Config.in 27 KB

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  1. #
  2. mainmenu "Buildroot $BR2_VERSION Configuration"
  3. config BR2_HAVE_DOT_CONFIG
  4. bool
  5. default y
  6. config BR2_VERSION
  7. string
  8. option env="BR2_VERSION_FULL"
  9. config BR2_HOSTARCH
  10. string
  11. option env="HOSTARCH"
  12. config BR2_BASE_DIR
  13. string
  14. option env="BASE_DIR"
  15. # br2-external paths definitions
  16. source "$BR2_BASE_DIR/.br2-external.in.paths"
  17. # Hidden config symbols for packages to check system gcc version
  18. config BR2_HOST_GCC_VERSION
  19. string
  20. option env="HOST_GCC_VERSION"
  21. config BR2_HOST_GCC_AT_LEAST_4_9
  22. bool
  23. default y if BR2_HOST_GCC_VERSION = "4 9"
  24. config BR2_HOST_GCC_AT_LEAST_5
  25. bool
  26. default y if BR2_HOST_GCC_VERSION = "5"
  27. select BR2_HOST_GCC_AT_LEAST_4_9
  28. config BR2_HOST_GCC_AT_LEAST_6
  29. bool
  30. default y if BR2_HOST_GCC_VERSION = "6"
  31. select BR2_HOST_GCC_AT_LEAST_5
  32. config BR2_HOST_GCC_AT_LEAST_7
  33. bool
  34. default y if BR2_HOST_GCC_VERSION = "7"
  35. select BR2_HOST_GCC_AT_LEAST_6
  36. config BR2_HOST_GCC_AT_LEAST_8
  37. bool
  38. default y if BR2_HOST_GCC_VERSION = "8"
  39. select BR2_HOST_GCC_AT_LEAST_7
  40. config BR2_HOST_GCC_AT_LEAST_9
  41. bool
  42. default y if BR2_HOST_GCC_VERSION = "9"
  43. select BR2_HOST_GCC_AT_LEAST_8
  44. # When adding new entries above, be sure to update
  45. # the HOSTCC_MAX_VERSION variable in the Makefile.
  46. # Hidden boolean selected by packages in need of Java in order to build
  47. # (example: kodi)
  48. config BR2_NEEDS_HOST_JAVA
  49. bool
  50. # Hidden boolean selected by packages in need of javac in order to build
  51. # (example: classpath)
  52. config BR2_NEEDS_HOST_JAVAC
  53. bool
  54. # Hidden boolean selected by packages in need of jar in order to build
  55. # (example: classpath)
  56. config BR2_NEEDS_HOST_JAR
  57. bool
  58. # Hidden boolean selected by pre-built packages for x86, when they
  59. # need to run on x86-64 machines (example: pre-built external
  60. # toolchains, binary tools like SAM-BA, etc.).
  61. config BR2_HOSTARCH_NEEDS_IA32_LIBS
  62. bool
  63. # Hidden boolean selected by packages that need to build 32 bits
  64. # binaries with the host compiler, even on 64 bits build machines (e.g
  65. # bootloaders).
  66. config BR2_HOSTARCH_NEEDS_IA32_COMPILER
  67. bool
  68. # Hidden boolean selected by packages that need the host to have an
  69. # UTF8 locale.
  70. config BR2_NEEDS_HOST_UTF8_LOCALE
  71. bool
  72. source "arch/Config.in"
  73. menu "Build options"
  74. menu "Commands"
  75. config BR2_WGET
  76. string "Wget command"
  77. default "wget --passive-ftp -nd -t 3"
  78. config BR2_SVN
  79. string "Subversion (svn) command"
  80. default "svn --non-interactive"
  81. config BR2_BZR
  82. string "Bazaar (bzr) command"
  83. default "bzr"
  84. config BR2_GIT
  85. string "Git command"
  86. default "git"
  87. config BR2_CVS
  88. string "CVS command"
  89. default "cvs"
  90. config BR2_LOCALFILES
  91. string "Local files retrieval command"
  92. default "cp"
  93. config BR2_SCP
  94. string "Secure copy (scp) command"
  95. default "scp"
  96. config BR2_HG
  97. string "Mercurial (hg) command"
  98. default "hg"
  99. config BR2_ZCAT
  100. string "zcat command"
  101. default "gzip -d -c"
  102. help
  103. Command to be used to extract a gzip'ed file to stdout. zcat
  104. is identical to gunzip -c except that the former may not be
  105. available on your system.
