Config.in 43 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 C Library Configuration"
  6. choice
  7. prompt "Target Architecture"
  8. default TARGET_i386
  9. help
  10. Stuff
  11. config TARGET_alpha
  12. bool "alpha"
  13. config TARGET_arm
  14. bool "arm"
  15. config TARGET_bfin
  16. bool "bfin (BROKEN)"
  17. config TARGET_cris
  18. bool "cris (BROKEN)"
  19. config TARGET_e1
  20. bool "e1 (BROKEN)"
  21. config TARGET_frv
  22. bool "frv (BROKEN)"
  23. config TARGET_h8300
  24. bool "h8300 (BROKEN)"
  25. config TARGET_hppa
  26. bool "hppa"
  27. config TARGET_i386
  28. bool "i386"
  29. config TARGET_i960
  30. bool "i960 (BROKEN)"
  31. config TARGET_m68k
  32. bool "m68k"
  33. config TARGET_microblaze
  34. bool "microblaze (BROKEN)"
  35. config TARGET_mips
  36. bool "mips"
  37. config TARGET_nios
  38. bool "nios (BROKEN)"
  39. config TARGET_nios2
  40. bool "nios2 (BROKEN)"
  41. config TARGET_powerpc
  42. bool "powerpc"
  43. config TARGET_sh
  44. bool "superh"
  45. config TARGET_sh64
  46. bool "sh64"
  47. config TARGET_sparc
  48. bool "sparc"
  49. config TARGET_v850
  50. bool "v850 (BROKEN)"
  51. config TARGET_x86_64
  52. bool "x86_64"
  53. endchoice
  54. menu "Target Architecture Features and Options"
  55. if TARGET_alpha
  56. source "extra/Configs/Config.alpha"
  57. endif
  58. if TARGET_arm
  59. source "extra/Configs/Config.arm"
  60. endif
  61. if TARGET_bfin
  62. source "extra/Configs/Config.bfin"
  63. endif
  64. if TARGET_cris
  65. source "extra/Configs/Config.cris"
  66. endif
  67. if TARGET_e1
  68. source "extra/Configs/Config.e1"
  69. endif
  70. if TARGET_frv
  71. source "extra/Configs/Config.frv"
  72. endif
  73. if TARGET_h8300
  74. source "extra/Configs/Config.h8300"
  75. endif
  76. if TARGET_hppa
  77. source "extra/Configs/Config.hppa"
  78. endif
  79. if TARGET_i386
  80. source "extra/Configs/Config.i386"
  81. endif
  82. if TARGET_i960
  83. source "extra/Configs/Config.i960"
  84. endif
  85. if TARGET_m68k
  86. source "extra/Configs/Config.m68k"
  87. endif
  88. if TARGET_nios
  89. source "extra/Configs/Config.nios"
  90. endif
  91. if TARGET_nios2
  92. source "extra/Configs/Config.nios2"
  93. endif
  94. if TARGET_microblaze
  95. source "extra/Configs/Config.microblaze"
  96. endif
  97. if TARGET_mips
  98. source "extra/Configs/Config.mips"
  99. endif
  100. if TARGET_powerpc
  101. source "extra/Configs/Config.powerpc"
  102. endif
  103. if TARGET_sh
  104. source "extra/Configs/Config.sh"
  105. endif
  106. if TARGET_sh64
  107. source "extra/Configs/Config.sh64"
  108. endif
  109. if TARGET_sparc
  110. source "extra/Configs/Config.sparc"
  111. endif
  112. if TARGET_v850
  113. source "extra/Configs/Config.v850"
  114. endif
  115. if TARGET_x86_64
  116. source "extra/Configs/Config.x86_64"
  117. endif
  118. source "extra/Configs/Config.in.arch"
  119. endmenu
  120. menu "General Library Settings"
  121. config HAVE_NO_PIC
  122. bool
  123. default n
  124. config DOPIC
  125. bool "Generate only Position Independent Code (PIC)"
  126. default y
  127. depends !HAVE_NO_PIC
  128. help
  129. If you wish to build all of uClibc as PIC objects, then answer Y here.
  130. If you are unsure, then you should answer N.
  131. config HAVE_NO_SHARED
  132. bool
  133. default n
  134. config ARCH_HAS_NO_LDSO
  135. bool
  136. select HAVE_NO_SHARED
  137. default n
  138. config HAVE_SHARED
  139. bool "Enable support for shared libraries"
  140. depends on !HAVE_NO_SHARED
  141. default y
  142. help
  143. If you wish to build uClibc with support for shared libraries then
  144. answer Y here. If you only want to build uClibc as a static library,
  145. then answer N.
  146. config FORCE_SHAREABLE_TEXT_SEGMENTS
  147. bool "Only load shared libraries which can share their text segment"
  148. depends on HAVE_SHARED
  149. select DOPIC
  150. default n
  151. help
  152. If you answer Y here, the uClibc native shared library loader will
  153. only load shared libraries, which do not need to modify any non-writable
  154. segments. These libraries haven't set the DT_TEXTREL tag in the dynamic
  155. section (==> objdump). All your libraries must be compiled with
  156. -fPIC or -fpic, and all assembler function must be written as position
  157. independent code (PIC).
  158. Enabling this option will make uClibc's shared library loader a
  159. little bit smaller and guarantee that no memory will be wasted by badly
  160. coded shared libraries.
  161. config LDSO_LDD_SUPPORT
  162. bool "Native shared library loader 'ldd' support"
  163. depends on HAVE_SHARED
  164. default y
  165. help
  166. Enable this to enable all the code needed to support traditional ldd,
  167. which executes the shared library loader to resolve all dependencies
  168. and then provide a list of shared libraries that are required for an
  169. application to function. Disabling this option will makes uClibc's
  170. shared library loader a little bit smaller. Most people will answer Y.
