Config.in 74 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see extra/config/Kconfig-language.txt
  4. #
  5. mainmenu "uClibc-ng $VERSION C Library Configuration"
  6. config DESIRED_TARGET_ARCH
  7. string
  8. option env="ARCH"
  9. config VERSION
  10. string
  11. option env="VERSION"
  12. choice
  13. prompt "Target Architecture"
  14. default TARGET_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_kvx if DESIRED_TARGET_ARCH = "kvx"
  28. default TARGET_lm32 if DESIRED_TARGET_ARCH = "lm32"
  29. default TARGET_m68k if DESIRED_TARGET_ARCH = "m68k"
  30. default TARGET_metag if DESIRED_TARGET_ARCH = "metag"
  31. default TARGET_microblaze if DESIRED_TARGET_ARCH = "microblaze"
  32. default TARGET_mips if DESIRED_TARGET_ARCH = "mips"
  33. default TARGET_nds32 if DESIRED_TARGET_ARCH = "nds32"
  34. default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
  35. default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
  36. default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
  37. default TARGET_riscv64 if DESIRED_TARGET_ARCH = "riscv64"
  38. default TARGET_riscv32 if DESIRED_TARGET_ARCH = "riscv32"
  39. default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
  40. default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
  41. default TARGET_sparc64 if DESIRED_TARGET_ARCH = "sparc64"
  42. default TARGET_tile if DESIRED_TARGET_ARCH = "tile"
  43. default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
  44. default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
  45. help
  46. The architecture of your target.
  47. config TARGET_aarch64
  48. bool "aarch64"
  49. config TARGET_alpha
  50. bool "alpha"
  51. config TARGET_arc
  52. bool "arc"
  53. config TARGET_arm
  54. bool "arm"
  55. config TARGET_avr32
  56. bool "avr32"
  57. config TARGET_bfin
  58. bool "bfin"
  59. # someone could sync this tree:
  60. # http://linux-c6x.org/git/?p=uClibc.git;a=summary
  61. config TARGET_c6x
  62. bool "c6x"
  63. config TARGET_cris
  64. bool "cris"
  65. config TARGET_csky
  66. bool "csky"
  67. config TARGET_frv
  68. bool "frv"
  69. config TARGET_h8300
  70. bool "h8300"
  71. config TARGET_hppa
  72. bool "hppa"
  73. config TARGET_i386
  74. bool "i386"
  75. config TARGET_ia64
  76. bool "ia64"
  77. config TARGET_kvx
  78. bool "kvx"
  79. config TARGET_lm32
  80. bool "lm32"
  81. config TARGET_m68k
  82. bool "m68k"
  83. config TARGET_metag
  84. bool "metag"
  85. config TARGET_microblaze
  86. bool "microblaze"
  87. config TARGET_mips
  88. bool "mips"
  89. config TARGET_nds32
  90. bool "nds32"
  91. config TARGET_nios2
  92. bool "nios2"
  93. config TARGET_or1k
  94. bool "or1k"
  95. config TARGET_powerpc
  96. bool "powerpc"
  97. config TARGET_riscv64
  98. bool "riscv64"
  99. config TARGET_riscv32
  100. bool "riscv32"
  101. config TARGET_sh
  102. bool "superh"
  103. config TARGET_sparc
  104. bool "sparc"
  105. config TARGET_sparc64
  106. bool "sparc64"
  107. config TARGET_tile
  108. bool "tile"
  109. config TARGET_x86_64
  110. bool "x86_64"
  111. config TARGET_xtensa
  112. bool "xtensa"
  113. endchoice
  114. config TARGET_LDSO_NAME
  115. string
  116. default "ld64-uClibc" if TARGET_ia64
  117. default "ld64-uClibc" if TARGET_powerpc64
  118. default "ld64-uClibc" if TARGET_sparc64
  119. default "ld64-uClibc" if TARGET_x86_64
  120. default "ld64-uClibc" if TARGET_kvx
  121. default "ld64-uClibc" if CONFIG_MIPS_N64_ABI
  122. default "ld-uClibc"
  123. config TARGET_ARCH_BITS
  124. int
  125. default 64 if TARGET_aarch64
  126. default 64 if TARGET_ia64
  127. default 64 if TARGET_powerpc64
  128. default 64 if TARGET_riscv64
  129. default 64 if TARGET_sparc64
  130. default 64 if TARGET_x86_64
  131. default 64 if TARGET_kvx
  132. default 64 if CONFIG_MIPS_N64_ABI
  133. default 32
  134. menu "Target Architecture Features and Options"
  135. if TARGET_aarch64
  136. source "extra/Configs/Config.aarch64"
  137. endif
  138. if TARGET_alpha
  139. source "extra/Configs/Config.alpha"
  140. endif
  141. if TARGET_arm
  142. source "extra/Configs/Config.arm"
  143. endif
  144. if TARGET_avr32
  145. source "extra/Configs/Config.avr32"
  146. endif
  147. if TARGET_bfin
  148. source "extra/Configs/Config.bfin"
  149. endif
  150. if TARGET_cris
  151. source "extra/Configs/Config.cris"
  152. endif
  153. if TARGET_csky
  154. source "extra/Configs/Config.csky"
  155. endif
  156. if TARGET_frv
  157. source "extra/Configs/Config.frv"
  158. endif
  159. if TARGET_h8300
  160. source "extra/Configs/Config.h8300"
  161. endif
  162. if TARGET_hppa
  163. source "extra/Configs/Config.hppa"
  164. endif
  165. if TARGET_i386
  166. source "extra/Configs/Config.i386"
  167. endif
  168. if TARGET_ia64
  169. source "extra/Configs/Config.ia64"
  170. endif
  171. if TARGET_kvx
  172. source "extra/Configs/Config.kvx"
  173. endif
  174. if TARGET_lm32
  175. source "extra/Configs/Config.lm32"
  176. endif
  177. if TARGET_m68k
  178. source "extra/Configs/Config.m68k"
  179. endif
  180. if TARGET_metag
  181. source "extra/Configs/Config.metag"
  182. endif
  183. if TARGET_nds32
  184. source "extra/Configs/Config.nds32"
  185. endif
  186. if TARGET_nios2
  187. source "extra/Configs/Config.nios2"
  188. endif
  189. if TARGET_microblaze
  190. source "extra/Configs/Config.microblaze"
  191. endif
  192. if TARGET_mips
  193. source "extra/Configs/Config.mips"
  194. endif
  195. if TARGET_or1k
  196. source "extra/Configs/Config.or1k"
  197. endif
  198. if TARGET_powerpc
  199. source "extra/Configs/Config.powerpc"
  200. endif
  201. if TARGET_riscv64
  202. source "extra/Configs/Config.riscv64"
  203. endif
  204. if TARGET_riscv32
  205. source "extra/Configs/Config.riscv32"
  206. endif
  207. if TARGET_sh
  208. source "extra/Configs/Config.sh"
  209. endif
  210. if TARGET_sparc
  211. source "extra/Configs/Config.sparc"
  212. endif
  213. if TARGET_sparc64
  214. source "extra/Configs/Config.sparc64"
  215. endif
  216. if TARGET_tile
  217. source "extra/Configs/Config.tile"
  218. endif
  219. if TARGET_x86_64
  220. source "extra/Configs/Config.x86_64"
  221. endif
  222. if TARGET_xtensa
  223. source "extra/Configs/Config.xtensa"
  224. endif
  225. if TARGET_c6x
  226. source "extra/Configs/Config.c6x"
  227. endif
  228. if TARGET_arc
  229. source "extra/Configs/Config.arc"
  230. endif
  231. config TARGET_SUBARCH
  232. string
  233. default "e500" if CONFIG_E500
  234. default "classic" if CONFIG_CLASSIC
  235. default "sh4" if CONFIG_SH4
  236. default "sh4" if CONFIG_SH4A
  237. default "" if CONFIG_386
  238. default "i486" if CONFIG_486
  239. default "i586" if CONFIG_586
  240. default "i686" if CONFIG_686
  241. default ""
  242. source "extra/Configs/Config.in.arch"
  243. endmenu
  244. menu "General Library Settings"
  245. config HAVE_NO_PIC
  246. bool
  247. config DOPIC
  248. bool "Generate only Position Independent Code (PIC)"
  249. default y
  250. depends on !HAVE_NO_PIC
  251. help
  252. If you wish to build all of uClibc as PIC objects, then answer Y here.
  253. If you are unsure, then you should answer N.
  254. config STATIC_PIE
  255. bool "Add support for Static Position Independent Executables (PIE)"
  256. default n
  257. depends on DOPIC && !UCLIBC_FORMAT_FDPIC_ELF && \
  258. (TARGET_aarch64 || TARGET_arm || TARGET_i386 || \
  259. TARGET_m68k || TARGET_mips || TARGET_powerpc || \
  260. TARGET_riscv32 || TARGET_riscv64 || TARGET_x86_64 \
  261. || TARGET_xtensa)
  262. config ARCH_HAS_NO_SHARED
  263. bool
  264. config ARCH_HAS_NO_LDSO
  265. bool
  266. select ARCH_HAS_NO_SHARED
  267. config ARCH_HAS_UCONTEXT
  268. bool
  269. config HAVE_LDSO
  270. bool
  271. config HAVE_SHARED
  272. bool "Enable shared libraries"
  273. depends on !ARCH_HAS_NO_SHARED
  274. select HAVE_LDSO
  275. default y
  276. help
  277. If you wish to build uClibc with support for shared libraries then
  278. answer Y here. If you only want to build uClibc as a static library,
  279. then answer N.
  280. config FORCE_SHAREABLE_TEXT_SEGMENTS
  281. bool "Only load shared libraries which can share their text segment"
  282. depends on HAVE_SHARED
  283. select DOPIC
  284. help
  285. If you answer Y here, the uClibc native shared library loader will
  286. only load shared libraries, which do not need to modify any
  287. non-writable segments. These libraries haven't set the DT_TEXTREL
  288. tag in the dynamic section (==> objdump).
  289. All your libraries must be compiled with -fPIC or -fpic, and all
  290. assembler function must be written as position independent code (PIC).
  291. Enabling this option will make uClibc's shared library loader a
  292. little bit smaller and guarantee that no memory will be wasted by
  293. badly coded shared libraries.
  294. config LDSO_LDD_SUPPORT
  295. bool "Native 'ldd' support"
  296. depends on HAVE_SHARED
  297. default y
  298. help
  299. Enable all the code needed to support traditional ldd,
  300. which executes the shared library loader to resolve all dependencies
  301. and then provide a list of shared libraries that are required for an
  302. application to function. Disabling this option will make uClibc's
  303. shared library loader a little bit smaller.