  106. Default is "gzip -d -c"
  107. Other possible values include "gunzip -c" or "zcat".
  108. config BR2_BZCAT
  109. string "bzcat command"
  110. default "bzcat"
  111. help
  112. Command to be used to extract a bzip2'ed file to stdout.
  113. bzcat is identical to bunzip2 -c except that the former may
  114. not be available on your system.
  115. Default is "bzcat"
  116. Other possible values include "bunzip2 -c" or "bzip2 -d -c".
  117. config BR2_XZCAT
  118. string "xzcat command"
  119. default "xzcat"
  120. help
  121. Command to be used to extract a xz'ed file to stdout.
  122. Default is "xzcat"
  123. config BR2_LZCAT
  124. string "lzcat command"
  125. default "lzip -d -c"
  126. help
  127. Command to be used to extract a lzip'ed file to stdout.
  128. Default is "lzip -d -c"
  129. config BR2_TAR_OPTIONS
  130. string "Tar options"
  131. default ""
  132. help
  133. Options to pass to tar when extracting the sources.
  134. E.g. " -v --exclude='*.svn*'" to exclude all .svn internal
  135. files and to be verbose.
  136. endmenu
  137. config BR2_DEFCONFIG_FROM_ENV
  138. string
  139. option env="BR2_DEFCONFIG"
  140. config BR2_DEFCONFIG
  141. string "Location to save buildroot config"
  142. default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
  143. default "$(CONFIG_DIR)/defconfig"
  144. help
  145. When running 'make savedefconfig', the defconfig file will be
  146. saved in this location.
  147. config BR2_DL_DIR
  148. string "Download dir"
  149. default "$(TOPDIR)/dl"
  150. help
  151. Directory to store all the source files that we need to fetch.
  152. If the Linux shell environment has defined the BR2_DL_DIR
  153. environment variable, then this overrides this configuration
  154. item.
  155. The directory is organized with a subdirectory for each
  156. package. Each package has its own $(LIBFOO_DL_DIR) variable
  157. that can be used to find the correct path.
  158. The default is $(TOPDIR)/dl
  159. config BR2_HOST_DIR
  160. string "Host dir"
  161. default "$(BASE_DIR)/host"
  162. help
  163. Directory to store all the binary files that are built for the
  164. host. This includes the cross compilation toolchain when
  165. building the internal buildroot toolchain.
  166. The default is $(BASE_DIR)/host
  167. menu "Mirrors and Download locations"
  168. config BR2_PRIMARY_SITE
  169. string "Primary download site"
  170. default ""
  171. help
  172. Primary site to download from. If this option is set then
  173. buildroot will try to download package source first from this
  174. site and try the default if the file is not found.
  175. Valid URIs are:
  176. - URIs recognized by $(WGET)
  177. - local URIs of the form file://absolutepath
  178. - scp URIs of the form scp://[user@]host:path.
  179. config BR2_PRIMARY_SITE_ONLY
  180. bool "Only allow downloads from primary download site"
  181. depends on BR2_PRIMARY_SITE != ""
  182. help
  183. If this option is enabled, downloads will only be attempted
  184. from the primary download site. Other locations, like the
  185. package's official download location or the backup download
  186. site, will not be considered. Therefore, if the package is not
  187. present on the primary site, the download fails.
  188. This is useful for project developers who want to ensure that
  189. the project can be built even if the upstream tarball
  190. locations disappear.
