Config.in 70 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see extra/config/Kconfig-language.txt
  4. #
  5. mainmenu "uClibc-ng $VERSION C Library Configuration"
  6. config DESIRED_TARGET_ARCH
  7. string
  8. option env="ARCH"
  9. config VERSION
  10. string
  11. option env="VERSION"
  12. choice
  13. prompt "Target Architecture"
  14. default TARGET_aarch64 if DESIRED_TARGET_ARCH = "aarch64"
  15. default TARGET_alpha if DESIRED_TARGET_ARCH = "alpha"
  16. default TARGET_arc if DESIRED_TARGET_ARCH = "arc"
  17. default TARGET_arm if DESIRED_TARGET_ARCH = "arm"
  18. default TARGET_avr32 if DESIRED_TARGET_ARCH = "avr32"
  19. default TARGET_bfin if DESIRED_TARGET_ARCH = "bfin"
  20. default TARGET_cris if DESIRED_TARGET_ARCH = "cris"
  21. default TARGET_csky if DESIRED_TARGET_ARCH = "csky"
  22. default TARGET_frv if DESIRED_TARGET_ARCH = "frv"
  23. default TARGET_h8300 if DESIRED_TARGET_ARCH = "h8300"
  24. default TARGET_hppa if DESIRED_TARGET_ARCH = "hppa"
  25. default TARGET_i386 if DESIRED_TARGET_ARCH = "i386"
  26. default TARGET_ia64 if DESIRED_TARGET_ARCH = "ia64"
  27. default TARGET_lm32 if DESIRED_TARGET_ARCH = "lm32"
  28. default TARGET_m68k if DESIRED_TARGET_ARCH = "m68k"
  29. default TARGET_metag if DESIRED_TARGET_ARCH = "metag"
  30. default TARGET_microblaze if DESIRED_TARGET_ARCH = "microblaze"
  31. default TARGET_mips if DESIRED_TARGET_ARCH = "mips"
  32. default TARGET_nds32 if DESIRED_TARGET_ARCH = "nds32"
  33. default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
  34. default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
  35. default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
  36. default TARGET_riscv64 if DESIRED_TARGET_ARCH = "riscv64"
  37. default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
  38. default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
  39. default TARGET_sparc64 if DESIRED_TARGET_ARCH = "sparc64"
  40. default TARGET_tile if DESIRED_TARGET_ARCH = "tile"
  41. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  42. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  43. help
  44. The architecture of your target.
  45. config TARGET_aarch64
  46. bool "aarch64"
  47. config TARGET_alpha
  48. bool "alpha"
  49. config TARGET_arc
  50. bool "arc"
  51. config TARGET_arm
  52. bool "arm"
  53. config TARGET_avr32
  54. bool "avr32"
  55. config TARGET_bfin
  56. bool "bfin"
  57. # someone could sync this tree:
  58. # http://linux-c6x.org/git/?p=uClibc.git;a=summary
  59. config TARGET_c6x
  60. bool "c6x"
  61. config TARGET_cris
  62. bool "cris"
  63. config TARGET_csky
  64. bool "csky"
  65. config TARGET_frv
  66. bool "frv"
  67. config TARGET_h8300
  68. bool "h8300"
  69. config TARGET_hppa
  70. bool "hppa"
  71. config TARGET_i386
  72. bool "i386"
  73. config TARGET_ia64
  74. bool "ia64"
  75. config TARGET_lm32
  76. bool "lm32"
  77. config TARGET_m68k
  78. bool "m68k"
  79. config TARGET_metag
  80. bool "metag"
  81. config TARGET_microblaze
  82. bool "microblaze"
  83. config TARGET_mips
  84. bool "mips"
  85. config TARGET_nds32
  86. bool "nds32"
  87. config TARGET_nios2
  88. bool "nios2"
  89. config TARGET_or1k
  90. bool "or1k"
  91. config TARGET_powerpc
  92. bool "powerpc"
  93. config TARGET_riscv64
  94. bool "riscv64"
  95. config TARGET_sh
  96. bool "superh"
  97. config TARGET_sparc
  98. bool "sparc"
  99. config TARGET_sparc64
  100. bool "sparc64"
  101. config TARGET_tile
  102. bool "tile"
  103. config TARGET_x86_64
  104. bool "x86_64"
  105. config TARGET_xtensa
  106. bool "xtensa"
  107. endchoice
  108. menu "Target Architecture Features and Options"
  109. if TARGET_aarch64
  110. source "extra/Configs/Config.aarch64"
  111. endif
  112. if TARGET_alpha
  113. source "extra/Configs/Config.alpha"
  114. endif
  115. if TARGET_arm
  116. source "extra/Configs/Config.arm"
  117. endif
  118. if TARGET_avr32
  119. source "extra/Configs/Config.avr32"
  120. endif
  121. if TARGET_bfin
  122. source "extra/Configs/Config.bfin"
  123. endif
  124. if TARGET_cris
  125. source "extra/Configs/Config.cris"
  126. endif
  127. if TARGET_csky
  128. source "extra/Configs/Config.csky"
  129. endif
  130. if TARGET_frv
  131. source "extra/Configs/Config.frv"
  132. endif
  133. if TARGET_h8300
  134. source "extra/Configs/Config.h8300"
  135. endif
  136. if TARGET_hppa
  137. source "extra/Configs/Config.hppa"
  138. endif
  139. if TARGET_i386
  140. source "extra/Configs/Config.i386"
  141. endif
  142. if TARGET_ia64
  143. source "extra/Configs/Config.ia64"
  144. endif
  145. if TARGET_lm32
  146. source "extra/Configs/Config.lm32"
  147. endif
  148. if TARGET_m68k
  149. source "extra/Configs/Config.m68k"
  150. endif
  151. if TARGET_metag
  152. source "extra/Configs/Config.metag"
  153. endif
  154. if TARGET_nds32
  155. source "extra/Configs/Config.nds32"
  156. endif
  157. if TARGET_nios2
  158. source "extra/Configs/Config.nios2"
  159. endif
  160. if TARGET_microblaze
  161. source "extra/Configs/Config.microblaze"
  162. endif
  163. if TARGET_mips
  164. source "extra/Configs/Config.mips"
  165. endif
  166. if TARGET_or1k
  167. source "extra/Configs/Config.or1k"
  168. endif
  169. if TARGET_powerpc
  170. source "extra/Configs/Config.powerpc"
  171. endif
  172. if TARGET_riscv64
  173. source "extra/Configs/Config.riscv64"
  174. endif
  175. if TARGET_sh
  176. source "extra/Configs/Config.sh"
  177. endif
  178. if TARGET_sparc
  179. source "extra/Configs/Config.sparc"
  180. endif
  181. if TARGET_sparc64
  182. source "extra/Configs/Config.sparc64"
  183. endif
  184. if TARGET_tile
  185. source "extra/Configs/Config.tile"
  186. endif
  187. if TARGET_x86_64
  188. source "extra/Configs/Config.x86_64"
  189. endif
  190. if TARGET_xtensa
  191. source "extra/Configs/Config.xtensa"
  192. endif
  193. if TARGET_c6x
  194. source "extra/Configs/Config.c6x"
  195. endif
  196. if TARGET_arc
  197. source "extra/Configs/Config.arc"
  198. endif
  199. config TARGET_SUBARCH
  200. string
  201. default "e500" if CONFIG_E500
  202. default "classic" if CONFIG_CLASSIC
  203. default "sh4" if CONFIG_SH4
  204. default "sh4" if CONFIG_SH4A
  205. default "" if CONFIG_386
  206. default "i486" if CONFIG_486
  207. default "i586" if CONFIG_586
  208. default "i686" if CONFIG_686
  209. default ""
  210. source "extra/Configs/Config.in.arch"
  211. endmenu
  212. menu "General Library Settings"
  213. config HAVE_NO_PIC
  214. bool
  215. config DOPIC
  216. bool "Generate only Position Independent Code (PIC)"
  217. default y
  218. depends on !HAVE_NO_PIC
  219. help
  220. If you wish to build all of uClibc as PIC objects, then answer Y here.
  221. If you are unsure, then you should answer N.
  222. config ARCH_HAS_NO_SHARED
  223. bool
  224. config ARCH_HAS_NO_LDSO
  225. bool
  226. select ARCH_HAS_NO_SHARED
  227. config ARCH_HAS_UCONTEXT
  228. bool
  229. config HAVE_SHARED
  230. bool "Enable shared libraries"
  231. depends on !ARCH_HAS_NO_SHARED
  232. default y
  233. help
  234. If you wish to build uClibc with support for shared libraries then
  235. answer Y here. If you only want to build uClibc as a static library,
  236. then answer N.
  237. config FORCE_SHAREABLE_TEXT_SEGMENTS
  238. bool "Only load shared libraries which can share their text segment"
  239. depends on HAVE_SHARED
  240. select DOPIC
  241. help
  242. If you answer Y here, the uClibc native shared library loader will
  243. only load shared libraries, which do not need to modify any
  244. non-writable segments. These libraries haven't set the DT_TEXTREL
  245. tag in the dynamic section (==> objdump).
  246. All your libraries must be compiled with -fPIC or -fpic, and all
  247. assembler function must be written as position independent code (PIC).
  248. Enabling this option will make uClibc's shared library loader a
  249. little bit smaller and guarantee that no memory will be wasted by
  250. badly coded shared libraries.
  251. config LDSO_LDD_SUPPORT
  252. bool "Native 'ldd' support"
  253. depends on HAVE_SHARED
  254. default y
  255. help
  256. Enable all the code needed to support traditional ldd,
  257. which executes the shared library loader to resolve all dependencies
  258. and then provide a list of shared libraries that are required for an
  259. application to function. Disabling this option will make uClibc's
  260. shared library loader a little bit smaller.
