
  128. source "extra/Configs/Config.i386"
  129. endif
  130. if TARGET_ia64
  131. source "extra/Configs/Config.ia64"
  132. endif
  133. if TARGET_lm32
  134. source "extra/Configs/Config.lm32"
  135. endif
  136. if TARGET_m68k
  137. source "extra/Configs/Config.m68k"
  138. endif
  139. if TARGET_metag
  140. source "extra/Configs/Config.metag"
  141. endif
  142. if TARGET_nds32
  143. source "extra/Configs/Config.nds32"
  144. endif
  145. if TARGET_nios2
  146. source "extra/Configs/Config.nios2"
  147. endif
  148. if TARGET_microblaze
  149. source "extra/Configs/Config.microblaze"
  150. endif
  151. if TARGET_mips
  152. source "extra/Configs/Config.mips"
  153. endif
  154. if TARGET_or1k
  155. source "extra/Configs/Config.or1k"
  156. endif
  157. if TARGET_powerpc
  158. source "extra/Configs/Config.powerpc"
  159. endif
  160. if TARGET_sh
  161. source "extra/Configs/Config.sh"
  162. endif
  163. if TARGET_sparc
  164. source "extra/Configs/Config.sparc"
  165. endif
  166. if TARGET_sparc64
  167. source "extra/Configs/Config.sparc64"
  168. endif
  169. if TARGET_x86_64
  170. source "extra/Configs/Config.x86_64"
  171. endif
  172. if TARGET_xtensa
  173. source "extra/Configs/Config.xtensa"
  174. endif
  175. if TARGET_c6x
  176. source "extra/Configs/Config.c6x"
  177. endif
  178. if TARGET_arc
  179. source "extra/Configs/Config.arc"
  180. endif
  181. config TARGET_SUBARCH
  182. string
  183. default "e500" if CONFIG_E500
  184. default "classic" if CONFIG_CLASSIC
  185. default "sh4" if CONFIG_SH4
  186. default "sh4" if CONFIG_SH4A
  187. default "" if CONFIG_386
  188. default "i486" if CONFIG_486
  189. default "i586" if CONFIG_586
  190. default "i686" if CONFIG_686
  191. default "arcv2" if CONFIG_ARC_CPU_HS
  192. default ""
  193. source "extra/Configs/Config.in.arch"
  194. endmenu
  195. menu "General Library Settings"
  196. config HAVE_NO_PIC
  197. bool
  198. config DOPIC
  199. bool "Generate only Position Independent Code (PIC)"
  200. default y
  201. depends on !HAVE_NO_PIC
  202. help
  203. If you wish to build all of uClibc as PIC objects, then answer Y here.
  204. If you are unsure, then you should answer N.
  205. config ARCH_HAS_NO_SHARED
  206. bool
  207. config ARCH_HAS_NO_LDSO
  208. bool
  209. select ARCH_HAS_NO_SHARED
  210. config ARCH_HAS_UCONTEXT
  211. bool
  212. config HAVE_SHARED
  213. bool "Enable shared libraries"
  214. depends on !ARCH_HAS_NO_SHARED
  215. default y
  216. help
  217. If you wish to build uClibc with support for shared libraries then
  218. answer Y here. If you only want to build uClibc as a static library,
  219. then answer N.
  220. config FORCE_SHAREABLE_TEXT_SEGMENTS
  221. bool "Only load shared libraries which can share their text segment"
  222. depends on HAVE_SHARED
  223. select DOPIC
  224. help
  225. If you answer Y here, the uClibc native shared library loader will
  226. only load shared libraries, which do not need to modify any
  227. non-writable segments. These libraries haven't set the DT_TEXTREL
  228. tag in the dynamic section (==> objdump).
  229. All your libraries must be compiled with -fPIC or -fpic, and all
  230. assembler function must be written as position independent code (PIC).
  231. Enabling this option will make uClibc's shared library loader a
  232. little bit smaller and guarantee that no memory will be wasted by
  233. badly coded shared libraries.
  234. config LDSO_LDD_SUPPORT
  235. bool "Native 'ldd' support"
  236. depends on HAVE_SHARED
  237. default y
  238. help
  239. Enable all the code needed to support traditional ldd,
  240. which executes the shared library loader to resolve all dependencies
  241. and then provide a list of shared libraries that are required for an
  242. application to function. Disabling this option will make uClibc's
  243. shared library loader a little bit smaller.
  244. Most people will answer Y.
  245. config LDSO_CACHE_SUPPORT
  246. bool "Enable library loader cache (ld.so.conf)"
  247. depends on HAVE_SHARED
  248. default y
  249. help
  250. Enable this to make use of /etc/ld.so.conf, the shared library loader
  251. cache configuration file to support for non-standard library paths.
  252. After updating this file, it is necessary to run 'ldconfig' to update
  253. the /etc/ld.so.cache shared library loader cache file.
  254. config LDSO_PRELOAD_ENV_SUPPORT
  255. bool "Enable library loader LD_PRELOAD environment"
  256. depends on HAVE_SHARED
  257. default y
  258. help
  259. Enable this to make use of LD_PRELOAD environment variable.
  260. A whitespace-separated list of additional, user-specified, ELF shared
  261. libraries to be loaded before all others. This can be used to
  262. selectively override functions in other shared libraries. For
  263. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  264. search directories that are also set-user-ID will be loaded.
  265. config LDSO_PRELOAD_FILE_SUPPORT
  266. bool "Enable library loader preload file (ld.so.preload)"
  267. depends on HAVE_SHARED
  268. help
  269. Enable this to make use of /etc/ld.so.preload. This file contains a
  270. whitespace separated list of shared libraries to be loaded before
  271. the program.
  272. config LDSO_BASE_FILENAME
  273. string "Shared library loader naming prefix"
  274. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  275. default "ld.so"
  276. help
  277. If you wish to support both uClibc and glibc on the same system, it
  278. is necessary to set this to something other than "ld.so" to avoid
  279. conflicts with glibc, which also uses "ld.so". This prevents both
  280. libraries from using the same /etc/ld.so.* files. If you wish to
  281. support both uClibc and glibc on the same system then you should set
  282. this to "ld-uClibc.so".
  283. Most people will leave this set to the default of "ld.so".
  284. WARNING: Changing the default prefix could cause problems with
  285. binutils' ld !
  286. config LDSO_STANDALONE_SUPPORT
  287. bool "Dynamic linker stand-alone mode support"
  288. depends on HAVE_SHARED
  289. help
  290. The dynamic linker can be run either indirectly through running some
  291. dynamically linked program or library (in which case no command line
  292. options to the dynamic linker can be passed and, in the ELF case, the
  293. dynamic linker which is stored in the .interp section of the program
  294. is executed) or directly by running:
  295. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  296. Stand-alone execution is a prerequisite for adding prelink
  297. capabilities to uClibc dynamic linker, as well useful for testing an
  298. updated version of the dynamic linker without breaking the system.
  299. config LDSO_PRELINK_SUPPORT
  300. bool "Dynamic linker prelink support"
  301. depends on HAVE_SHARED
  302. select LDSO_STANDALONE_SUPPORT
  303. help
  304. The dynamic linker can be used in stand-alone mode by the prelink tool
  305. for prelinking ELF shared libraries and binaries to speed up startup
  306. time. It also is able to load and handle prelinked libraries and
  307. binaries at runtime.
  308. config UCLIBC_STATIC_LDCONFIG
  309. bool "Link ldconfig statically"
  310. depends on HAVE_SHARED
  311. default y
  312. help
  313. Enable this option to statically link the ldconfig binary.
  314. Making ldconfig static can be beneficial if you have a library
  315. problem and need to use ldconfig to recover. Sometimes it is
  316. preferable to instead keep the size of the system down, in which
  317. case you should disable this option.
  318. config LDSO_RUNPATH
  319. bool "Enable ELF RUNPATH tag support"
  320. depends on HAVE_SHARED
  321. default y if LDSO_CACHE_SUPPORT
  322. help
  323. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  324. which extend the library search paths. They are really only useful
  325. if a package installs libraries in non standard locations and
  326. ld.so.conf support is disabled.
  327. Usage of RUNPATH tags is not too common, so disabling this feature
  328. should be safe for most people.
  329. config LDSO_RUNPATH_OF_EXECUTABLE
  330. bool "Use executables RUNPATH/RPATH when searching for libraries."
  331. depends on LDSO_RUNPATH
  332. default n
  333. help
  334. Use the executables RUNPATH/RPATH to find to find libraries even
  335. though this behavour is not standard. Setting this option causes
  336. the uclibc dynamic linker behavour to match the glibc dynamic linker.
  337. config LDSO_SAFE_RUNPATH
  338. bool "Allow only RUNPATH beginning with /"
  339. depends on LDSO_RUNPATH
  340. default y
  341. help
  342. Allow only absolute path in RPATH/RUNPATH.
  343. config LDSO_SEARCH_INTERP_PATH
  344. bool "Add ldso path to lib search path"
  345. depends on HAVE_SHARED
  346. default y
  347. help
  348. The ldso is told where it is being executed from and can use that
  349. path to find related core libraries. This is useful by default,
  350. but can be annoying in a mixed development environment.