  191. if !BR2_PRIMARY_SITE_ONLY
  192. config BR2_BACKUP_SITE
  193. string "Backup download site"
  194. default "http://sources.buildroot.net"
  195. help
  196. Backup site to download from. If this option is set then
  197. buildroot will fall back to download package sources from here
  198. if the normal location fails.
  199. config BR2_KERNEL_MIRROR
  200. string "Kernel.org mirror"
  201. default "https://cdn.kernel.org/pub"
  202. help
  203. kernel.org is mirrored on a number of servers around the
  204. world. The following allows you to select your preferred
  205. mirror. By default, a CDN is used, which automatically
  206. redirects to a mirror geographically close to you.
  207. Have a look on the kernel.org site for a list of mirrors, then
  208. enter the URL to the base directory. Examples:
  209. http://www.XX.kernel.org/pub (XX = country code)
  210. http://mirror.aarnet.edu.au/pub/ftp.kernel.org
  211. config BR2_GNU_MIRROR
  212. string "GNU Software mirror"
  213. default "http://ftpmirror.gnu.org"
  214. help
  215. GNU has multiple software mirrors scattered around the
  216. world. The following allows you to select your preferred
  217. mirror. By default, a generic address is used, which
  218. automatically selects an up-to-date and local mirror.
  219. Have a look on the gnu.org site for a list of mirrors, then
  220. enter the URL to the base directory. Examples:
  221. http://ftp.gnu.org/pub/gnu
  222. http://mirror.aarnet.edu.au/pub/gnu
  223. config BR2_LUAROCKS_MIRROR
  224. string "LuaRocks mirror"
  225. default "http://rocks.moonscript.org"
  226. help
  227. LuaRocks repository.
  228. See http://luarocks.org
  229. config BR2_CPAN_MIRROR
  230. string "CPAN mirror (Perl packages)"
  231. default "http://cpan.metacpan.org"
  232. help
  233. CPAN (Comprehensive Perl Archive Network) is a repository of
  234. Perl packages. It has multiple software mirrors scattered
  235. around the world. This option allows you to select a mirror.
  236. The list of mirrors is available at:
  237. http://search.cpan.org/mirror
  238. endif
  239. endmenu
  240. config BR2_JLEVEL
  241. int "Number of jobs to run simultaneously (0 for auto)"
  242. default "0"
  243. help
  244. Number of jobs to run simultaneously. If 0, determine
  245. automatically according to number of CPUs on the host system.
  246. config BR2_CCACHE
  247. bool "Enable compiler cache"
  248. help
  249. This option will enable the use of ccache, a compiler cache.
  250. It will cache the result of previous builds to speed up future
  251. builds. By default, the cache is stored in
  252. $HOME/.buildroot-ccache.
  253. Note that Buildroot does not try to invalidate the cache
  254. contents when the compiler changes in an incompatible way.
  255. Therefore, if you make a change to the compiler version and/or
  256. configuration, you are responsible for purging the ccache
  257. cache by removing the $HOME/.buildroot-ccache directory.
  258. if BR2_CCACHE
  259. config BR2_CCACHE_DIR
  260. string "Compiler cache location"
  261. default "$(HOME)/.buildroot-ccache"
  262. help
  263. Where ccache should store cached files.
  264. If the Linux shell environment has defined the BR2_CCACHE_DIR
  265. environment variable, then this overrides this configuration
  266. item.
  267. config BR2_CCACHE_INITIAL_SETUP
  268. string "Compiler cache initial setup"
  269. help
  270. Initial ccache settings to apply, such as --max-files or
  271. --max-size.
  272. For example, if your project is known to require more space
  273. than the default max cache size, then you might want to
  274. increase the cache size to a suitable amount using the -M
  275. (--max-size) option.
  276. The string you specify here is passed verbatim to ccache.
  277. Refer to ccache documentation for more details.
  278. These initial settings are applied after ccache has been
  279. compiled.
  280. config BR2_CCACHE_USE_BASEDIR
  281. bool "Use relative paths"
  282. default y
  283. help
  284. Allow ccache to convert absolute paths within the output
  285. directory into relative paths.