  171. config LDSO_CACHE_SUPPORT
  172. bool "Enable shared library loader cache"
  173. depends on HAVE_SHARED
  174. default y
  175. help
  176. Enable this to make use of /etc/ld.so.conf, the shared library loader
  177. cache configuration file to support for non-standard library paths.
  178. After updating this file, it is necessary to run 'ldconfig' to update
  179. the /etc/ld.so.cache shared library loader cache file.
  180. config LDSO_PRELOAD_FILE_SUPPORT
  181. bool "Enable shared library loader preload file support"
  182. depends on HAVE_SHARED
  183. default n
  184. help
  185. Enable this to make use of /etc/ld.so.preload. This file contains a
  186. whitespace separated list of shared libraries to be loaded before
  187. the program.
  188. config LDSO_BASE_FILENAME
  189. string "Shared library loader naming prefix"
  190. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  191. default "ld.so"
  192. help
  193. If you wish to support both uClibc and glibc on the same system, it
  194. is necessary to set this to something other than "ld.so" to avoid
  195. conflicts with glibc, which also uses "ld.so". This prevents both
  196. libraries from using the same /etc/ld.so.* files. If you wish to
  197. support both uClibc and glibc on the same system then you should set
  198. this to "ld-uClibc.so".
  199. Most people will leave this set to the default of "ld.so".
  200. WARNING: Changing the default prefix could cause problems with
  201. binutils' ld !
  202. config LDSO_RUNPATH
  203. bool "Enable ELF RUNPATH tag support"
  204. depends on HAVE_SHARED
  205. default y
  206. help
  207. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  208. which extend the library search paths. They are really only useful
  209. if a package installs libraries in non standard locations and
  210. ld.so.conf support is disabled.
  211. Usage of RUNPATH tags is not too common, so disabling this feature
  212. should be safe for most people.
  213. config UCLIBC_CTOR_DTOR
  214. bool "Support global constructors and destructors"
  215. default y
  216. help
  217. If you wish to build uClibc with support for global constructor
  218. (ctor) and global destructor (dtor) support, then answer Y here.
  219. When ctor/dtor support is enabled, binaries linked with uClibc must
  220. also be linked with crtbegin.o and crtend.o which are provided by gcc
  221. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  222. may need to be adjusted to include these files). This support will
  223. also add a small amount of additional size to each binary compiled vs
  224. uClibc. If you will be using uClibc with C++, or if you need the gcc
  225. __attribute__((constructor)) and __attribute__((destructor)) to work,
  226. then you definitely want to answer Y here. If you don't need ctors
  227. or dtors and want your binaries to be as small as possible, then
  228. answer N.
  229. config HAS_NO_THREADS
  230. bool
  231. default n
  232. config UCLIBC_HAS_THREADS
  233. bool "POSIX Threading Support"
  234. depends on !HAS_NO_THREADS
  235. default y
  236. help
  237. If you want to compile uClibc with pthread support, then answer Y.
  238. This will increase the size of uClibc by adding a bunch of locking
  239. to critical data structures, and adding extra code to ensure that
  240. functions are properly reentrant.
  241. If your applications require pthreads, answer Y.
  242. config PTHREADS_DEBUG_SUPPORT
  243. bool "Build pthreads debugging support"
  244. default n
  245. depends on UCLIBC_HAS_THREADS
  246. help
  247. Say Y here if you wish to be able to debug applications that use
  248. uClibc's pthreads library. By enabling this option, a library
  249. named libthread_db will be built. This library will be dlopen()'d
  250. by gdb and will allow gdb to debug the threads in your application.
  251. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  252. you must compile gdb with uClibc in order for pthread debugging to
  253. work properly.
  254. If you are doing development and want to debug applications using
  255. uClibc's pthread library, answer Y. Otherwise, answer N.
  256. config LINUXTHREADS_OLD
  257. bool "Use the older (stable) version of linuxthreads"
  258. default y
  259. depends on UCLIBC_HAS_THREADS
  260. help
  261. There are two versions of linuxthreads. The older (stable) version
  262. has been in uClibc for quite a long time but hasn't seen too many
  263. updates other than bugfixes.
  264. The new version has not been tested much, and lacks ports for arches
  265. which glibc does not support (like bfin/frv/etc...), but is based on
  266. the latest code from glibc, so it may be the only choice for the
  267. newer ports (like alpha/amd64/64bit arches and hppa).
  268. config UCLIBC_HAS_LFS
  269. bool "Large File Support"
  270. default y
  271. help
  272. If you wish to build uClibc with support for accessing large files
  273. (i.e. files greater then 2 GiB) then answer Y. Do not enable this
  274. if you are using an older Linux kernel (2.0.x) that lacks large file
  275. support. Enabling this option will increase the size of uClibc.
  276. config UCLIBC_STATIC_LDCONFIG
  277. bool "Link ldconfig statically"
  278. default y
  279. help
  280. Enable this option to statically link the ldconfig binary.
  281. Making ldconfig static can be beneficial if you have a library
  282. problem and need to use ldconfig to recover. Sometimes, it is
  283. preferable to instead keep the size of the system down, in which
  284. case you should disable this option.
  285. choice
  286. prompt "Malloc Implementation"
  287. default MALLOC if ! ARCH_HAS_MMU
  288. default MALLOC_STANDARD if ARCH_HAS_MMU
  289. help
  290. "malloc" use mmap for all allocations and so works very well on MMU-less
  291. systems that do not support the brk() system call. It is pretty smart
  292. about reusing already allocated memory, and minimizing memory wastage.
  293. This is the default for uClinux MMU-less systems.
  294. "malloc-simple" was written from scratch for uClibc, and is the
  295. simplest possible (and therefore smallest) malloc implementation.