  351. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  352. library search with /foo/boo/
  353. If unsure, simply say Y here.
  354. config LDSO_LD_LIBRARY_PATH
  355. bool "Add LD_LIBRARY_PATH to lib search path"
  356. depends on HAVE_SHARED
  357. default y
  358. help
  359. On hardened system it could be useful to disable the use of
  360. LD_LIBRARY_PATH environment variable (a colon-separated list of
  361. directories in which to search for ELF libraries at execution-time).
  362. If unsure, simply say Y here.
  363. config LDSO_NO_CLEANUP
  364. bool "Disable automatic unloading of dynamically loaded shared objects"
  365. depends on HAVE_SHARED
  366. help
  367. If you need complete allocation traces when debugging memory leaks
  368. using Valgrind in a process that dynamically loads shared objects,
  369. then answer Y here. Unlike glibc, uClibc unloads all dynamically
  370. loaded shared objects when a process exits, which prevents Valgrind
  371. from correctly resolving the symbols from the unloaded shared objects.
  372. Unless you know you need this, you should answer N.
  373. config UCLIBC_CTOR_DTOR
  374. bool
  375. default y
  376. help
  377. If you wish to build uClibc with support for global constructor
  378. (ctor) and global destructor (dtor) support, then answer Y here.
  379. When ctor/dtor support is enabled, binaries linked with uClibc must
  380. also be linked with crtbegin.o and crtend.o which are provided by gcc
  381. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  382. may need to be adjusted to include these files). This support will
  383. also add a small amount of additional size to each binary compiled vs
  384. uClibc. If you will be using uClibc with C++, or if you need the gcc
  385. __attribute__((constructor)) and __attribute__((destructor)) to work,
  386. then you definitely want to answer Y here. If you don't need ctors
  387. or dtors and want your binaries to be as small as possible, then
  388. answer N.
  389. config LDSO_GNU_HASH_SUPPORT
  390. bool "Enable GNU hash style support"
  391. depends on HAVE_SHARED
  392. help
  393. Newest binutils support a new hash style named GNU-hash. The dynamic
  394. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  395. if present into the ELF binaries, otherwise it will use the old SysV
  396. hash style (.hash). This ensures that it is completely backward
  397. compatible.
  398. Further, being the hash table implementation self-contained into each
  399. executable and shared libraries, objects with mixed hash style can
  400. peacefully coexist in the same process.
  401. If you want to use this new feature, answer Y
  402. choice
  403. prompt "Thread support"
  404. default HAS_NO_THREADS
  405. help
  406. If you want to compile uClibc with pthread support, then answer Y.
  407. This will increase the size of uClibc by adding a bunch of locking
  408. to critical data structures, and adding extra code to ensure that
  409. functions are properly reentrant.
  410. config HAS_NO_THREADS
  411. bool "none"
  412. help
  413. Disable thread support.
  414. config UCLIBC_HAS_LINUXTHREADS
  415. bool "Linuxthreads"
  416. # linuxthreads need nanosleep()
  417. select UCLIBC_HAS_REALTIME
  418. depends on !TARGET_aarch64 && \
  419. !TARGET_metag
  420. help
  421. If you want to compile uClibc with Linuxthreads support, then answer Y.
  422. config UCLIBC_HAS_THREADS_NATIVE
  423. bool "Native POSIX Threading (NPTL)"
  424. select UCLIBC_HAS_TLS
  425. select UCLIBC_HAS_STDIO_FUTEXES
  426. select UCLIBC_HAS_REALTIME
  427. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  428. depends on !CONFIG_386 && \
  429. !TARGET_alpha && \
  430. !TARGET_avr32 && \
  431. !TARGET_bfin && \
  432. !TARGET_c6x && \
  433. !TARGET_cris && \
  434. !TARGET_frv && \
  435. !TARGET_h8300 && \
  436. !TARGET_hppa && \
  437. !TARGET_ia64 && \
  438. !TARGET_m68k && \
  439. ARCH_USE_MMU
  440. help
  441. If you want to compile uClibc with NPTL support, then answer Y.
  442. endchoice
  443. config UCLIBC_HAS_THREADS
  444. def_bool y if !HAS_NO_THREADS
  445. config UCLIBC_HAS_TLS
  446. bool "Thread-Local Storage"
  447. depends on UCLIBC_HAS_THREADS_NATIVE
  448. help
  449. If you want to enable TLS support then answer Y.
  450. This is fast an efficient way to store per-thread local data
  451. which is not on stack. It needs __thread support enabled in
  452. gcc.
  453. config PTHREADS_DEBUG_SUPPORT
  454. bool "Build pthreads debugging support"
  455. depends on UCLIBC_HAS_THREADS
  456. help
  457. Say Y here if you wish to be able to debug applications that use
  458. uClibc's pthreads library. By enabling this option, a library
  459. named libthread_db will be built. This library will be dlopen()'d
  460. by gdb and will allow gdb to debug the threads in your application.
  461. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  462. you must compile gdb with uClibc in order for pthread debugging to
  463. work properly.
  464. If you are doing development and want to debug applications using
  465. uClibc's pthread library, answer Y. Otherwise, answer N.
  466. config UCLIBC_HAS_SYSLOG
  467. bool "Syslog support"
  468. default y
  469. depends on UCLIBC_HAS_NETWORK_SUPPORT
  470. select UCLIBC_HAS_SOCKET
  471. help
  472. Support sending messages to the system logger.
  473. This requires socket-support.
  474. config UCLIBC_HAS_LFS
  475. def_bool y
  476. help
  477. Large file support (always enabled; config symbol retained for
  478. feature test to be compatible with uClibc).
  479. choice
  480. prompt "Malloc Implementation"
  481. default MALLOC if ! ARCH_USE_MMU
  482. default MALLOC_STANDARD if ARCH_USE_MMU
  483. config MALLOC
  484. bool "malloc"
  485. help
  486. "malloc" use mmap for all allocations and so works very well on
  487. MMU-less systems that do not support the brk() system call. It is
  488. pretty smart about reusing already allocated memory, and minimizing
  489. memory wastage.
  490. This is the default for uClinux MMU-less systems.
  491. config MALLOC_SIMPLE
  492. bool "malloc-simple"
  493. help
  494. "malloc-simple" is trivially simple and slow as molasses. It
  495. was written from scratch for uClibc, and is the simplest possible
  496. (and therefore smallest) malloc implementation.
  497. This uses only the mmap() system call to allocate and free memory,
  498. and does not use the brk() system call at all, making it a fine
  499. choice for MMU-less systems with very limited memory. It's 100%
  500. standards compliant, thread safe, very small, and releases freed
  501. memory back to the OS immediately rather than keeping it in the
  502. process's heap for reallocation. It is also VERY SLOW.
  503. config MALLOC_STANDARD
  504. bool "malloc-standard"
  505. depends on ARCH_USE_MMU
  506. help
  507. "malloc-standard" is derived from the public domain dlmalloc
  508. implementation by Doug Lea. It is quite fast, and is pretty smart
  509. about reusing already allocated memory, and minimizing memory
  510. wastage. This uses brk() for small allocations, while using mmap()
  511. for larger allocations. This is the default malloc implementation
  512. for uClibc.
  513. If unsure, answer "malloc-standard".
  514. endchoice
  515. config UCLIBC_DYNAMIC_ATEXIT
  516. bool "Dynamic atexit() Support"
  517. default y
  518. help
  519. When this option is enabled, uClibc will support an infinite number,
  520. of atexit() and on_exit() functions, limited only by your available
  521. memory. This can be important when uClibc is used with C++, since
  522. global destructors are implemented via atexit(), and it is quite
  523. possible to exceed the default number when this option is disabled.
  524. Enabling this option adds a few bytes, and more significantly makes
  525. atexit and on_exit depend on malloc, which can be bad when compiling
  526. static executables.
  527. Unless you use uClibc with C++, you should probably answer N.
  528. config COMPAT_ATEXIT
  529. bool "Old (visible) atexit Support"
  530. help
  531. Enable this option if you want to update from 0.9.28 to git/0.9.29,
  532. else you will be missing atexit() until you rebuild all apps.
  533. config UCLIBC_HAS_UTMPX
  534. bool "utmpx based support for tracking login/logouts to/from the system"
  535. help
  536. Answer y to enable support for accessing user accounting database.
  537. It can be used to track all login/logout to the system.
  538. config UCLIBC_HAS_UTMP
  539. bool "utmp support (XPG2 compat, SVr4 compat)"
  540. depends on UCLIBC_HAS_UTMPX
  541. help
  542. Answer y to enable legacy SVID support for accessing
  543. user accounting database:
  544. getutent(), getutid(), getutline(), pututline(),
  545. setutent(), endutent(), utmpname() in utmp.h
  546. It can be used to track all login/logout to the system.
  547. If unsure, answer N and use corresponding POSIX functions
  548. from utmpx.h
  549. config UCLIBC_SUSV2_LEGACY
  550. bool "Enable SuSv2 LEGACY functions"
  551. help
  552. Enable this option if you want to have SuSv2 LEGACY functions
  553. Currently applies to:
  554. valloc
  555. WARNING! ABI incompatibility.
  556. config UCLIBC_SUSV3_LEGACY
  557. bool "Enable SuSv3 LEGACY functions"
  558. #vfork,
  559. # h_errno
  560. # gethostbyaddr
  561. # gethostbyname
  562. help
  563. Enable this option if you want to have SuSv3 LEGACY functions
  564. in the library, else they are replaced by SuSv3 proposed macros.