  286. During the build, many -I include directives are given with an
  287. absolute path. These absolute paths end up in the hashes that
  288. are computed by ccache. Therefore, when you build from a
  289. different directory, the hash will be different and the cached
  290. object will not be used.
  291. To improve cache performance, set this option to y. This
  292. allows ccache to rewrite absolute paths within the output
  293. directory into relative paths. Note that only paths within the
  294. output directory will be rewritten; therefore, if you change
  295. BR2_HOST_DIR to point outside the output directory and
  296. subsequently move it to a different location, this will lead
  297. to cache misses.
  298. This option has as a result that the debug information in the
  299. object files also has only relative paths. Therefore, make
  300. sure you cd to the build directory before starting gdb. See
  301. the section "COMPILING IN DIFFERENT DIRECTORIES" in the ccache
  302. manual for more information.
  303. endif
  304. config BR2_ENABLE_DEBUG
  305. bool "build packages with debugging symbols"
  306. help
  307. Build packages with debugging symbols enabled. All libraries
  308. and binaries in the 'staging' directory will have debugging
  309. symbols, which allows remote debugging even if libraries and
  310. binaries are stripped on the target. Whether libraries and
  311. binaries are stripped on the target is controlled by the
  312. BR2_STRIP_* options below.
  313. if BR2_ENABLE_DEBUG
  314. choice
  315. prompt "gcc debug level"
  316. default BR2_DEBUG_2
  317. help
  318. Set the debug level for gcc
  319. config BR2_DEBUG_1
  320. bool "debug level 1"
  321. help
  322. Debug level 1 produces minimal information, enough for making
  323. backtraces in parts of the program that you don't plan to
  324. debug. This includes descriptions of functions and external
  325. variables, but no information about local variables and no
  326. line numbers.
  327. config BR2_DEBUG_2
  328. bool "debug level 2"
  329. help
  330. The default gcc debug level is 2
  331. config BR2_DEBUG_3
  332. bool "debug level 3"
  333. help
  334. Level 3 includes extra information, such as all the macro
  335. definitions present in the program. Some debuggers support
  336. macro expansion when you use -g3.
  337. endchoice
  338. endif
  339. config BR2_STRIP_strip
  340. bool "strip target binaries"
  341. default y
  342. depends on !BR2_PACKAGE_HOST_ELF2FLT
  343. help
  344. Binaries and libraries in the target filesystem will be
  345. stripped using the normal 'strip' command. This allows to save
  346. space, mainly by removing debugging symbols. Debugging symbols
  347. on the target are needed for native debugging, but not when
  348. remote debugging is used.
  349. config BR2_STRIP_EXCLUDE_FILES
  350. string "executables that should not be stripped"
  351. default ""
  352. depends on BR2_STRIP_strip
  353. help
  354. You may specify a space-separated list of binaries and
  355. libraries here that should not be stripped on the target.
  356. config BR2_STRIP_EXCLUDE_DIRS
  357. string "directories that should be skipped when stripping"
  358. default ""
  359. depends on BR2_STRIP_strip
  360. help
  361. You may specify a space-separated list of directories that
  362. should be skipped when stripping. Binaries and libraries in
  363. these directories will not be touched. The directories should
  364. be specified relative to the target directory, without leading
  365. slash.
  366. choice
  367. prompt "gcc optimization level"
  368. default BR2_OPTIMIZE_S
  369. help
  370. Set the optimization level for gcc
  371. config BR2_OPTIMIZE_0
  372. bool "optimization level 0"
  373. help
  374. Do not optimize.
  375. config BR2_OPTIMIZE_1
  376. bool "optimization level 1"
  377. help
  378. Optimize. Optimizing compilation takes somewhat more time, and
  379. a lot more memory for a large function. With -O, the compiler
  380. tries to reduce code size and execution time, without
  381. performing any optimizations that take a great deal of
  382. compilation time. -O turns on the following optimization
  383. flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
  384. -fcprop-registers -floop-optimize -fif-conversion
  385. -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
  386. -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
  387. -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants. -O
  388. also turns on -fomit-frame-pointer on machines where doing so
  389. does not interfere with debugging.