  296. This uses only the mmap() system call to allocation memory, and does
  297. not use the brk() system call at all, making it a fine choice for
  298. MMU-less systems with very limited memory. It is rather dumb, and
  299. certainly isn't the fastest. But it is 100% standards compliant,
  300. thread safe, and very small.
  301. "malloc-standard" is derived from the public domain dlmalloc
  302. implementation by Doug Lea. It is quite fast, and is pretty smart
  303. about reusing already allocated memory, and minimizing memory
  304. wastage. This uses brk() for small allocations, while using mmap()
  305. for larger allocations. This is the default malloc implementation
  306. for uClibc.
  307. If unsure, answer "malloc-standard".
  308. config MALLOC
  309. bool "malloc"
  310. config MALLOC_SIMPLE
  311. bool "malloc-simple"
  312. config MALLOC_STANDARD
  313. bool "malloc-standard"
  314. depends on ARCH_HAS_MMU
  315. endchoice
  316. config MALLOC_GLIBC_COMPAT
  317. bool "Malloc returns live pointer for malloc(0)"
  318. default n
  319. help
  320. The behavior of malloc(0) is listed as implementation-defined by
  321. SuSv3. Glibc returns a valid pointer to something, while uClibc
  322. normally return a NULL. I personally feel glibc's behavior is
  323. not particularly safe, and allows buggy applications to hide very
  324. serious problems.
  325. When this option is enabled, uClibc will act just like glibc, and
  326. return a live pointer when someone calls malloc(0). This pointer
  327. provides a malloc'ed area with a size of 1 byte. This feature is
  328. mostly useful when dealing with applications using autoconf's broken
  329. AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
  330. does not detect glibc style returning-a-valid-pointer-for-malloc(0)
  331. behavior). Most people can safely answer N.
  332. config UCLIBC_DYNAMIC_ATEXIT
  333. bool "Dynamic atexit() Support"
  334. default y
  335. help
  336. When this option is enabled, uClibc will support an infinite number,
  337. of atexit() and on_exit() functions, limited only by your available
  338. memory. This can be important when uClibc is used with C++, since
  339. global destructors are implemented via atexit(), and it is quite
  340. possible to exceed the default number when this option is disabled.
  341. Enabling this option adds a few bytes, and more significantly makes
  342. atexit and on_exit depend on malloc, which can be bad when compiling
  343. static executables.
  344. Unless you use uClibc with C++, you should probably answer N.
  345. config COMPAT_ATEXIT
  346. bool "Old (visible) atexit Support"
  347. default n
  348. help
  349. Enable this option if you want to update from 0.9.28 to svn/0.9.29, else
  350. you will be missing atexit() until you rebuild all apps.
  351. config HAS_SHADOW
  352. bool "Shadow Password Support"
  353. default y
  354. help
  355. Answer N if you do not need shadow password support.
  356. Most people will answer Y.
  357. config UNIX98PTY_ONLY
  358. bool "Support only Unix 98 PTYs"
  359. default y
  360. help
  361. If you want to support only Unix 98 PTYs enable this. Some older
  362. applications may need this disabled. For most current programs,
  363. you can generally answer Y.
  364. config ASSUME_DEVPTS
  365. bool "Assume that /dev/pts is a devpts or devfs file system"
  366. default y
  367. help
  368. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  369. these filesystems automatically manage permissions on the /dev/pts
  370. devices. You may need to mount your devpts or devfs filesystem on
  371. /dev/pts for this to work.
  372. Most people should answer Y.
  373. config UCLIBC_HAS_TM_EXTENSIONS
  374. bool "Support 'struct tm' timezone extension fields"
  375. default y
  376. help
  377. Enabling this option adds fields to 'struct tm' in time.h for
  378. tracking the number of seconds east of UTC, and an abbreviation for
  379. the current timezone. These fields are not specified by the SuSv3
  380. standard, but they are commonly used in both GNU and BSD application
  381. code.
  382. To strictly follow the SuSv3 standard, leave this disabled.
  383. Most people will probably want to answer Y.
  384. config UCLIBC_HAS_TZ_CACHING
  385. bool "Enable caching of the last valid timezone 'TZ' string"
  386. default y
  387. help
  388. Answer Y to enable caching of the last valid 'TZ' string describing
  389. the timezone setting. This allows a quick string compare to avoid
  390. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  391. Most people will answer Y.
  392. config UCLIBC_HAS_TZ_FILE
  393. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  394. default y
  395. help
  396. Answer Y to enable the setting of a default timezone for uClibc.
  397. Ordinarily, uClibc gets the timezone information exclusively from the
  398. 'TZ' environment variable. In particular, there is no support for
  399. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  400. With this option enabled, uClibc will use the value stored in the
  401. file '/etc/TZ' (default path) to obtain timezone information if the
  402. 'TZ' environment variable is missing or has an invalid value. The
  403. file consists of a single line (newline required) of text describing
  404. the timezone in the format specified for the TZ environment variable.
  405. Simply doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  406. See
  407. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  408. for details on valid settings of 'TZ'.
  409. Most people will answer Y.
  410. config UCLIBC_HAS_TZ_FILE_READ_MANY
  411. bool "Repeatedly read the '/etc/TZ' file"
  412. depends on UCLIBC_HAS_TZ_FILE
  413. default y
  414. help
  415. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  416. a valid value has been read. This incurs the overhead of an open/read/close
  417. for each tzset() call (explicit or implied). However, setting this
  418. will allows applications to update their timezone information if the contents
  419. of the file change.