  304. Most people will answer Y.
  305. config LDSO_CACHE_SUPPORT
  306. bool "Enable library loader cache (ld.so.conf)"
  307. depends on HAVE_SHARED
  308. default y
  309. help
  310. Enable this to make use of /etc/ld.so.conf, the shared library loader
  311. cache configuration file to support for non-standard library paths.
  312. After updating this file, it is necessary to run 'ldconfig' to update
  313. the /etc/ld.so.cache shared library loader cache file.
  314. config LDSO_PRELOAD_ENV_SUPPORT
  315. bool "Enable library loader LD_PRELOAD environment"
  316. depends on HAVE_SHARED
  317. default y
  318. help
  319. Enable this to make use of LD_PRELOAD environment variable.
  320. A whitespace-separated list of additional, user-specified, ELF shared
  321. libraries to be loaded before all others. This can be used to
  322. selectively override functions in other shared libraries. For
  323. set-user-ID/set-group-ID ELF binaries, only libraries in the standard
  324. search directories that are also set-user-ID will be loaded.
  325. config LDSO_PRELOAD_FILE_SUPPORT
  326. bool "Enable library loader preload file (ld.so.preload)"
  327. depends on HAVE_SHARED
  328. help
  329. Enable this to make use of /etc/ld.so.preload. This file contains a
  330. whitespace separated list of shared libraries to be loaded before
  331. the program.
  332. config LDSO_BASE_FILENAME
  333. string "Shared library loader naming prefix"
  334. depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
  335. default "ld.so"
  336. help
  337. If you wish to support both uClibc and glibc on the same system, it
  338. is necessary to set this to something other than "ld.so" to avoid
  339. conflicts with glibc, which also uses "ld.so". This prevents both
  340. libraries from using the same /etc/ld.so.* files. If you wish to
  341. support both uClibc and glibc on the same system then you should set
  342. this to "ld-uClibc.so".
  343. Most people will leave this set to the default of "ld.so".
  344. WARNING: Changing the default prefix could cause problems with
  345. binutils' ld !
  346. config LDSO_STANDALONE_SUPPORT
  347. bool "Dynamic linker stand-alone mode support"
  348. depends on HAVE_SHARED
  349. help
  350. The dynamic linker can be run either indirectly through running some
  351. dynamically linked program or library (in which case no command line
  352. options to the dynamic linker can be passed and, in the ELF case, the
  353. dynamic linker which is stored in the .interp section of the program
  354. is executed) or directly by running:
  355. /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
  356. Stand-alone execution is a prerequisite for adding prelink
  357. capabilities to uClibc dynamic linker, as well useful for testing an
  358. updated version of the dynamic linker without breaking the system.
  359. config LDSO_PRELINK_SUPPORT
  360. bool "Dynamic linker prelink support"
  361. depends on HAVE_SHARED
  362. select LDSO_STANDALONE_SUPPORT
  363. help
  364. The dynamic linker can be used in stand-alone mode by the prelink tool
  365. for prelinking ELF shared libraries and binaries to speed up startup
  366. time. It also is able to load and handle prelinked libraries and
  367. binaries at runtime.
  368. config ARCH_VDSO_SUPPORT
  369. bool
  370. config VDSO_SUPPORT
  371. bool "Dynamic linker vDSO support"
  372. depends on ARCH_VDSO_SUPPORT
  373. help
  374. Enable this option to support vDSO loading
  375. vDSO provides access to some kernel function without a systemcall
  376. if provided by the kernel
  377. most archs support gettimeofday() and clock_gettime()
  378. vDSO loading can be disabled via VDSO_DISABLE environment variable
  379. config UCLIBC_STATIC_LDCONFIG
  380. bool "Link ldconfig statically"
  381. depends on HAVE_SHARED
  382. default y
  383. help
  384. Enable this option to statically link the ldconfig binary.
  385. Making ldconfig static can be beneficial if you have a library
  386. problem and need to use ldconfig to recover. Sometimes it is
  387. preferable to instead keep the size of the system down, in which
  388. case you should disable this option.
  389. config LDSO_RUNPATH
  390. bool "Enable ELF RUNPATH tag support"
  391. depends on HAVE_SHARED
  392. default y if LDSO_CACHE_SUPPORT
  393. help
  394. ELF's may have dynamic RPATH/RUNPATH tags. These tags list paths
  395. which extend the library search paths. They are really only useful
  396. if a package installs libraries in non standard locations and
  397. ld.so.conf support is disabled.
  398. Usage of RUNPATH tags is not too common, so disabling this feature
  399. should be safe for most people.
  400. config LDSO_RUNPATH_OF_EXECUTABLE
  401. bool "Use executables RUNPATH/RPATH when searching for libraries."
  402. depends on LDSO_RUNPATH
  403. default n
  404. help
  405. Use the executables RUNPATH/RPATH to find to find libraries even
  406. though this behavour is not standard. Setting this option causes
  407. the uclibc dynamic linker behavour to match the glibc dynamic linker.
  408. config LDSO_SAFE_RUNPATH
  409. bool "Allow only RUNPATH beginning with /"
  410. depends on LDSO_RUNPATH
  411. default y
  412. help
  413. Allow only absolute path in RPATH/RUNPATH.
  414. config LDSO_SEARCH_INTERP_PATH
  415. bool "Add ldso path to lib search path"
  416. depends on HAVE_SHARED
  417. default y
  418. help
  419. The ldso is told where it is being executed from and can use that
  420. path to find related core libraries. This is useful by default,
  421. but can be annoying in a mixed development environment.
  422. i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
  423. library search with /foo/boo/
  424. If unsure, simply say Y here.
  425. config LDSO_LD_LIBRARY_PATH
  426. bool "Add LD_LIBRARY_PATH to lib search path"
  427. depends on HAVE_SHARED
  428. default y
  429. help
  430. On hardened system it could be useful to disable the use of
  431. LD_LIBRARY_PATH environment variable (a colon-separated list of
  432. directories in which to search for ELF libraries at execution-time).
  433. If unsure, simply say Y here.
  434. config UCLIBC_CTOR_DTOR
  435. bool "Support global constructors and destructors"
  436. default y
  437. help
  438. If you wish to build uClibc with support for global constructor
  439. (ctor) and global destructor (dtor) support, then answer Y here.
  440. When ctor/dtor support is enabled, binaries linked with uClibc must
  441. also be linked with crtbegin.o and crtend.o which are provided by gcc
  442. (the "*startfile:" and "*endfile:" settings in your gcc specs file
  443. may need to be adjusted to include these files). This support will
  444. also add a small amount of additional size to each binary compiled vs
  445. uClibc. If you will be using uClibc with C++, or if you need the gcc
  446. __attribute__((constructor)) and __attribute__((destructor)) to work,
  447. then you definitely want to answer Y here. If you don't need ctors
  448. or dtors and want your binaries to be as small as possible, then
  449. answer N.
  450. config LDSO_GNU_HASH_SUPPORT
  451. bool "Enable GNU hash style support"
  452. depends on HAVE_SHARED && !TARGET_mips
  453. help
  454. Newest binutils support a new hash style named GNU-hash. The dynamic
  455. linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
  456. if present into the ELF binaries, otherwise it will use the old SysV
  457. hash style (.hash). This ensures that it is completely backward
  458. compatible.
  459. Further, being the hash table implementation self-contained into each
  460. executable and shared libraries, objects with mixed hash style can
  461. peacefully coexist in the same process.
  462. If you want to use this new feature, answer Y
  463. choice
  464. prompt "Thread support"
  465. default HAS_NO_THREADS
  466. help
  467. If you want to compile uClibc with pthread support, then answer Y.
  468. This will increase the size of uClibc by adding a bunch of locking
  469. to critical data structures, and adding extra code to ensure that
  470. functions are properly reentrant.
  471. config HAS_NO_THREADS
  472. bool "none"
  473. help
  474. Disable thread support.
  475. config UCLIBC_HAS_LINUXTHREADS
  476. bool "Linuxthreads"
  477. # linuxthreads need nanosleep()
  478. select UCLIBC_HAS_REALTIME
  479. depends on !TARGET_aarch64 && \
  480. !TARGET_metag
  481. help
  482. If you want to compile uClibc with Linuxthreads support, then answer Y.
  483. config UCLIBC_HAS_THREADS_NATIVE
  484. bool "Native POSIX Threading (NPTL)"
  485. select UCLIBC_HAS_TLS
  486. select UCLIBC_HAS_STDIO_FUTEXES
  487. select UCLIBC_HAS_REALTIME
  488. # i386 has no lowlevellock support (yet) as opposed to i486 onward
  489. depends on !CONFIG_386 && \
  490. !TARGET_alpha && \
  491. !TARGET_avr32 && \
  492. !TARGET_bfin && \
  493. !TARGET_c6x && \
  494. !TARGET_cris && \
  495. !TARGET_frv && \
  496. !TARGET_h8300 && \
  497. !TARGET_hppa && \
  498. !TARGET_ia64 && \
  499. (ARCH_USE_MMU || TARGET_arm || TARGET_xtensa)
  500. help
  501. If you want to compile uClibc with NPTL support, then answer Y.
  502. endchoice
  503. config UCLIBC_HAS_THREADS
  504. def_bool y if !HAS_NO_THREADS
  505. config UCLIBC_HAS_TLS
  506. bool "Thread-Local Storage"
  507. depends on UCLIBC_HAS_THREADS_NATIVE
  508. help
  509. If you want to enable TLS support then answer Y.
  510. This is fast an efficient way to store per-thread local data
  511. which is not on stack. It needs __thread support enabled in
  512. gcc.
  513. config PTHREADS_DEBUG_SUPPORT
  514. bool "Build pthreads debugging support"
  515. depends on UCLIBC_HAS_THREADS
  516. help
  517. Say Y here if you wish to be able to debug applications that use
  518. uClibc's pthreads library. By enabling this option, a library
  519. named libthread_db will be built. This library will be dlopen()'d
  520. by gdb and will allow gdb to debug the threads in your application.
  521. IMPORTANT NOTE! Because gdb must dlopen() the libthread_db library,
  522. you must compile gdb with uClibc in order for pthread debugging to
  523. work properly.
  524. If you are doing development and want to debug applications using
  525. uClibc's pthread library, answer Y. Otherwise, answer N.
  526. config PTHREADS_STACK_DEFAULT_SIZE
  527. int "Default thread stack size"
  528. default 4194304 if TARGET_alpha # 4 MiB
  529. default 4194304 if TARGET_powerpc # 4 MiB
  530. default 2097152 # 2 MiB
  531. help
  532. Set the default thread stack size. This option is useful on MMU-less
  533. systems where the stack size is fixed and the default stack size may
  534. be excessively large and waste memory.