  261. Most people will answer Y.
  262. config LDSO_CACHE_SUPPORT
  263. bool "Enable library loader cache (ld.so.conf)"
  264. depends on HAVE_SHARED
  265. default y
  266. help
  267. Enable this to make use of /etc/ld.so.conf, the shared library loader
  268. cache configuration file to support for non-standard library paths.
  269. After updating this file, it is necessary to run 'ldconfig' to update
  270. the /etc/ld.so.cache shared library loader cache file.
  271. config LDSO_PRELOAD_ENV_SUPPORT
  272. bool "Enable library loader LD_PRELOAD environment"
  273. depends on HAVE_SHARED
  274. default y
  275. help
  276. Enable this to make use of LD_PRELOAD environment variable.
  277. A whitespace-separated list of additional, user-specified, ELF shared
  278. libraries to be loaded before all others. This can be used to
  279. selectively override functions in other shared libraries. For
  280. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  281. search directories that are also set-user-ID will be loaded.
  282. config LDSO_PRELOAD_FILE_SUPPORT
  283. bool "Enable library loader preload file (ld.so.preload)"
  284. depends on HAVE_SHARED
  285. help
  286. Enable this to make use of /etc/ld.so.preload. This file contains a
  287. whitespace separated list of shared libraries to be loaded before
  288. the program.
  289. config LDSO_BASE_FILENAME
  290. string "Shared library loader naming prefix"
  291. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  292. default "ld.so"
  293. help
  294. If you wish to support both uClibc and glibc on the same system, it
  295. is necessary to set this to something other than "ld.so" to avoid
  296. conflicts with glibc, which also uses "ld.so". This prevents both
  297. libraries from using the same /etc/ld.so.* files. If you wish to
  298. support both uClibc and glibc on the same system then you should set
  299. this to "ld-uClibc.so".
  300. Most people will leave this set to the default of "ld.so".
  301. WARNING: Changing the default prefix could cause problems with
  302. binutils' ld !
  303. config LDSO_STANDALONE_SUPPORT
  304. bool "Dynamic linker stand-alone mode support"
  305. depends on HAVE_SHARED
  306. help
  307. The dynamic linker can be run either indirectly through running some
  308. dynamically linked program or library (in which case no command line
  309. options to the dynamic linker can be passed and, in the ELF case, the
  310. dynamic linker which is stored in the .interp section of the program
  311. is executed) or directly by running:
  312. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  313. Stand-alone execution is a prerequisite for adding prelink
  314. capabilities to uClibc dynamic linker, as well useful for testing an
  315. updated version of the dynamic linker without breaking the system.
  316. config LDSO_PRELINK_SUPPORT
  317. bool "Dynamic linker prelink support"
  318. depends on HAVE_SHARED
  319. select LDSO_STANDALONE_SUPPORT
  320. help
  321. The dynamic linker can be used in stand-alone mode by the prelink tool
  322. for prelinking ELF shared libraries and binaries to speed up startup
  323. time. It also is able to load and handle prelinked libraries and
  324. binaries at runtime.
  325. config UCLIBC_STATIC_LDCONFIG
  326. bool "Link ldconfig statically"
  327. depends on HAVE_SHARED
  328. default y
  329. help
  330. Enable this option to statically link the ldconfig binary.
  331. Making ldconfig static can be beneficial if you have a library
  332. problem and need to use ldconfig to recover. Sometimes it is
  333. preferable to instead keep the size of the system down, in which
  334. case you should disable this option.
  335. config LDSO_RUNPATH
  336. bool "Enable ELF RUNPATH tag support"
  337. depends on HAVE_SHARED
  338. default y if LDSO_CACHE_SUPPORT
  339. help
  340. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  341. which extend the library search paths. They are really only useful
  342. if a package installs libraries in non standard locations and
  343. ld.so.conf support is disabled.
  344. Usage of RUNPATH tags is not too common, so disabling this feature
  345. should be safe for most people.
  346. config LDSO_RUNPATH_OF_EXECUTABLE
  347. bool "Use executables RUNPATH/RPATH when searching for libraries."
  348. depends on LDSO_RUNPATH
  349. default n
  350. help
  351. Use the executables RUNPATH/RPATH to find to find libraries even
  352. though this behavour is not standard. Setting this option causes
  353. the uclibc dynamic linker behavour to match the glibc dynamic linker.
  354. config LDSO_SAFE_RUNPATH
  355. bool "Allow only RUNPATH beginning with /"
  356. depends on LDSO_RUNPATH
  357. default y
  358. help
  359. Allow only absolute path in RPATH/RUNPATH.
  360. config LDSO_SEARCH_INTERP_PATH
  361. bool "Add ldso path to lib search path"
  362. depends on HAVE_SHARED
  363. default y
  364. help
  365. The ldso is told where it is being executed from and can use that
  366. path to find related core libraries. This is useful by default,
  367. but can be annoying in a mixed development environment.
  368. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  369. library search with /foo/boo/
  370. If unsure, simply say Y here.
  371. config LDSO_LD_LIBRARY_PATH
  372. bool "Add LD_LIBRARY_PATH to lib search path"
  373. depends on HAVE_SHARED
  374. default y
  375. help
  376. On hardened system it could be useful to disable the use of
  377. LD_LIBRARY_PATH environment variable (a colon-separated list of
  378. directories in which to search for ELF libraries at execution-time).
  379. If unsure, simply say Y here.
  380. config UCLIBC_CTOR_DTOR
  381. bool
  382. default y if !TARGET_riscv64
  383. help
  384. If you wish to build uClibc with support for global constructor
  385. (ctor) and global destructor (dtor) support, then answer Y here.
  386. When ctor/dtor support is enabled, binaries linked with uClibc must
  387. also be linked with crtbegin.o and crtend.o which are provided by gcc
  388. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  389. may need to be adjusted to include these files). This support will
  390. also add a small amount of additional size to each binary compiled vs
  391. uClibc. If you will be using uClibc with C++, or if you need the gcc
  392. __attribute__((constructor)) and __attribute__((destructor)) to work,
  393. then you definitely want to answer Y here. If you don't need ctors
  394. or dtors and want your binaries to be as small as possible, then
  395. answer N.
  396. config LDSO_GNU_HASH_SUPPORT
  397. bool "Enable GNU hash style support"
  398. depends on HAVE_SHARED
  399. help
  400. Newest binutils support a new hash style named GNU-hash. The dynamic
  401. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  402. if present into the ELF binaries, otherwise it will use the old SysV
  403. hash style (.hash). This ensures that it is completely backward
  404. compatible.
  405. Further, being the hash table implementation self-contained into each
  406. executable and shared libraries, objects with mixed hash style can
  407. peacefully coexist in the same process.
  408. If you want to use this new feature, answer Y
  409. choice
  410. prompt "Thread support"
  411. default HAS_NO_THREADS
  412. help
  413. If you want to compile uClibc with pthread support, then answer Y.
  414. This will increase the size of uClibc by adding a bunch of locking
  415. to critical data structures, and adding extra code to ensure that
  416. functions are properly reentrant.
  417. config HAS_NO_THREADS
  418. bool "none"
  419. help
  420. Disable thread support.
  421. config UCLIBC_HAS_LINUXTHREADS
  422. bool "Linuxthreads"
  423. # linuxthreads need nanosleep()
  424. select UCLIBC_HAS_REALTIME
  425. depends on !TARGET_aarch64 && \
  426. !TARGET_riscv64 && \
  427. !TARGET_metag
  428. help
  429. If you want to compile uClibc with Linuxthreads support, then answer Y.
  430. config UCLIBC_HAS_THREADS_NATIVE
  431. bool "Native POSIX Threading (NPTL)"
  432. select UCLIBC_HAS_TLS
  433. select UCLIBC_HAS_STDIO_FUTEXES
  434. select UCLIBC_HAS_REALTIME
  435. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  436. depends on !CONFIG_386 && \
  437. !TARGET_alpha && \
  438. !TARGET_avr32 && \
  439. !TARGET_bfin && \
  440. !TARGET_c6x && \
  441. !TARGET_cris && \
  442. !TARGET_frv && \
  443. !TARGET_h8300 && \
  444. !TARGET_hppa && \
  445. !TARGET_ia64 && \
  446. (ARCH_USE_MMU || TARGET_arm)
  447. help
  448. If you want to compile uClibc with NPTL support, then answer Y.
  449. endchoice
  450. config UCLIBC_HAS_THREADS
  451. def_bool y if !HAS_NO_THREADS
  452. config UCLIBC_HAS_TLS
  453. bool "Thread-Local Storage"
  454. depends on UCLIBC_HAS_THREADS_NATIVE
  455. help
  456. If you want to enable TLS support then answer Y.
  457. This is fast an efficient way to store per-thread local data
  458. which is not on stack. It needs __thread support enabled in
  459. gcc.
  460. config PTHREADS_DEBUG_SUPPORT
  461. bool "Build pthreads debugging support"
  462. depends on UCLIBC_HAS_THREADS
  463. help
  464. Say Y here if you wish to be able to debug applications that use
  465. uClibc's pthreads library. By enabling this option, a library
  466. named libthread_db will be built. This library will be dlopen()'d
  467. by gdb and will allow gdb to debug the threads in your application.
  468. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  469. you must compile gdb with uClibc in order for pthread debugging to
  470. work properly.
  471. If you are doing development and want to debug applications using
  472. uClibc's pthread library, answer Y. Otherwise, answer N.