  420. Most people will answer Y.
  421. config UCLIBC_TZ_FILE_PATH
  422. string "Path to the 'TZ' file for setting the global timezone"
  423. depends on UCLIBC_HAS_TZ_FILE
  424. default "/etc/TZ"
  425. help
  426. This is the path to the 'TZ' file.
  427. Most people will use the default of '/etc/TZ'.
  428. endmenu
  429. menu "Networking Support"
  430. config UCLIBC_HAS_IPV6
  431. bool "IP version 6 Support"
  432. default n
  433. help
  434. If you want to include support for the next version of the Internet
  435. Protocol (IP version 6) then answer Y.
  436. Most people should answer N.
  437. config UCLIBC_HAS_RPC
  438. bool "Remote Procedure Call (RPC) support"
  439. default n
  440. help
  441. If you want to include RPC support, enable this. RPC is rarely used
  442. for anything except for the NFS filesystem. Unless you plan to use NFS,
  443. you can probably leave this set to N and save some space. If you need
  444. to use NFS then you should answer Y.
  445. config UCLIBC_HAS_FULL_RPC
  446. bool "Full RPC support"
  447. depends on UCLIBC_HAS_RPC
  448. default y if !HAVE_SHARED
  449. help
  450. Normally we enable just enough RPC support for things like rshd and
  451. nfs mounts to work. If you find you need the rest of the RPC stuff,
  452. then enable this option. Most people can safely answer N.
  453. config UCLIBC_HAS_REENTRANT_RPC
  454. bool "Reentrant RPC support"
  455. depends on UCLIBC_HAS_RPC
  456. default y if !HAVE_SHARED
  457. help
  458. Most packages utilize the normal (non-reentrant) RPC functions, but
  459. some (like exportfs from nfs-utils) need these reentrant versions.
  460. Most people can safely answer N.
  461. endmenu
  462. menu "String and Stdio Support"
  463. config UCLIBC_HAS_STRING_GENERIC_OPT
  464. bool "Use glibc generic string functions"
  465. default y
  466. help
  467. Answer Y to use the (tweaked) glibc generic string functions.
  468. In general, they are faster (but 3-5K larger) than the base
  469. uClibc string functions which are optimized solely for size.
  470. Many people will answer Y.
  471. config UCLIBC_HAS_STRING_ARCH_OPT
  472. bool "Use arch-specific string functions"
  473. default y
  474. help
  475. Answer Y to use the arch-specific string functions instead of the
  476. base uClibc versions, which are optimized exclusively for size.
  477. Most people will answer Y, as this has been default behavior
  478. for some time.
  479. config UCLIBC_HAS_CTYPE_TABLES
  480. bool "Use Table Versions Of 'ctype.h' Functions."
  481. default y
  482. help
  483. Answer Y to use table versions of the 'ctype.h' functions.
  484. While the non-table versions are often smaller when building
  485. staticly linked apps, they work only in stub locale mode.
  486. Most people will answer Y.
  487. config UCLIBC_HAS_CTYPE_SIGNED
  488. bool "Support Signed Characters In 'ctype.h' Functions."
  489. depends UCLIBC_HAS_CTYPE_TABLES
  490. default y
  491. help
  492. Answer Y to enable support for passing signed char values to
  493. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  494. these functions are only defined for unsigned char values and
  495. EOF. However, glibc allows negative signed char values as well
  496. in order to support 'broken old programs'.
  497. Most people will answer Y.
  498. choice
  499. prompt "ctype argument checking"
  500. depends UCLIBC_HAS_CTYPE_TABLES
  501. default UCLIBC_HAS_CTYPE_UNSAFE
  502. help
  503. Please select the invalid arg behavior you want for the 'ctype' functions.
  504. The 'ctype' functions are now implemented using table lookups, with
  505. the arg being the index. This can result in incorrect memory accesses
  506. or even segfaults for args outside of the allowed range.
  507. NOTE: This only affects the 'ctype' _functions_. It does not affect
  508. the macro implementations.
  509. config UCLIBC_HAS_CTYPE_UNSAFE
  510. bool "Do not check -- unsafe"
  511. config UCLIBC_HAS_CTYPE_CHECKED
  512. bool "Detect and handle appropriately"
  513. config UCLIBC_HAS_CTYPE_ENFORCED
  514. bool "Issue a diagnostic and abort()"
  515. endchoice
  516. config UCLIBC_HAS_WCHAR
  517. bool "Wide Character Support"
  518. default n
  519. help
  520. Answer Y to enable wide character support. This will make uClibc
  521. much larger. It is also currently required for locale support.
  522. Most people will answer N.
  523. config UCLIBC_HAS_LOCALE
  524. bool "Locale Support"
  525. select UCLIBC_HAS_WCHAR
  526. select UCLIBC_HAS_CTYPE_TABLES
  527. default n
  528. help
  529. uClibc now has full ANSI/ISO C99 locale support (except for
  530. wcsftime() and collating items in regex). Be aware that enabling
  531. this option will make uClibc much larger.
  532. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  533. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  534. uClibc by around 300k. You can reduce this size by building your own
  535. custom set of locate data (see extra/locale/LOCALES for details).
  536. uClibc's locale support is still under development. For example,
  537. codesets using shift states are not currently supported. Support is
  538. planned in the next iteration of locale support.
  539. Answer Y to enable locale support. Most people will answer N.
  540. config UCLIBC_PREGENERATED_LOCALE_DATA
  541. bool "Use Pre-generated Locale Data"
  542. depends on UCLIBC_HAS_LOCALE
  543. default n
  544. help
  545. If you are selective and only want locale data for a few particular
  546. locales, or you enjoy pain, or you are a rabid do-it-yourself sort of
  547. person, you can turn this option off and manually walk through the
  548. mostly undocumented procedure needed to generate your own locale
  549. data.