  535. config UCLIBC_HAS_SYSLOG
  536. bool "Syslog support"
  537. default y
  538. depends on UCLIBC_HAS_NETWORK_SUPPORT
  539. select UCLIBC_HAS_SOCKET
  540. help
  541. Support sending messages to the system logger.
  542. This requires socket-support.
  543. config UCLIBC_HAS_LFS
  544. def_bool y
  545. help
  546. Large file support (always enabled; config symbol retained for
  547. feature test to be compatible with uClibc).
  548. choice
  549. prompt "Malloc Implementation"
  550. default MALLOC if ! ARCH_USE_MMU
  551. default MALLOC_STANDARD if ARCH_USE_MMU
  552. config MALLOC
  553. bool "malloc"
  554. help
  555. "malloc" use mmap for all allocations and so works very well on
  556. MMU-less systems that do not support the brk() system call. It is
  557. pretty smart about reusing already allocated memory, and minimizing
  558. memory wastage.
  559. This is the default for uClinux MMU-less systems.
  560. config MALLOC_SIMPLE
  561. bool "malloc-simple"
  562. help
  563. "malloc-simple" is trivially simple and slow as molasses. It
  564. was written from scratch for uClibc, and is the simplest possible
  565. (and therefore smallest) malloc implementation.
  566. This uses only the mmap() system call to allocate and free memory,
  567. and does not use the brk() system call at all, making it a fine
  568. choice for MMU-less systems with very limited memory. It's 100%
  569. standards compliant, thread safe, very small, and releases freed
  570. memory back to the OS immediately rather than keeping it in the
  571. process's heap for reallocation. It is also VERY SLOW.
  572. config MALLOC_STANDARD
  573. bool "malloc-standard"
  574. depends on ARCH_USE_MMU
  575. help
  576. "malloc-standard" is derived from the public domain dlmalloc
  577. implementation by Doug Lea. It is quite fast, and is pretty smart
  578. about reusing already allocated memory, and minimizing memory
  579. wastage. This uses brk() for small allocations, while using mmap()
  580. for larger allocations. This is the default malloc implementation
  581. for uClibc.
  582. If unsure, answer "malloc-standard".
  583. endchoice
  584. config UCLIBC_DYNAMIC_ATEXIT
  585. bool "Dynamic atexit() Support"
  586. default y
  587. help
  588. When this option is enabled, uClibc will support an infinite number,
  589. of atexit() and on_exit() functions, limited only by your available
  590. memory. This can be important when uClibc is used with C++, since
  591. global destructors are implemented via atexit(), and it is quite
  592. possible to exceed the default number when this option is disabled.
  593. Enabling this option adds a few bytes, and more significantly makes
  594. atexit and on_exit depend on malloc, which can be bad when compiling
  595. static executables.
  596. Unless you use uClibc with C++, you should probably answer N.
  597. config UCLIBC_HAS_UTMPX
  598. bool "utmpx based support for tracking login/logouts to/from the system"
  599. help
  600. Answer y to enable support for accessing user accounting database.
  601. It can be used to track all login/logout to the system.
  602. config UCLIBC_HAS_UTMP
  603. bool "utmp support (XPG2 compat, SVr4 compat)"
  604. depends on UCLIBC_HAS_UTMPX
  605. help
  606. Answer y to enable legacy SVID support for accessing
  607. user accounting database:
  608. getutent(), getutid(), getutline(), pututline(),
  609. setutent(), endutent(), utmpname() in utmp.h
  610. It can be used to track all login/logout to the system.
  611. If unsure, answer N and use corresponding POSIX functions
  612. from utmpx.h
  613. config UCLIBC_SUSV2_LEGACY
  614. bool "Enable SuSv2 LEGACY functions"
  615. help
  616. Enable this option if you want to have SuSv2 LEGACY functions
  617. Currently applies to:
  618. valloc
  619. WARNING! ABI incompatibility.
  620. config UCLIBC_SUSV3_LEGACY
  621. bool "Enable SuSv3 LEGACY functions"
  622. #vfork,
  623. # h_errno
  624. # gethostbyaddr
  625. # gethostbyname
  626. help
  627. Enable this option if you want to have SuSv3 LEGACY functions
  628. in the library, else they are replaced by SuSv3 proposed macros.
  629. Currently applies to:
  630. bcmp, bcopy, bzero, index, rindex, ftime,
  631. bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
  632. (getwd), (makecontext),
  633. mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
  634. scalb, (setcontext), (swapcontext), ualarm, usleep,
  635. wcswcs.
  636. WARNING! ABI incompatibility.
  637. config UCLIBC_HAS_CONTEXT_FUNCS
  638. bool "Use obsolescent context control functions"
  639. depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
  640. help
  641. Add into library the SuSv3 obsolescent functions used for context
  642. control. The setcontext family allows the implementation in C of
  643. advanced control flow patterns such as iterators, fibers, and
  644. coroutines. They may be viewed as an advanced version of
  645. setjmp/longjmp; whereas the latter allows only a single non-local jump
  646. up the stack, setcontext allows the creation of multiple cooperative
  647. threads of control, each with its own stack.
  648. These functions are: setcontext, getcontext, makecontext, swapcontext.
  649. config UCLIBC_SUSV3_LEGACY_MACROS
  650. bool "Enable SuSv3 LEGACY macros"
  651. help
  652. Enable this option if you want to have SuSv3 LEGACY macros.
  653. Currently applies to bcopy/bzero/bcmp/index/rindex et al.
  654. WARNING! ABI incompatibility.
  655. config UCLIBC_SUSV4_LEGACY
  656. bool "Enable SuSv4 LEGACY or obsolescent functions"
  657. help
  658. Enable this option if you want to have SuSv4 LEGACY functions
  659. and macros in the library.
  660. Currently applies to:
  661. - XSI functions:
  662. _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
  663. gettimeofday, isascii, pthread_getconcurrency,
  664. pthread_setconcurrency, setitimer, setpgrp, sighold,
  665. sigignore, sigpause, sigrelse, sigset, siginterrupt,
  666. tempnam, toascii, ulimit.
  667. - Base functions:
  668. asctime, asctime_r, ctime, ctime_r, gets, rand_r,
  669. tmpnam, utime.
  670. WARNING! ABI incompatibility.
  671. config UCLIBC_STRICT_HEADERS
  672. bool "Hide structures and constants for unsupported features"
  673. help
  674. Hide structures and constants in headers that should not be used,
  675. because the respective feature is disabled.
  676. WARNING! enabling this option requires to patch many faulty apps,
  677. since they make (wrongly) use of these structures/constants,
  678. although the feature was disabled.
  679. config UCLIBC_HAS_STUBS
  680. bool "Provide stubs for unavailable functionality"
  681. help
  682. With this option uClibc provides non-functional stubs for
  683. functions which are impossible to implement on the target
  684. architecture. Otherwise, such functions are simply omitted.
  685. config UCLIBC_HAS_SHADOW
  686. bool "Shadow Password Support"
  687. default y
  688. help
  689. Answer N if you do not need shadow password support.
  690. Most people will answer Y.
  691. config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
  692. bool "Support for program_invocation_name"
  693. help
  694. Support for the GNU-specific program_invocation_name and
  695. program_invocation_short_name strings. Some GNU packages
  696. (like tar and coreutils) utilize these for extra useful
  697. output, but in general are not required.
  698. At startup, these external strings are automatically set
  699. up based on the value of ARGV[0].
  700. If unsure, just answer N.
  701. config UCLIBC_HAS___PROGNAME
  702. bool "Support for __progname"
  703. default y
  704. help
  705. Some packages (like openssh) like to peek into internal libc
  706. symbols to make their output a bit more user friendly.
  707. At startup, __progname is automatically set up based on the
  708. value of ARGV[0].
  709. If unsure, just answer N.
  710. config UCLIBC_HAS_PTY
  711. bool "Support for pseudo-terminals"
  712. default y
  713. help
  714. This enables support for pseudo-terminals (see man 4 pts
  715. and man 7 pty).
  716. If unsure, just answer Y.
  717. config ASSUME_DEVPTS
  718. bool "Assume that /dev/pts is a devpts or devfs file system"
  719. default y
  720. depends on UCLIBC_HAS_PTY
  721. help
  722. Enable this if /dev/pts is on a devpts or devfs filesystem. Both
  723. these filesystems automatically manage permissions on the /dev/pts
  724. devices. You may need to mount your devpts or devfs filesystem on
  725. /dev/pts for this to work.
  726. Most people should answer Y.
  727. config UNIX98PTY_ONLY
  728. bool "Support only Unix 98 PTYs"
  729. default y
  730. depends on UCLIBC_HAS_PTY
  731. help
  732. If you want to support only Unix 98 PTYs enable this. Some older
  733. applications may need this disabled and will thus use legacy BSD
  734. style PTY handling which is more complex and also bigger than
  735. Unix 98 PTY handling.
  736. For most current programs, you can generally answer Y.
  737. if UNIX98PTY_ONLY
  738. config UCLIBC_HAS_GETPT
  739. bool "Support getpt() (glibc-compat)"
  740. depends on UCLIBC_HAS_PTY
  741. help
  742. Some packages may need getpt().
  743. All of those are non-standard and can be considered
  744. GNU/libc compatibility.
  745. Either use posix_openpt() or just open /dev/ptmx yourself.
  746. If unsure, just say N.
  747. endif
  748. if !UNIX98PTY_ONLY
  749. # Have to use __libc_ptyname{1,2}[] and related bloat
  750. config UCLIBC_HAS_GETPT
  751. def_bool y
  752. endif
  753. config UCLIBC_HAS_LIBUTIL
  754. bool "Provide libutil library and functions"
  755. depends on UCLIBC_HAS_PTY
  756. help
  757. Provide a libutil library.
  758. This non-standard conforming library provides the following
  759. utility functions:
  760. forkpty(): combines openpty(), fork(2), and login_tty() to
  761. create a new process operating in a pseudo-terminal.
  762. login(): write utmp and wtmp entries
  763. login_tty(): prepares for a login on the tty fd by creating a
  764. new session, making fd the controlling terminal for
  765. the calling process, setting fd to be the standard
  766. input, output, and error streams of the current
  767. process, and closing fd.
  768. logout(): write utmp and wtmp entries
  769. logwtmp(): constructs a utmp structure and calls updwtmp() to
  770. append the structure to the utmp file.
  771. openpty(): finds an available pseudo-terminal and returns
  772. file descriptors for the master and slave
  773. This library adds about 3k-4k to your system.
  774. config UCLIBC_HAS_TM_EXTENSIONS
  775. bool "Support 'struct tm' timezone extension fields"
  776. default y
  777. help
  778. Enabling this option adds fields to 'struct tm' in time.h for
  779. tracking the number of seconds east of UTC, and an abbreviation for
  780. the current timezone. These fields are not specified by the SuSv3
  781. standard, but they are commonly used in both GNU and BSD application
  782. code.