  473. config UCLIBC_HAS_SYSLOG
  474. bool "Syslog support"
  475. default y
  476. depends on UCLIBC_HAS_NETWORK_SUPPORT
  477. select UCLIBC_HAS_SOCKET
  478. help
  479. Support sending messages to the system logger.
  480. This requires socket-support.
  481. config UCLIBC_HAS_LFS
  482. def_bool y
  483. help
  484. Large file support (always enabled; config symbol retained for
  485. feature test to be compatible with uClibc).
  486. choice
  487. prompt "Malloc Implementation"
  488. default MALLOC if ! ARCH_USE_MMU
  489. default MALLOC_STANDARD if ARCH_USE_MMU
  490. config MALLOC
  491. bool "malloc"
  492. help
  493. "malloc" use mmap for all allocations and so works very well on
  494. MMU-less systems that do not support the brk() system call. It is
  495. pretty smart about reusing already allocated memory, and minimizing
  496. memory wastage.
  497. This is the default for uClinux MMU-less systems.
  498. config MALLOC_SIMPLE
  499. bool "malloc-simple"
  500. help
  501. "malloc-simple" is trivially simple and slow as molasses. It
  502. was written from scratch for uClibc, and is the simplest possible
  503. (and therefore smallest) malloc implementation.
  504. This uses only the mmap() system call to allocate and free memory,
  505. and does not use the brk() system call at all, making it a fine
  506. choice for MMU-less systems with very limited memory. It's 100%
  507. standards compliant, thread safe, very small, and releases freed
  508. memory back to the OS immediately rather than keeping it in the
  509. process's heap for reallocation. It is also VERY SLOW.
  510. config MALLOC_STANDARD
  511. bool "malloc-standard"
  512. depends on ARCH_USE_MMU
  513. help
  514. "malloc-standard" is derived from the public domain dlmalloc
  515. implementation by Doug Lea. It is quite fast, and is pretty smart
  516. about reusing already allocated memory, and minimizing memory
  517. wastage. This uses brk() for small allocations, while using mmap()
  518. for larger allocations. This is the default malloc implementation
  519. for uClibc.
  520. If unsure, answer "malloc-standard".
  521. endchoice
  522. config UCLIBC_DYNAMIC_ATEXIT
  523. bool "Dynamic atexit() Support"
  524. default y
  525. help
  526. When this option is enabled, uClibc will support an infinite number,
  527. of atexit() and on_exit() functions, limited only by your available
  528. memory. This can be important when uClibc is used with C++, since
  529. global destructors are implemented via atexit(), and it is quite
  530. possible to exceed the default number when this option is disabled.
  531. Enabling this option adds a few bytes, and more significantly makes
  532. atexit and on_exit depend on malloc, which can be bad when compiling
  533. static executables.
  534. Unless you use uClibc with C++, you should probably answer N.
  535. config UCLIBC_HAS_UTMPX
  536. bool "utmpx based support for tracking login/logouts to/from the system"
  537. help
  538. Answer y to enable support for accessing user accounting database.
  539. It can be used to track all login/logout to the system.
  540. config UCLIBC_HAS_UTMP
  541. bool "utmp support (XPG2 compat, SVr4 compat)"
  542. depends on UCLIBC_HAS_UTMPX
  543. help
  544. Answer y to enable legacy SVID support for accessing
  545. user accounting database:
  546. getutent(), getutid(), getutline(), pututline(),
  547. setutent(), endutent(), utmpname() in utmp.h
  548. It can be used to track all login/logout to the system.
  549. If unsure, answer N and use corresponding POSIX functions
  550. from utmpx.h
  551. config UCLIBC_SUSV2_LEGACY
  552. bool "Enable SuSv2 LEGACY functions"
  553. help
  554. Enable this option if you want to have SuSv2 LEGACY functions
  555. Currently applies to:
  556. valloc
  557. WARNING! ABI incompatibility.
  558. config UCLIBC_SUSV3_LEGACY
  559. bool "Enable SuSv3 LEGACY functions"
  560. #vfork,
  561. # h_errno
  562. # gethostbyaddr
  563. # gethostbyname
  564. help
  565. Enable this option if you want to have SuSv3 LEGACY functions
  566. in the library, else they are replaced by SuSv3 proposed macros.
  567. Currently applies to:
  568. bcmp, bcopy, bzero, index, rindex, ftime,
  569. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  570. (getwd), (makecontext),
  571. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  572. scalb, (setcontext), (swapcontext), ualarm, usleep,
  573. wcswcs.
  574. WARNING! ABI incompatibility.
  575. config UCLIBC_HAS_CONTEXT_FUNCS
  576. bool "Use obsolescent context control functions"
  577. depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
  578. help
  579. Add into library the SuSv3 obsolescent functions used for context
  580. control. The setcontext family allows the implementation in C of
  581. advanced control flow patterns such as iterators, fibers, and
  582. coroutines. They may be viewed as an advanced version of
  583. setjmp/longjmp; whereas the latter allows only a single non-local jump
  584. up the stack, setcontext allows the creation of multiple cooperative
  585. threads of control, each with its own stack.
  586. These functions are: setcontext, getcontext, makecontext, swapcontext.
  587. config UCLIBC_SUSV3_LEGACY_MACROS
  588. bool "Enable SuSv3 LEGACY macros"
  589. help
  590. Enable this option if you want to have SuSv3 LEGACY macros.
  591. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  592. WARNING! ABI incompatibility.
  593. config UCLIBC_SUSV4_LEGACY
  594. bool "Enable SuSv4 LEGACY or obsolescent functions"
  595. help
  596. Enable this option if you want to have SuSv4 LEGACY functions
  597. and macros in the library.
  598. Currently applies to:
  599. - XSI functions:
  600. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  601. gettimeofday, isascii, pthread_getconcurrency,
  602. pthread_setconcurrency, setitimer, setpgrp, sighold,
  603. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  604. tempnam, toascii, ulimit.
  605. - Base functions:
  606. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  607. tmpnam, utime.
  608. WARNING! ABI incompatibility.
  609. config UCLIBC_STRICT_HEADERS
  610. bool "Hide structures and constants for unsupported features"
  611. help
  612. Hide structures and constants in headers that should not be used,
  613. because the respective feature is disabled.
  614. WARNING! enabling this option requires to patch many faulty apps,
  615. since they make (wrongly) use of these structures/constants,
  616. although the feature was disabled.
  617. config UCLIBC_HAS_STUBS
  618. bool "Provide stubs for unavailable functionality"
  619. help
  620. With this option uClibc provides non-functional stubs for
  621. functions which are impossible to implement on the target
  622. architecture. Otherwise, such functions are simply omitted.
  623. config UCLIBC_HAS_SHADOW
  624. bool "Shadow Password Support"
  625. default y
  626. help
  627. Answer N if you do not need shadow password support.
  628. Most people will answer Y.
  629. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  630. bool "Support for program_invocation_name"
  631. help
  632. Support for the GNU-specific program_invocation_name and
  633. program_invocation_short_name strings. Some GNU packages
  634. (like tar and coreutils) utilize these for extra useful
  635. output, but in general are not required.
  636. At startup, these external strings are automatically set
  637. up based on the value of ARGV[0].
  638. If unsure, just answer N.
  639. config UCLIBC_HAS___PROGNAME
  640. bool "Support for __progname"
  641. default y
  642. help
  643. Some packages (like openssh) like to peek into internal libc
  644. symbols to make their output a bit more user friendly.
  645. At startup, __progname is automatically set up based on the
  646. value of ARGV[0].
  647. If unsure, just answer N.
  648. config UCLIBC_HAS_PTY
  649. bool "Support for pseudo-terminals"
  650. default y
  651. help
  652. This enables support for pseudo-terminals (see man 4 pts
  653. and man 7 pty).
  654. If unsure, just answer Y.
  655. config ASSUME_DEVPTS
  656. bool "Assume that /dev/pts is a devpts or devfs file system"
  657. default y
  658. depends on UCLIBC_HAS_PTY
  659. help
  660. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  661. these filesystems automatically manage permissions on the /dev/pts
  662. devices. You may need to mount your devpts or devfs filesystem on
  663. /dev/pts for this to work.
  664. Most people should answer Y.
  665. config UNIX98PTY_ONLY
  666. bool "Support only Unix 98 PTYs"
  667. default y
  668. depends on UCLIBC_HAS_PTY
  669. help
  670. If you want to support only Unix 98 PTYs enable this. Some older
  671. applications may need this disabled and will thus use legacy BSD
  672. style PTY handling which is more complex and also bigger than
  673. Unix 98 PTY handling.
  674. For most current programs, you can generally answer Y.
  675. if UNIX98PTY_ONLY
  676. config UCLIBC_HAS_GETPT
  677. bool "Support getpt() (glibc-compat)"
  678. depends on UCLIBC_HAS_PTY
  679. help
  680. Some packages may need getpt().
  681. All of those are non-standard and can be considered
  682. GNU/libc compatibility.
  683. Either use posix_openpt() or just open /dev/ptmx yourself.
  684. If unsure, just say N.
  685. endif
  686. if !UNIX98PTY_ONLY
  687. # Have to use __libc_ptyname{1,2}[] and related bloat
  688. config UCLIBC_HAS_GETPT
  689. def_bool y
  690. endif
  691. config UCLIBC_HAS_LIBUTIL
  692. bool "Provide libutil library and functions"
  693. depends on UCLIBC_HAS_PTY
  694. help
  695. Provide a libutil library.
  696. This non-standard conforming library provides the following
  697. utility functions:
  698. forkpty(): combines openpty(), fork(2), and login_tty() to
  699. create a new process operating in a pseudo-terminal.