  550. Mere mortals will answer Y and use the default set of pregenerated
  551. locale data, which supports 169 UTF-8 locales, and 144 locales for
  552. other codesets (for the complete list see extra/locale/LOCALES).
  553. config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
  554. bool "Automagically Download the Pre-generated Locale Data (if necessary)"
  555. depends on UCLIBC_PREGENERATED_LOCALE_DATA
  556. default n
  557. help
  558. If you would like the build process to use 'wget' to automatically
  559. download the pregenerated locale data, enable this option. Otherwise
  560. you will need to obtain the locale data yourself from:
  561. http://www.uclibc.org/downloads/uClibc-locale-030818.tgz
  562. and place the uClibc-locale-030818.tgz tarball in the extra/locale/
  563. directory.
  564. Go ahead and make life easy for yourself... Answer Y.
  565. config UCLIBC_HAS_XLOCALE
  566. bool "Extended Locale Support (experimental/incomplete)"
  567. depends on UCLIBC_HAS_LOCALE
  568. default n
  569. help
  570. Answer Y to enable extended locale support similar to that provided
  571. by glibc. This is primarily intended to support libstd++ functionality.
  572. However, it also allows thread-specific locale selection via uselocale().
  573. Most people will answer N.
  574. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  575. bool "Support hexadecimal float notation"
  576. depends UCLIBC_HAS_CTYPE_TABLES
  577. depends on UCLIBC_HAS_FLOATS
  578. default n
  579. help
  580. Answer Y to enable support for hexadecimal float notation in the
  581. (wchar and) char string to floating point conversion functions, as
  582. well as support for the %a and %A conversion specifiers in the
  583. *printf() and *scanf() functions.
  584. Most people will answer N.
  585. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  586. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  587. depends on UCLIBC_HAS_LOCALE
  588. depends on UCLIBC_HAS_FLOATS
  589. default n
  590. help
  591. Answer Y to enable support for glibc's \"'\" flag for allowing locale-specific
  592. digit grouping in base 10 integer conversions and appropriate floating point
  593. conversions in the *printf() and *scanf() functions.
  594. Most people will answer N.
  595. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  596. bool "Do not require digit grouping when the \"'\" flag is specified"
  597. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  598. default y
  599. help
  600. Answer Y to make digit grouping optional when the \"'\" flag is specified.
  601. This is the standard glibc behavior. If the initial string of digits
  602. exceeds the maximum group number, the input will be treated as a normal
  603. non-grouped number.
  604. Most people will answer N.
  605. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  606. bool "Support glibc's register_printf_function() (glibc-compat)"
  607. depends on !USE_OLD_VFPRINTF
  608. default n
  609. help
  610. Answer Y to support glibc's register_printf_function() to allow an
  611. application to add its own printf conversion specifiers.
  612. NOTE: This implementation limits the number or registered specifiers to 10.
  613. NOTE: This implementation requires new conversion specifiers to be ASCII
  614. characters (0-0x7f). This is to avoid problems with processing
  615. format strings in locales with different multibyte conversions.
  616. Most people will answer N.
  617. config USE_OLD_VFPRINTF
  618. bool "Use the old vfprintf implementation"
  619. depends on !UCLIBC_HAS_WCHAR
  620. default n
  621. help
  622. Set to true to use the old vfprintf instead of the new. This is roughly
  623. C89 compliant with some extensions, and is much smaller. However, it does
  624. not support wide chars, positional args, or glibc custom printf specifiers.
  625. Most people will answer N.
  626. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  627. int "Maximum number of positional args. Either 0 or >= 9."
  628. depends on !USE_OLD_VFPRINTF
  629. default 9
  630. help
  631. Set the maximum number of positional args supported by the printf/scanf
  632. functions. The Single Unix Specification Version 3 requires a minimum
  633. value of 9. Setting this to a value lower than 9 will disable positional
  634. arg support and cause the NL_ARGMAX macro in limits.h to be #undef'd.
  635. WARNING! The workspace to support positional args is currently allocated
  636. on the stack. You probably don't want to set this to too high a value.
  637. Most people will answer 9.
  638. config UCLIBC_HAS_SCANF_GLIBC_A_FLAG
  639. bool "Support glibc's 'a' flag for scanf string conversions (not implemented)"
  640. default n
  641. help
  642. NOTE!!! Currently Not Implemented!!! Just A Place Holder!! NOTE!!!
  643. NOTE!!! Conflicts with an ANSI/ISO C99 scanf flag!! NOTE!!!
  644. Answer Y to enable support for glibc's 'a' flag for the scanf string
  645. conversions '%s', '%[', '%ls', '%l[', and '%S'. This is used to
  646. auto-allocate sufficient memory to hold the data retrieved.
  647. Most people will answer N.
  648. choice
  649. prompt "Stdio buffer size"
  650. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  651. help
  652. Please select a value for BUFSIZ. This will be used by the
  653. stdio subsystem as the default buffer size for a file, and
  654. affects fopen(), setvbuf(), etc.
  655. NOTE: Setting this to 'none' will disable buffering completely.
  656. However, BUFSIZ will still be defined in stdio.h as 256 because
  657. many applications use this value.
  658. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  659. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  660. depends !UCLIBC_HAS_WCHAR
  661. config UCLIBC_HAS_STDIO_BUFSIZ_256
  662. bool "256 (minimum ANSI/ISO C99 value)"
  663. config UCLIBC_HAS_STDIO_BUFSIZ_512
  664. bool "512"
  665. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  666. bool "1024"
  667. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  668. bool "2048"
  669. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  670. bool "4096"
  671. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  672. bool "8192"
  673. # If you add more choices, you will need to update uClibc_stdio.h.
  674. endchoice
  675. choice
  676. prompt "Stdio builtin buffer size (uClibc-specific)"
  677. depends !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  678. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  679. help
  680. When a FILE is created with fopen(), an attempt is made to allocate
  681. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  682. succeed but the FILE will be unbuffered.