  565. Currently applies to:
  566. bcmp, bcopy, bzero, index, rindex, ftime,
  567. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  568. (getwd), (makecontext),
  569. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  570. scalb, (setcontext), (swapcontext), ualarm, usleep,
  571. wcswcs.
  572. WARNING! ABI incompatibility.
  573. config UCLIBC_HAS_CONTEXT_FUNCS
  574. bool "Use obsolescent context control functions"
  575. depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
  576. help
  577. Add into library the SuSv3 obsolescent functions used for context
  578. control. The setcontext family allows the implementation in C of
  579. advanced control flow patterns such as iterators, fibers, and
  580. coroutines. They may be viewed as an advanced version of
  581. setjmp/longjmp; whereas the latter allows only a single non-local jump
  582. up the stack, setcontext allows the creation of multiple cooperative
  583. threads of control, each with its own stack.
  584. These functions are: setcontext, getcontext, makecontext, swapcontext.
  585. config UCLIBC_SUSV3_LEGACY_MACROS
  586. bool "Enable SuSv3 LEGACY macros"
  587. help
  588. Enable this option if you want to have SuSv3 LEGACY macros.
  589. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  590. WARNING! ABI incompatibility.
  591. config UCLIBC_SUSV4_LEGACY
  592. bool "Enable SuSv4 LEGACY or obsolescent functions"
  593. help
  594. Enable this option if you want to have SuSv4 LEGACY functions
  595. and macros in the library.
  596. Currently applies to:
  597. - XSI functions:
  598. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  599. gettimeofday, isascii, pthread_getconcurrency,
  600. pthread_setconcurrency, setitimer, setpgrp, sighold,
  601. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  602. tempnam, toascii, ulimit.
  603. - Base functions:
  604. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  605. tmpnam, utime.
  606. WARNING! ABI incompatibility.
  607. config UCLIBC_STRICT_HEADERS
  608. bool "Hide structures and constants for unsupported features"
  609. help
  610. Hide structures and constants in headers that should not be used,
  611. because the respective feature is disabled.
  612. WARNING! enabling this option requires to patch many faulty apps,
  613. since they make (wrongly) use of these structures/constants,
  614. although the feature was disabled.
  615. config UCLIBC_HAS_STUBS
  616. bool "Provide stubs for unavailable functionality"
  617. help
  618. With this option uClibc provides non-functional stubs for
  619. functions which are impossible to implement on the target
  620. architecture. Otherwise, such functions are simply omitted.
  621. config UCLIBC_HAS_SHADOW
  622. bool "Shadow Password Support"
  623. default y
  624. help
  625. Answer N if you do not need shadow password support.
  626. Most people will answer Y.
  627. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  628. bool "Support for program_invocation_name"
  629. help
  630. Support for the GNU-specific program_invocation_name and
  631. program_invocation_short_name strings. Some GNU packages
  632. (like tar and coreutils) utilize these for extra useful
  633. output, but in general are not required.
  634. At startup, these external strings are automatically set
  635. up based on the value of ARGV[0].
  636. If unsure, just answer N.
  637. config UCLIBC_HAS___PROGNAME
  638. bool "Support for __progname"
  639. default y
  640. help
  641. Some packages (like openssh) like to peek into internal libc
  642. symbols to make their output a bit more user friendly.
  643. At startup, __progname is automatically set up based on the
  644. value of ARGV[0].
  645. If unsure, just answer N.
  646. config UCLIBC_HAS_PTY
  647. bool "Support for pseudo-terminals"
  648. default y
  649. help
  650. This enables support for pseudo-terminals (see man 4 pts
  651. and man 7 pty).
  652. If unsure, just answer Y.
  653. config ASSUME_DEVPTS
  654. bool "Assume that /dev/pts is a devpts or devfs file system"
  655. default y
  656. depends on UCLIBC_HAS_PTY
  657. help
  658. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  659. these filesystems automatically manage permissions on the /dev/pts
  660. devices. You may need to mount your devpts or devfs filesystem on
  661. /dev/pts for this to work.
  662. Most people should answer Y.
  663. config UNIX98PTY_ONLY
  664. bool "Support only Unix 98 PTYs"
  665. default y
  666. depends on UCLIBC_HAS_PTY
  667. help
  668. If you want to support only Unix 98 PTYs enable this. Some older
  669. applications may need this disabled and will thus use legacy BSD
  670. style PTY handling which is more complex and also bigger than
  671. Unix 98 PTY handling.
  672. For most current programs, you can generally answer Y.
  673. if UNIX98PTY_ONLY
  674. config UCLIBC_HAS_GETPT
  675. bool "Support getpt() (glibc-compat)"
  676. depends on UCLIBC_HAS_PTY
  677. help
  678. Some packages may need getpt().
  679. All of those are non-standard and can be considered
  680. GNU/libc compatibility.
  681. Either use posix_openpt() or just open /dev/ptmx yourself.
  682. If unsure, just say N.
  683. endif
  684. if !UNIX98PTY_ONLY
  685. # Have to use __libc_ptyname{1,2}[] and related bloat
  686. config UCLIBC_HAS_GETPT
  687. def_bool y
  688. endif
  689. config UCLIBC_HAS_LIBUTIL
  690. bool "Provide libutil library and functions"
  691. depends on UCLIBC_HAS_PTY
  692. help
  693. Provide a libutil library.
  694. This non-standard conforming library provides the following
  695. utility functions:
  696. forkpty(): combines openpty(), fork(2), and login_tty() to
  697. create a new process operating in a pseudo-terminal.
  698. login(): write utmp and wtmp entries
  699. login_tty(): prepares for a login on the tty fd by creating a
  700. new session, making fd the controlling terminal for
  701. the calling process, setting fd to be the standard
  702. input, output, and error streams of the current
  703. process, and closing fd.
  704. logout(): write utmp and wtmp entries
  705. logwtmp(): constructs a utmp structure and calls updwtmp() to
  706. append the structure to the utmp file.
  707. openpty(): finds an available pseudo-terminal and returns
  708. file descriptors for the master and slave
  709. This library adds about 3k-4k to your system.
  710. config UCLIBC_HAS_TM_EXTENSIONS
  711. bool "Support 'struct tm' timezone extension fields"
  712. default y
  713. help
  714. Enabling this option adds fields to 'struct tm' in time.h for
  715. tracking the number of seconds east of UTC, and an abbreviation for
  716. the current timezone. These fields are not specified by the SuSv3
  717. standard, but they are commonly used in both GNU and BSD application
  718. code.
  719. To strictly follow the SuSv3 standard, leave this disabled.
  720. Most people will probably want to answer Y.
  721. config UCLIBC_HAS_TZ_CACHING
  722. bool "Enable caching of the last valid timezone 'TZ' string"
  723. default y
  724. help
  725. Answer Y to enable caching of the last valid 'TZ' string describing
  726. the timezone setting. This allows a quick string compare to avoid
  727. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  728. Most people will answer Y.
  729. config UCLIBC_HAS_TZ_FILE
  730. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  731. default y
  732. help
  733. Answer Y to enable the setting of a default timezone for uClibc.
  734. Ordinarily, uClibc gets the timezone information exclusively from the
  735. 'TZ' environment variable. In particular, there is no support for
  736. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  737. With this option enabled, uClibc will use the value stored in the
  738. file '/etc/TZ' (default path) to obtain timezone information if the
  739. 'TZ' environment variable is missing or has an invalid value. The
  740. file consists of a single line (newline required) of text describing
  741. the timezone in the format specified for the TZ environment variable.
  742. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  743. See
  744. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  745. for details on valid settings of 'TZ'.
  746. Most people will answer Y.
  747. config UCLIBC_HAS_TZ_FILE_READ_MANY
  748. bool "Repeatedly read the '/etc/TZ' file"
  749. depends on UCLIBC_HAS_TZ_FILE
  750. default y
  751. help
  752. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  753. a valid value has been read. This incurs the overhead of an
  754. open/read/close for each tzset() call (explicit or implied). However,
  755. setting this will allow applications to update their timezone
  756. information if the contents of the file change.
  757. Most people will answer Y.
  758. config UCLIBC_TZ_FILE_PATH
  759. string "Path to the 'TZ' file for setting the global timezone"
  760. depends on UCLIBC_HAS_TZ_FILE
  761. default "/etc/TZ"
  762. help
  763. This is the path to the 'TZ' file.
  764. Most people will use the default of '/etc/TZ'.
  765. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  766. bool "Use /etc/localtime as a fallback"
  767. depends on UCLIBC_HAS_TZ_FILE
  768. default y
  769. help
  770. Answer Y to try to use /etc/localtime file.
  771. On glibc systems this file (if it is in TZif2 format)
  772. contains timezone string at the end.