  700. login(): write utmp and wtmp entries
  701. login_tty(): prepares for a login on the tty fd by creating a
  702. new session, making fd the controlling terminal for
  703. the calling process, setting fd to be the standard
  704. input, output, and error streams of the current
  705. process, and closing fd.
  706. logout(): write utmp and wtmp entries
  707. logwtmp(): constructs a utmp structure and calls updwtmp() to
  708. append the structure to the utmp file.
  709. openpty(): finds an available pseudo-terminal and returns
  710. file descriptors for the master and slave
  711. This library adds about 3k-4k to your system.
  712. config UCLIBC_HAS_TM_EXTENSIONS
  713. bool "Support 'struct tm' timezone extension fields"
  714. default y
  715. help
  716. Enabling this option adds fields to 'struct tm' in time.h for
  717. tracking the number of seconds east of UTC, and an abbreviation for
  718. the current timezone. These fields are not specified by the SuSv3
  719. standard, but they are commonly used in both GNU and BSD application
  720. code.
  721. To strictly follow the SuSv3 standard, leave this disabled.
  722. Most people will probably want to answer Y.
  723. config UCLIBC_HAS_TZ_CACHING
  724. bool "Enable caching of the last valid timezone 'TZ' string"
  725. default y
  726. help
  727. Answer Y to enable caching of the last valid 'TZ' string describing
  728. the timezone setting. This allows a quick string compare to avoid
  729. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  730. Most people will answer Y.
  731. config UCLIBC_HAS_TZ_FILE
  732. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  733. default y
  734. help
  735. Answer Y to enable the setting of a default timezone for uClibc.
  736. Ordinarily, uClibc gets the timezone information exclusively from the
  737. 'TZ' environment variable. In particular, there is no support for
  738. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  739. With this option enabled, uClibc will use the value stored in the
  740. file '/etc/TZ' (default path) to obtain timezone information if the
  741. 'TZ' environment variable is missing or has an invalid value. The
  742. file consists of a single line (newline required) of text describing
  743. the timezone in the format specified for the TZ environment variable.
  744. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  745. See
  746. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  747. for details on valid settings of 'TZ'.
  748. Most people will answer Y.
  749. config UCLIBC_HAS_TZ_FILE_READ_MANY
  750. bool "Repeatedly read the '/etc/TZ' file"
  751. depends on UCLIBC_HAS_TZ_FILE
  752. default y
  753. help
  754. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  755. a valid value has been read. This incurs the overhead of an
  756. open/read/close for each tzset() call (explicit or implied). However,
  757. setting this will allow applications to update their timezone
  758. information if the contents of the file change.
  759. Most people will answer Y.
  760. config UCLIBC_TZ_FILE_PATH
  761. string "Path to the 'TZ' file for setting the global timezone"
  762. depends on UCLIBC_HAS_TZ_FILE
  763. default "/etc/TZ"
  764. help
  765. This is the path to the 'TZ' file.
  766. Most people will use the default of '/etc/TZ'.
  767. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  768. bool "Use /etc/localtime as a fallback"
  769. depends on UCLIBC_HAS_TZ_FILE
  770. default y
  771. help
  772. Answer Y to try to use /etc/localtime file.
  773. On glibc systems this file (if it is in TZif2 format)
  774. contains timezone string at the end.
  775. Most people will answer Y.
  776. endmenu
  777. menu "Advanced Library Settings"
  778. config UCLIBC_PWD_BUFFER_SIZE
  779. int "Buffer size for getpwnam() and friends"
  780. default 256
  781. range 12 1024
  782. help
  783. This sets the value of the buffer size for getpwnam() and friends.
  784. By default, this is 256. (For reference, glibc uses 1024).
  785. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  786. parameter.
  787. config UCLIBC_GRP_BUFFER_SIZE
  788. int "Buffer size for getgrnam() and friends"
  789. default 256
  790. range 12 1024
  791. help
  792. This sets the value of the buffer size for getgrnam() and friends.
  793. By default, this is 256. (For reference, glibc uses 1024).
  794. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  795. parameter.
  796. comment "Support various families of functions"
  797. config UCLIBC_LINUX_SPECIFIC
  798. bool "Linux specific functions"
  799. default y
  800. help
  801. accept4(), bdflush(),
  802. capget(), capset(), eventfd(), fallocate(),
  803. fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
  804. madvise(), modify_ldt(), pipe2(), personality(),
  805. prctl()/arch_prctl(), pivot_root(), modify_ldt(),
  806. ppoll(), readahead(), reboot(), remap_file_pages(),
  807. sched_getaffinity(), sched_setaffinity(), sendfile(),
  808. setfsgid(), setfsuid(), setresgid(), setresuid(),
  809. splice(), vmsplice(), tee(), signalfd(), statfs(),
  810. swapoff(), swapon(), sync_file_range(), syncfs(),
  811. _sysctl(), sysinfo(), timerfd_*(), vhangup(), umount(),
  812. umount2()
  813. config UCLIBC_HAS_GNU_ERROR
  814. bool "Support GNU extensions for error-reporting"
  815. default y
  816. help
  817. Support for the GNU-specific error(), error_at_line(),
  818. void (* error_print_progname)(), error_message_count
  819. functions and variables. Some GNU packages
  820. utilize these for extra useful output, but in general
  821. are not required.
  822. If unsure, just answer N.
  823. config UCLIBC_BSD_SPECIFIC
  824. bool "BSD specific functions"
  825. default y
  826. help
  827. mincore(), getdomainname(), setdomainname()
  828. If unsure, say N.
  829. config UCLIBC_HAS_BSD_ERR
  830. bool "BSD err functions"
  831. default y
  832. help
  833. These functions are non-standard BSD extensions.
  834. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  835. If unsure, say N.
  836. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  837. bool "BSD obsolete signal functions"
  838. help
  839. These functions are provided as a compatibility interface for
  840. programs that make use of the historical System V signal API.
  841. This API is obsolete:
  842. new applications should use the POSIX signal API (sigaction(2),
  843. sigprocmask(2), etc.).
  844. Affected functions:
  845. sigset(), sighold(), sigrelse(), sigignore()
  846. If unsure, say N.
  847. config UCLIBC_HAS_BSD_B64_NTOP_B64_PTON
  848. bool "Support b64_ntop(), b64_pton() (bsd-compat)"
  849. help
  850. Answer Y if you need additional BSD compatibility
  851. (e.g. for openbsd-netcat).
  852. Most people will say N.
  853. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  854. bool "SYSV obsolete signal functions"
  855. help
  856. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  857. If unsure, say N.
  858. config UCLIBC_NTP_LEGACY
  859. bool "ntp_*() aliases"
  860. help
  861. Provide legacy aliases for ntp functions:
  862. ntp_adjtime(), ntp_gettime()
  863. It is safe to say N here.
  864. config UCLIBC_SV4_DEPRECATED
  865. bool "Enable SVr4 deprecated functions"
  866. help
  867. These functions are DEPRECATED in System V release 4.
  868. Say N unless you desparately need one of the functions below:
  869. ustat() [use statfs(2) in your code instead]
  870. config UCLIBC_HAS_REALTIME
  871. bool "Realtime-related family of SUSv functions"
  872. default y
  873. help
  874. These functions are part of the Timers option and need not
  875. be available on all implementations.
  876. Includes AIO, message-queue, scheduler, semaphore functions:
  877. aio.h
  878. mqueue.h
  879. sched.h
  880. semaphore.h
  881. aio_cancel()
  882. aio_error()
  883. aio_fsync()
  884. aio_read()
  885. lio_listio()
  886. aio_return()
  887. aio_suspend()
  888. aio_write()
  889. clock_getres(), clock_gettime(), clock_settime()
  890. fdatasync()
  891. mlockall(), munlockall()
  892. mlock(), munlock()
  893. mq_close()
  894. mq_getattr()
  895. mq_notify()
  896. mq_open()
  897. mq_receive()
  898. mq_send()
  899. mq_setattr()
  900. mq_unlink()
  901. nanosleep()
  902. sched_getparam()
  903. sched_get_priority_max(), sched_get_priority_min()
  904. sched_getscheduler()
  905. sched_rr_get_interval()
  906. sched_setparam()
  907. sched_setscheduler()
  908. sem_close()
  909. sem_destroy()
  910. sem_getvalue()
  911. sem_init()
  912. sem_open()
  913. sem_post()
  914. sem_trywait(), sem_wait()
  915. sem_unlink()
  916. sigqueue()
  917. sigtimedwait(), sigwaitinfo()
  918. timer_create()
  919. timer_delete()
  920. timer_getoverrun(), timer_gettime(), timer_settime()
  921. config UCLIBC_HAS_ADVANCED_REALTIME
  922. bool "Advanced realtime-related family of SUSv functions"
  923. default y
  924. depends on UCLIBC_HAS_REALTIME
  925. help
  926. These functions are part of the Timers option and need not
  927. be available on all implementations.
  928. clock_getcpuclockid()
  929. clock_nanosleep()
  930. mq_timedreceive()
  931. mq_timedsend()
  932. posix_fadvise()
  933. posix_fallocate()
  934. posix_madvise()
  935. posix_memalign()
  936. posix_mem_offset()
  937. posix_spawnattr_destroy(), posix_spawnattr_init()
  938. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  939. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  940. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  941. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  942. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  943. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  944. posix_spawn_file_actions_addclose()
  945. posix_spawn_file_actions_adddup2()
  946. posix_spawn_file_actions_addopen()
  947. posix_spawn_file_actions_destroy()
  948. posix_spawn_file_actions_init()
  949. posix_spawn()
  950. posix_spawnp()
  951. posix_typed_mem_get_info()
  952. pthread_mutex_timedlock()
  953. sem_timedwait()
  954. #config UCLIBC_HAS_TERMIOS
  955. # bool "termios functions"
  956. # default y
  957. # help
  958. # Get and set terminal attributes, line control, get and set baud
  959. # rate.