  783. To strictly follow the SuSv3 standard, leave this disabled.
  784. Most people will probably want to answer Y.
  785. config UCLIBC_HAS_TZ_CACHING
  786. bool "Enable caching of the last valid timezone 'TZ' string"
  787. default y
  788. help
  789. Answer Y to enable caching of the last valid 'TZ' string describing
  790. the timezone setting. This allows a quick string compare to avoid
  791. repeated parsing of unchanged 'TZ' strings when tzset() is called.
  792. Most people will answer Y.
  793. config UCLIBC_HAS_TZ_FILE
  794. bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
  795. default y
  796. help
  797. Answer Y to enable the setting of a default timezone for uClibc.
  798. Ordinarily, uClibc gets the timezone information exclusively from the
  799. 'TZ' environment variable. In particular, there is no support for
  800. the zoneinfo directory tree or the /etc/timezone file used by glibc.
  801. With this option enabled, uClibc will use the value stored in the
  802. file '/etc/TZ' (default path) to obtain timezone information if the
  803. 'TZ' environment variable is missing or has an invalid value. The
  804. file consists of a single line (newline required) of text describing
  805. the timezone in the format specified for the TZ environment variable.
  806. Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
  807. See
  808. http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
  809. for details on valid settings of 'TZ'.
  810. Most people will answer Y.
  811. config UCLIBC_HAS_TZ_FILE_READ_MANY
  812. bool "Repeatedly read the '/etc/TZ' file"
  813. depends on UCLIBC_HAS_TZ_FILE
  814. default y
  815. help
  816. Answer Y to enable repeated reading of the '/etc/TZ' file even after
  817. a valid value has been read. This incurs the overhead of an
  818. open/read/close for each tzset() call (explicit or implied). However,
  819. setting this will allow applications to update their timezone
  820. information if the contents of the file change.
  821. Most people will answer Y.
  822. config UCLIBC_TZ_FILE_PATH
  823. string "Path to the 'TZ' file for setting the global timezone"
  824. depends on UCLIBC_HAS_TZ_FILE
  825. default "/etc/TZ"
  826. help
  827. This is the path to the 'TZ' file.
  828. Most people will use the default of '/etc/TZ'.
  829. config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
  830. bool "Use /etc/localtime as a fallback"
  831. depends on UCLIBC_HAS_TZ_FILE
  832. default y
  833. help
  834. Answer Y to try to use /etc/localtime file.
  835. On glibc systems this file (if it is in TZif2 format)
  836. contains timezone string at the end.
  837. Most people will answer Y.
  838. config UCLIBC_USE_TIME64
  839. bool "Use *time64 syscalls instead of 32bit ones (if possible)"
  840. depends on TARGET_arc || \
  841. TARGET_arm || \
  842. TARGET_csky || \
  843. TARGET_i386 || \
  844. TARGET_m68k || \
  845. TARGET_microblaze || \
  846. (TARGET_mips && !CONFIG_MIPS_N64_ABI) || \
  847. TARGET_or1k || \
  848. TARGET_powerpc || \
  849. TARGET_riscv32 || \
  850. TARGET_sparc || \
  851. TARGET_sh || \
  852. TARGET_xtensa
  853. # TODO: add support for other architectures
  854. default y
  855. help
  856. Replace 32bit syscalls to their 64/time64 analog if possible.
  857. endmenu
  858. menu "Advanced Library Settings"
  859. config UCLIBC_PWD_BUFFER_SIZE
  860. int "Buffer size for getpwnam() and friends"
  861. default 256
  862. range 12 1024
  863. help
  864. This sets the value of the buffer size for getpwnam() and friends.
  865. By default, this is 256. (For reference, glibc uses 1024).
  866. The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
  867. parameter.
  868. config UCLIBC_GRP_BUFFER_SIZE
  869. int "Buffer size for getgrnam() and friends"
  870. default 256
  871. range 12 1024
  872. help
  873. This sets the value of the buffer size for getgrnam() and friends.
  874. By default, this is 256. (For reference, glibc uses 1024).
  875. The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
  876. parameter.
  877. comment "Support various families of functions"
  878. config UCLIBC_LINUX_SPECIFIC
  879. bool "Linux specific functions"
  880. default y
  881. help
  882. accept4(), bdflush(),
  883. capget(), capset(), eventfd(), fallocate(),
  884. fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
  885. madvise(), modify_ldt(), pipe2(), personality(),
  886. prctl()/arch_prctl(), pivot_root(), modify_ldt(),
  887. ppoll(), readahead(), reboot(), remap_file_pages(),
  888. sched_getaffinity(), sched_setaffinity(), sendfile(),
  889. setfsgid(), setfsuid(), setresgid(), setresuid(),
  890. splice(), vmsplice(), tee(), signalfd(), statfs(),
  891. swapoff(), swapon(), sync_file_range(), syncfs(),
  892. _sysctl(), sysinfo(), timerfd_*(), vhangup(), umount(),
  893. umount2()
  894. config UCLIBC_HAS_GNU_ERROR
  895. bool "Support GNU extensions for error-reporting"
  896. default y
  897. help
  898. Support for the GNU-specific error(), error_at_line(),
  899. void (* error_print_progname)(), error_message_count
  900. functions and variables. Some GNU packages
  901. utilize these for extra useful output, but in general
  902. are not required.
  903. If unsure, just answer N.
  904. config UCLIBC_BSD_SPECIFIC
  905. bool "BSD specific functions"
  906. default y
  907. help
  908. mincore(), getdomainname(), setdomainname()
  909. If unsure, say N.
  910. config UCLIBC_HAS_BSD_ERR
  911. bool "BSD err functions"
  912. default y
  913. help
  914. These functions are non-standard BSD extensions.
  915. err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()
  916. If unsure, say N.
  917. config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
  918. bool "BSD obsolete signal functions"
  919. help
  920. These functions are provided as a compatibility interface for
  921. programs that make use of the historical System V signal API.
  922. This API is obsolete:
  923. new applications should use the POSIX signal API (sigaction(2),
  924. sigprocmask(2), etc.).
  925. Affected functions:
  926. sigset(), sighold(), sigrelse(), sigignore()
  927. If unsure, say N.
  928. config UCLIBC_HAS_BSD_B64_NTOP_B64_PTON
  929. bool "Support b64_ntop(), b64_pton() (bsd-compat)"
  930. help
  931. Answer Y if you need additional BSD compatibility
  932. (e.g. for openbsd-netcat).
  933. Most people will say N.
  934. config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
  935. bool "SYSV obsolete signal functions"
  936. help
  937. Use of sysv_signal() should be avoided; use sigaction(2) instead.
  938. If unsure, say N.
  939. config UCLIBC_NTP_LEGACY
  940. bool "ntp_*() aliases"
  941. help
  942. Provide legacy aliases for ntp functions:
  943. ntp_adjtime(), ntp_gettime()
  944. It is safe to say N here.
  945. config UCLIBC_SV4_DEPRECATED
  946. bool "Enable SVr4 deprecated functions"
  947. help
  948. These functions are DEPRECATED in System V release 4.
  949. Say N unless you desparately need one of the functions below:
  950. ustat() [use statfs(2) in your code instead]
  951. config UCLIBC_HAS_REALTIME
  952. bool "Realtime-related family of SUSv functions"
  953. default y
  954. help
  955. These functions are part of the Timers option and need not
  956. be available on all implementations.
  957. Includes AIO, message-queue, scheduler, semaphore functions:
  958. aio.h
  959. mqueue.h
  960. sched.h
  961. semaphore.h
  962. aio_cancel()
  963. aio_error()
  964. aio_fsync()
  965. aio_read()
  966. lio_listio()
  967. aio_return()
  968. aio_suspend()
  969. aio_write()
  970. clock_getres(), clock_gettime(), clock_settime()
  971. fdatasync()
  972. mlockall(), munlockall()
  973. mlock(), munlock()
  974. mq_close()
  975. mq_getattr()
  976. mq_notify()
  977. mq_open()
  978. mq_receive()
  979. mq_send()
  980. mq_setattr()
  981. mq_unlink()
  982. nanosleep()
  983. sched_getparam()
  984. sched_get_priority_max(), sched_get_priority_min()
  985. sched_getscheduler()
  986. sched_rr_get_interval()
  987. sched_setparam()
  988. sched_setscheduler()
  989. sem_close()
  990. sem_destroy()
  991. sem_getvalue()
  992. sem_init()
  993. sem_open()
  994. sem_post()
  995. sem_trywait(), sem_wait()
  996. sem_unlink()
  997. sigqueue()
  998. sigtimedwait(), sigwaitinfo()
  999. timer_create()
  1000. timer_delete()
  1001. timer_getoverrun(), timer_gettime(), timer_settime()
  1002. config UCLIBC_HAS_ADVANCED_REALTIME
  1003. bool "Advanced realtime-related family of SUSv functions"
  1004. default y
  1005. depends on UCLIBC_HAS_REALTIME
  1006. help
  1007. These functions are part of the Timers option and need not
  1008. be available on all implementations.
  1009. clock_getcpuclockid()
  1010. clock_nanosleep()
  1011. mq_timedreceive()
  1012. mq_timedsend()
  1013. posix_fadvise()
  1014. posix_fallocate()
  1015. posix_madvise()
  1016. posix_memalign()
  1017. posix_mem_offset()
  1018. posix_spawnattr_destroy(), posix_spawnattr_init()
  1019. posix_spawnattr_getflags(), posix_spawnattr_setflags()
  1020. posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
  1021. posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
  1022. posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
  1023. posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
  1024. posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
  1025. posix_spawn_file_actions_addclose()
  1026. posix_spawn_file_actions_adddup2()
  1027. posix_spawn_file_actions_addopen()
  1028. posix_spawn_file_actions_destroy()
  1029. posix_spawn_file_actions_init()
  1030. posix_spawn()
  1031. posix_spawnp()
  1032. posix_typed_mem_get_info()
  1033. pthread_mutex_timedlock()
  1034. sem_timedwait()
  1035. #config UCLIBC_HAS_TERMIOS
  1036. # bool "termios functions"
  1037. # default y
  1038. # help
  1039. # Get and set terminal attributes, line control, get and set baud
  1040. # rate.
  1041. # termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
  1042. # tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
  1043. # cfsetispeed(), cfsetospeed(), cfsetspeed()
  1044. #
  1045. # If unsure, say Y.
  1046. config UCLIBC_HAS_EPOLL
  1047. bool "epoll"
  1048. default y
  1049. help
  1050. epoll_create(), epoll_ctl(), epoll_wait() functions.