  773. Most people will answer Y.
  774. endmenu
  775. menu "Advanced Library Settings"
  776. config UCLIBC_PWD_BUFFER_SIZE
  777. int "Buffer size for getpwnam() and friends"
  778. default 256
  779. range 12 1024
  780. help
  781. This sets the value of the buffer size for getpwnam() and friends.
  782. By default, this is 256. (For reference, glibc uses 1024).
  783. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  784. parameter.
  785. config UCLIBC_GRP_BUFFER_SIZE
  786. int "Buffer size for getgrnam() and friends"
  787. default 256
  788. range 12 1024
  789. help
  790. This sets the value of the buffer size for getgrnam() and friends.
  791. By default, this is 256. (For reference, glibc uses 1024).
  792. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  793. parameter.
  794. comment "Support various families of functions"
  795. config UCLIBC_LINUX_SPECIFIC
  796. bool "Linux specific functions"
  797. default y
  798. help
  799. accept4(), bdflush(),
  800. capget(), capset(), eventfd(), fallocate(),
  801. fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
  802. madvise(), modify_ldt(), pipe2(), personality(),
  803. prctl()/arch_prctl(), pivot_root(), modify_ldt(),
  804. ppoll(), readahead(), reboot(), remap_file_pages(),
  805. sched_getaffinity(), sched_setaffinity(), sendfile(),
  806. setfsgid(), setfsuid(), setresgid(), setresuid(),
  807. splice(), vmsplice(), tee(), signalfd(), statfs(),
  808. swapoff(), swapon(), sync_file_range(), syncfs(),
  809. _sysctl(), sysinfo(), timerfd_*(), vhangup(), umount(),
  810. umount2()
  811. config UCLIBC_HAS_GNU_ERROR
  812. bool "Support GNU extensions for error-reporting"
  813. default y
  814. help
  815. Support for the GNU-specific error(), error_at_line(),
  816. void (* error_print_progname)(), error_message_count
  817. functions and variables. Some GNU packages
  818. utilize these for extra useful output, but in general
  819. are not required.
  820. If unsure, just answer N.
  821. config UCLIBC_BSD_SPECIFIC
  822. bool "BSD specific functions"
  823. default y
  824. help
  825. mincore(), getdomainname(), setdomainname()
  826. If unsure, say N.
  827. config UCLIBC_HAS_BSD_ERR
  828. bool "BSD err functions"
  829. default y
  830. help
  831. These functions are non-standard BSD extensions.
  832. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  833. If unsure, say N.
  834. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  835. bool "BSD obsolete signal functions"
  836. help
  837. These functions are provided as a compatibility interface for
  838. programs that make use of the historical System V signal API.
  839. This API is obsolete:
  840. new applications should use the POSIX signal API (sigaction(2),
  841. sigprocmask(2), etc.).
  842. Affected functions:
  843. sigset(), sighold(), sigrelse(), sigignore()
  844. If unsure, say N.
  845. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  846. bool "SYSV obsolete signal functions"
  847. help
  848. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  849. If unsure, say N.
  850. config UCLIBC_NTP_LEGACY
  851. bool "ntp_*() aliases"
  852. help
  853. Provide legacy aliases for ntp functions:
  854. ntp_adjtime(), ntp_gettime()
  855. It is safe to say N here.
  856. config UCLIBC_SV4_DEPRECATED
  857. bool "Enable SVr4 deprecated functions"
  858. help
  859. These functions are DEPRECATED in System V release 4.
  860. Say N unless you desparately need one of the functions below:
  861. ustat() [use statfs(2) in your code instead]
  862. config UCLIBC_HAS_REALTIME
  863. bool "Realtime-related family of SUSv functions"
  864. default y
  865. help
  866. These functions are part of the Timers option and need not
  867. be available on all implementations.
  868. Includes AIO, message-queue, scheduler, semaphore functions:
  869. aio.h
  870. mqueue.h
  871. sched.h
  872. semaphore.h
  873. aio_cancel()
  874. aio_error()
  875. aio_fsync()
  876. aio_read()
  877. lio_listio()
  878. aio_return()
  879. aio_suspend()
  880. aio_write()
  881. clock_getres(), clock_gettime(), clock_settime()
  882. fdatasync()
  883. mlockall(), munlockall()
  884. mlock(), munlock()
  885. mq_close()
  886. mq_getattr()
  887. mq_notify()
  888. mq_open()
  889. mq_receive()
  890. mq_send()
  891. mq_setattr()
  892. mq_unlink()
  893. nanosleep()
  894. sched_getparam()
  895. sched_get_priority_max(), sched_get_priority_min()
  896. sched_getscheduler()
  897. sched_rr_get_interval()
  898. sched_setparam()
  899. sched_setscheduler()
  900. sem_close()
  901. sem_destroy()
  902. sem_getvalue()
  903. sem_init()
  904. sem_open()
  905. sem_post()
  906. sem_trywait(), sem_wait()
  907. sem_unlink()
  908. sigqueue()
  909. sigtimedwait(), sigwaitinfo()
  910. timer_create()
  911. timer_delete()
  912. timer_getoverrun(), timer_gettime(), timer_settime()
  913. config UCLIBC_HAS_ADVANCED_REALTIME
  914. bool "Advanced realtime-related family of SUSv functions"
  915. default y
  916. depends on UCLIBC_HAS_REALTIME
  917. help
  918. These functions are part of the Timers option and need not
  919. be available on all implementations.
  920. clock_getcpuclockid()
  921. clock_nanosleep()
  922. mq_timedreceive()
  923. mq_timedsend()
  924. posix_fadvise()
  925. posix_fallocate()
  926. posix_madvise()
  927. posix_memalign()
  928. posix_mem_offset()
  929. posix_spawnattr_destroy(), posix_spawnattr_init()
  930. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  931. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  932. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  933. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  934. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  935. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  936. posix_spawn_file_actions_addclose()
  937. posix_spawn_file_actions_adddup2()
  938. posix_spawn_file_actions_addopen()
  939. posix_spawn_file_actions_destroy()
  940. posix_spawn_file_actions_init()
  941. posix_spawn()
  942. posix_spawnp()
  943. posix_typed_mem_get_info()
  944. pthread_mutex_timedlock()
  945. sem_timedwait()
  946. #config UCLIBC_HAS_TERMIOS
  947. # bool "termios functions"
  948. # default y
  949. # help
  950. # Get and set terminal attributes, line control, get and set baud
  951. # rate.
  952. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  953. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  954. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  955. #
  956. # If unsure, say Y.
  957. config UCLIBC_HAS_EPOLL
  958. bool "epoll"
  959. default y
  960. help
  961. epoll_create(), epoll_ctl(), epoll_wait() functions.
  962. config UCLIBC_HAS_XATTR
  963. bool "Extended Attributes"
  964. default y
  965. help
  966. Extended Attributes support.
  967. setxattr()
  968. lsetxattr()
  969. fsetxattr()
  970. getxattr()
  971. lgetxattr()
  972. fgetxattr()
  973. listxattr()
  974. llistxattr()
  975. flistxattr()
  976. removexattr()
  977. lremovexattr()
  978. fremovexattr()
  979. Say N unless you need support for extended attributes and the
  980. filesystems do actually support them.
  981. config UCLIBC_HAS_PROFILING
  982. bool "Profiling support"
  983. default y
  984. help
  985. gcc's -finstrument-functions needs these.
  986. Most people can safely answer N.
  987. config UCLIBC_HAS_CRYPT_IMPL
  988. bool "libcrypt support"
  989. default y
  990. help
  991. libcrypt contains crypt(), setkey() and encrypt()
  992. config UCLIBC_HAS_SHA256_CRYPT_IMPL
  993. bool "libcrypt SHA256 support"
  994. depends on UCLIBC_HAS_CRYPT_IMPL
  995. help
  996. This adds support for SHA256 password hashing via the crypt() function.
  997. Say N here if you do not need SHA256 crypt support.
  998. config UCLIBC_HAS_SHA512_CRYPT_IMPL
  999. bool "libcrypt SHA512 support"
  1000. depends on UCLIBC_HAS_CRYPT_IMPL
  1001. help
  1002. This adds support for SHA512 password hashing via the crypt() function.
  1003. Say N here if you do not need SHA512 crypt support.
  1004. config UCLIBC_HAS_CRYPT_STUB
  1005. bool "libcrypt stubs"
  1006. default y
  1007. depends on !UCLIBC_HAS_CRYPT_IMPL
  1008. help
  1009. Standards mandate that crypt(3) provides a stub if it is unavailable.
  1010. If you enable this option then stubs for
  1011. crypt(), setkey() and encrypt()
  1012. will be provided in a small libcrypt.
  1013. config UCLIBC_HAS_CRYPT
  1014. def_bool y
  1015. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  1016. endmenu
  1017. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  1018. bool "Networking Support"
  1019. default y
  1020. help
  1021. Say N here if you do not need network support.
  1022. if UCLIBC_HAS_NETWORK_SUPPORT
  1023. config UCLIBC_HAS_SOCKET
  1024. bool "Socket support"
  1025. default y
  1026. help
  1027. If you want to include support for sockets then answer Y.
  1028. config UCLIBC_HAS_IPV4
  1029. bool "IP version 4 support"
  1030. default y
  1031. select UCLIBC_HAS_SOCKET
  1032. help
  1033. If you want to include support for the Internet Protocol
  1034. (IP version 4) then answer Y.
