Config.in 26 KB

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  1. #
  2. mainmenu "Buildroot $BR2_VERSION Configuration"
  3. config BR2_HAVE_DOT_CONFIG
  4. bool
  5. default y
  6. config BR2_VERSION
  7. string
  8. option env="BR2_VERSION_FULL"
  9. config BR2_HOSTARCH
  10. string
  11. option env="HOSTARCH"
  12. config BR2_BUILD_DIR
  13. string
  14. option env="BUILD_DIR"
  15. # Hidden config symbols for packages to check system gcc version
  16. config BR2_HOST_GCC_VERSION
  17. string
  18. option env="HOST_GCC_VERSION"
  19. config BR2_HOST_GCC_AT_LEAST_4_5
  20. bool
  21. default y if BR2_HOST_GCC_VERSION = "4 5"
  22. config BR2_HOST_GCC_AT_LEAST_4_6
  23. bool
  24. default y if BR2_HOST_GCC_VERSION = "4 6"
  25. select BR2_HOST_GCC_AT_LEAST_4_5
  26. config BR2_HOST_GCC_AT_LEAST_4_7
  27. bool
  28. default y if BR2_HOST_GCC_VERSION = "4 7"
  29. select BR2_HOST_GCC_AT_LEAST_4_6
  30. config BR2_HOST_GCC_AT_LEAST_4_8
  31. bool
  32. default y if BR2_HOST_GCC_VERSION = "4 8"
  33. select BR2_HOST_GCC_AT_LEAST_4_7
  34. config BR2_HOST_GCC_AT_LEAST_4_9
  35. bool
  36. default y if BR2_HOST_GCC_VERSION = "4 9"
  37. select BR2_HOST_GCC_AT_LEAST_4_8
  38. config BR2_HOST_GCC_AT_LEAST_5
  39. bool
  40. default y if BR2_HOST_GCC_VERSION = "5"
  41. select BR2_HOST_GCC_AT_LEAST_4_9
  42. config BR2_HOST_GCC_AT_LEAST_6
  43. bool
  44. default y if BR2_HOST_GCC_VERSION = "6"
  45. select BR2_HOST_GCC_AT_LEAST_5
  46. config BR2_HOST_GCC_AT_LEAST_7
  47. bool
  48. default y if BR2_HOST_GCC_VERSION = "7"
  49. select BR2_HOST_GCC_AT_LEAST_6
  50. # Hidden boolean selected by packages in need of Java in order to build
  51. # (example: kodi)
  52. config BR2_NEEDS_HOST_JAVA
  53. bool
  54. # Hidden boolean selected by packages in need of javac in order to build
  55. # (example: classpath)
  56. config BR2_NEEDS_HOST_JAVAC
  57. bool
  58. # Hidden boolean selected by packages in need of jar in order to build
  59. # (example: classpath)
  60. config BR2_NEEDS_HOST_JAR
  61. bool
  62. # Hidden boolean selected by pre-built packages for x86, when they
  63. # need to run on x86-64 machines (example: pre-built external
  64. # toolchains, binary tools like SAM-BA, etc.).
  65. config BR2_HOSTARCH_NEEDS_IA32_LIBS
  66. bool
  67. # Hidden boolean selected by packages that need to build 32 bits
  68. # binaries with the host compiler, even on 64 bits build machines (e.g
  69. # bootloaders).
  70. config BR2_HOSTARCH_NEEDS_IA32_COMPILER
  71. bool
  72. # Hidden boolean selected by packages that need the host to have an
  73. # UTF8 locale.
  74. config BR2_NEEDS_HOST_UTF8_LOCALE
  75. bool
  76. source "arch/Config.in"
  77. menu "Build options"
  78. menu "Commands"
  79. config BR2_WGET
  80. string "Wget command"
  81. default "wget --passive-ftp -nd -t 3"
  82. config BR2_SVN
  83. string "Subversion (svn) command"
  84. default "svn --non-interactive"
  85. config BR2_BZR
  86. string "Bazaar (bzr) command"
  87. default "bzr"
  88. config BR2_GIT
  89. string "Git command"
  90. default "git"
  91. config BR2_CVS
  92. string "CVS command"
  93. default "cvs"
  94. config BR2_LOCALFILES
  95. string "Local files retrieval command"
  96. default "cp"
  97. config BR2_SCP
  98. string "Secure copy (scp) command"
  99. default "scp"
  100. config BR2_SSH
  101. string "Secure shell (ssh) command"
  102. default "ssh"
  103. config BR2_HG
  104. string "Mercurial (hg) command"
  105. default "hg"
  106. config BR2_ZCAT
  107. string "zcat command"
  108. default "gzip -d -c"
  109. help
  110. Command to be used to extract a gzip'ed file to stdout. zcat
  111. is identical to gunzip -c except that the former may not be
  112. available on your system.