  683. This option adds a small amount of space to each FILE to act as an
  684. emergency buffer in the event of a buffer allocation failure.
  685. Most people will answer None.
  686. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  687. bool "None"
  688. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  689. bool "4"
  690. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  691. bool "8"
  692. # If you add more choices, you will need to update uClibc_stdio.h.
  693. endchoice
  694. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  695. bool "Attemt to shutdown stdio subsystem when abort() is called."
  696. default n
  697. help
  698. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was a behavioral
  699. change made in SUSv3. Previously, abort() was required to have the affect of
  700. fclose() on all open streams. The wording has been changed to "may" from "shall".
  701. Most people will answer N.
  702. config UCLIBC_HAS_STDIO_GETC_MACRO
  703. bool "Provide a macro version of getc()"
  704. depends !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  705. default y
  706. help
  707. Provide a macro version of getc().
  708. Most people will answer Y.
  709. config UCLIBC_HAS_STDIO_PUTC_MACRO
  710. bool "Provide a macro version of putc()"
  711. depends !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  712. default y
  713. help
  714. Provide a macro version of putc().
  715. Most people will answer Y.
  716. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  717. bool "Support auto-r/w transition"
  718. default y
  719. help
  720. Answer Y to enable the stdio subsystem to automaticly transition
  721. between reading and writing. This relaxes the ANSI/ISO C99 requirement:
  722. When a file is opened with update mode ('+' as the second or third character
  723. in the list of mode argument values), both input and output may be performed
  724. on the associated stream. However, output shall not be directly followed by
  725. input without an intervening call to the fflush function or to a file
  726. positioning function (fseek, fsetpos, or rewind), and input shall not be
  727. directly followed by output without an intervening call to a file positioning
  728. function, unless the input operation encounters end­of­file.
  729. Most people will answer Y.
  730. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  731. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  732. depends on UCLIBC_HAS_LFS
  733. default n
  734. help
  735. Answer Y to enable a uClibc-specific extension to allow passing an
  736. additional 'F' flag in the mode string for fopen() to specify that
  737. the file should be open()ed with the O_LARGEFILE flag set.
  738. Most people will answer N.
  739. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  740. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  741. default n
  742. help
  743. Answer Y to support a glibc extension to allow passing
  744. additional 'x' flag in the mode string for fopen() to specify that
  745. the file should be open()ed with the O_EXCL flag set.
  746. Most people will answer N.
  747. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  748. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  749. default n
  750. help
  751. Answer Y to support the glibc 'custom stream' extension functions
  752. fmemopen(), open_memstream(), and fopencookie().
  753. NOTE: There are some minor differences regarding seeking behavior.
  754. Most people will answer N.
  755. config UCLIBC_HAS_PRINTF_M_SPEC
  756. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  757. default n
  758. help
  759. Answer Y to support a glibc extension to interpret '%m' in printf
  760. format strings as an instruction to output the error message string
  761. (as generated by strerror) corresponding to the current value of 'errno'.
  762. Most people will answer N.
  763. config UCLIBC_HAS_ERRNO_MESSAGES
  764. bool "Include the errno message text in the library"
  765. default y
  766. help
  767. Answer Y if you want to include the errno message text in the
  768. library. This adds about 3K to the library, but enables strerror()
  769. to generate text other than 'Unknown error <number>'.
  770. Most people will answer Y.
  771. config UCLIBC_HAS_SYS_ERRLIST
  772. bool "Support sys_errlist[] (obsolete-compat)"
  773. depends on UCLIBC_HAS_ERRNO_MESSAGES
  774. default n
  775. help
  776. Answer Y if you want to support the obsolete sys_errlist[].
  777. This adds about 0.5k to the library, except for the mips
  778. arch where it adds over 4K.
  779. WARNING! In the future, support for sys_errlist[] may be unavailable
  780. in at least some configurations. In fact, it may be removed altogether.
  781. Most people will answer N.
  782. config UCLIBC_HAS_SIGNUM_MESSAGES
  783. bool "Include the signum message text in the library"
  784. default y
  785. help
  786. Answer Y if you want to include the signum message text in the
  787. library. This adds about 0.5K to the library, but enables strsignal()
  788. to generate text other than 'Unknown signal <number>'.
  789. Most people will answer Y.
  790. config UCLIBC_HAS_SYS_SIGLIST
  791. bool "Support sys_siglist[] (bsd-compat)"
  792. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  793. default n
  794. help
  795. Answer Y if you want to support sys_siglist[].
  796. WARNING! In the future, support for sys_siglist[] may be unavailable
  797. in at least some configurations. In fact, it may be removed altogether.
  798. Most people will answer N.
  799. config UCLIBC_HAS_GETTEXT_AWARENESS
  800. bool "Include gettext awareness"
  801. depends on UCLIBC_HAS_LOCALE && UCLIBC_MJN3_ONLY
  802. default n
  803. help
  804. NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
  805. Answer Y if you want to include weak stub gettext support and
  806. make the *strerror*() and strsignal() functions gettext-aware.
  807. Currently, to get functional gettext functionality you will need
  808. to use gnu gettext.
  809. Most people will answer N.
  810. config UCLIBC_HAS_GNU_GETOPT
  811. bool "Support gnu getopt"
  812. default y
  813. help
  814. Answer Y if you want to include full gnu getopt() instead of a
  815. (much smaller) SUSv3 compatible getopt().
  816. Most people will answer Y.
  817. endmenu
  818. menu "Big and Tall"
  819. config UCLIBC_HAS_REGEX
  820. bool "Regular Expression Support"
  821. default y
  822. help
  823. POSIX regular expression code is really big -- 27k all by itself.
  824. If you don't use regular expressions, turn this off and save space.
  825. Of course, if you only staticly link, leave this on, since it will
  826. only be included in your apps if you use regular expressions.