  1051. config UCLIBC_HAS_XATTR
  1052. bool "Extended Attributes"
  1053. default y
  1054. help
  1055. Extended Attributes support.
  1056. setxattr()
  1057. lsetxattr()
  1058. fsetxattr()
  1059. getxattr()
  1060. lgetxattr()
  1061. fgetxattr()
  1062. listxattr()
  1063. llistxattr()
  1064. flistxattr()
  1065. removexattr()
  1066. lremovexattr()
  1067. fremovexattr()
  1068. Say N unless you need support for extended attributes and the
  1069. filesystems do actually support them.
  1070. config UCLIBC_HAS_PROFILING
  1071. bool "Profiling support"
  1072. default y
  1073. help
  1074. gcc's -finstrument-functions needs these.
  1075. Most people can safely answer N.
  1076. config UCLIBC_HAS_CRYPT_IMPL
  1077. bool "libcrypt support"
  1078. default y
  1079. help
  1080. libcrypt contains crypt(), setkey() and encrypt()
  1081. config UCLIBC_HAS_SHA256_CRYPT_IMPL
  1082. bool "libcrypt SHA256 support"
  1083. depends on UCLIBC_HAS_CRYPT_IMPL
  1084. help
  1085. This adds support for SHA256 password hashing via the crypt() function.
  1086. Say N here if you do not need SHA256 crypt support.
  1087. config UCLIBC_HAS_SHA512_CRYPT_IMPL
  1088. bool "libcrypt SHA512 support"
  1089. depends on UCLIBC_HAS_CRYPT_IMPL
  1090. help
  1091. This adds support for SHA512 password hashing via the crypt() function.
  1092. Say N here if you do not need SHA512 crypt support.
  1093. config UCLIBC_HAS_CRYPT_STUB
  1094. bool "libcrypt stubs"
  1095. default y
  1096. depends on !UCLIBC_HAS_CRYPT_IMPL
  1097. help
  1098. Standards mandate that crypt(3) provides a stub if it is unavailable.
  1099. If you enable this option then stubs for
  1100. crypt(), setkey() and encrypt()
  1101. will be provided in a small libcrypt.
  1102. config UCLIBC_HAS_CRYPT
  1103. def_bool y
  1104. depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
  1105. endmenu
  1106. menuconfig UCLIBC_HAS_NETWORK_SUPPORT
  1107. bool "Networking Support"
  1108. default y
  1109. help
  1110. Say N here if you do not need network support.
  1111. if UCLIBC_HAS_NETWORK_SUPPORT
  1112. config UCLIBC_HAS_SOCKET
  1113. bool "Socket support"
  1114. default y
  1115. help
  1116. If you want to include support for sockets then answer Y.
  1117. config UCLIBC_HAS_IPV4
  1118. bool "IP version 4 support"
  1119. default y
  1120. select UCLIBC_HAS_SOCKET
  1121. help
  1122. If you want to include support for the Internet Protocol
  1123. (IP version 4) then answer Y.
  1124. Most people will say Y.
  1125. config UCLIBC_HAS_IPV6
  1126. bool "IP version 6 support"
  1127. select UCLIBC_HAS_SOCKET
  1128. help
  1129. If you want to include support for the next version of the Internet
  1130. Protocol (IP version 6) then answer Y.
  1131. Most people should answer N.
  1132. config UCLIBC_USE_NETLINK
  1133. bool "Use netlink to query interfaces"
  1134. depends on UCLIBC_HAS_SOCKET
  1135. help
  1136. In newer versions of Linux (2.4.17+), support was added for querying
  1137. network device information via netlink rather than the old style
  1138. ioctl's. Most of the time, the older ioctl style is sufficient (and
  1139. it is smaller than netlink), but if you find that not all of your
  1140. devices are being returned by the if_nameindex() function, you will
  1141. have to use the netlink implementation.
  1142. Most people can safely answer N.
  1143. config UCLIBC_SUPPORT_AI_ADDRCONFIG
  1144. bool "Support the AI_ADDRCONFIG flag"
  1145. depends on UCLIBC_USE_NETLINK
  1146. help
  1147. The implementation of AI_ADDRCONFIG is aligned with the glibc
  1148. implementation using netlink to query interfaces to find both
  1149. ipv4 and ipv6 support. This is only needed if an application uses
  1150. the AI_ADDRCONFIG flag.
  1151. Most people can safely answer N.
  1152. config UCLIBC_HAS_BSD_RES_CLOSE
  1153. bool "Support res_close() (bsd-compat)"
  1154. help
  1155. Answer Y if you desperately want to support BSD compatibility in
  1156. the network code.
  1157. Most people will say N.
  1158. config UCLIBC_HAS_COMPAT_RES_STATE
  1159. bool "Use compatible but bloated _res"
  1160. default y
  1161. help
  1162. Answer Y if you build network utilities and they muck with resolver
  1163. internals a lot (_res global structure). uclibc does not use most
  1164. of _res.XXX fields, and with this option OFF they won't even exist.
  1165. Which will make e.g. dig build fail.
  1166. Answering N saves around 400 bytes in bss.
  1167. config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
  1168. bool "Use extra compatible but extra bloated _res"
  1169. help
  1170. Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
  1171. As far as I can say, this should never be needed.
  1172. config UCLIBC_HAS_RESOLVER_SUPPORT
  1173. bool "DNS resolver functions"
  1174. select UCLIBC_HAS_COMPAT_RES_STATE
  1175. depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
  1176. help
  1177. Provide implementations for DNS resolver functions.
  1178. In particular, the following functions will be added to the
  1179. library:
  1180. ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
  1181. res_mkquery, res_init, res_ninit, res_close, res_nclose
  1182. res_query, res_search, res_querydomain,
  1183. dn_expand, dn_comp,
  1184. ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
  1185. ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
  1186. ns_get16, ns_get32, ns_put16, ns_put32
  1187. choice
  1188. prompt "DNS Query ID generation"
  1189. default UCLIBC_DNSRAND_MODE_PRNGPLUS
  1190. help
  1191. Control how successive dns query ids' are generated during
  1192. dns lookup.
  1193. config UCLIBC_DNSRAND_MODE_URANDOM
  1194. bool "urandom"
  1195. help
  1196. "urandom" uses /dev/urandom available under many unix flavours
  1197. to generate dns query id. This can generate good random ids,
  1198. by dipping into the entropy pool maintained by the system.
  1199. However this is relatively slow compared to the other options,
  1200. as it may involve cryptographic operations internally and
  1201. kernel-userspace handshake.
  1202. config UCLIBC_DNSRAND_MODE_CLOCK
  1203. bool "clock"
  1204. depends on UCLIBC_HAS_REALTIME
  1205. help
  1206. "clock" uses CLOCK_REALTIME of the system to generate plausibly
  1207. random dns query id. Systems require to have clock source with
  1208. nanosec granularity mapped to this clock id for this to generate
  1209. plausibly random values. However has processor and io performances
  1210. improve in future, its effectiveness can get impacted.
  1211. config UCLIBC_DNSRAND_MODE_PRNGPLUS
  1212. bool "prngplus"
  1213. help
  1214. "prngplus" uses random prng available within uclibc, to indirectly
  1215. generate the dns query id. This tries to provide a good balance
  1216. between speed and randomness to an extent. It periodically reseeds
  1217. the prng using random value generated from either the urandom or
  1218. else the clock, if either of them is available. Additionally applies
  1219. transform (one way, if possible) on internal generated random values.
  1220. These make it difficult to infer internal state of prng from unbroken
  1221. sequences of exposed random values.
  1222. This is the default.
  1223. config UCLIBC_DNSRAND_MODE_SIMPLECOUNTER
  1224. bool "simplecounter"
  1225. help
  1226. "simplecounter" uses a simple counter to generate dns query id.
  1227. This is a very simple logic and can be subjected to dns poison
  1228. attack relatively easily.
  1229. It is recommended to avoid this option.
  1230. endchoice
  1231. endif
  1232. menu "String and Stdio Support"
  1233. config UCLIBC_HAS_STRING_GENERIC_OPT
  1234. bool "Use faster (but larger) generic string functions"
  1235. default y
  1236. help
  1237. Answer Y to use the (tweaked) glibc generic string functions.
  1238. In general, they are faster (but 3-5K larger) than the base
  1239. uClibc string functions which are optimized solely for size.
  1240. Many people will answer Y.
  1241. config UCLIBC_HAS_STRING_ARCH_OPT
  1242. bool "Use arch-specific assembly string functions (where available)"
  1243. default y
  1244. help
  1245. Answer Y to use any archtecture-specific assembly language string
  1246. functions available for this target plaform.
  1247. Note that assembly implementations are not available for all string
  1248. functions, so some generic (written in C) string functions may
  1249. still be used.
  1250. These are small and fast, the only reason _not_ to say Y here is
  1251. for debugging purposes.
  1252. config UCLIBC_HAS_STDIO_FUTEXES
  1253. bool "Use futexes for multithreaded I/O locking"
  1254. depends on UCLIBC_HAS_THREADS_NATIVE
  1255. help
  1256. If you want to compile uClibc to use futexes for low-level
  1257. I/O locking, answer Y. Otherwise, answer N.
  1258. config UCLIBC_HAS_CTYPE_TABLES
  1259. bool "Use Table Versions Of 'ctype.h' Functions."
  1260. default y
  1261. help
  1262. Answer Y to use table versions of the 'ctype.h' functions.
  1263. While the non-table versions are often smaller when building
  1264. statically linked apps, they work only in stub locale mode.
  1265. Most people will answer Y.
  1266. config UCLIBC_HAS_CTYPE_SIGNED
  1267. bool "Support Signed Characters In 'ctype.h' Functions."
  1268. depends on UCLIBC_HAS_CTYPE_TABLES
  1269. default y
  1270. help
  1271. Answer Y to enable support for passing signed char values to
  1272. the 'ctype.h' functions. ANSI/ISO C99 and SUSv3 specify that
  1273. these functions are only defined for unsigned char values and
  1274. EOF. However, glibc allows negative signed char values as well
  1275. in order to support 'broken old programs'.
  1276. Most people will answer Y.
  1277. choice
  1278. prompt "ctype argument checking"
  1279. depends on UCLIBC_HAS_CTYPE_TABLES
  1280. default UCLIBC_HAS_CTYPE_UNSAFE
  1281. help
  1282. Please select the invalid arg behavior you want for the 'ctype'
  1283. functions.
  1284. The 'ctype' functions are now implemented using table lookups, with
  1285. the arg being the index. This can result in incorrect memory accesses
  1286. or even segfaults for args outside of the allowed range.
  1287. NOTE: This only affects the 'ctype' _functions_. It does not affect
  1288. the macro implementations.