  113. Default is "gzip -d -c"
  114. Other possible values include "gunzip -c" or "zcat".
  115. config BR2_BZCAT
  116. string "bzcat command"
  117. default "bzcat"
  118. help
  119. Command to be used to extract a bzip2'ed file to stdout.
  120. bzcat is identical to bunzip2 -c except that the former may
  121. not be available on your system.
  122. Default is "bzcat"
  123. Other possible values include "bunzip2 -c" or "bzip2 -d -c".
  124. config BR2_XZCAT
  125. string "xzcat command"
  126. default "xzcat"
  127. help
  128. Command to be used to extract a xz'ed file to stdout.
  129. Default is "xzcat"
  130. config BR2_LZCAT
  131. string "lzcat command"
  132. default "lzip -d -c"
  133. help
  134. Command to be used to extract a lzip'ed file to stdout.
  135. Default is "lzip -d -c"
  136. config BR2_TAR_OPTIONS
  137. string "Tar options"
  138. default ""
  139. help
  140. Options to pass to tar when extracting the sources.
  141. E.g. " -v --exclude='*.svn*'" to exclude all .svn internal
  142. files and to be verbose.
  143. endmenu
  144. config BR2_DEFCONFIG_FROM_ENV
  145. string
  146. option env="BR2_DEFCONFIG"
  147. config BR2_DEFCONFIG
  148. string "Location to save buildroot config"
  149. default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
  150. default "$(CONFIG_DIR)/defconfig"
  151. help
  152. When running 'make savedefconfig', the defconfig file will be
  153. saved in this location.
  154. config BR2_DL_DIR
  155. string "Download dir"
  156. default "$(TOPDIR)/dl"
  157. help
  158. Directory to store all the source files that we need to fetch.
  159. If the Linux shell environment has defined the BR2_DL_DIR
  160. environment variable, then this overrides this configuration
  161. item.
  162. The directory is organized with a subdirectory for each package.
  163. Each package has its own $(LIBFOO_DL_DIR) variable that can be used
  164. to find the correct path.
  165. The default is $(TOPDIR)/dl
  166. config BR2_HOST_DIR
  167. string "Host dir"
  168. default "$(BASE_DIR)/host"
  169. help
  170. Directory to store all the binary files that are built for the
  171. host. This includes the cross compilation toolchain when
  172. building the internal buildroot toolchain.
  173. The default is $(BASE_DIR)/host
  174. menu "Mirrors and Download locations"
  175. config BR2_PRIMARY_SITE
  176. string "Primary download site"
  177. default ""
  178. help
  179. Primary site to download from. If this option is set then
  180. buildroot will try to download package source first from this
  181. site and try the default if the file is not found.
  182. Valid URIs are:
  183. - URIs recognized by $(WGET)
  184. - local URIs of the form file://absolutepath
  185. - scp URIs of the form scp://[user@]host:path.
  186. config BR2_PRIMARY_SITE_ONLY
  187. bool "Only allow downloads from primary download site"
  188. depends on BR2_PRIMARY_SITE != ""
  189. help
  190. If this option is enabled, downloads will only be attempted
  191. from the primary download site. Other locations, like the
  192. package's official download location or the backup download
  193. site, will not be considered. Therefore, if the package is not
  194. present on the primary site, the download fails.
  195. This is useful for project developers who want to ensure that
  196. the project can be built even if the upstream tarball
  197. locations disappear.
  198. if !BR2_PRIMARY_SITE_ONLY
  199. config BR2_BACKUP_SITE
  200. string "Backup download site"
  201. default "http://sources.buildroot.net"
  202. help
  203. Backup site to download from. If this option is set then
  204. buildroot will fall back to download package sources from here
  205. if the normal location fails.