  390. config BR2_OPTIMIZE_2
  391. bool "optimization level 2"
  392. help
  393. Optimize even more. GCC performs nearly all supported
  394. optimizations that do not involve a space-speed tradeoff. The
  395. compiler does not perform loop unrolling or function inlining
  396. when you specify -O2. As compared to -O, this option increases
  397. both compilation time and the performance of the generated
  398. code. -O2 turns on all optimization flags specified by -O. It
  399. also turns on the following optimization flags:
  400. -fthread-jumps -fcrossjumping -foptimize-sibling-calls
  401. -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
  402. -fexpensive-optimizations -fstrength-reduce
  403. -frerun-cse-after-loop -frerun-loop-opt -fcaller-saves
  404. -fpeephole2 -fschedule-insns -fschedule-insns2
  405. -fsched-interblock -fsched-spec -fregmove -fstrict-aliasing
  406. -fdelete-null-pointer-checks -freorder-blocks
  407. -freorder-functions -falign-functions -falign-jumps
  408. -falign-loops -falign-labels -ftree-vrp -ftree-pre. Please
  409. note the warning under -fgcse about invoking -O2 on programs
  410. that use computed gotos.
  411. config BR2_OPTIMIZE_3
  412. bool "optimization level 3"
  413. help
  414. Optimize yet more. -O3 turns on all optimizations specified by
  415. -O2 and also turns on the -finline-functions, -funswitch-loops
  416. and -fgcse-after-reload options.
  417. config BR2_OPTIMIZE_G
  418. bool "optimize for debugging"
  419. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
  420. help
  421. Optimize for debugging. This enables optimizations that do not
  422. interfere with debugging. It should be the optimization level
  423. of choice for the standard edit-compile-debug cycle, offering
  424. a reasonable level of optimization while maintaining fast
  425. compilation and a good debugging experience.
  426. config BR2_OPTIMIZE_S
  427. bool "optimize for size"
  428. help
  429. Optimize for size. -Os enables all -O2 optimizations that do
  430. not typically increase code size. It also performs further
  431. optimizations designed to reduce code size. -Os disables the
  432. following optimization flags: -falign-functions -falign-jumps
  433. -falign-loops -falign-labels -freorder-blocks
  434. -freorder-blocks-and-partition -fprefetch-loop-arrays
  435. -ftree-vect-loop-version
  436. This is the default.
  437. config BR2_OPTIMIZE_FAST
  438. bool "optimize for fast"
  439. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
  440. help
  441. Optimize for fast. Disregard strict standards
  442. compliance. -Ofast enables all -O3 optimizations. It also
  443. enables optimizations that are not valid for all
  444. standard-compliant programs. It turns on -ffast-math and the
  445. Fortran-specific -fstack-arrays, unless -fmax-stack-var-size
  446. is specified, and -fno-protect-parens.
  447. endchoice
  448. config BR2_GOOGLE_BREAKPAD_ENABLE
  449. bool "Enable google-breakpad support"
  450. depends on BR2_INSTALL_LIBSTDCPP
  451. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
  452. depends on BR2_USE_WCHAR
  453. depends on BR2_TOOLCHAIN_HAS_THREADS
  454. depends on (BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_UCLIBC)
  455. depends on BR2_PACKAGE_GOOGLE_BREAKPAD_ARCH_SUPPORTS
  456. depends on BR2_PACKAGE_HOST_GOOGLE_BREAKPAD_ARCH_SUPPORTS
  457. select BR2_PACKAGE_GOOGLE_BREAKPAD
  458. help
  459. This option will enable the use of google breakpad, a library
  460. and tool suite that allows you to distribute an application to
  461. users with compiler-provided debugging information removed,
  462. record crashes in compact "minidump" files, send them back to
  463. your server and produce C and C++ stack traces from these
  464. minidumps. Breakpad can also write minidumps on request for
  465. programs that have not crashed.