  827. config UCLIBC_HAS_WORDEXP
  828. bool "Support the wordexp() interface"
  829. default n
  830. help
  831. The SuSv3 wordexp() interface performs word expansions per the Shell
  832. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  833. intended for use by applications that want to implement all of the
  834. standard Bourne shell expansions on input data.
  835. This interface is rarely used, and very large. Unless you have a
  836. pressing need for wordexp(), you should probably answer N.
  837. config UCLIBC_HAS_FTW
  838. bool "Support the ftw() and nftw() interfaces"
  839. default n
  840. help
  841. The SuSv3 ftw() and nftw() interfaces are used to recursively descend
  842. directory paths while repeatedly calling a function.
  843. This interface is rarely used, and adds around 4.5k. Unless you have
  844. a pressing need for ftw() or nftw(), you should probably answer N.
  845. config UCLIBC_HAS_GLOB
  846. bool "Support the glob() interface"
  847. default y
  848. help
  849. The glob interface is somewhat large (weighing in at about 4k). It
  850. is used fairly often, but is an option since people wanting to go for
  851. absolute minimum size may wish to omit it.
  852. Most people will answer Y.
  853. endmenu
  854. menu "Library Installation Options"
  855. config SHARED_LIB_LOADER_PREFIX
  856. string "Shared library loader path"
  857. depends on HAVE_SHARED
  858. default "$(RUNTIME_PREFIX)lib"
  859. help
  860. When using shared libraries, this path is the location where the
  861. shared library will be invoked. This value will be compiled into
  862. every binary compiled with uClibc.
  863. For a typical target system this should be set to "/lib", such that
  864. 'make install' will install /lib/ld-uClibc.so.0.
  865. BIG FAT WARNING:
  866. If you do not have a shared library loader with the correct name
  867. sitting in the directory this points to, your binaries will not
  868. run.
  869. config RUNTIME_PREFIX
  870. string "uClibc runtime library directory"
  871. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  872. help
  873. RUNTIME_PREFIX is the directory into which the uClibc runtime
  874. libraries will be installed. The result will look something
  875. like the following:
  876. $(RUNTIME_PREFIX)/
  877. lib/ <contains all runtime libraries>
  878. usr/bin/ldd <the ldd utility program>
  879. sbin/ldconfig <the ldconfig utility program>
  880. This value is used by the 'make install' Makefile target. Since this
  881. directory is compiled into the shared library loader, you will need to
  882. recompile uClibc if you change this value...
  883. For a typical target system this should be set to "/", such that
  884. 'make install' will install /lib/libuClibc-<VERSION>.so
  885. config DEVEL_PREFIX
  886. string "uClibc development environment directory"
  887. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  888. help
  889. DEVEL_PREFIX is the directory into which the uClibc development
  890. environment will be installed. The result will look something
  891. like the following:
  892. $(DEVEL_PREFIX)/
  893. lib/ <contains static libs>
  894. include/ <Where all the header files go>
  895. This value is used by the 'make install' Makefile target when
  896. installing a uClibc development environment.
  897. For a typical target system this should be set to "/usr", such that
  898. 'make install' will install /usr/include/<header files>.
  899. endmenu
  900. menu "Security options"
  901. config UCLIBC_BUILD_PIE
  902. bool "Build utilities as ET_DYN/PIE executables"
  903. depends on HAVE_SHARED
  904. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
  905. select FORCE_SHAREABLE_TEXT_SEGMENTS
  906. default n
  907. help
  908. If you answer Y here, ldd and iconv are built as ET_DYN/PIE executables.
  909. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  910. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  911. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so all
  912. libraries have to be built with -fPIC or -fpic, and all assembler
  913. functions must be written as position independent code (PIC).
  914. config HAVE_NO_SSP
  915. bool
  916. default n
  917. config UCLIBC_HAS_SSP
  918. bool "Support for propolice smashing stack protector"
  919. depends on !HAVE_NO_SSP
  920. default n
  921. help
  922. Add propolice smashing stack protector to the library.
  923. This requires a patched version of GCC or GCC 4.1, supporting the
  924. -fstack-protector[-all] options, with the __guard and
  925. __stack_smash_handler, respectively __stack_chk_guard and
  926. __stack_chk_fail functions removed from libgcc.
  927. These functions are added to libc instead.
  928. More information at:
  929. <http://www.research.ibm.com/trl/projects/security/ssp/>
  930. Most people will answer N.
  931. config SSP_QUICK_CANARY
  932. bool "Use simple guard values without accessing /dev/urandom"
  933. depends on UCLIBC_HAS_SSP
  934. default n
  935. help
  936. Use gettimeofday(2) to define the __guard without accessing
  937. /dev/urandom.
  938. WARNING: This makes smashing stack protector vulnerable to timing
  939. attacks.
  940. Most people will answer N.
  941. choice
  942. prompt "Propolice protection blocking signal"
  943. depends on UCLIBC_HAS_SSP
  944. default PROPOLICE_BLOCK_ABRT if ! DODEBUG
  945. default PROPOLICE_BLOCK_SEGV if DODEBUG
  946. help
  947. "abort" use SIGABRT to block offending programs.
  948. This is the default implementation.
  949. "segfault" use SIGSEGV to block offending programs.