  206. config BR2_KERNEL_MIRROR
  207. string "Kernel.org mirror"
  208. default "https://cdn.kernel.org/pub"
  209. help
  210. kernel.org is mirrored on a number of servers around the
  211. world. The following allows you to select your preferred
  212. mirror. By default, a CDN is used, which automatically
  213. redirects to a mirror geographically close to you.
  214. Have a look on the kernel.org site for a list of mirrors, then
  215. enter the URL to the base directory. Examples:
  216. http://www.XX.kernel.org/pub (XX = country code)
  217. http://mirror.aarnet.edu.au/pub/ftp.kernel.org
  218. config BR2_GNU_MIRROR
  219. string "GNU Software mirror"
  220. default "http://ftpmirror.gnu.org"
  221. help
  222. GNU has multiple software mirrors scattered around the
  223. world. The following allows you to select your preferred
  224. mirror. By default, a generic address is used, which
  225. automatically selects an up-to-date and local mirror.
  226. Have a look on the gnu.org site for a list of mirrors, then
  227. enter the URL to the base directory. Examples:
  228. http://ftp.gnu.org/pub/gnu
  229. http://mirror.aarnet.edu.au/pub/gnu
  230. config BR2_LUAROCKS_MIRROR
  231. string "LuaRocks mirror"
  232. default "http://rocks.moonscript.org"
  233. help
  234. LuaRocks repository.
  235. See http://luarocks.org
  236. config BR2_CPAN_MIRROR
  237. string "CPAN mirror (Perl packages)"
  238. default "http://cpan.metacpan.org"
  239. help
  240. CPAN (Comprehensive Perl Archive Network) is a repository of
  241. Perl packages. It has multiple software mirrors scattered
  242. around the world. This option allows you to select a mirror.
  243. The list of mirrors is available at:
  244. http://search.cpan.org/mirror
  245. endif
  246. endmenu
  247. config BR2_JLEVEL
  248. int "Number of jobs to run simultaneously (0 for auto)"
  249. default "0"
  250. help
  251. Number of jobs to run simultaneously. If 0, determine
  252. automatically according to number of CPUs on the host system.
  253. config BR2_CCACHE
  254. bool "Enable compiler cache"
  255. help
  256. This option will enable the use of ccache, a compiler cache.
  257. It will cache the result of previous builds to speed up future
  258. builds. By default, the cache is stored in
  259. $HOME/.buildroot-ccache.
  260. Note that Buildroot does not try to invalidate the cache
  261. contents when the compiler changes in an incompatible way.
  262. Therefore, if you make a change to the compiler version and/or
  263. configuration, you are responsible for purging the ccache
  264. cache by removing the $HOME/.buildroot-ccache directory.
  265. if BR2_CCACHE
  266. config BR2_CCACHE_DIR
  267. string "Compiler cache location"
  268. default "$(HOME)/.buildroot-ccache"
  269. help
  270. Where ccache should store cached files.
  271. If the Linux shell environment has defined the BR2_CCACHE_DIR
  272. environment variable, then this overrides this configuration
  273. item.
  274. config BR2_CCACHE_INITIAL_SETUP
  275. string "Compiler cache initial setup"
  276. help
  277. Initial ccache settings to apply, such as --max-files or
  278. --max-size.
  279. For example, if your project is known to require more space
  280. than the default max cache size, then you might want to
  281. increase the cache size to a suitable amount using the -M
  282. (--max-size) option.
  283. The string you specify here is passed verbatim to ccache.
  284. Refer to ccache documentation for more details.
  285. These initial settings are applied after ccache has been
  286. compiled.
  287. config BR2_CCACHE_USE_BASEDIR
  288. bool "Use relative paths"
  289. default y
  290. help
  291. Allow ccache to convert absolute paths within the output
  292. directory into relative paths.
  293. During the build, many -I include directives are given with an
  294. absolute path. These absolute paths end up in the hashes that
  295. are computed by ccache. Therefore, when you build from a
  296. different directory, the hash will be different and the cached
  297. object will not be used.
  298. To improve cache performance, set this option to y. This
  299. allows ccache to rewrite absolute paths within the output
  300. directory into relative paths. Note that only paths within the
  301. output directory will be rewritten; therefore, if you change
  302. BR2_HOST_DIR to point outside the output directory and
  303. subsequently move it to a different location, this will lead
  304. to cache misses.