  466. if BR2_GOOGLE_BREAKPAD_ENABLE
  467. config BR2_GOOGLE_BREAKPAD_INCLUDE_FILES
  468. string "List of executables and libraries to extract symbols from"
  469. default ""
  470. help
  471. You may specify a space-separated list of binaries and
  472. libraries with full paths relative to $(TARGET_DIR) of which
  473. debug symbols will be dumped for further use with google
  474. breakpad.
  475. A directory structure that can be used by minidump-stackwalk
  476. will be created at:
  477. $(STAGING_DIR)/usr/share/google-breakpad-symbols
  478. endif
  479. choice
  480. bool "libraries"
  481. default BR2_SHARED_LIBS if BR2_BINFMT_SUPPORTS_SHARED
  482. default BR2_STATIC_LIBS if !BR2_BINFMT_SUPPORTS_SHARED
  483. help
  484. Select the type of libraries you want to use on the target.
  485. The default is to build dynamic libraries and use those on the
  486. target filesystem, except when the architecture and/or the
  487. selected binary format does not support shared libraries.
  488. config BR2_STATIC_LIBS
  489. bool "static only"
  490. help
  491. Build and use only static libraries. No shared libraries will
  492. be installed on the target. This potentially increases your
  493. code size and should only be used if you know what you are
  494. doing. Note that some packages may not be available when this
  495. option is enabled, due to their need for dynamic library
  496. support.
  497. config BR2_SHARED_LIBS
  498. bool "shared only"
  499. depends on BR2_BINFMT_SUPPORTS_SHARED
  500. help
  501. Build and use only shared libraries. This is the recommended
  502. solution as it saves space and build time.
  503. config BR2_SHARED_STATIC_LIBS
  504. bool "both static and shared"
  505. depends on BR2_BINFMT_SUPPORTS_SHARED
  506. help
  507. Build both shared and static libraries, but link executables
  508. dynamically. While building both shared and static libraries
  509. take more time and more disk space, having static libraries
  510. may be useful to link some of the applications statically.
  511. endchoice
  512. config BR2_PACKAGE_OVERRIDE_FILE
  513. string "location of a package override file"
  514. default "$(CONFIG_DIR)/local.mk"
  515. help
  516. A package override file is a short makefile that contains
  517. variable definitions of the form <pkg>_OVERRIDE_SRCDIR, which
  518. allows to tell Buildroot to use an existing directory as the
  519. source directory for a particular package. See the Buildroot
  520. documentation for more details on this feature.
  521. config BR2_GLOBAL_PATCH_DIR
  522. string "global patch directories"
  523. help
  524. You may specify a space separated list of one or more
  525. directories containing global package patches. For a specific
  526. version <packageversion> of a specific package <packagename>,
  527. patches are applied as follows:
  528. First, the default Buildroot patch set for the package is
  529. applied from the package's directory in Buildroot.
  530. Then for every directory - <global-patch-dir> - that exists in
  531. BR2_GLOBAL_PATCH_DIR, if the directory
  532. <global-patch-dir>/<packagename>/<packageversion>/ exists,
  533. then all *.patch files in this directory will be applied.
  534. Otherwise, if the directory <global-patch-dir>/<packagename>
  535. exists, then all *.patch files in the directory will be
  536. applied.
  537. menu "Advanced"
  538. config BR2_COMPILER_PARANOID_UNSAFE_PATH
  539. bool "paranoid check of library/header paths"
  540. default y
  541. help
  542. By default, when this option is disabled, when the Buildroot
  543. cross-compiler will encounter an unsafe library or header path
  544. (such as /usr/include, or /usr/lib), the compiler will display
  545. a warning.
  546. By enabling this option, this warning is turned into an error,
  547. which will completely abort the build when such unsafe paths
  548. are encountered.
  549. Note that this mechanism is available for both the internal
  550. toolchain (through the toolchain wrapper and binutils patches)
  551. and external toolchain backends (through the toolchain
  552. wrapper).
  553. config BR2_FORCE_HOST_BUILD
  554. bool "Force the building of host dependencies"
  555. help
  556. Build all available host dependencies, even if they are
  557. already installed on the system.