  960. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  961. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  962. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  963. #
  964. # If unsure, say Y.
  965. config UCLIBC_HAS_EPOLL
  966. bool "epoll"
  967. default y
  968. help
  969. epoll_create(), epoll_ctl(), epoll_wait() functions.
  970. config UCLIBC_HAS_XATTR
  971. bool "Extended Attributes"
  972. default y
  973. help
  974. Extended Attributes support.
  975. setxattr()
  976. lsetxattr()
  977. fsetxattr()
  978. getxattr()
  979. lgetxattr()
  980. fgetxattr()
  981. listxattr()
  982. llistxattr()
  983. flistxattr()
  984. removexattr()
  985. lremovexattr()
  986. fremovexattr()
  987. Say N unless you need support for extended attributes and the
  988. filesystems do actually support them.
  989. config UCLIBC_HAS_PROFILING
  990. bool "Profiling support"
  991. default y
  992. help
  993. gcc's -finstrument-functions needs these.
  994. Most people can safely answer N.
  995. config UCLIBC_HAS_CRYPT_IMPL
  996. bool "libcrypt support"
  997. default y
  998. help
  999. libcrypt contains crypt(), setkey() and encrypt()
  1000. config UCLIBC_HAS_SHA256_CRYPT_IMPL
  1001. bool "libcrypt SHA256 support"
  1002. depends on UCLIBC_HAS_CRYPT_IMPL
  1003. help
  1004. This adds support for SHA256 password hashing via the crypt() function.
  1005. Say N here if you do not need SHA256 crypt support.
  1006. config UCLIBC_HAS_SHA512_CRYPT_IMPL
  1007. bool "libcrypt SHA512 support"
  1008. depends on UCLIBC_HAS_CRYPT_IMPL
  1009. help
  1010. This adds support for SHA512 password hashing via the crypt() function.
  1011. Say N here if you do not need SHA512 crypt support.
  1012. config UCLIBC_HAS_CRYPT_STUB
  1013. bool "libcrypt stubs"
  1014. default y
  1015. depends on !UCLIBC_HAS_CRYPT_IMPL
  1016. help
  1017. Standards mandate that crypt(3) provides a stub if it is unavailable.
  1018. If you enable this option then stubs for
  1019. crypt(), setkey() and encrypt()
  1020. will be provided in a small libcrypt.
  1021. config UCLIBC_HAS_CRYPT
  1022. def_bool y
  1023. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  1024. endmenu
  1025. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  1026. bool "Networking Support"
  1027. default y
  1028. help
  1029. Say N here if you do not need network support.
  1030. if UCLIBC_HAS_NETWORK_SUPPORT
  1031. config UCLIBC_HAS_SOCKET
  1032. bool "Socket support"
  1033. default y
  1034. help
  1035. If you want to include support for sockets then answer Y.
  1036. config UCLIBC_HAS_IPV4
  1037. bool "IP version 4 support"
  1038. default y
  1039. select UCLIBC_HAS_SOCKET
  1040. help
  1041. If you want to include support for the Internet Protocol
  1042. (IP version 4) then answer Y.
  1043. Most people will say Y.
  1044. config UCLIBC_HAS_IPV6
  1045. bool "IP version 6 support"
  1046. select UCLIBC_HAS_SOCKET
  1047. help
  1048. If you want to include support for the next version of the Internet
  1049. Protocol (IP version 6) then answer Y.
  1050. Most people should answer N.
  1051. config UCLIBC_USE_NETLINK
  1052. bool "Use netlink to query interfaces"
  1053. depends on UCLIBC_HAS_SOCKET
  1054. help
  1055. In newer versions of Linux (2.4.17+), support was added for querying
  1056. network device information via netlink rather than the old style
  1057. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1058. it is smaller than netlink), but if you find that not all of your
  1059. devices are being returned by the if_nameindex() function, you will
  1060. have to use the netlink implementation.
  1061. Most people can safely answer N.
  1062. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1063. bool "Support the AI_ADDRCONFIG flag"
  1064. depends on UCLIBC_USE_NETLINK
  1065. help
  1066. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1067. implementation using netlink to query interfaces to find both
  1068. ipv4 and ipv6 support. This is only needed if an application uses
  1069. the AI_ADDRCONFIG flag.
  1070. Most people can safely answer N.
  1071. config UCLIBC_HAS_BSD_RES_CLOSE
  1072. bool "Support res_close() (bsd-compat)"
  1073. help
  1074. Answer Y if you desperately want to support BSD compatibility in
  1075. the network code.
  1076. Most people will say N.
  1077. config UCLIBC_HAS_COMPAT_RES_STATE
  1078. bool "Use compatible but bloated _res"
  1079. default y
  1080. help
  1081. Answer Y if you build network utilities and they muck with resolver
  1082. internals a lot (_res global structure). uclibc does not use most
  1083. of _res.XXX fields, and with this option OFF they won't even exist.
  1084. Which will make e.g. dig build fail.
  1085. Answering N saves around 400 bytes in bss.
  1086. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1087. bool "Use extra compatible but extra bloated _res"
  1088. help
  1089. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1090. As far as I can say, this should never be needed.
  1091. config UCLIBC_HAS_RESOLVER_SUPPORT
  1092. bool "DNS resolver functions"
  1093. select UCLIBC_HAS_COMPAT_RES_STATE
  1094. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1095. help
  1096. Provide implementations for DNS resolver functions.
  1097. In particular, the following functions will be added to the
  1098. library:
  1099. ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
  1100. res_mkquery, res_init, res_ninit, res_close, res_nclose
  1101. res_query, res_search, res_querydomain,
  1102. dn_expand, dn_comp,
  1103. ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
  1104. ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
  1105. ns_get16, ns_get32, ns_put16, ns_put32
  1106. endif
  1107. menu "String and Stdio Support"
  1108. config UCLIBC_HAS_STRING_GENERIC_OPT
  1109. bool "Use faster (but larger) generic string functions"
  1110. default y
  1111. help
  1112. Answer Y to use the (tweaked) glibc generic string functions.
  1113. In general, they are faster (but 3-5K larger) than the base
  1114. uClibc string functions which are optimized solely for size.
  1115. Many people will answer Y.
  1116. config UCLIBC_HAS_STRING_ARCH_OPT
  1117. bool "Use arch-specific assembly string functions (where available)"
  1118. default y
  1119. help
  1120. Answer Y to use any archtecture-specific assembly language string
  1121. functions available for this target plaform.
  1122. Note that assembly implementations are not available for all string
  1123. functions, so some generic (written in C) string functions may
  1124. still be used.
  1125. These are small and fast, the only reason _not_ to say Y here is
  1126. for debugging purposes.
  1127. config UCLIBC_HAS_STDIO_FUTEXES
  1128. bool "Use futexes for multithreaded I/O locking"
  1129. depends on UCLIBC_HAS_THREADS_NATIVE
  1130. help
  1131. If you want to compile uClibc to use futexes for low-level
  1132. I/O locking, answer Y. Otherwise, answer N.
  1133. config UCLIBC_HAS_CTYPE_TABLES
  1134. bool "Use Table Versions Of 'ctype.h' Functions."
  1135. default y
  1136. help
  1137. Answer Y to use table versions of the 'ctype.h' functions.
  1138. While the non-table versions are often smaller when building
  1139. statically linked apps, they work only in stub locale mode.
  1140. Most people will answer Y.
  1141. config UCLIBC_HAS_CTYPE_SIGNED
  1142. bool "Support Signed Characters In 'ctype.h' Functions."
  1143. depends on UCLIBC_HAS_CTYPE_TABLES
  1144. default y
  1145. help
  1146. Answer Y to enable support for passing signed char values to
  1147. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1148. these functions are only defined for unsigned char values and
  1149. EOF. However, glibc allows negative signed char values as well
  1150. in order to support 'broken old programs'.
  1151. Most people will answer Y.
  1152. choice
  1153. prompt "ctype argument checking"
  1154. depends on UCLIBC_HAS_CTYPE_TABLES
  1155. default UCLIBC_HAS_CTYPE_UNSAFE
  1156. help
  1157. Please select the invalid arg behavior you want for the 'ctype'
  1158. functions.
  1159. The 'ctype' functions are now implemented using table lookups, with
  1160. the arg being the index. This can result in incorrect memory accesses
  1161. or even segfaults for args outside of the allowed range.
  1162. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1163. the macro implementations.
  1164. config UCLIBC_HAS_CTYPE_UNSAFE
  1165. bool "Do not check -- unsafe"
  1166. config UCLIBC_HAS_CTYPE_CHECKED
  1167. bool "Detect and handle appropriately"
  1168. config UCLIBC_HAS_CTYPE_ENFORCED
  1169. bool "Issue a diagnostic and abort()"
  1170. endchoice
  1171. config UCLIBC_HAS_WCHAR
  1172. bool "Wide Character Support"
  1173. help
  1174. Answer Y to enable wide character support. This will make uClibc
  1175. much larger. It is also currently required for locale support.
  1176. Most people will answer N.
  1177. config UCLIBC_HAS_LIBICONV
  1178. bool "Iconv Support"
  1179. select UCLIBC_HAS_WCHAR
  1180. help
  1181. Add tiny iconv support for charset conversion from and to UTF-8.
  1182. config UCLIBC_HAS_LIBINTL
  1183. bool "Intl stubs support"
  1184. help
  1185. If you enable this option you get stubs for the gettext family of
  1186. functions.