  305. This option has as a result that the debug information in the
  306. object files also has only relative paths. Therefore, make
  307. sure you cd to the build directory before starting gdb. See
  308. the section "COMPILING IN DIFFERENT DIRECTORIES" in the ccache
  309. manual for more information.
  310. endif
  311. config BR2_ENABLE_DEBUG
  312. bool "build packages with debugging symbols"
  313. help
  314. Build packages with debugging symbols enabled. All libraries
  315. and binaries in the 'staging' directory will have debugging
  316. symbols, which allows remote debugging even if libraries and
  317. binaries are stripped on the target. Whether libraries and
  318. binaries are stripped on the target is controlled by the
  319. BR2_STRIP_* options below.
  320. if BR2_ENABLE_DEBUG
  321. choice
  322. prompt "gcc debug level"
  323. default BR2_DEBUG_2
  324. help
  325. Set the debug level for gcc
  326. config BR2_DEBUG_1
  327. bool "debug level 1"
  328. help
  329. Debug level 1 produces minimal information, enough for making
  330. backtraces in parts of the program that you don't plan to
  331. debug. This includes descriptions of functions and external
  332. variables, but no information about local variables and no
  333. line numbers.
  334. config BR2_DEBUG_2
  335. bool "debug level 2"
  336. help
  337. The default gcc debug level is 2
  338. config BR2_DEBUG_3
  339. bool "debug level 3"
  340. help
  341. Level 3 includes extra information, such as all the macro
  342. definitions present in the program. Some debuggers support
  343. macro expansion when you use -g3.
  344. endchoice
  345. endif
  346. config BR2_STRIP_strip
  347. bool "strip target binaries"
  348. default y
  349. depends on !BR2_PACKAGE_HOST_ELF2FLT
  350. help
  351. Binaries and libraries in the target filesystem will be
  352. stripped using the normal 'strip' command. This allows to save
  353. space, mainly by removing debugging symbols. Debugging symbols
  354. on the target are needed for native debugging, but not when
  355. remote debugging is used.
  356. config BR2_STRIP_EXCLUDE_FILES
  357. string "executables that should not be stripped"
  358. default ""
  359. depends on BR2_STRIP_strip
  360. help
  361. You may specify a space-separated list of binaries and
  362. libraries here that should not be stripped on the target.
  363. config BR2_STRIP_EXCLUDE_DIRS
  364. string "directories that should be skipped when stripping"
  365. default ""
  366. depends on BR2_STRIP_strip
  367. help
  368. You may specify a space-separated list of directories that
  369. should be skipped when stripping. Binaries and libraries in
  370. these directories will not be touched. The directories should
  371. be specified relative to the target directory, without leading
  372. slash.
  373. choice
  374. prompt "gcc optimization level"
  375. default BR2_OPTIMIZE_S
  376. help
  377. Set the optimization level for gcc
  378. config BR2_OPTIMIZE_0
  379. bool "optimization level 0"
  380. help
  381. Do not optimize.
  382. config BR2_OPTIMIZE_1
  383. bool "optimization level 1"
  384. help
  385. Optimize. Optimizing compilation takes somewhat more time, and
  386. a lot more memory for a large function. With -O, the compiler
  387. tries to reduce code size and execution time, without
  388. performing any optimizations that take a great deal of
  389. compilation time. -O turns on the following optimization
  390. flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
  391. -fcprop-registers -floop-optimize -fif-conversion
  392. -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
  393. -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
  394. -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants. -O
  395. also turns on -fomit-frame-pointer on machines where doing so
  396. does not interfere with debugging.
  397. config BR2_OPTIMIZE_2
  398. bool "optimization level 2"
  399. help
  400. Optimize even more. GCC performs nearly all supported
  401. optimizations that do not involve a space-speed tradeoff. The
  402. compiler does not perform loop unrolling or function inlining
  403. when you specify -O2. As compared to -O, this option increases
  404. both compilation time and the performance of the generated
  405. code. -O2 turns on all optimization flags specified by -O. It
  406. also turns on the following optimization flags:
  407. -fthread-jumps -fcrossjumping -foptimize-sibling-calls
  408. -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
  409. -fexpensive-optimizations -fstrength-reduce
  410. -frerun-cse-after-loop -frerun-loop-opt -fcaller-saves
  411. -fpeephole2 -fschedule-insns -fschedule-insns2
  412. -fsched-interblock -fsched-spec -fregmove -fstrict-aliasing
  413. -fdelete-null-pointer-checks -freorder-blocks
  414. -freorder-functions -falign-functions -falign-jumps
  415. -falign-loops -falign-labels -ftree-vrp -ftree-pre. Please
  416. note the warning under -fgcse about invoking -O2 on programs
  417. that use computed gotos.