  558. This option can be used to ensure that the download cache of
  559. source archives for packages remain consistent between
  560. different build hosts.
  561. This option will increase build time.
  562. config BR2_REPRODUCIBLE
  563. bool "Make the build reproducible (experimental)"
  564. # SOURCE_DATE_EPOCH support in toolchain-wrapper requires GCC 4.4
  565. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
  566. help
  567. This option will remove all sources of non-reproducibility
  568. from the build process. For a given Buildroot configuration,
  569. this allows to generate exactly identical binaries from one
  570. build to the other, including on different machines.
  571. The current implementation is restricted to builds with the
  572. same output directory. Many (absolute) paths are recorded in
  573. intermediary files, and it is very likely that some of these
  574. paths leak into the target rootfs. If you build with the
  575. same O=... path, however, the result is identical.
  576. This is labeled as an experimental feature, as not all
  577. packages behave properly to ensure reproducibility.
  578. config BR2_PER_PACKAGE_DIRECTORIES
  579. bool "Use per-package directories (experimental)"
  580. help
  581. This option will change the build process of Buildroot
  582. package to use per-package target and host directories.
  583. This is useful for two related purposes:
  584. - Cleanly isolate the build of each package, so that a
  585. given package only "sees" the dependencies it has
  586. explicitly expressed, and not other packages that may
  587. have by chance been built before.
  588. - Enable top-level parallel build.
  589. This is labeled as an experimental feature, as not all
  590. packages behave properly with per-package directories.
  591. endmenu
  592. comment "Security Hardening Options"
  593. config BR2_PIC_PIE
  594. bool "Build code with PIC/PIE"
  595. depends on BR2_SHARED_LIBS
  596. depends on BR2_TOOLCHAIN_SUPPORTS_PIE
  597. help
  598. Generate Position-Independent Code (PIC) and link
  599. Position-Independent Executables (PIE).
  600. comment "PIC/PIE needs a toolchain w/ PIE"
  601. depends on BR2_SHARED_LIBS
  602. depends on !BR2_TOOLCHAIN_SUPPORTS_PIE
  603. choice
  604. bool "Stack Smashing Protection"
  605. default BR2_SSP_ALL if BR2_ENABLE_SSP # legacy
  606. depends on BR2_TOOLCHAIN_HAS_SSP
  607. help
  608. Enable stack smashing protection support using GCC's
  609. -fstack-protector option family.
  610. See
  611. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  612. for details.
  613. Note that this requires the toolchain to have SSP support.
  614. This is always the case for glibc and eglibc toolchain, but is
  615. optional in uClibc toolchains.
  616. config BR2_SSP_NONE
  617. bool "None"
  618. help
  619. Disable stack-smashing protection.
  620. config BR2_SSP_REGULAR
  621. bool "-fstack-protector"
  622. help
  623. Emit extra code to check for buffer overflows, such as stack
  624. smashing attacks. This is done by adding a guard variable to
  625. functions with vulnerable objects. This includes functions
  626. that call alloca, and functions with buffers larger than 8
  627. bytes. The guards are initialized when a function is entered
  628. and then checked when the function exits. If a guard check
  629. fails, an error message is printed and the program exits.
  630. config BR2_SSP_STRONG
  631. bool "-fstack-protector-strong"
  632. depends on BR2_TOOLCHAIN_HAS_SSP_STRONG
  633. help
  634. Like -fstack-protector but includes additional functions to be
  635. protected - those that have local array definitions, or have
  636. references to local frame addresses.
  637. -fstack-protector-strong officially appeared in gcc 4.9, but
  638. some vendors have backported -fstack-protector-strong to older
  639. versions of gcc.
  640. config BR2_SSP_ALL
  641. bool "-fstack-protector-all"
  642. help
  643. Like -fstack-protector except that all functions are
  644. protected. This option might have a significant performance
  645. impact on the compiled binaries.