  1187. config UCLIBC_HAS_LOCALE
  1188. bool "Locale Support"
  1189. select UCLIBC_HAS_WCHAR
  1190. select UCLIBC_HAS_CTYPE_TABLES
  1191. select UCLIBC_HAS_LIBICONV
  1192. help
  1193. uClibc now has full ANSI/ISO C99 locale support (except for
  1194. wcsftime() and collating items in regex). Be aware that enabling
  1195. this option will make uClibc much larger.
  1196. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1197. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1198. uClibc by around 300k. You can reduce this size by building your own
  1199. custom set of locate data (see extra/locale/LOCALES for details).
  1200. uClibc's locale support is still under development. For example,
  1201. codesets using shift states are not currently supported. Support is
  1202. planned in the next iteration of locale support.
  1203. Answer Y to enable locale support. Most people will answer N.
  1204. choice
  1205. prompt "Locale data"
  1206. depends on UCLIBC_HAS_LOCALE
  1207. default UCLIBC_BUILD_MINIMAL_LOCALE
  1208. config UCLIBC_BUILD_MINIMAL_LOCALE
  1209. bool "Only selected locales"
  1210. depends on UCLIBC_HAS_LOCALE
  1211. help
  1212. If you do not need all locales that are available on your
  1213. host-box, then set this to 'Y'.
  1214. config UCLIBC_BUILD_ALL_LOCALE
  1215. bool "All locales"
  1216. depends on UCLIBC_HAS_LOCALE
  1217. help
  1218. This builds all the locales that are available on your
  1219. host-box.
  1220. endchoice
  1221. config UCLIBC_BUILD_MINIMAL_LOCALES
  1222. string "locales to use"
  1223. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1224. default "en_US"
  1225. help
  1226. Space separated list of locales to use.
  1227. E.g.:
  1228. en_US en_GB de_AT
  1229. default:
  1230. en_US
  1231. config UCLIBC_HAS_XLOCALE
  1232. bool "Extended Locale Support (experimental/incomplete)"
  1233. depends on UCLIBC_HAS_LOCALE
  1234. help
  1235. Answer Y to enable extended locale support similar to that provided
  1236. by glibc. This is primarily intended to support libstd++
  1237. functionality.
  1238. However, it also allows thread-specific locale selection via
  1239. uselocale().
  1240. Most people will answer N.
  1241. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1242. bool "Support hexadecimal float notation"
  1243. depends on UCLIBC_HAS_CTYPE_TABLES
  1244. depends on UCLIBC_HAS_FLOATS
  1245. help
  1246. Answer Y to enable support for hexadecimal float notation in the
  1247. (wchar and) char string to floating point conversion functions, as
  1248. well as support for the %a and %A conversion specifiers in the
  1249. *printf() and *scanf() functions.
  1250. Most people will answer N.
  1251. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1252. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1253. depends on UCLIBC_HAS_LOCALE
  1254. depends on UCLIBC_HAS_FLOATS
  1255. help
  1256. Answer Y to enable support for glibc's \"'\" flag for allowing
  1257. locale-specific digit grouping in base 10 integer conversions and
  1258. appropriate floating point conversions in the *printf() and *scanf()
  1259. functions.
  1260. Most people will answer N.
  1261. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1262. bool "Do not require digit grouping when the \"'\" flag is specified"
  1263. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1264. default y
  1265. help
  1266. Answer Y to make digit grouping optional when the \"'\" flag is
  1267. specified.
  1268. This is the standard glibc behavior. If the initial string of digits
  1269. exceeds the maximum group number, the input will be treated as a
  1270. normal non-grouped number.
  1271. Most people will answer N.
  1272. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1273. bool "Support glibc's register_printf_function() (glibc-compat)"
  1274. depends on !USE_OLD_VFPRINTF
  1275. help
  1276. Answer Y to support glibc's register_printf_function() to allow an
  1277. application to add its own printf conversion specifiers.
  1278. parse_printf_format() is also enabled.
  1279. NOTE: Limits the number or registered specifiers to 10.
  1280. NOTE: Requires new conversion specifiers to be ASCII
  1281. characters (0-0x7f). This is to avoid problems with processing
  1282. format strings in locales with different multibyte conversions.
  1283. Most people will answer N.
  1284. config USE_OLD_VFPRINTF
  1285. bool "Use the old vfprintf implementation"
  1286. depends on !UCLIBC_HAS_WCHAR
  1287. help
  1288. Set to true to use the old vfprintf instead of the new. This is
  1289. roughly C89 compliant with some extensions, and is much smaller.
  1290. However, it does not support wide chars, positional args, or glibc
  1291. custom printf specifiers.
  1292. Most people will answer N.
  1293. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1294. int "Maximum number of positional args. Either 0 or >= 9."
  1295. depends on !USE_OLD_VFPRINTF
  1296. default 9
  1297. help
  1298. Set the maximum number of positional args supported by the
  1299. printf/scanf functions. The Single Unix Specification Version 3
  1300. requires a minimum value of 9. Setting this to a value lower than
  1301. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1302. in limits.h to be #undef'd.
  1303. WARNING! The workspace to support positional args is currently
  1304. allocated on the stack. You probably don't want to set
  1305. this to too high a value.
  1306. Most people will answer 9.
  1307. choice
  1308. prompt "Stdio buffer size"
  1309. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1310. help
  1311. Please select a value for BUFSIZ. This will be used by the
  1312. stdio subsystem as the default buffer size for a file, and
  1313. affects fopen(), setvbuf(), etc.
  1314. NOTE: Setting this to 'none' will disable buffering completely.
  1315. However, BUFSIZ will still be defined in stdio.h as 256 because
  1316. many applications use this value.
  1317. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1318. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1319. depends on !UCLIBC_HAS_WCHAR
  1320. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1321. bool "256 (minimum ANSI/ISO C99 value)"
  1322. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1323. bool "512"
  1324. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1325. bool "1024"
  1326. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1327. bool "2048"
  1328. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1329. bool "4096"
  1330. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1331. bool "8192"
  1332. # If you add more choices, you will need to update uClibc_stdio.h.
  1333. endchoice
  1334. choice
  1335. prompt "Stdio builtin buffer size (uClibc-specific)"
  1336. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1337. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1338. help
  1339. When a FILE is created with fopen(), an attempt is made to allocate
  1340. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1341. succeed but the FILE will be unbuffered.
  1342. This option adds a small amount of space to each FILE to act as an
  1343. emergency buffer in the event of a buffer allocation failure.
  1344. Most people will answer None.
  1345. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1346. bool "None"
  1347. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1348. bool "4"
  1349. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1350. bool "8"
  1351. # If you add more choices, you will need to update uClibc_stdio.h.
  1352. endchoice
  1353. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1354. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1355. help
  1356. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1357. a behavioral change made in SUSv3. Previously, abort() was required
  1358. to have the affect of fclose() on all open streams. The wording has
  1359. been changed to "may" from "shall".
  1360. Most people will answer N.
  1361. config UCLIBC_HAS_STDIO_GETC_MACRO
  1362. bool "Provide a macro version of getc()"
  1363. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1364. default y
  1365. help
  1366. Provide a macro version of getc().
  1367. Most people will answer Y.
  1368. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1369. bool "Provide a macro version of putc()"
  1370. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1371. default y
  1372. help
  1373. Provide a macro version of putc().
  1374. Most people will answer Y.
  1375. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1376. bool "Support auto-r/w transition"
  1377. default y
  1378. help
  1379. Answer Y to enable the stdio subsystem to automaticly transition
  1380. between reading and writing. This relaxes the ANSI/ISO C99
  1381. requirement:
  1382. When a file is opened with update mode ('+' as the second or third
  1383. character in the list of mode argument values), both input and output
  1384. may be performed on the associated stream. However, output shall not
  1385. be directly followed by input without an intervening call to the
  1386. fflush function or to a file positioning function (fseek, fsetpos,
  1387. or rewind), and input shall not be directly followed by output without
  1388. an intervening call to a file positioning function, unless the input
  1389. operation encounters end­of­file.
  1390. Most people will answer Y.
  1391. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1392. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1393. help
  1394. Answer Y to enable a uClibc-specific extension to allow passing an
  1395. additional 'F' flag in the mode string for fopen() to specify that
  1396. the file should be open()ed with the O_LARGEFILE flag set.
  1397. Most people will answer N.
  1398. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1399. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1400. help
  1401. Answer Y to support a glibc extension to allow passing
  1402. additional 'x' flag in the mode string for fopen() to specify that
  1403. the file should be open()ed with the O_EXCL flag set.
  1404. Most people will answer N.
  1405. config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
  1406. bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
  1407. help
  1408. Answer Y to support a glibc extension to allow passing
  1409. additional 'e' flag in the mode string for fopen() to specify that
  1410. the file should be open()ed with the O_CLOEXEC flag set.
  1411. Most people will answer N.
  1412. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1413. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1414. help
  1415. Answer Y to support the glibc 'custom stream' extension functions
  1416. fmemopen(), open_memstream(), and fopencookie().
  1417. NOTE: There are some minor differences regarding seeking behavior.
  1418. Most people will answer N.
  1419. config UCLIBC_HAS_PRINTF_M_SPEC
  1420. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1421. help
  1422. Answer Y to support a glibc extension to interpret '%m' in printf
  1423. format strings as an instruction to output the error message string
  1424. (as generated by strerror) corresponding to the current value of
  1425. 'errno'.
  1426. Most people will answer N.
  1427. config UCLIBC_HAS_ERRNO_MESSAGES
  1428. bool "Include the errno message text in the library"
  1429. default y
  1430. help
  1431. Answer Y if you want to include the errno message text in the
  1432. library. This adds about 3K to the library, but enables strerror()
  1433. to generate text other than 'Unknown error <number>'.