  1035. Most people will say Y.
  1036. config UCLIBC_HAS_IPV6
  1037. bool "IP version 6 support"
  1038. select UCLIBC_HAS_SOCKET
  1039. help
  1040. If you want to include support for the next version of the Internet
  1041. Protocol (IP version 6) then answer Y.
  1042. Most people should answer N.
  1043. config UCLIBC_USE_NETLINK
  1044. bool "Use netlink to query interfaces"
  1045. depends on UCLIBC_HAS_SOCKET
  1046. help
  1047. In newer versions of Linux (2.4.17+), support was added for querying
  1048. network device information via netlink rather than the old style
  1049. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1050. it is smaller than netlink), but if you find that not all of your
  1051. devices are being returned by the if_nameindex() function, you will
  1052. have to use the netlink implementation.
  1053. Most people can safely answer N.
  1054. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1055. bool "Support the AI_ADDRCONFIG flag"
  1056. depends on UCLIBC_USE_NETLINK
  1057. help
  1058. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1059. implementation using netlink to query interfaces to find both
  1060. ipv4 and ipv6 support. This is only needed if an application uses
  1061. the AI_ADDRCONFIG flag.
  1062. Most people can safely answer N.
  1063. config UCLIBC_HAS_BSD_RES_CLOSE
  1064. bool "Support res_close() (bsd-compat)"
  1065. help
  1066. Answer Y if you desperately want to support BSD compatibility in
  1067. the network code.
  1068. Most people will say N.
  1069. config UCLIBC_HAS_COMPAT_RES_STATE
  1070. bool "Use compatible but bloated _res"
  1071. default y
  1072. help
  1073. Answer Y if you build network utilities and they muck with resolver
  1074. internals a lot (_res global structure). uclibc does not use most
  1075. of _res.XXX fields, and with this option OFF they won't even exist.
  1076. Which will make e.g. dig build fail.
  1077. Answering N saves around 400 bytes in bss.
  1078. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1079. bool "Use extra compatible but extra bloated _res"
  1080. help
  1081. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1082. As far as I can say, this should never be needed.
  1083. config UCLIBC_HAS_RESOLVER_SUPPORT
  1084. bool "DNS resolver functions"
  1085. select UCLIBC_HAS_COMPAT_RES_STATE
  1086. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1087. help
  1088. Provide implementations for DNS resolver functions.
  1089. In particular, the following functions will be added to the
  1090. library:
  1091. ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
  1092. res_mkquery, res_init, res_ninit, res_close, res_nclose
  1093. res_query, res_search, res_querydomain,
  1094. dn_expand, dn_comp,
  1095. ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
  1096. ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
  1097. ns_get16, ns_get32, ns_put16, ns_put32
  1098. endif
  1099. menu "String and Stdio Support"
  1100. config UCLIBC_HAS_STRING_GENERIC_OPT
  1101. bool "Use faster (but larger) generic string functions"
  1102. default y
  1103. help
  1104. Answer Y to use the (tweaked) glibc generic string functions.
  1105. In general, they are faster (but 3-5K larger) than the base
  1106. uClibc string functions which are optimized solely for size.
  1107. Many people will answer Y.
  1108. config UCLIBC_HAS_STRING_ARCH_OPT
  1109. bool "Use arch-specific assembly string functions (where available)"
  1110. default y
  1111. help
  1112. Answer Y to use any archtecture-specific assembly language string
  1113. functions available for this target plaform.
  1114. Note that assembly implementations are not available for all string
  1115. functions, so some generic (written in C) string functions may
  1116. still be used.
  1117. These are small and fast, the only reason _not_ to say Y here is
  1118. for debugging purposes.
  1119. config UCLIBC_HAS_STDIO_FUTEXES
  1120. bool "Use futexes for multithreaded I/O locking"
  1121. depends on UCLIBC_HAS_THREADS_NATIVE
  1122. help
  1123. If you want to compile uClibc to use futexes for low-level
  1124. I/O locking, answer Y. Otherwise, answer N.
  1125. config UCLIBC_HAS_CTYPE_TABLES
  1126. bool "Use Table Versions Of 'ctype.h' Functions."
  1127. default y
  1128. help
  1129. Answer Y to use table versions of the 'ctype.h' functions.
  1130. While the non-table versions are often smaller when building
  1131. statically linked apps, they work only in stub locale mode.
  1132. Most people will answer Y.
  1133. config UCLIBC_HAS_CTYPE_SIGNED
  1134. bool "Support Signed Characters In 'ctype.h' Functions."
  1135. depends on UCLIBC_HAS_CTYPE_TABLES
  1136. default y
  1137. help
  1138. Answer Y to enable support for passing signed char values to
  1139. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1140. these functions are only defined for unsigned char values and
  1141. EOF. However, glibc allows negative signed char values as well
  1142. in order to support 'broken old programs'.
  1143. Most people will answer Y.
  1144. choice
  1145. prompt "ctype argument checking"
  1146. depends on UCLIBC_HAS_CTYPE_TABLES
  1147. default UCLIBC_HAS_CTYPE_UNSAFE
  1148. help
  1149. Please select the invalid arg behavior you want for the 'ctype'
  1150. functions.
  1151. The 'ctype' functions are now implemented using table lookups, with
  1152. the arg being the index. This can result in incorrect memory accesses
  1153. or even segfaults for args outside of the allowed range.
  1154. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1155. the macro implementations.
  1156. config UCLIBC_HAS_CTYPE_UNSAFE
  1157. bool "Do not check -- unsafe"
  1158. config UCLIBC_HAS_CTYPE_CHECKED
  1159. bool "Detect and handle appropriately"
  1160. config UCLIBC_HAS_CTYPE_ENFORCED
  1161. bool "Issue a diagnostic and abort()"
  1162. endchoice
  1163. config UCLIBC_HAS_WCHAR
  1164. bool "Wide Character Support"
  1165. help
  1166. Answer Y to enable wide character support. This will make uClibc
  1167. much larger. It is also currently required for locale support.
  1168. Most people will answer N.
  1169. config UCLIBC_HAS_LIBICONV
  1170. bool "Iconv Support"
  1171. select UCLIBC_HAS_WCHAR
  1172. help
  1173. Add tiny iconv support for charset conversion from and to UTF-8.
  1174. config UCLIBC_HAS_LIBINTL
  1175. bool "Intl stubs support"
  1176. help
  1177. If you enable this option you get stubs for the gettext family of
  1178. functions.
  1179. config UCLIBC_HAS_LOCALE
  1180. bool "Locale Support"
  1181. select UCLIBC_HAS_WCHAR
  1182. select UCLIBC_HAS_CTYPE_TABLES
  1183. select UCLIBC_HAS_LIBICONV
  1184. help
  1185. uClibc now has full ANSI/ISO C99 locale support (except for
  1186. wcsftime() and collating items in regex). Be aware that enabling
  1187. this option will make uClibc much larger.
  1188. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1189. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1190. uClibc by around 300k. You can reduce this size by building your own
  1191. custom set of locate data (see extra/locale/LOCALES for details).
  1192. uClibc's locale support is still under development. For example,
  1193. codesets using shift states are not currently supported. Support is
  1194. planned in the next iteration of locale support.
  1195. Answer Y to enable locale support. Most people will answer N.
  1196. choice
  1197. prompt "Locale data"
  1198. depends on UCLIBC_HAS_LOCALE
  1199. default UCLIBC_BUILD_MINIMAL_LOCALE
  1200. config UCLIBC_BUILD_MINIMAL_LOCALE
  1201. bool "Only selected locales"
  1202. depends on UCLIBC_HAS_LOCALE
  1203. help
  1204. If you do not need all locales that are available on your
  1205. host-box, then set this to 'Y'.
  1206. config UCLIBC_BUILD_ALL_LOCALE
  1207. bool "All locales"
  1208. depends on UCLIBC_HAS_LOCALE
  1209. help
  1210. This builds all the locales that are available on your
  1211. host-box.
  1212. endchoice
  1213. config UCLIBC_BUILD_MINIMAL_LOCALES
  1214. string "locales to use"
  1215. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1216. default "en_US"
  1217. help
  1218. Space separated list of locales to use.
  1219. E.g.:
  1220. en_US en_GB de_AT
  1221. default:
  1222. en_US
  1223. config UCLIBC_HAS_XLOCALE
  1224. bool "Extended Locale Support (experimental/incomplete)"
  1225. depends on UCLIBC_HAS_LOCALE
  1226. help
  1227. Answer Y to enable extended locale support similar to that provided
  1228. by glibc. This is primarily intended to support libstd++
  1229. functionality.
  1230. However, it also allows thread-specific locale selection via
  1231. uselocale().
  1232. Most people will answer N.
  1233. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1234. bool "Support hexadecimal float notation"
  1235. depends on UCLIBC_HAS_CTYPE_TABLES
  1236. depends on UCLIBC_HAS_FLOATS
  1237. help
  1238. Answer Y to enable support for hexadecimal float notation in the
  1239. (wchar and) char string to floating point conversion functions, as
  1240. well as support for the %a and %A conversion specifiers in the
  1241. *printf() and *scanf() functions.