  1289. config UCLIBC_HAS_CTYPE_UNSAFE
  1290. bool "Do not check -- unsafe"
  1291. config UCLIBC_HAS_CTYPE_CHECKED
  1292. bool "Detect and handle appropriately"
  1293. config UCLIBC_HAS_CTYPE_ENFORCED
  1294. bool "Issue a diagnostic and abort()"
  1295. endchoice
  1296. config UCLIBC_HAS_WCHAR
  1297. bool "Wide Character Support"
  1298. help
  1299. Answer Y to enable wide character support. This will make uClibc
  1300. much larger. It is also currently required for locale support.
  1301. Most people will answer N.
  1302. config UCLIBC_HAS_LIBICONV
  1303. bool "Iconv Support"
  1304. select UCLIBC_HAS_WCHAR
  1305. help
  1306. Add tiny iconv support for charset conversion from and to UTF-8.
  1307. config UCLIBC_HAS_LIBINTL
  1308. bool "Intl stubs support"
  1309. help
  1310. If you enable this option you get stubs for the gettext family of
  1311. functions.
  1312. config UCLIBC_HAS_LOCALE
  1313. bool "Locale Support"
  1314. select UCLIBC_HAS_WCHAR
  1315. select UCLIBC_HAS_CTYPE_TABLES
  1316. select UCLIBC_HAS_LIBICONV
  1317. help
  1318. uClibc now has full ANSI/ISO C99 locale support (except for
  1319. wcsftime() and collating items in regex). Be aware that enabling
  1320. this option will make uClibc much larger.
  1321. Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
  1322. (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
  1323. uClibc by around 300k. You can reduce this size by building your own
  1324. custom set of locate data (see extra/locale/LOCALES for details).
  1325. uClibc's locale support is still under development. For example,
  1326. codesets using shift states are not currently supported. Support is
  1327. planned in the next iteration of locale support.
  1328. Answer Y to enable locale support. Most people will answer N.
  1329. choice
  1330. prompt "Locale data"
  1331. depends on UCLIBC_HAS_LOCALE
  1332. default UCLIBC_BUILD_MINIMAL_LOCALE
  1333. config UCLIBC_BUILD_MINIMAL_LOCALE
  1334. bool "Only selected locales"
  1335. depends on UCLIBC_HAS_LOCALE
  1336. help
  1337. If you do not need all locales that are available on your
  1338. host-box, then set this to 'Y'.
  1339. config UCLIBC_BUILD_ALL_LOCALE
  1340. bool "All locales"
  1341. depends on UCLIBC_HAS_LOCALE
  1342. help
  1343. This builds all the locales that are available on your
  1344. host-box.
  1345. endchoice
  1346. config UCLIBC_BUILD_MINIMAL_LOCALES
  1347. string "locales to use"
  1348. depends on UCLIBC_BUILD_MINIMAL_LOCALE
  1349. default "en_US"
  1350. help
  1351. Space separated list of locales to use.
  1352. E.g.:
  1353. en_US en_GB de_AT
  1354. default:
  1355. en_US
  1356. config UCLIBC_HAS_XLOCALE
  1357. bool "Extended Locale Support (experimental/incomplete)"
  1358. depends on UCLIBC_HAS_LOCALE
  1359. help
  1360. Answer Y to enable extended locale support similar to that provided
  1361. by glibc. This is primarily intended to support libstd++
  1362. functionality.
  1363. However, it also allows thread-specific locale selection via
  1364. uselocale().
  1365. Most people will answer N.
  1366. config UCLIBC_HAS_HEXADECIMAL_FLOATS
  1367. bool "Support hexadecimal float notation"
  1368. depends on UCLIBC_HAS_CTYPE_TABLES
  1369. depends on UCLIBC_HAS_FLOATS
  1370. help
  1371. Answer Y to enable support for hexadecimal float notation in the
  1372. (wchar and) char string to floating point conversion functions, as
  1373. well as support for the %a and %A conversion specifiers in the
  1374. *printf() and *scanf() functions.
  1375. Most people will answer N.
  1376. config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1377. bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
  1378. depends on UCLIBC_HAS_LOCALE
  1379. depends on UCLIBC_HAS_FLOATS
  1380. help
  1381. Answer Y to enable support for glibc's \"'\" flag for allowing
  1382. locale-specific digit grouping in base 10 integer conversions and
  1383. appropriate floating point conversions in the *printf() and *scanf()
  1384. functions.
  1385. Most people will answer N.
  1386. config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
  1387. bool "Do not require digit grouping when the \"'\" flag is specified"
  1388. depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
  1389. default y
  1390. help
  1391. Answer Y to make digit grouping optional when the \"'\" flag is
  1392. specified.
  1393. This is the standard glibc behavior. If the initial string of digits
  1394. exceeds the maximum group number, the input will be treated as a
  1395. normal non-grouped number.
  1396. Most people will answer N.
  1397. config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
  1398. bool "Support glibc's register_printf_function() (glibc-compat)"
  1399. depends on !USE_OLD_VFPRINTF
  1400. help
  1401. Answer Y to support glibc's register_printf_function() to allow an
  1402. application to add its own printf conversion specifiers.
  1403. parse_printf_format() is also enabled.
  1404. NOTE: Limits the number or registered specifiers to 10.
  1405. NOTE: Requires new conversion specifiers to be ASCII
  1406. characters (0-0x7f). This is to avoid problems with processing
  1407. format strings in locales with different multibyte conversions.
  1408. Most people will answer N.
  1409. config USE_OLD_VFPRINTF
  1410. bool "Use the old vfprintf implementation"
  1411. depends on !UCLIBC_HAS_WCHAR
  1412. help
  1413. Set to true to use the old vfprintf instead of the new. This is
  1414. roughly C89 compliant with some extensions, and is much smaller.
  1415. However, it does not support wide chars, positional args, or glibc
  1416. custom printf specifiers.
  1417. Most people will answer N.
  1418. config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
  1419. int "Maximum number of positional args. Either 0 or >= 9."
  1420. depends on !USE_OLD_VFPRINTF
  1421. default 9
  1422. help
  1423. Set the maximum number of positional args supported by the
  1424. printf/scanf functions. The Single Unix Specification Version 3
  1425. requires a minimum value of 9. Setting this to a value lower than
  1426. 9 will disable positional arg support and cause the NL_ARGMAX macro
  1427. in limits.h to be #undef'd.
  1428. WARNING! The workspace to support positional args is currently
  1429. allocated on the stack. You probably don't want to set
  1430. this to too high a value.
  1431. Most people will answer 9.
  1432. choice
  1433. prompt "Stdio buffer size"
  1434. default UCLIBC_HAS_STDIO_BUFSIZ_4096
  1435. help
  1436. Please select a value for BUFSIZ. This will be used by the
  1437. stdio subsystem as the default buffer size for a file, and
  1438. affects fopen(), setvbuf(), etc.
  1439. NOTE: Setting this to 'none' will disable buffering completely.
  1440. However, BUFSIZ will still be defined in stdio.h as 256 because
  1441. many applications use this value.
  1442. config UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1443. bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
  1444. depends on !UCLIBC_HAS_WCHAR
  1445. config UCLIBC_HAS_STDIO_BUFSIZ_256
  1446. bool "256 (minimum ANSI/ISO C99 value)"
  1447. config UCLIBC_HAS_STDIO_BUFSIZ_512
  1448. bool "512"
  1449. config UCLIBC_HAS_STDIO_BUFSIZ_1024
  1450. bool "1024"
  1451. config UCLIBC_HAS_STDIO_BUFSIZ_2048
  1452. bool "2048"
  1453. config UCLIBC_HAS_STDIO_BUFSIZ_4096
  1454. bool "4096"
  1455. config UCLIBC_HAS_STDIO_BUFSIZ_8192
  1456. bool "8192"
  1457. # If you add more choices, you will need to update uClibc_stdio.h.
  1458. endchoice
  1459. choice
  1460. prompt "Stdio builtin buffer size (uClibc-specific)"
  1461. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1462. default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1463. help
  1464. When a FILE is created with fopen(), an attempt is made to allocate
  1465. a BUFSIZ buffer for it. If the allocation fails, fopen() will still
  1466. succeed but the FILE will be unbuffered.
  1467. This option adds a small amount of space to each FILE to act as an
  1468. emergency buffer in the event of a buffer allocation failure.
  1469. Most people will answer None.
  1470. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
  1471. bool "None"
  1472. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
  1473. bool "4"
  1474. config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
  1475. bool "8"
  1476. # If you add more choices, you will need to update uClibc_stdio.h.
  1477. endchoice
  1478. config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
  1479. bool "Attempt to shutdown stdio subsystem when abort() is called."
  1480. help
  1481. ANSI/ISO C99 requires abort() to be asyn-signal-safe. So there was
  1482. a behavioral change made in SUSv3. Previously, abort() was required
  1483. to have the affect of fclose() on all open streams. The wording has
  1484. been changed to "may" from "shall".
  1485. Most people will answer N.
  1486. config UCLIBC_HAS_STDIO_GETC_MACRO
  1487. bool "Provide a macro version of getc()"
  1488. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1489. default y
  1490. help
  1491. Provide a macro version of getc().
  1492. Most people will answer Y.
  1493. config UCLIBC_HAS_STDIO_PUTC_MACRO
  1494. bool "Provide a macro version of putc()"
  1495. depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
  1496. default y
  1497. help
  1498. Provide a macro version of putc().
  1499. Most people will answer Y.
  1500. config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
  1501. bool "Support auto-r/w transition"
  1502. default y
  1503. help
  1504. Answer Y to enable the stdio subsystem to automaticly transition
  1505. between reading and writing. This relaxes the ANSI/ISO C99
  1506. requirement:
  1507. When a file is opened with update mode ('+' as the second or third
  1508. character in the list of mode argument values), both input and output
  1509. may be performed on the associated stream. However, output shall not
  1510. be directly followed by input without an intervening call to the
  1511. fflush function or to a file positioning function (fseek, fsetpos,
  1512. or rewind), and input shall not be directly followed by output without
  1513. an intervening call to a file positioning function, unless the input
  1514. operation encounters end­of­file.
  1515. Most people will answer Y.
  1516. config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
  1517. bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
  1518. help
  1519. Answer Y to enable a uClibc-specific extension to allow passing an
  1520. additional 'F' flag in the mode string for fopen() to specify that
  1521. the file should be open()ed with the O_LARGEFILE flag set.
  1522. Most people will answer N.
  1523. config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
  1524. bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
  1525. help
  1526. Answer Y to support a glibc extension to allow passing
  1527. additional 'x' flag in the mode string for fopen() to specify that
  1528. the file should be open()ed with the O_EXCL flag set.
  1529. Most people will answer N.
  1530. config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
  1531. bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
  1532. help
  1533. Answer Y to support a glibc extension to allow passing
  1534. additional 'e' flag in the mode string for fopen() to specify that
  1535. the file should be open()ed with the O_CLOEXEC flag set.