  950. Use this for debugging.
  951. If unsure, answer "abort".
  952. config PROPOLICE_BLOCK_ABRT
  953. bool "abort"
  954. config PROPOLICE_BLOCK_SEGV
  955. bool "segfault"
  956. endchoice
  957. config UCLIBC_BUILD_SSP
  958. bool "Build uClibc with propolice protection"
  959. depends on UCLIBC_HAS_SSP
  960. default n
  961. help
  962. Build all libraries and executables with propolice protection enabled.
  963. config UCLIBC_BUILD_RELRO
  964. bool "Build uClibc with RELRO"
  965. depends on HAVE_SHARED
  966. default y
  967. help
  968. Build all libraries and executables with -z relro.
  969. config UCLIBC_BUILD_NOW
  970. bool "Build uClibc with NOW"
  971. depends on HAVE_SHARED
  972. default y
  973. help
  974. Build all libraries and executables with -z now.
  975. config UCLIBC_BUILD_NOEXECSTACK
  976. bool "Build uClibc with noexecstack marking"
  977. default y
  978. help
  979. Mark all assembler files as noexecstack. This will result in marking
  980. all libraries and executables built against uClibc not requiring
  981. executable stack.
  982. endmenu
  983. menu "uClibc development/debugging options"
  984. config CROSS_COMPILER_PREFIX
  985. string "Cross-compiling toolchain prefix"
  986. default ""
  987. help
  988. The prefix used to execute your cross-compiling toolchain. For
  989. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  990. then enter 'arm-linux-uclibc-' here.
  991. config DODEBUG
  992. bool "Build uClibc with debugging symbols"
  993. select PTHREADS_DEBUG_SUPPORT if UCLIBC_HAS_THREADS
  994. default n
  995. help
  996. Say Y here if you wish to compile uClibc with debugging symbols.
  997. This will allow you to use a debugger to examine uClibc internals
  998. while applications are running. This increases the size of the
  999. library considerably and should only be used when doing development.
  1000. If you are doing development and want to debug uClibc, answer Y.
  1001. Otherwise, answer N.
  1002. config DODEBUG_PT
  1003. bool "Build pthread with debugging output"
  1004. depends on UCLIBC_HAS_THREADS
  1005. default n
  1006. help
  1007. Enable debug output in libpthread. This is only useful when doing
  1008. development in libpthread itself.
  1009. Otherwise, answer N.
  1010. config DOASSERTS
  1011. bool "Build uClibc with run-time assertion testing"
  1012. default n
  1013. help
  1014. Say Y here to include runtime assertion tests.
  1015. This enables runtime assertion testing in some code, which can
  1016. increase the size of the library and incur runtime overhead.
  1017. If you say N, then this testing will be disabled.
  1018. config SUPPORT_LD_DEBUG
  1019. bool "Build the shared library loader with debugging support"
  1020. depends on HAVE_SHARED
  1021. default n
  1022. help
  1023. Answer Y here to enable all the extra code needed to debug the uClibc
  1024. native shared library loader. The level of debugging noise that is
  1025. generated depends on the LD_DEBUG environment variable... Just set
  1026. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1027. debug your application. Diagnostic messages will then be printed to
  1028. the stderr.
  1029. For now these debugging tokens are available:
  1030. detail provide more information for some options
  1031. move display copy processing
  1032. symbols display symbol table processing
  1033. reloc display relocation processing; detail shows the relocation patch
  1034. nofixups never fixes up jump relocations
  1035. bindings displays the resolve processing (function calls); detail shows the relocation patch
  1036. all Enable everything!
  1037. The additional environment variable:
  1038. LD_DEBUG_OUTPUT=file
  1039. redirects the diagnostics to an output file created using
  1040. the specified name and the process id as a suffix.
  1041. An excellent start is simply:
  1042. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1043. or to log everything to a file named 'logfile', try this
  1044. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1045. If you are doing development and want to debug uClibc's shared library
  1046. loader, answer Y. Mere mortals answer N.
  1047. config SUPPORT_LD_DEBUG_EARLY
  1048. bool "Build the shared library loader with early debugging support"
  1049. depends on HAVE_SHARED
  1050. default n
  1051. help
  1052. Answer Y here to if you find the uClibc shared library loader is
  1053. crashing or otherwise not working very early on. This is typical
  1054. only when starting a new port when you haven't figured out how to
  1055. properly get the values for argc, argv, environ, etc. This method
  1056. allows a degree of visibility into the very early shared library
  1057. loader initialization process. If you are doing development and want
  1058. to debug the uClibc shared library loader early initialization,
  1059. answer Y. Mere mortals answer N.
  1060. config UCLIBC_MALLOC_DEBUGGING
  1061. bool "Build malloc with debugging support"
  1062. depends MALLOC
  1063. default n
  1064. help
  1065. Answer Y here to compile extra debugging support code into malloc.
  1066. Malloc debugging output may then be enabled at runtime using the
  1067. MALLOC_DEBUG environment variable.
  1068. The value of MALLOC_DEBUG should be an integer, which is interpreted as
  1069. a bitmask with the following bits:
  1070. 1 - do extra consistency checking
  1071. 2 - output messages for malloc/free calls and OS allocation calls
  1072. 4 - output messages for the `MMB' layer
  1073. 8 - output messages for internal malloc heap manipulation calls
  1074. Because this increases the size of malloc appreciably (due to strings
  1075. etc), you should say N unless you need to debug a malloc problem.
  1076. config WARNINGS
  1077. string "Compiler Warnings"
  1078. default "-Wall"
  1079. help
  1080. Set this to the set of gcc warnings you wish to see while compiling.
  1081. config DOMULTI
  1082. bool "Compile all sources at once into an object"
  1083. default n
  1084. help
  1085. Set this to compile all sources at once into an object (IMA).
  1086. config UCLIBC_MJN3_ONLY
  1087. bool "Manuel's hidden warnings"
  1088. default n
  1089. help
  1090. Answer Y here to see all Manuel's personal notes, warnings, and todos.
  1091. Most people will answer N.
  1092. endmenu