  418. config BR2_OPTIMIZE_3
  419. bool "optimization level 3"
  420. help
  421. Optimize yet more. -O3 turns on all optimizations specified by
  422. -O2 and also turns on the -finline-functions, -funswitch-loops
  423. and -fgcse-after-reload options.
  424. config BR2_OPTIMIZE_G
  425. bool "optimize for debugging"
  426. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
  427. help
  428. Optimize for debugging. This enables optimizations that do not
  429. interfere with debugging. It should be the optimization level
  430. of choice for the standard edit-compile-debug cycle, offering
  431. a reasonable level of optimization while maintaining fast
  432. compilation and a good debugging experience.
  433. config BR2_OPTIMIZE_S
  434. bool "optimize for size"
  435. help
  436. Optimize for size. -Os enables all -O2 optimizations that do
  437. not typically increase code size. It also performs further
  438. optimizations designed to reduce code size. -Os disables the
  439. following optimization flags: -falign-functions -falign-jumps
  440. -falign-loops -falign-labels -freorder-blocks
  441. -freorder-blocks-and-partition -fprefetch-loop-arrays
  442. -ftree-vect-loop-version
  443. This is the default.
  444. config BR2_OPTIMIZE_FAST
  445. bool "optimize for fast"
  446. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
  447. help
  448. Optimize for fast. Disregard strict standards
  449. compliance. -Ofast enables all -O3 optimizations. It also
  450. enables optimizations that are not valid for all
  451. standard-compliant programs. It turns on -ffast-math and the
  452. Fortran-specific -fstack-arrays, unless -fmax-stack-var-size
  453. is specified, and -fno-protect-parens.
  454. endchoice
  455. config BR2_GOOGLE_BREAKPAD_ENABLE
  456. bool "Enable google-breakpad support"
  457. depends on BR2_INSTALL_LIBSTDCPP
  458. depends on BR2_HOST_GCC_AT_LEAST_4_8 # C++11
  459. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
  460. depends on BR2_USE_WCHAR
  461. depends on BR2_TOOLCHAIN_HAS_THREADS
  462. depends on (BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_UCLIBC)
  463. depends on BR2_PACKAGE_GOOGLE_BREAKPAD_ARCH_SUPPORTS
  464. depends on BR2_PACKAGE_HOST_GOOGLE_BREAKPAD_ARCH_SUPPORTS
  465. select BR2_PACKAGE_GOOGLE_BREAKPAD
  466. help
  467. This option will enable the use of google breakpad, a library
  468. and tool suite that allows you to distribute an application to
  469. users with compiler-provided debugging information removed,
  470. record crashes in compact "minidump" files, send them back to
  471. your server and produce C and C++ stack traces from these
  472. minidumps. Breakpad can also write minidumps on request for
  473. programs that have not crashed.
  474. if BR2_GOOGLE_BREAKPAD_ENABLE
  475. config BR2_GOOGLE_BREAKPAD_INCLUDE_FILES
  476. string "List of executables and libraries to extract symbols from"
  477. default ""
  478. help
  479. You may specify a space-separated list of binaries and
  480. libraries with full paths relative to $(TARGET_DIR) of which
  481. debug symbols will be dumped for further use with google
  482. breakpad.
  483. A directory structure that can be used by minidump-stackwalk
  484. will be created at:
  485. $(STAGING_DIR)/usr/share/google-breakpad-symbols
  486. endif
  487. choice
  488. bool "libraries"
  489. default BR2_SHARED_LIBS if BR2_BINFMT_SUPPORTS_SHARED
  490. default BR2_STATIC_LIBS if !BR2_BINFMT_SUPPORTS_SHARED
  491. help
  492. Select the type of libraries you want to use on the target.
  493. The default is to build dynamic libraries and use those on the
  494. target filesystem, except when the architecture and/or the
  495. selected binary format does not support shared libraries.