  1434. Most people will answer Y.
  1435. config UCLIBC_HAS_SYS_ERRLIST
  1436. bool "Support sys_errlist[] (obsolete-compat)"
  1437. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1438. help
  1439. Answer Y if you want to support the obsolete sys_errlist[].
  1440. This adds about 0.5k to the library, except for the mips
  1441. arch where it adds over 4K.
  1442. WARNING! In the future, support for sys_errlist[] may be unavailable
  1443. in at least some configurations. In fact, it may be removed
  1444. altogether.
  1445. Most people will answer N.
  1446. Application writers: use the strerror(3) function.
  1447. config UCLIBC_HAS_SIGNUM_MESSAGES
  1448. bool "Include the signum message text in the library"
  1449. default y
  1450. help
  1451. Answer Y if you want to include the signum message text in the
  1452. library. This adds about 0.5K to the library, but enables strsignal()
  1453. to generate text other than 'Unknown signal <number>'.
  1454. Most people will answer Y.
  1455. config UCLIBC_HAS_SYS_SIGLIST
  1456. bool "Support sys_siglist[] (bsd-compat)"
  1457. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1458. help
  1459. Answer Y if you want to support sys_siglist[].
  1460. WARNING! In the future, support for sys_siglist[] may be unavailable
  1461. in at least some configurations. In fact, it may be removed
  1462. altogether.
  1463. Most people will answer N.
  1464. config UCLIBC_HAS_GNU_GETOPT
  1465. bool "Support gnu getopt"
  1466. default y
  1467. help
  1468. Answer Y if you want to include full gnu getopt() instead of a
  1469. (much smaller) SUSv3 compatible getopt().
  1470. Note that getopt_long, getopt_long_only as well as getsubopt
  1471. are implemented on top of this choice.
  1472. Most people will answer Y.
  1473. config UCLIBC_HAS_GETOPT_LONG
  1474. bool "Support getopt_long/getopt_long_only (glibc-compat)"
  1475. default y
  1476. help
  1477. Answer Y if you want to include getopt_long[_only()] used by many
  1478. apps.
  1479. Most people will answer Y.
  1480. config UCLIBC_HAS_GNU_GETSUBOPT
  1481. bool "Support getsubopt"
  1482. default y
  1483. help
  1484. Answer Y if you want to include getsubopt().
  1485. Most people will answer Y.
  1486. config UCLIBC_HAS_ARGP
  1487. bool "Support argp"
  1488. select UCLIBC_HAS_GETOPT_LONG
  1489. select UCLIBC_HAS_GNU_GETOPT
  1490. select UCLIBC_HAS_WCHAR
  1491. default n
  1492. help
  1493. Argp is an interface for parsing unix-style argument vectors. Unlike
  1494. the common getopt interface, it provides many advanced features in
  1495. addition to parsing options, such as automatic output in response to
  1496. `--help' and `--version' options.
  1497. A library can export an argp option parser, which programs can easily
  1498. use in conjunction with their own option parser.
  1499. Argp support is needed by elfutils libdw.
  1500. Most people can safely answer N.
  1501. endmenu
  1502. menu "Big and Tall"
  1503. config UCLIBC_HAS_REGEX
  1504. bool "Regular Expression Support"
  1505. default y
  1506. help
  1507. POSIX regular expression code is really big -- 53k all by itself.
  1508. If you don't use regular expressions, turn this off and save space.
  1509. Of course, if you only statically link, leave this on, since it will
  1510. only be included in your apps if you use regular expressions.
  1511. config UCLIBC_HAS_FNMATCH
  1512. bool "fnmatch Support"
  1513. default y
  1514. help
  1515. POSIX fnmatch.
  1516. config UCLIBC_HAS_WORDEXP
  1517. bool "Support the wordexp() interface"
  1518. depends on UCLIBC_HAS_GLOB
  1519. help
  1520. The SuSv3 wordexp() interface performs word expansions per the Shell
  1521. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1522. intended for use by applications that want to implement all of the
  1523. standard Bourne shell expansions on input data.
  1524. This interface is rarely used, and very large. Unless you have a
  1525. pressing need for wordexp(), you should probably answer N.
  1526. config UCLIBC_HAS_NFTW
  1527. bool "Support the nftw() interface"
  1528. help
  1529. The SuSv3 nftw() 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 nftw(), you should probably answer N.
  1533. config UCLIBC_HAS_FTW
  1534. bool "Support the ftw() interface (SUSv4-obsolete)"
  1535. depends on UCLIBC_SUSV4_LEGACY
  1536. help
  1537. The SuSv3 ftw() interface is used to recursively descend
  1538. directory paths while repeatedly calling a function.
  1539. This interface is rarely used, and adds around 4.5k. Unless you have
  1540. a pressing need for ftw(), you should probably answer N.
  1541. config UCLIBC_HAS_FTS
  1542. bool "Support the fts() interface (bsd-compat)"
  1543. help
  1544. The fts functions are provided for traversing UNIX file hierarchies.
  1545. This interface is currently used by the elfutils and adds
  1546. around 7.5k.
  1547. You should port your application to use the POSIX nftw()
  1548. interface.
  1549. Unless you need to build/use elfutils, you should prolly answer N.
  1550. config UCLIBC_HAS_GLOB
  1551. bool "Support the glob() interface"
  1552. depends on UCLIBC_HAS_FNMATCH
  1553. default y
  1554. help
  1555. The glob interface is somewhat large (weighing in at about 2,5k). It
  1556. is used fairly often, but is an option since people wanting to go for
  1557. absolute minimum size may wish to omit it.
  1558. Most people will answer Y.
  1559. config UCLIBC_HAS_GNU_GLOB
  1560. bool "Support gnu glob() interface"
  1561. depends on UCLIBC_HAS_GLOB
  1562. help
  1563. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1564. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1565. from glibc and does not support all the GNU specific options.
  1566. Answer Y if you want to include full gnu glob() instead of the smaller
  1567. SUSv3 compatible glob().
  1568. Most people will answer N.
  1569. endmenu
  1570. menu "Library Installation Options"
  1571. config RUNTIME_PREFIX
  1572. string "uClibc runtime library directory"
  1573. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1574. help
  1575. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1576. libraries will be installed. The result will look something
  1577. like the following:
  1578. $(RUNTIME_PREFIX)/
  1579. lib/ <contains all runtime libraries>
  1580. usr/bin/ldd <the ldd utility program>
  1581. sbin/ldconfig <the ldconfig utility program>
  1582. This value is used by the 'make install' Makefile target. Since this
  1583. directory is compiled into the shared library loader, you will need to
  1584. recompile uClibc if you change this value...
  1585. For a typical target system this should be set to "/", such that
  1586. 'make install' will install /lib/libuClibc-<VERSION>.so
  1587. config DEVEL_PREFIX
  1588. string "uClibc development environment directory"
  1589. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1590. help
  1591. DEVEL_PREFIX is the directory into which the uClibc development
  1592. environment will be installed. The result will look something
  1593. like the following:
  1594. $(DEVEL_PREFIX)/
  1595. lib/ <contains static libs>
  1596. include/ <Where all the header files go>
  1597. This value is used by the 'make install' Makefile target when
  1598. installing a uClibc development environment.
  1599. For a typical target system this should be set to "/usr", such that
  1600. 'make install' will install /usr/include/<header files>.
  1601. config MULTILIB_DIR
  1602. string "library path component"
  1603. default "lib"
  1604. help
  1605. Path component where libraries reside.
  1606. For a typical target system this should be set to "lib", such that
  1607. 'make install' will install libraries to "/lib" and "/usr/lib"
  1608. respectively
  1609. DEVEL_PREFIX/MULTILIB_DIR
  1610. RUNTIME_PREFIX/MULTILIB_DIR
  1611. Other settings may include "lib32" or "lib64".
  1612. config HARDWIRED_ABSPATH
  1613. bool "Hardwire absolute paths into linker scripts"
  1614. default y
  1615. help
  1616. This prepends absolute paths to the libraries mentioned in linker
  1617. scripts such as libc.so.
  1618. This is a build time optimization. It has no impact on dynamic
  1619. linking at runtime, which doesn't use linker scripts.
  1620. You must disable this to use uClibc with old non-sysroot toolchains,
  1621. such as the prebuilt binary cross compilers at:
  1622. http://uclibc.org/downloads/binaries
  1623. The amount of time saved by this optimization is actually too small to
  1624. measure. The linker just had to search the library path to find the
  1625. linker script, so the dentries are cache hot if it has to search the
  1626. same path again. But it's what glibc does, so we do it too.
  1627. endmenu
  1628. menu "Security options"
  1629. config UCLIBC_BUILD_PIE
  1630. bool "Build utilities as ET_DYN/PIE executables"
  1631. depends on HAVE_SHARED
  1632. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_nds32
  1633. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1634. help
  1635. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1636. executables.
  1637. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1638. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1639. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1640. all libraries have to be built with -fPIC or -fpic, and all
  1641. assembler functions must be written as position independent
  1642. code (PIC).
  1643. config HAVE_NO_SSP
  1644. bool
  1645. config UCLIBC_HAS_SSP
  1646. bool "Support for GCC stack smashing protector"
  1647. depends on !HAVE_NO_SSP
  1648. help
  1649. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1650. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1651. the needed functions are added to ldso/libc instead.
  1652. GCC's stack protector is a reimplementation of IBM's propolice.
  1653. See http://www.trl.ibm.com/projects/security/ssp/ and
  1654. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1655. for details.
  1656. Note that NOEXECSTACK on a kernel with address space randomization
  1657. is generally sufficient to prevent most buffer overflow exploits
  1658. without increasing code size. This option essentially adds debugging
  1659. code to catch them.