  1242. Most people will answer N.
  1243. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1244. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1245. depends on UCLIBC_HAS_LOCALE
  1246. depends on UCLIBC_HAS_FLOATS
  1247. help
  1248. Answer Y to enable support for glibc's \"'\" flag for allowing
  1249. locale-specific digit grouping in base 10 integer conversions and
  1250. appropriate floating point conversions in the *printf() and *scanf()
  1251. functions.
  1252. Most people will answer N.
  1253. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1254. bool "Do not require digit grouping when the \"'\" flag is specified"
  1255. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1256. default y
  1257. help
  1258. Answer Y to make digit grouping optional when the \"'\" flag is
  1259. specified.
  1260. This is the standard glibc behavior. If the initial string of digits
  1261. exceeds the maximum group number, the input will be treated as a
  1262. normal non-grouped number.
  1263. Most people will answer N.
  1264. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1265. bool "Support glibc's register_printf_function() (glibc-compat)"
  1266. depends on !USE_OLD_VFPRINTF
  1267. help
  1268. Answer Y to support glibc's register_printf_function() to allow an
  1269. application to add its own printf conversion specifiers.
  1270. parse_printf_format() is also enabled.
  1271. NOTE: Limits the number or registered specifiers to 10.
  1272. NOTE: Requires new conversion specifiers to be ASCII
  1273. characters (0-0x7f). This is to avoid problems with processing
  1274. format strings in locales with different multibyte conversions.
  1275. Most people will answer N.
  1276. config USE_OLD_VFPRINTF
  1277. bool "Use the old vfprintf implementation"
  1278. depends on !UCLIBC_HAS_WCHAR
  1279. help
  1280. Set to true to use the old vfprintf instead of the new. This is
  1281. roughly C89 compliant with some extensions, and is much smaller.
  1282. However, it does not support wide chars, positional args, or glibc
  1283. custom printf specifiers.
  1284. Most people will answer N.
  1285. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1286. int "Maximum number of positional args. Either 0 or >= 9."
  1287. depends on !USE_OLD_VFPRINTF
  1288. default 9
  1289. help
  1290. Set the maximum number of positional args supported by the
  1291. printf/scanf functions. The Single Unix Specification Version 3
  1292. requires a minimum value of 9. Setting this to a value lower than
  1293. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1294. in limits.h to be #undef'd.
  1295. WARNING! The workspace to support positional args is currently
  1296. allocated on the stack. You probably don't want to set
  1297. this to too high a value.
  1298. Most people will answer 9.
  1299. choice
  1300. prompt "Stdio buffer size"
  1301. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1302. help
  1303. Please select a value for BUFSIZ. This will be used by the
  1304. stdio subsystem as the default buffer size for a file, and
  1305. affects fopen(), setvbuf(), etc.
  1306. NOTE: Setting this to 'none' will disable buffering completely.
  1307. However, BUFSIZ will still be defined in stdio.h as 256 because
  1308. many applications use this value.
  1309. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1310. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1311. depends on !UCLIBC_HAS_WCHAR
  1312. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1313. bool "256 (minimum ANSI/ISO C99 value)"
  1314. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1315. bool "512"
  1316. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1317. bool "1024"
  1318. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1319. bool "2048"
  1320. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1321. bool "4096"
  1322. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1323. bool "8192"
  1324. # If you add more choices, you will need to update uClibc_stdio.h.
  1325. endchoice
  1326. choice
  1327. prompt "Stdio builtin buffer size (uClibc-specific)"
  1328. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1329. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1330. help
  1331. When a FILE is created with fopen(), an attempt is made to allocate
  1332. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1333. succeed but the FILE will be unbuffered.
  1334. This option adds a small amount of space to each FILE to act as an
  1335. emergency buffer in the event of a buffer allocation failure.
  1336. Most people will answer None.
  1337. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1338. bool "None"
  1339. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1340. bool "4"
  1341. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1342. bool "8"
  1343. # If you add more choices, you will need to update uClibc_stdio.h.
  1344. endchoice
  1345. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1346. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1347. help
  1348. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1349. a behavioral change made in SUSv3. Previously, abort() was required
  1350. to have the affect of fclose() on all open streams. The wording has
  1351. been changed to "may" from "shall".
  1352. Most people will answer N.
  1353. config UCLIBC_HAS_STDIO_GETC_MACRO
  1354. bool "Provide a macro version of getc()"
  1355. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1356. default y
  1357. help
  1358. Provide a macro version of getc().
  1359. Most people will answer Y.
  1360. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1361. bool "Provide a macro version of putc()"
  1362. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1363. default y
  1364. help
  1365. Provide a macro version of putc().
  1366. Most people will answer Y.
  1367. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1368. bool "Support auto-r/w transition"
  1369. default y
  1370. help
  1371. Answer Y to enable the stdio subsystem to automaticly transition
  1372. between reading and writing. This relaxes the ANSI/ISO C99
  1373. requirement:
  1374. When a file is opened with update mode ('+' as the second or third
  1375. character in the list of mode argument values), both input and output
  1376. may be performed on the associated stream. However, output shall not
  1377. be directly followed by input without an intervening call to the
  1378. fflush function or to a file positioning function (fseek, fsetpos,
  1379. or rewind), and input shall not be directly followed by output without
  1380. an intervening call to a file positioning function, unless the input
  1381. operation encounters end­of­file.
  1382. Most people will answer Y.
  1383. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1384. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1385. help
  1386. Answer Y to enable a uClibc-specific extension to allow passing an
  1387. additional 'F' flag in the mode string for fopen() to specify that
  1388. the file should be open()ed with the O_LARGEFILE flag set.
  1389. Most people will answer N.
  1390. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1391. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1392. help
  1393. Answer Y to support a glibc extension to allow passing
  1394. additional 'x' flag in the mode string for fopen() to specify that
  1395. the file should be open()ed with the O_EXCL flag set.
  1396. Most people will answer N.
  1397. config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
  1398. bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
  1399. help
  1400. Answer Y to support a glibc extension to allow passing
  1401. additional 'e' flag in the mode string for fopen() to specify that
  1402. the file should be open()ed with the O_CLOEXEC flag set.
  1403. Most people will answer N.
  1404. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1405. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1406. help
  1407. Answer Y to support the glibc 'custom stream' extension functions
  1408. fmemopen(), open_memstream(), and fopencookie().
  1409. NOTE: There are some minor differences regarding seeking behavior.
  1410. Most people will answer N.
  1411. config UCLIBC_HAS_PRINTF_M_SPEC
  1412. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1413. help
  1414. Answer Y to support a glibc extension to interpret '%m' in printf
  1415. format strings as an instruction to output the error message string
  1416. (as generated by strerror) corresponding to the current value of
  1417. 'errno'.
  1418. Most people will answer N.
  1419. config UCLIBC_HAS_ERRNO_MESSAGES
  1420. bool "Include the errno message text in the library"
  1421. default y
  1422. help
  1423. Answer Y if you want to include the errno message text in the
  1424. library. This adds about 3K to the library, but enables strerror()
  1425. to generate text other than 'Unknown error <number>'.
  1426. Most people will answer Y.
  1427. config UCLIBC_HAS_SYS_ERRLIST
  1428. bool "Support sys_errlist[] (obsolete-compat)"
  1429. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1430. help
  1431. Answer Y if you want to support the obsolete sys_errlist[].
  1432. This adds about 0.5k to the library, except for the mips
  1433. arch where it adds over 4K.
  1434. WARNING! In the future, support for sys_errlist[] may be unavailable
  1435. in at least some configurations. In fact, it may be removed
  1436. altogether.
  1437. Most people will answer N.
  1438. Application writers: use the strerror(3) function.
  1439. config UCLIBC_HAS_SIGNUM_MESSAGES
  1440. bool "Include the signum message text in the library"
  1441. default y
  1442. help
  1443. Answer Y if you want to include the signum message text in the
  1444. library. This adds about 0.5K to the library, but enables strsignal()
  1445. to generate text other than 'Unknown signal <number>'.
  1446. Most people will answer Y.
  1447. config UCLIBC_HAS_SYS_SIGLIST
  1448. bool "Support sys_siglist[] (bsd-compat)"
  1449. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1450. help
  1451. Answer Y if you want to support sys_siglist[].
  1452. WARNING! In the future, support for sys_siglist[] may be unavailable
  1453. in at least some configurations. In fact, it may be removed
  1454. altogether.
  1455. Most people will answer N.
  1456. config UCLIBC_HAS_GNU_GETOPT
  1457. bool "Support gnu getopt"
  1458. default y
  1459. help
  1460. Answer Y if you want to include full gnu getopt() instead of a
  1461. (much smaller) SUSv3 compatible getopt().
  1462. Note that getopt_long, getopt_long_only as well as getsubopt
  1463. are implemented on top of this choice.
  1464. Most people will answer Y.
  1465. config UCLIBC_HAS_GETOPT_LONG
  1466. bool "Support getopt_long/getopt_long_only (glibc-compat)"
  1467. default y
  1468. help
  1469. Answer Y if you want to include getopt_long[_only()] used by many
  1470. apps.