  496. config BR2_STATIC_LIBS
  497. bool "static only"
  498. help
  499. Build and use only static libraries. No shared libraries will
  500. be installed on the target. This potentially increases your
  501. code size and should only be used if you know what you are
  502. doing. Note that some packages may not be available when this
  503. option is enabled, due to their need for dynamic library
  504. support.
  505. config BR2_SHARED_LIBS
  506. bool "shared only"
  507. depends on BR2_BINFMT_SUPPORTS_SHARED
  508. help
  509. Build and use only shared libraries. This is the recommended
  510. solution as it saves space and build time.
  511. config BR2_SHARED_STATIC_LIBS
  512. bool "both static and shared"
  513. depends on BR2_BINFMT_SUPPORTS_SHARED
  514. help
  515. Build both shared and static libraries, but link executables
  516. dynamically. While building both shared and static libraries
  517. take more time and more disk space, having static libraries
  518. may be useful to link some of the applications statically.
  519. endchoice
  520. config BR2_PACKAGE_OVERRIDE_FILE
  521. string "location of a package override file"
  522. default "$(CONFIG_DIR)/local.mk"
  523. help
  524. A package override file is a short makefile that contains
  525. variable definitions of the form <pkg>_OVERRIDE_SRCDIR, which
  526. allows to tell Buildroot to use an existing directory as the
  527. source directory for a particular package. See the Buildroot
  528. documentation for more details on this feature.
  529. config BR2_GLOBAL_PATCH_DIR
  530. string "global patch directories"
  531. help
  532. You may specify a space separated list of one or more
  533. directories containing global package patches. For a specific
  534. version <packageversion> of a specific package <packagename>,
  535. patches are applied as follows:
  536. First, the default Buildroot patch set for the package is
  537. applied from the package's directory in Buildroot.
  538. Then for every directory - <global-patch-dir> - that exists in
  539. BR2_GLOBAL_PATCH_DIR, if the directory
  540. <global-patch-dir>/<packagename>/<packageversion>/ exists,
  541. then all *.patch files in this directory will be applied.
  542. Otherwise, if the directory <global-patch-dir>/<packagename>
  543. exists, then all *.patch files in the directory will be
  544. applied.
  545. menu "Advanced"
  546. config BR2_COMPILER_PARANOID_UNSAFE_PATH
  547. bool "paranoid check of library/header paths"
  548. default y
  549. help
  550. By default, when this option is disabled, when the Buildroot
  551. cross-compiler will encounter an unsafe library or header path
  552. (such as /usr/include, or /usr/lib), the compiler will display
  553. a warning.
  554. By enabling this option, this warning is turned into an error,
  555. which will completely abort the build when such unsafe paths
  556. are encountered.
  557. Note that this mechanism is available for both the internal
  558. toolchain (through the toolchain wrapper and binutils patches)
  559. and external toolchain backends (through the toolchain
  560. wrapper).
  561. config BR2_REPRODUCIBLE
  562. bool "Make the build reproducible (experimental)"
  563. # SOURCE_DATE_EPOCH support in toolchain-wrapper requires GCC 4.4
  564. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
  565. help
  566. This option will remove all sources of non-reproducibility
  567. from the build process. For a given Buildroot configuration,
  568. this allows to generate exactly identical binaries from one
  569. build to the other, including on different machines.
  570. The current implementation is restricted to builds with the
  571. same output directory. Many (absolute) paths are recorded in
  572. intermediary files, and it is very likely that some of these
  573. paths leak into the target rootfs. If you build with the
  574. same O=... path, however, the result is identical.
  575. This is labeled as an experimental feature, as not all
  576. packages behave properly to ensure reproducibility.
  577. endmenu
  578. comment "Security Hardening Options"
  579. choice
  580. bool "Stack Smashing Protection"
  581. default BR2_SSP_ALL if BR2_ENABLE_SSP # legacy
  582. depends on BR2_TOOLCHAIN_HAS_SSP
  583. help
  584. Enable stack smashing protection support using GCC's
  585. -fstack-protector option family.
  586. See
  587. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  588. for details.
  589. Note that this requires the toolchain to have SSP support.
  590. This is always the case for glibc and eglibc toolchain, but is
  591. optional in uClibc toolchains.