  646. endchoice
  647. config BR2_SSP_OPTION
  648. string
  649. default "-fstack-protector" if BR2_SSP_REGULAR
  650. default "-fstack-protector-strong" if BR2_SSP_STRONG
  651. default "-fstack-protector-all" if BR2_SSP_ALL
  652. comment "Stack Smashing Protection needs a toolchain w/ SSP"
  653. depends on !BR2_TOOLCHAIN_HAS_SSP
  654. choice
  655. bool "RELRO Protection"
  656. depends on BR2_SHARED_LIBS
  657. help
  658. Enable a link-time protection know as RELRO (RELocation Read
  659. Only) which helps to protect from certain type of exploitation
  660. techniques altering the content of some ELF sections.
  661. config BR2_RELRO_NONE
  662. bool "None"
  663. help
  664. Disables Relocation link-time protections.
  665. config BR2_RELRO_PARTIAL
  666. bool "Partial"
  667. help
  668. This option makes the dynamic section not writeable after
  669. initialization (with almost no performance penalty).
  670. config BR2_RELRO_FULL
  671. bool "Full"
  672. depends on BR2_TOOLCHAIN_SUPPORTS_PIE
  673. select BR2_PIC_PIE
  674. help
  675. This option includes the partial configuration, but also marks
  676. the GOT as read-only at the cost of initialization time during
  677. program loading, i.e every time an executable is started.
  678. comment "RELRO Full needs a toolchain w/ PIE"
  679. depends on !BR2_TOOLCHAIN_SUPPORTS_PIE
  680. endchoice
  681. comment "RELocation Read Only (RELRO) needs shared libraries"
  682. depends on !BR2_SHARED_LIBS
  683. choice
  684. bool "Buffer-overflow Detection (FORTIFY_SOURCE)"
  685. depends on BR2_TOOLCHAIN_USES_GLIBC
  686. depends on !BR2_OPTIMIZE_0
  687. help
  688. Enable the _FORTIFY_SOURCE macro which introduces additional
  689. checks to detect buffer-overflows in the following standard
  690. library functions: memcpy, mempcpy, memmove, memset, strcpy,
  691. stpcpy, strncpy, strcat, strncat, sprintf, vsprintf, snprintf,
  692. vsnprintf, gets.
  693. NOTE: This feature requires an optimization level of s/1/2/3/g
  694. Support for this feature has been present since GCC 4.x.
  695. config BR2_FORTIFY_SOURCE_NONE
  696. bool "None"
  697. help
  698. Disables additional checks to detect buffer-overflows.
  699. config BR2_FORTIFY_SOURCE_1
  700. bool "Conservative"
  701. # gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61164
  702. depends on !BR2_TOOLCHAIN_BUILDROOT || BR2_TOOLCHAIN_GCC_AT_LEAST_6
  703. help
  704. This option sets _FORTIFY_SOURCE to 1 and only introduces
  705. checks that shouldn't change the behavior of conforming
  706. programs. Adds checks at compile-time only.
  707. config BR2_FORTIFY_SOURCE_2
  708. bool "Aggressive"
  709. # gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61164
  710. depends on !BR2_TOOLCHAIN_BUILDROOT || BR2_TOOLCHAIN_GCC_AT_LEAST_6
  711. help
  712. This option sets _FORTIFY_SOURCES to 2 and some more
  713. checking is added, but some conforming programs might fail.
  714. Also adds checks at run-time (detected buffer overflow
  715. terminates the program)
  716. endchoice
  717. comment "Fortify Source needs a glibc toolchain and optimization"
  718. depends on (!BR2_TOOLCHAIN_USES_GLIBC || BR2_OPTIMIZE_0)
  719. endmenu
  720. source "toolchain/Config.in"
  721. source "system/Config.in"
  722. source "linux/Config.in"
  723. source "package/Config.in"
  724. source "fs/Config.in"
  725. source "boot/Config.in"
  726. source "package/Config.in.host"
  727. source "Config.in.legacy"
  728. # br2-external menus definitions
  729. source "$BR2_BASE_DIR/.br2-external.in.menus"