  1471. Most people will answer Y.
  1472. config UCLIBC_HAS_GNU_GETSUBOPT
  1473. bool "Support getsubopt"
  1474. default y
  1475. help
  1476. Answer Y if you want to include getsubopt().
  1477. Most people will answer Y.
  1478. config UCLIBC_HAS_ARGP
  1479. bool "Support argp"
  1480. select UCLIBC_HAS_GETOPT_LONG
  1481. select UCLIBC_HAS_GNU_GETOPT
  1482. select UCLIBC_HAS_WCHAR
  1483. default n
  1484. help
  1485. Argp is an interface for parsing unix-style argument vectors. Unlike
  1486. the common getopt interface, it provides many advanced features in
  1487. addition to parsing options, such as automatic output in response to
  1488. `--help' and `--version' options.
  1489. A library can export an argp option parser, which programs can easily
  1490. use in conjunction with their own option parser.
  1491. Argp support is needed by elfutils libdw.
  1492. Most people can safely answer N.
  1493. endmenu
  1494. menu "Big and Tall"
  1495. config UCLIBC_HAS_REGEX
  1496. bool "Regular Expression Support"
  1497. default y
  1498. help
  1499. POSIX regular expression code is really big -- 53k all by itself.
  1500. If you don't use regular expressions, turn this off and save space.
  1501. Of course, if you only statically link, leave this on, since it will
  1502. only be included in your apps if you use regular expressions.
  1503. config UCLIBC_HAS_FNMATCH
  1504. bool "fnmatch Support"
  1505. default y
  1506. help
  1507. POSIX fnmatch.
  1508. config UCLIBC_HAS_WORDEXP
  1509. bool "Support the wordexp() interface"
  1510. depends on UCLIBC_HAS_GLOB
  1511. help
  1512. The SuSv3 wordexp() interface performs word expansions per the Shell
  1513. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1514. intended for use by applications that want to implement all of the
  1515. standard Bourne shell expansions on input data.
  1516. This interface is rarely used, and very large. Unless you have a
  1517. pressing need for wordexp(), you should probably answer N.
  1518. config UCLIBC_HAS_NFTW
  1519. bool "Support the nftw() interface"
  1520. help
  1521. The SuSv3 nftw() interface is used to recursively descend
  1522. directory paths while repeatedly calling a function.
  1523. This interface is rarely used, and adds around 4.5k. Unless you have
  1524. a pressing need for nftw(), you should probably answer N.
  1525. config UCLIBC_HAS_FTW
  1526. bool "Support the ftw() interface (SUSv4-obsolete)"
  1527. depends on UCLIBC_SUSV4_LEGACY
  1528. help
  1529. The SuSv3 ftw() interface is used to recursively descend
  1530. directory paths while repeatedly calling a function.
  1531. This interface is rarely used, and adds around 4.5k. Unless you have
  1532. a pressing need for ftw(), you should probably answer N.
  1533. config UCLIBC_HAS_FTS
  1534. bool "Support the fts() interface (bsd-compat)"
  1535. help
  1536. The fts functions are provided for traversing UNIX file hierarchies.
  1537. This interface is currently used by the elfutils and adds
  1538. around 7.5k.
  1539. You should port your application to use the POSIX nftw()
  1540. interface.
  1541. Unless you need to build/use elfutils, you should prolly answer N.
  1542. config UCLIBC_HAS_GLOB
  1543. bool "Support the glob() interface"
  1544. depends on UCLIBC_HAS_FNMATCH
  1545. default y
  1546. help
  1547. The glob interface is somewhat large (weighing in at about 2,5k). It
  1548. is used fairly often, but is an option since people wanting to go for
  1549. absolute minimum size may wish to omit it.
  1550. Most people will answer Y.
  1551. config UCLIBC_HAS_GNU_GLOB
  1552. bool "Support gnu glob() interface"
  1553. depends on UCLIBC_HAS_GLOB
  1554. help
  1555. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1556. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1557. from glibc and does not support all the GNU specific options.
  1558. Answer Y if you want to include full gnu glob() instead of the smaller
  1559. SUSv3 compatible glob().
  1560. Most people will answer N.
  1561. endmenu
  1562. menu "Library Installation Options"
  1563. config RUNTIME_PREFIX
  1564. string "uClibc runtime library directory"
  1565. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1566. help
  1567. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1568. libraries will be installed. The result will look something
  1569. like the following:
  1570. $(RUNTIME_PREFIX)/
  1571. lib/ <contains all runtime libraries>
  1572. usr/bin/ldd <the ldd utility program>
  1573. sbin/ldconfig <the ldconfig utility program>
  1574. This value is used by the 'make install' Makefile target. Since this
  1575. directory is compiled into the shared library loader, you will need to
  1576. recompile uClibc if you change this value...
  1577. For a typical target system this should be set to "/", such that
  1578. 'make install' will install /lib/libuClibc-<VERSION>.so
  1579. config DEVEL_PREFIX
  1580. string "uClibc development environment directory"
  1581. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1582. help
  1583. DEVEL_PREFIX is the directory into which the uClibc development
  1584. environment will be installed. The result will look something
  1585. like the following:
  1586. $(DEVEL_PREFIX)/
  1587. lib/ <contains static libs>
  1588. include/ <Where all the header files go>
  1589. This value is used by the 'make install' Makefile target when
  1590. installing a uClibc development environment.
  1591. For a typical target system this should be set to "/usr", such that
  1592. 'make install' will install /usr/include/<header files>.
  1593. config MULTILIB_DIR
  1594. string "library path component"
  1595. default "lib"
  1596. help
  1597. Path component where libraries reside.
  1598. For a typical target system this should be set to "lib", such that
  1599. 'make install' will install libraries to "/lib" and "/usr/lib"
  1600. respectively
  1601. DEVEL_PREFIX/MULTILIB_DIR
  1602. RUNTIME_PREFIX/MULTILIB_DIR
  1603. Other settings may include "lib32" or "lib64".
  1604. config HARDWIRED_ABSPATH
  1605. bool "Hardwire absolute paths into linker scripts"
  1606. default y
  1607. help
  1608. This prepends absolute paths to the libraries mentioned in linker
  1609. scripts such as libc.so.
  1610. This is a build time optimization. It has no impact on dynamic
  1611. linking at runtime, which doesn't use linker scripts.
  1612. You must disable this to use uClibc with old non-sysroot toolchains,
  1613. such as the prebuilt binary cross compilers at:
  1614. http://uclibc.org/downloads/binaries
  1615. The amount of time saved by this optimization is actually too small to
  1616. measure. The linker just had to search the library path to find the
  1617. linker script, so the dentries are cache hot if it has to search the
  1618. same path again. But it's what glibc does, so we do it too.
  1619. endmenu
  1620. menu "Security options"
  1621. config UCLIBC_BUILD_PIE
  1622. bool "Build utilities as ET_DYN/PIE executables"
  1623. depends on HAVE_SHARED
  1624. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_nds32
  1625. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1626. help
  1627. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1628. executables.
  1629. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1630. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1631. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1632. all libraries have to be built with -fPIC or -fpic, and all
  1633. assembler functions must be written as position independent
  1634. code (PIC).
  1635. config UCLIBC_HAS_ARC4RANDOM
  1636. bool "Include the arc4random() function"
  1637. help
  1638. Answer Y to support the OpenBSD-like arc4random() function. This
  1639. function picks a random number between 0 and N, and will always return
  1640. something even if the random driver is dead. If urandom fails then
  1641. gettimeofday(2) will be used as the random seed. This function is
  1642. designed to be more dependable than invoking /dev/urandom directly.
  1643. OpenSSL and OpenNTPD currently support this function.
  1644. Most people will answer N.
  1645. config ARC4RANDOM_USES_NODEV
  1646. bool "Do not use /dev/urandom with arc4random()"
  1647. depends on UCLIBC_HAS_ARC4RANDOM
  1648. help
  1649. Answer Y to use gettimeofday(2) and getpid(2) exclusively for
  1650. arc4random(). This is not a bad idea for a diskless system, but
  1651. it uses a lot of syscalls to stir each array element.
  1652. Most people will answer N.
  1653. config HAVE_NO_SSP
  1654. bool
  1655. config UCLIBC_HAS_SSP
  1656. bool "Support for GCC stack smashing protector"
  1657. depends on !HAVE_NO_SSP
  1658. help
  1659. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1660. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1661. the needed functions are added to ldso/libc instead.
  1662. GCC's stack protector is a reimplementation of IBM's propolice.
  1663. See http://www.trl.ibm.com/projects/security/ssp/ and
  1664. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1665. for details.
  1666. Note that NOEXECSTACK on a kernel with address space randomization
  1667. is generally sufficient to prevent most buffer overflow exploits
  1668. without increasing code size. This option essentially adds debugging
  1669. code to catch them.
  1670. Most people will answer N.
  1671. config SSP_QUICK_CANARY
  1672. bool "Use simple guard values without accessing /dev/urandom"
  1673. depends on UCLIBC_HAS_SSP
  1674. help
  1675. Use gettimeofday(2) to define the __guard without accessing
  1676. /dev/urandom.
  1677. WARNING: This makes smashing stack protector vulnerable to timing
  1678. attacks.