  592. config BR2_SSP_NONE
  593. bool "None"
  594. help
  595. Disable stack-smashing protection.
  596. config BR2_SSP_REGULAR
  597. bool "-fstack-protector"
  598. help
  599. Emit extra code to check for buffer overflows, such as stack
  600. smashing attacks. This is done by adding a guard variable to
  601. functions with vulnerable objects. This includes functions
  602. that call alloca, and functions with buffers larger than 8
  603. bytes. The guards are initialized when a function is entered
  604. and then checked when the function exits. If a guard check
  605. fails, an error message is printed and the program exits.
  606. config BR2_SSP_STRONG
  607. bool "-fstack-protector-strong"
  608. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
  609. help
  610. Like -fstack-protector but includes additional functions to be
  611. protected - those that have local array definitions, or have
  612. references to local frame addresses.
  613. comment "Stack Smashing Protection strong needs a toolchain w/ gcc >= 4.9"
  614. depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
  615. config BR2_SSP_ALL
  616. bool "-fstack-protector-all"
  617. help
  618. Like -fstack-protector except that all functions are
  619. protected. This option might have a significant performance
  620. impact on the compiled binaries.
  621. endchoice
  622. comment "Stack Smashing Protection needs a toolchain w/ SSP"
  623. depends on !BR2_TOOLCHAIN_HAS_SSP
  624. choice
  625. bool "RELRO Protection"
  626. depends on BR2_SHARED_LIBS
  627. help
  628. Enable a link-time protection know as RELRO (RELocation Read
  629. Only) which helps to protect from certain type of exploitation
  630. techniques altering the content of some ELF sections.
  631. config BR2_RELRO_NONE
  632. bool "None"
  633. help
  634. Disables Relocation link-time protections.
  635. config BR2_RELRO_PARTIAL
  636. bool "Partial"
  637. help
  638. This option makes the dynamic section not writeable after
  639. initialization (with almost no performance penalty).
  640. config BR2_RELRO_FULL
  641. bool "Full"
  642. help
  643. This option includes the partial configuration, but also marks
  644. the GOT as read-only at the cost of initialization time during
  645. program loading, i.e every time an executable is started.
  646. endchoice
  647. comment "RELocation Read Only (RELRO) needs shared libraries"
  648. depends on !BR2_SHARED_LIBS
  649. choice
  650. bool "Buffer-overflow Detection (FORTIFY_SOURCE)"
  651. depends on BR2_TOOLCHAIN_USES_GLIBC
  652. depends on !BR2_OPTIMIZE_0
  653. help
  654. Enable the _FORTIFY_SOURCE macro which introduces additional
  655. checks to detect buffer-overflows in the following standard
  656. library functions: memcpy, mempcpy, memmove, memset, strcpy,
  657. stpcpy, strncpy, strcat, strncat, sprintf, vsprintf, snprintf,
  658. vsnprintf, gets.
  659. NOTE: This feature requires an optimization level of s/1/2/3/g
  660. Support for this feature has been present since GCC 4.x.
  661. config BR2_FORTIFY_SOURCE_NONE
  662. bool "None"
  663. help
  664. Disables additional checks to detect buffer-overflows.
  665. config BR2_FORTIFY_SOURCE_1
  666. bool "Conservative"
  667. help
  668. This option sets _FORTIFY_SOURCE to 1 and only introduces
  669. checks that shouldn't change the behavior of conforming
  670. programs. Adds checks at compile-time only.
  671. config BR2_FORTIFY_SOURCE_2
  672. bool "Aggressive"
  673. help
  674. This option sets _FORTIFY_SOURCES to 2 and some more
  675. checking is added, but some conforming programs might fail.
  676. Also adds checks at run-time (detected buffer overflow
  677. terminates the program)
  678. endchoice
  679. comment "Fortify Source needs a glibc toolchain and optimization"
  680. depends on (!BR2_TOOLCHAIN_USES_GLIBC || BR2_OPTIMIZE_0)
  681. endmenu
  682. source "toolchain/Config.in"
  683. source "system/Config.in"
  684. source "linux/Config.in"
  685. source "package/Config.in"
  686. source "fs/Config.in"
  687. source "boot/Config.in"
  688. source "package/Config.in.host"
  689. source "Config.in.legacy"
  690. source "$BR2_BUILD_DIR/.br2-external.in"