  1536. Most people will answer N.
  1537. config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
  1538. bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
  1539. help
  1540. Answer Y to support the glibc 'custom stream' extension functions
  1541. fmemopen(), open_memstream(), and fopencookie().
  1542. NOTE: There are some minor differences regarding seeking behavior.
  1543. Most people will answer N.
  1544. config UCLIBC_HAS_PRINTF_M_SPEC
  1545. bool "Support the '%m' specifier in printf format strings (glibc-compat)"
  1546. help
  1547. Answer Y to support a glibc extension to interpret '%m' in printf
  1548. format strings as an instruction to output the error message string
  1549. (as generated by strerror) corresponding to the current value of
  1550. 'errno'.
  1551. Most people will answer N.
  1552. config UCLIBC_HAS_ERRNO_MESSAGES
  1553. bool "Include the errno message text in the library"
  1554. default y
  1555. help
  1556. Answer Y if you want to include the errno message text in the
  1557. library. This adds about 3K to the library, but enables strerror()
  1558. to generate text other than 'Unknown error <number>'.
  1559. Most people will answer Y.
  1560. config UCLIBC_HAS_SYS_ERRLIST
  1561. bool "Support sys_errlist[] (obsolete-compat)"
  1562. depends on UCLIBC_HAS_ERRNO_MESSAGES
  1563. help
  1564. Answer Y if you want to support the obsolete sys_errlist[].
  1565. This adds about 0.5k to the library, except for the mips
  1566. arch where it adds over 4K.
  1567. WARNING! In the future, support for sys_errlist[] may be unavailable
  1568. in at least some configurations. In fact, it may be removed
  1569. altogether.
  1570. Most people will answer N.
  1571. Application writers: use the strerror(3) function.
  1572. config UCLIBC_HAS_SIGNUM_MESSAGES
  1573. bool "Include the signum message text in the library"
  1574. default y
  1575. help
  1576. Answer Y if you want to include the signum message text in the
  1577. library. This adds about 0.5K to the library, but enables strsignal()
  1578. to generate text other than 'Unknown signal <number>'.
  1579. Most people will answer Y.
  1580. config UCLIBC_HAS_SYS_SIGLIST
  1581. bool "Support sys_siglist[] (bsd-compat)"
  1582. depends on UCLIBC_HAS_SIGNUM_MESSAGES
  1583. help
  1584. Answer Y if you want to support sys_siglist[].
  1585. WARNING! In the future, support for sys_siglist[] may be unavailable
  1586. in at least some configurations. In fact, it may be removed
  1587. altogether.
  1588. Most people will answer N.
  1589. config UCLIBC_HAS_GNU_GETOPT
  1590. bool "Support gnu getopt"
  1591. default y
  1592. help
  1593. Answer Y if you want to include full gnu getopt() instead of a
  1594. (much smaller) SUSv3 compatible getopt().
  1595. Note that getopt_long, getopt_long_only as well as getsubopt
  1596. are implemented on top of this choice.
  1597. Most people will answer Y.
  1598. config UCLIBC_HAS_GETOPT_LONG
  1599. bool "Support getopt_long/getopt_long_only (glibc-compat)"
  1600. default y
  1601. help
  1602. Answer Y if you want to include getopt_long[_only()] used by many
  1603. apps.
  1604. Most people will answer Y.
  1605. config UCLIBC_HAS_GNU_GETSUBOPT
  1606. bool "Support getsubopt"
  1607. default y
  1608. help
  1609. Answer Y if you want to include getsubopt().
  1610. Most people will answer Y.
  1611. config UCLIBC_HAS_ARGP
  1612. bool "Support argp"
  1613. select UCLIBC_HAS_GETOPT_LONG
  1614. select UCLIBC_HAS_GNU_GETOPT
  1615. select UCLIBC_HAS_WCHAR
  1616. default n
  1617. help
  1618. Argp is an interface for parsing unix-style argument vectors. Unlike
  1619. the common getopt interface, it provides many advanced features in
  1620. addition to parsing options, such as automatic output in response to
  1621. `--help' and `--version' options.
  1622. A library can export an argp option parser, which programs can easily
  1623. use in conjunction with their own option parser.
  1624. Argp support is needed by elfutils libdw.
  1625. Most people can safely answer N.
  1626. endmenu
  1627. menu "Big and Tall"
  1628. config UCLIBC_HAS_REGEX
  1629. bool "Regular Expression Support"
  1630. default y
  1631. help
  1632. POSIX regular expression code is really big -- 53k all by itself.
  1633. If you don't use regular expressions, turn this off and save space.
  1634. Of course, if you only statically link, leave this on, since it will
  1635. only be included in your apps if you use regular expressions.
  1636. config UCLIBC_HAS_FNMATCH
  1637. bool "fnmatch Support"
  1638. default y
  1639. help
  1640. POSIX fnmatch.
  1641. config UCLIBC_HAS_WORDEXP
  1642. bool "Support the wordexp() interface"
  1643. depends on UCLIBC_HAS_GLOB
  1644. help
  1645. The SuSv3 wordexp() interface performs word expansions per the Shell
  1646. and Utilities volume of IEEE Std 1003.1-2001, Section 2.6. It is
  1647. intended for use by applications that want to implement all of the
  1648. standard Bourne shell expansions on input data.
  1649. This interface is rarely used, and very large. Unless you have a
  1650. pressing need for wordexp(), you should probably answer N.
  1651. config UCLIBC_HAS_NFTW
  1652. bool "Support the nftw() interface"
  1653. help
  1654. The SuSv3 nftw() interface is used to recursively descend
  1655. directory paths while repeatedly calling a function.
  1656. This interface is rarely used, and adds around 4.5k. Unless you have
  1657. a pressing need for nftw(), you should probably answer N.
  1658. config UCLIBC_HAS_FTW
  1659. bool "Support the ftw() interface (SUSv4-obsolete)"
  1660. depends on UCLIBC_SUSV4_LEGACY
  1661. help
  1662. The SuSv3 ftw() interface is used to recursively descend
  1663. directory paths while repeatedly calling a function.
  1664. This interface is rarely used, and adds around 4.5k. Unless you have
  1665. a pressing need for ftw(), you should probably answer N.
  1666. config UCLIBC_HAS_FTS
  1667. bool "Support the fts() interface (bsd-compat)"
  1668. help
  1669. The fts functions are provided for traversing UNIX file hierarchies.
  1670. This interface is currently used by the elfutils and adds
  1671. around 7.5k.
  1672. You should port your application to use the POSIX nftw()
  1673. interface.
  1674. Unless you need to build/use elfutils, you should prolly answer N.
  1675. config UCLIBC_HAS_GLOB
  1676. bool "Support the glob() interface"
  1677. depends on UCLIBC_HAS_FNMATCH
  1678. default y
  1679. help
  1680. The glob interface is somewhat large (weighing in at about 2,5k). It
  1681. is used fairly often, but is an option since people wanting to go for
  1682. absolute minimum size may wish to omit it.
  1683. Most people will answer Y.
  1684. config UCLIBC_HAS_GNU_GLOB
  1685. bool "Support gnu glob() interface"
  1686. depends on UCLIBC_HAS_GLOB
  1687. help
  1688. The gnu glob interface is somewhat larger (weighing in at about 4,2k)
  1689. than it's SuSv3 counterpart (and is out of date). It is an old copy
  1690. from glibc and does not support all the GNU specific options.
  1691. Answer Y if you want to include full gnu glob() instead of the smaller
  1692. SUSv3 compatible glob().
  1693. Most people will answer N.
  1694. endmenu
  1695. menu "Library Installation Options"
  1696. config RUNTIME_PREFIX
  1697. string "uClibc runtime library directory"
  1698. default "/usr/$(TARGET_ARCH)-linux-uclibc/"
  1699. help
  1700. RUNTIME_PREFIX is the directory into which the uClibc runtime
  1701. libraries will be installed. The result will look something
  1702. like the following:
  1703. $(RUNTIME_PREFIX)/
  1704. lib/ <contains all runtime libraries>
  1705. usr/bin/ldd <the ldd utility program>
  1706. sbin/ldconfig <the ldconfig utility program>
  1707. This value is used by the 'make install' Makefile target. Since this
  1708. directory is compiled into the shared library loader, you will need to
  1709. recompile uClibc if you change this value...
  1710. For a typical target system this should be set to "/", such that
  1711. 'make install' will install /lib/libuClibc-<VERSION>.so
  1712. config DEVEL_PREFIX
  1713. string "uClibc development environment directory"
  1714. default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
  1715. help
  1716. DEVEL_PREFIX is the directory into which the uClibc development
  1717. environment will be installed. The result will look something
  1718. like the following:
  1719. $(DEVEL_PREFIX)/
  1720. lib/ <contains static libs>
  1721. include/ <Where all the header files go>
  1722. This value is used by the 'make install' Makefile target when
  1723. installing a uClibc development environment.
  1724. For a typical target system this should be set to "/usr", such that
  1725. 'make install' will install /usr/include/<header files>.
  1726. config MULTILIB_DIR
  1727. string "library path component"
  1728. default "lib"
  1729. help
  1730. Path component where libraries reside.
  1731. For a typical target system this should be set to "lib", such that
  1732. 'make install' will install libraries to "/lib" and "/usr/lib"
  1733. respectively
  1734. DEVEL_PREFIX/MULTILIB_DIR
  1735. RUNTIME_PREFIX/MULTILIB_DIR
  1736. Other settings may include "lib32" or "lib64".
  1737. config HARDWIRED_ABSPATH
  1738. bool "Hardwire absolute paths into linker scripts"
  1739. default y
  1740. help
  1741. This prepends absolute paths to the libraries mentioned in linker
  1742. scripts such as libc.so.
  1743. This is a build time optimization. It has no impact on dynamic
  1744. linking at runtime, which doesn't use linker scripts.
  1745. You must disable this to use uClibc with old non-sysroot toolchains,
  1746. such as the prebuilt binary cross compilers at:
  1747. http://uclibc.org/downloads/binaries
  1748. The amount of time saved by this optimization is actually too small to
  1749. measure. The linker just had to search the library path to find the
  1750. linker script, so the dentries are cache hot if it has to search the
  1751. same path again. But it's what glibc does, so we do it too.
  1752. endmenu
  1753. menu "Security options"
  1754. config UCLIBC_BUILD_PIE
  1755. bool "Build utilities as ET_DYN/PIE executables"
  1756. depends on HAVE_SHARED
  1757. depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_nds32
  1758. select FORCE_SHAREABLE_TEXT_SEGMENTS
  1759. help
  1760. If you answer Y here, ldd and iconv are built as ET_DYN/PIE
  1761. executables.
  1762. It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
  1763. More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .
  1764. WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
  1765. all libraries have to be built with -fPIC or -fpic, and all
  1766. assembler functions must be written as position independent
  1767. code (PIC).