  1679. Most people will answer N.
  1680. choice
  1681. prompt "Propolice protection blocking signal"
  1682. depends on UCLIBC_HAS_SSP
  1683. depends on DODEBUG
  1684. default PROPOLICE_BLOCK_SEGV
  1685. help
  1686. "abort" use SIGABRT to block offending programs.
  1687. This is the default implementation.
  1688. "segfault" use SIGSEGV to block offending programs.
  1689. Use this for debugging.
  1690. If unsure, answer "abort".
  1691. config PROPOLICE_BLOCK_ABRT
  1692. bool "abort"
  1693. config PROPOLICE_BLOCK_SEGV
  1694. bool "segfault"
  1695. endchoice
  1696. config UCLIBC_BUILD_SSP
  1697. bool "Build uClibc with -fstack-protector"
  1698. depends on UCLIBC_HAS_SSP
  1699. help
  1700. Build all uClibc libraries and executables with -fstack-protector,
  1701. adding extra stack overflow checking to most uClibc functions.
  1702. config UCLIBC_BUILD_RELRO
  1703. bool "Build uClibc with linker option -z RELRO"
  1704. depends on HAVE_SHARED
  1705. default y
  1706. help
  1707. Build all libraries and executables with "ld -z relro".
  1708. This tells the linker to mark chunks of an executable or shared
  1709. library read-only after applying dynamic relocations. (This comes
  1710. up when a global const variable is initialized to the address of a
  1711. function or the value of another global variable.)
  1712. This is a fairly obscure option the ld man page doesn't even bother
  1713. to document properly. It's a security paranoia issue that's more
  1714. likely to consume memory (by allocating an extra page) rather than
  1715. save it.
  1716. This is explained in more depth at
  1717. http://www.airs.com/blog/archives/189
  1718. Nobody is likely to care whether you say Y or N here.
  1719. config UCLIBC_BUILD_NOW
  1720. bool "Build uClibc with linker option -z NOW"
  1721. depends on HAVE_SHARED
  1722. help
  1723. Build all libraries and executables with "ld -z now".
  1724. This tells the linker to resolve all symbols when the library is
  1725. first loaded, rather than when each function is first called. This
  1726. increases start-up latency by a few microseconds and may do
  1727. unnecessary work (resolving symbols that are never used), but the
  1728. realtime people like it for making microbenchmark timings slightly
  1729. more predictable and in some cases it can be slightly faster due to
  1730. CPU cache behavior (not having to fault the linker back in to do
  1731. lazy symbol resolution).
  1732. Most people can't tell the difference between selecting Y or N here.
  1733. config UCLIBC_BUILD_NOEXECSTACK
  1734. bool "Build uClibc with noexecstack marking"
  1735. default y
  1736. help
  1737. Mark all assembler files as noexecstack, which will mark uClibc
  1738. as not requiring an executable stack. (This doesn't prevent other
  1739. files you link against from claiming to need an executable stack, it
  1740. just won't cause uClibc to request it unnecessarily.)
  1741. This is a security thing to make buffer overflows harder to exploit.
  1742. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1743. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1744. It only actually provides any security when combined with address
  1745. space randomization, explained here: http://lwn.net/Articles/121845/
  1746. Address space randomization is on by default in current linux
  1747. kernels (although it can be disabled using the option
  1748. CONFIG_COMPAT_BRK).
  1749. You should probably say Y.
  1750. endmenu
  1751. menu "Development/debugging options"
  1752. config CROSS_COMPILER_PREFIX
  1753. string "Cross-compiling toolchain prefix"
  1754. default ""
  1755. help
  1756. The prefix used to execute your cross-compiling toolchain. For
  1757. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1758. then enter 'arm-linux-uclibc-' here.
  1759. config UCLIBC_EXTRA_CFLAGS
  1760. string "Extra CFLAGS"
  1761. default ""
  1762. help
  1763. Add any additional CFLAGS to be used to build uClibc.
  1764. config DODEBUG
  1765. bool "Enable debugging symbols"
  1766. select EXTRA_WARNINGS
  1767. help
  1768. Say Y here if you wish to compile uClibc with debugging symbols.
  1769. This will allow you to use a debugger to examine uClibc internals
  1770. while applications are running. This increases the size of the
  1771. library considerably and should only be used when doing development.
  1772. If you are doing development and want to debug uClibc, answer Y.
  1773. Otherwise, answer N.
  1774. config DODEBUG_PT
  1775. bool "Build pthread with debugging output"
  1776. depends on UCLIBC_HAS_THREADS && UCLIBC_HAS_LINUXTHREADS
  1777. help
  1778. Enable debug output in libpthread. This is only useful when doing
  1779. development in libpthread itself.
  1780. Otherwise, answer N.
  1781. config DOSTRIP
  1782. bool "Strip libraries and executables"
  1783. default y
  1784. depends on !DODEBUG
  1785. help
  1786. Say Y here if you do wish to strip all uClibc libraries and
  1787. executables. No stripping increases the size of the binaries
  1788. considerably, but makes it possible to debug uClibc libraries.
  1789. Most people will answer Y.
  1790. config DOASSERTS
  1791. bool "Build with run-time assertion testing"
  1792. help
  1793. Say Y here to include runtime assertion tests.
  1794. This enables runtime assertion testing in some code, which can
  1795. increase the size of the library and incur runtime overhead.
  1796. If you say N, then this testing will be disabled.
  1797. config SUPPORT_LD_DEBUG
  1798. bool "Build the shared library loader with debugging support"
  1799. depends on HAVE_SHARED
  1800. help
  1801. Answer Y here to enable all the extra code needed to debug the uClibc
  1802. native shared library loader. The level of debugging noise that is
  1803. generated depends on the LD_DEBUG environment variable... Just set
  1804. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1805. debug your application. Diagnostic messages will then be printed to
  1806. the stderr.
  1807. For now these debugging tokens are available:
  1808. detail provide more information for some options
  1809. move display copy processing
  1810. symbols display symbol table processing
  1811. reloc display relocation processing; detail shows the
  1812. relocation patch
  1813. nofixups never fixes up jump relocations
  1814. bindings displays the resolve processing (function calls);
  1815. detail shows the relocation patch
  1816. all Enable everything!
  1817. The additional environment variable:
  1818. LD_DEBUG_OUTPUT=file
  1819. redirects the diagnostics to an output file created using
  1820. the specified name and the process id as a suffix.
  1821. An excellent start is simply:
  1822. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1823. or to log everything to a file named 'logfile', try this
  1824. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1825. If you are doing development and want to debug uClibc's shared library
  1826. loader, answer Y. Mere mortals answer N.
  1827. config SUPPORT_LD_DEBUG_EARLY
  1828. bool "Build the shared library loader with early debugging support"
  1829. depends on HAVE_SHARED
  1830. help
  1831. Answer Y here to if you find the uClibc shared library loader is
  1832. crashing or otherwise not working very early on. This is typical
  1833. only when starting a new port when you haven't figured out how to
  1834. properly get the values for argc, argv, environ, etc. This method
  1835. allows a degree of visibility into the very early shared library
  1836. loader initialization process. If you are doing development and want
  1837. to debug the uClibc shared library loader early initialization,
  1838. answer Y. Mere mortals answer N.
  1839. config UCLIBC_MALLOC_DEBUGGING
  1840. bool "Build malloc with debugging support"
  1841. depends on MALLOC || MALLOC_STANDARD
  1842. select DOASSERTS
  1843. help
  1844. Answer Y here to compile extra debugging support code into malloc.
  1845. Malloc debugging output may then be enabled at runtime using the
  1846. MALLOC_DEBUG environment variable.
  1847. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1848. as a bitmask with the following bits:
  1849. 1 - do extra consistency checking
  1850. 2 - output messages for malloc/free calls and OS
  1851. allocation calls
  1852. 4 - output messages for the `MMB' layer
  1853. 8 - output messages for internal malloc heap manipulation
  1854. calls
  1855. Because this increases the size of malloc appreciably (due to strings
  1856. etc), you should say N unless you need to debug a malloc problem.
  1857. config UCLIBC_HAS_BACKTRACE
  1858. bool "Add support for application self-debugging"
  1859. depends on HAVE_SHARED
  1860. help
  1861. Answer Y here to compile support for application self-debugging that
  1862. provides the following new functions:
  1863. backtrace, backtrace_symbols, backtrace_symbols_fd
  1864. The backtrace functionality is currently supported on some platforms, and it
  1865. based on dwarf2 informations to properly work, so any application that
  1866. want to use backtrace needs to be built with -fexceptions flag.
  1867. The symbol names may be unavailable without the use of special linker
  1868. options. For systems using the GNU linker, it is necessary to use the
  1869. -rdynamic linker option too. Note that names of "static" functions are not
  1870. exposed, and won't be available in the backtrace.
  1871. config WARNINGS
  1872. string "Compiler Warnings"
  1873. default "-Wall"
  1874. help
  1875. Set this to the set of compiler warnings you wish to see while compiling.
  1876. config EXTRA_WARNINGS
  1877. bool "Enable extra annoying warnings"
  1878. help
  1879. If you wish to build with extra warnings enabled, say Y here.
  1880. endmenu