  1660. Most people will answer N.
  1661. config SSP_QUICK_CANARY
  1662. bool "Use simple guard values without accessing /dev/urandom"
  1663. depends on UCLIBC_HAS_SSP
  1664. help
  1665. Use gettimeofday(2) to define the __guard without accessing
  1666. /dev/urandom.
  1667. WARNING: This makes smashing stack protector vulnerable to timing
  1668. attacks.
  1669. Most people will answer N.
  1670. choice
  1671. prompt "Propolice protection blocking signal"
  1672. depends on UCLIBC_HAS_SSP
  1673. depends on DODEBUG
  1674. default PROPOLICE_BLOCK_SEGV
  1675. help
  1676. "abort" use SIGABRT to block offending programs.
  1677. This is the default implementation.
  1678. "segfault" use SIGSEGV to block offending programs.
  1679. Use this for debugging.
  1680. If unsure, answer "abort".
  1681. config PROPOLICE_BLOCK_ABRT
  1682. bool "abort"
  1683. config PROPOLICE_BLOCK_SEGV
  1684. bool "segfault"
  1685. endchoice
  1686. config UCLIBC_BUILD_SSP
  1687. bool "Build uClibc with -fstack-protector"
  1688. depends on UCLIBC_HAS_SSP
  1689. help
  1690. Build all uClibc libraries and executables with -fstack-protector,
  1691. adding extra stack overflow checking to most uClibc functions.
  1692. config UCLIBC_BUILD_RELRO
  1693. bool "Build uClibc with linker option -z RELRO"
  1694. depends on HAVE_SHARED
  1695. default y
  1696. help
  1697. Build all libraries and executables with "ld -z relro".
  1698. This tells the linker to mark chunks of an executable or shared
  1699. library read-only after applying dynamic relocations. (This comes
  1700. up when a global const variable is initialized to the address of a
  1701. function or the value of another global variable.)
  1702. This is a fairly obscure option the ld man page doesn't even bother
  1703. to document properly. It's a security paranoia issue that's more
  1704. likely to consume memory (by allocating an extra page) rather than
  1705. save it.
  1706. This is explained in more depth at
  1707. http://www.airs.com/blog/archives/189
  1708. Nobody is likely to care whether you say Y or N here.
  1709. config UCLIBC_BUILD_NOW
  1710. bool "Build uClibc with linker option -z NOW"
  1711. depends on HAVE_SHARED
  1712. help
  1713. Build all libraries and executables with "ld -z now".
  1714. This tells the linker to resolve all symbols when the library is
  1715. first loaded, rather than when each function is first called. This
  1716. increases start-up latency by a few microseconds and may do
  1717. unnecessary work (resolving symbols that are never used), but the
  1718. realtime people like it for making microbenchmark timings slightly
  1719. more predictable and in some cases it can be slightly faster due to
  1720. CPU cache behavior (not having to fault the linker back in to do
  1721. lazy symbol resolution).
  1722. Most people can't tell the difference between selecting Y or N here.
  1723. config UCLIBC_BUILD_NOEXECSTACK
  1724. bool "Build uClibc with noexecstack marking"
  1725. default y
  1726. help
  1727. Mark all assembler files as noexecstack, which will mark uClibc
  1728. as not requiring an executable stack. (This doesn't prevent other
  1729. files you link against from claiming to need an executable stack, it
  1730. just won't cause uClibc to request it unnecessarily.)
  1731. This is a security thing to make buffer overflows harder to exploit.
  1732. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1733. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1734. It only actually provides any security when combined with address
  1735. space randomization, explained here: http://lwn.net/Articles/121845/
  1736. Address space randomization is on by default in current linux
  1737. kernels (although it can be disabled using the option
  1738. CONFIG_COMPAT_BRK).
  1739. You should probably say Y.
  1740. endmenu
  1741. menu "Development/debugging options"
  1742. config CROSS_COMPILER_PREFIX
  1743. string "Cross-compiling toolchain prefix"
  1744. default ""
  1745. help
  1746. The prefix used to execute your cross-compiling toolchain. For
  1747. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1748. then enter 'arm-linux-uclibc-' here.
  1749. config UCLIBC_EXTRA_CFLAGS
  1750. string "Extra CFLAGS"
  1751. default ""
  1752. help
  1753. Add any additional CFLAGS to be used to build uClibc.
  1754. config DODEBUG
  1755. bool "Enable debugging symbols"
  1756. select EXTRA_WARNINGS
  1757. help
  1758. Say Y here if you wish to compile uClibc with debugging symbols.
  1759. This will allow you to use a debugger to examine uClibc internals
  1760. while applications are running. This increases the size of the
  1761. library considerably and should only be used when doing development.
  1762. If you are doing development and want to debug uClibc, answer Y.
  1763. Otherwise, answer N.
  1764. config DODEBUG_PT
  1765. bool "Build pthread with debugging output"
  1766. depends on UCLIBC_HAS_THREADS && UCLIBC_HAS_LINUXTHREADS
  1767. help
  1768. Enable debug output in libpthread. This is only useful when doing
  1769. development in libpthread itself.
  1770. Otherwise, answer N.
  1771. config DOSTRIP
  1772. bool "Strip libraries and executables"
  1773. default y
  1774. depends on !DODEBUG
  1775. help
  1776. Say Y here if you do wish to strip all uClibc libraries and
  1777. executables. No stripping increases the size of the binaries
  1778. considerably, but makes it possible to debug uClibc libraries.
  1779. Most people will answer Y.
  1780. config DOASSERTS
  1781. bool "Build with run-time assertion testing"
  1782. help
  1783. Say Y here to include runtime assertion tests.
  1784. This enables runtime assertion testing in some code, which can
  1785. increase the size of the library and incur runtime overhead.
  1786. If you say N, then this testing will be disabled.
  1787. config SUPPORT_LD_DEBUG
  1788. bool "Build the shared library loader with debugging support"
  1789. depends on HAVE_SHARED
  1790. help
  1791. Answer Y here to enable all the extra code needed to debug the uClibc
  1792. native shared library loader. The level of debugging noise that is
  1793. generated depends on the LD_DEBUG environment variable... Just set
  1794. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1795. debug your application. Diagnostic messages will then be printed to
  1796. the stderr.
  1797. For now these debugging tokens are available:
  1798. detail provide more information for some options
  1799. move display copy processing
  1800. symbols display symbol table processing
  1801. reloc display relocation processing; detail shows the
  1802. relocation patch
  1803. nofixups never fixes up jump relocations
  1804. bindings displays the resolve processing (function calls);
  1805. detail shows the relocation patch
  1806. all Enable everything!
  1807. The additional environment variable:
  1808. LD_DEBUG_OUTPUT=file
  1809. redirects the diagnostics to an output file created using
  1810. the specified name and the process id as a suffix.
  1811. An excellent start is simply:
  1812. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1813. or to log everything to a file named 'logfile', try this
  1814. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1815. If you are doing development and want to debug uClibc's shared library
  1816. loader, answer Y. Mere mortals answer N.
  1817. config SUPPORT_LD_DEBUG_EARLY
  1818. bool "Build the shared library loader with early debugging support"
  1819. depends on HAVE_SHARED
  1820. help
  1821. Answer Y here to if you find the uClibc shared library loader is
  1822. crashing or otherwise not working very early on. This is typical
  1823. only when starting a new port when you haven't figured out how to
  1824. properly get the values for argc, argv, environ, etc. This method
  1825. allows a degree of visibility into the very early shared library
  1826. loader initialization process. If you are doing development and want
  1827. to debug the uClibc shared library loader early initialization,
  1828. answer Y. Mere mortals answer N.
  1829. config UCLIBC_MALLOC_DEBUGGING
  1830. bool "Build malloc with debugging support"
  1831. depends on MALLOC || MALLOC_STANDARD
  1832. select DOASSERTS
  1833. help
  1834. Answer Y here to compile extra debugging support code into malloc.
  1835. Malloc debugging output may then be enabled at runtime using the
  1836. MALLOC_DEBUG environment variable.
  1837. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1838. as a bitmask with the following bits:
  1839. 1 - do extra consistency checking
  1840. 2 - output messages for malloc/free calls and OS
  1841. allocation calls
  1842. 4 - output messages for the `MMB' layer
  1843. 8 - output messages for internal malloc heap manipulation
  1844. calls
  1845. Because this increases the size of malloc appreciably (due to strings
  1846. etc), you should say N unless you need to debug a malloc problem.
  1847. config UCLIBC_HAS_BACKTRACE
  1848. bool "Add support for application self-debugging"
  1849. depends on HAVE_SHARED
  1850. help
  1851. Answer Y here to compile support for application self-debugging that
  1852. provides the following new functions:
  1853. backtrace, backtrace_symbols, backtrace_symbols_fd
  1854. The backtrace functionality is currently supported on some platforms, and it
  1855. based on dwarf2 informations to properly work, so any application that
  1856. want to use backtrace needs to be built with -fexceptions flag.
  1857. The symbol names may be unavailable without the use of special linker
  1858. options. For systems using the GNU linker, it is necessary to use the
  1859. -rdynamic linker option too. Note that names of "static" functions are not
  1860. exposed, and won't be available in the backtrace.
  1861. config WARNINGS
  1862. string "Compiler Warnings"
  1863. default "-Wall"
  1864. help
  1865. Set this to the set of compiler warnings you wish to see while compiling.
  1866. config EXTRA_WARNINGS
  1867. bool "Enable extra annoying warnings"
  1868. help
  1869. If you wish to build with extra warnings enabled, say Y here.
  1870. endmenu