  1768. config HAVE_NO_SSP
  1769. bool
  1770. config UCLIBC_HAS_SSP
  1771. bool "Support for GCC stack smashing protector"
  1772. depends on !HAVE_NO_SSP
  1773. help
  1774. Add code to support GCC's -fstack-protector[-all] option to uClibc.
  1775. This requires GCC 4.1 or newer. GCC does not have to provide libssp,
  1776. the needed functions are added to ldso/libc instead.
  1777. GCC's stack protector is a reimplementation of IBM's propolice.
  1778. See http://www.trl.ibm.com/projects/security/ssp/ and
  1779. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  1780. for details.
  1781. Note that NOEXECSTACK on a kernel with address space randomization
  1782. is generally sufficient to prevent most buffer overflow exploits
  1783. without increasing code size. This option essentially adds debugging
  1784. code to catch them.
  1785. Most people will answer N.
  1786. config SSP_QUICK_CANARY
  1787. bool "Use simple guard values without accessing /dev/urandom"
  1788. depends on UCLIBC_HAS_SSP
  1789. help
  1790. Use gettimeofday(2) to define the __guard without accessing
  1791. /dev/urandom.
  1792. WARNING: This makes smashing stack protector vulnerable to timing
  1793. attacks.
  1794. Most people will answer N.
  1795. choice
  1796. prompt "Propolice protection blocking signal"
  1797. depends on UCLIBC_HAS_SSP
  1798. depends on DODEBUG
  1799. default PROPOLICE_BLOCK_SEGV
  1800. help
  1801. "abort" use SIGABRT to block offending programs.
  1802. This is the default implementation.
  1803. "segfault" use SIGSEGV to block offending programs.
  1804. Use this for debugging.
  1805. If unsure, answer "abort".
  1806. config PROPOLICE_BLOCK_ABRT
  1807. bool "abort"
  1808. config PROPOLICE_BLOCK_SEGV
  1809. bool "segfault"
  1810. endchoice
  1811. config UCLIBC_BUILD_SSP
  1812. bool "Build uClibc with -fstack-protector"
  1813. depends on UCLIBC_HAS_SSP
  1814. help
  1815. Build all uClibc libraries and executables with -fstack-protector,
  1816. adding extra stack overflow checking to most uClibc functions.
  1817. config UCLIBC_BUILD_RELRO
  1818. bool "Build uClibc with linker option -z RELRO"
  1819. depends on HAVE_SHARED
  1820. default y
  1821. help
  1822. Build all libraries and executables with "ld -z relro".
  1823. This tells the linker to mark chunks of an executable or shared
  1824. library read-only after applying dynamic relocations. (This comes
  1825. up when a global const variable is initialized to the address of a
  1826. function or the value of another global variable.)
  1827. This is a fairly obscure option the ld man page doesn't even bother
  1828. to document properly. It's a security paranoia issue that's more
  1829. likely to consume memory (by allocating an extra page) rather than
  1830. save it.
  1831. This is explained in more depth at
  1832. http://www.airs.com/blog/archives/189
  1833. Nobody is likely to care whether you say Y or N here.
  1834. config UCLIBC_BUILD_NOW
  1835. bool "Build uClibc with linker option -z NOW"
  1836. depends on HAVE_SHARED
  1837. help
  1838. Build all libraries and executables with "ld -z now".
  1839. This tells the linker to resolve all symbols when the library is
  1840. first loaded, rather than when each function is first called. This
  1841. increases start-up latency by a few microseconds and may do
  1842. unnecessary work (resolving symbols that are never used), but the
  1843. realtime people like it for making microbenchmark timings slightly
  1844. more predictable and in some cases it can be slightly faster due to
  1845. CPU cache behavior (not having to fault the linker back in to do
  1846. lazy symbol resolution).
  1847. Most people can't tell the difference between selecting Y or N here.
  1848. config UCLIBC_BUILD_NOEXECSTACK
  1849. bool "Build uClibc with noexecstack marking"
  1850. default y
  1851. help
  1852. Mark all assembler files as noexecstack, which will mark uClibc
  1853. as not requiring an executable stack. (This doesn't prevent other
  1854. files you link against from claiming to need an executable stack, it
  1855. just won't cause uClibc to request it unnecessarily.)
  1856. This is a security thing to make buffer overflows harder to exploit.
  1857. By itself, it's kind of useless, as Linus Torvalds explained in 1998:
  1858. http://old.lwn.net/1998/0806/a/linus-noexec.html
  1859. It only actually provides any security when combined with address
  1860. space randomization, explained here: http://lwn.net/Articles/121845/
  1861. Address space randomization is on by default in current linux
  1862. kernels (although it can be disabled using the option
  1863. CONFIG_COMPAT_BRK).
  1864. You should probably say Y.
  1865. endmenu
  1866. menu "Development/debugging options"
  1867. config CROSS_COMPILER_PREFIX
  1868. string "Cross-compiling toolchain prefix"
  1869. default ""
  1870. help
  1871. The prefix used to execute your cross-compiling toolchain. For
  1872. example, if you run 'arm-linux-uclibc-gcc' to compile something,
  1873. then enter 'arm-linux-uclibc-' here.
  1874. config UCLIBC_EXTRA_CFLAGS
  1875. string "Extra CFLAGS"
  1876. default ""
  1877. help
  1878. Add any additional CFLAGS to be used to build uClibc.
  1879. config DODEBUG
  1880. bool "Enable debugging symbols"
  1881. select EXTRA_WARNINGS
  1882. help
  1883. Say Y here if you wish to compile uClibc with debugging symbols.
  1884. This will allow you to use a debugger to examine uClibc internals
  1885. while applications are running. This increases the size of the
  1886. library considerably and should only be used when doing development.
  1887. If you are doing development and want to debug uClibc, answer Y.
  1888. Otherwise, answer N.
  1889. config DODEBUG_PT
  1890. bool "Build pthread with debugging output"
  1891. depends on UCLIBC_HAS_THREADS && UCLIBC_HAS_LINUXTHREADS
  1892. help
  1893. Enable debug output in libpthread. This is only useful when doing
  1894. development in libpthread itself.
  1895. Otherwise, answer N.
  1896. config DOSTRIP
  1897. bool "Strip libraries and executables"
  1898. default y
  1899. depends on !DODEBUG
  1900. help
  1901. Say Y here if you do wish to strip all uClibc libraries and
  1902. executables. No stripping increases the size of the binaries
  1903. considerably, but makes it possible to debug uClibc libraries.
  1904. Most people will answer Y.
  1905. config DOASSERTS
  1906. bool "Build with run-time assertion testing"
  1907. help
  1908. Say Y here to include runtime assertion tests.
  1909. This enables runtime assertion testing in some code, which can
  1910. increase the size of the library and incur runtime overhead.
  1911. If you say N, then this testing will be disabled.
  1912. config SUPPORT_LD_DEBUG
  1913. bool "Build the shared library loader with debugging support"
  1914. depends on HAVE_SHARED
  1915. help
  1916. Answer Y here to enable all the extra code needed to debug the uClibc
  1917. native shared library loader. The level of debugging noise that is
  1918. generated depends on the LD_DEBUG environment variable... Just set
  1919. LD_DEBUG to something like: 'LD_DEBUG=token1,token2,.. prog' to
  1920. debug your application. Diagnostic messages will then be printed to
  1921. the stderr.
  1922. For now these debugging tokens are available:
  1923. detail provide more information for some options
  1924. move display copy processing
  1925. symbols display symbol table processing
  1926. reloc display relocation processing; detail shows the
  1927. relocation patch
  1928. nofixups never fixes up jump relocations
  1929. bindings displays the resolve processing (function calls);
  1930. detail shows the relocation patch
  1931. vdso display vdso symbol table processing
  1932. all Enable everything!
  1933. The additional environment variable:
  1934. LD_DEBUG_OUTPUT=file
  1935. redirects the diagnostics to an output file created using
  1936. the specified name and the process id as a suffix.
  1937. An excellent start is simply:
  1938. $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
  1939. or to log everything to a file named 'logfile', try this
  1940. $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname
  1941. If you are doing development and want to debug uClibc's shared library
  1942. loader, answer Y. Mere mortals answer N.
  1943. config SUPPORT_LD_DEBUG_EARLY
  1944. bool "Build the shared library loader with early debugging support"
  1945. depends on HAVE_SHARED
  1946. help
  1947. Answer Y here to if you find the uClibc shared library loader is
  1948. crashing or otherwise not working very early on. This is typical
  1949. only when starting a new port when you haven't figured out how to
  1950. properly get the values for argc, argv, environ, etc. This method
  1951. allows a degree of visibility into the very early shared library
  1952. loader initialization process. If you are doing development and want
  1953. to debug the uClibc shared library loader early initialization,
  1954. answer Y. Mere mortals answer N.
  1955. config UCLIBC_MALLOC_DEBUGGING
  1956. bool "Build malloc with debugging support"
  1957. depends on MALLOC || MALLOC_STANDARD
  1958. select DOASSERTS
  1959. help
  1960. Answer Y here to compile extra debugging support code into malloc.
  1961. Malloc debugging output may then be enabled at runtime using the
  1962. MALLOC_DEBUG environment variable.
  1963. The value of MALLOC_DEBUG should be an integer, which is interpreted
  1964. as a bitmask with the following bits:
  1965. 1 - do extra consistency checking
  1966. 2 - output messages for malloc/free calls and OS
  1967. allocation calls
  1968. 4 - output messages for the `MMB' layer
  1969. 8 - output messages for internal malloc heap manipulation
  1970. calls
  1971. Because this increases the size of malloc appreciably (due to strings
  1972. etc), you should say N unless you need to debug a malloc problem.
  1973. config UCLIBC_HAS_BACKTRACE
  1974. bool "Add support for application self-debugging"
  1975. depends on HAVE_SHARED
  1976. help
  1977. Answer Y here to compile support for application self-debugging that
  1978. provides the following new functions:
  1979. backtrace, backtrace_symbols, backtrace_symbols_fd
  1980. The backtrace functionality is currently supported on some platforms, and it
  1981. based on dwarf2 informations to properly work, so any application that
  1982. want to use backtrace needs to be built with -fexceptions flag.
  1983. The symbol names may be unavailable without the use of special linker
  1984. options. For systems using the GNU linker, it is necessary to use the
  1985. -rdynamic linker option too. Note that names of "static" functions are not
  1986. exposed, and won't be available in the backtrace.
  1987. config WARNINGS
  1988. string "Compiler Warnings"
  1989. default "-Wall"
  1990. help
  1991. Set this to the set of compiler warnings you wish to see while compiling.
  1992. config EXTRA_WARNINGS
  1993. bool "Enable extra annoying warnings"
  1994. help
  1995. If you wish to build with extra warnings enabled, say Y here.
  1996. endmenu