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. config BR2_HOST_GCC_AT_LEAST_8
  51. bool
  52. default y if BR2_HOST_GCC_VERSION = "8"
  53. select BR2_HOST_GCC_AT_LEAST_7
  54. # When adding new entries above, be sure to update
  55. # the HOSTCC_MAX_VERSION variable in the Makefile.
  56. # Hidden boolean selected by packages in need of Java in order to build
  57. # (example: kodi)
  58. config BR2_NEEDS_HOST_JAVA
  59. bool
  60. # Hidden boolean selected by packages in need of javac in order to build
  61. # (example: classpath)
  62. config BR2_NEEDS_HOST_JAVAC
  63. bool
  64. # Hidden boolean selected by packages in need of jar in order to build
  65. # (example: classpath)
  66. config BR2_NEEDS_HOST_JAR
  67. bool
  68. # Hidden boolean selected by pre-built packages for x86, when they
  69. # need to run on x86-64 machines (example: pre-built external
  70. # toolchains, binary tools like SAM-BA, etc.).
  71. config BR2_HOSTARCH_NEEDS_IA32_LIBS
  72. bool
  73. # Hidden boolean selected by packages that need to build 32 bits
  74. # binaries with the host compiler, even on 64 bits build machines (e.g
  75. # bootloaders).
  76. config BR2_HOSTARCH_NEEDS_IA32_COMPILER
  77. bool
  78. # Hidden boolean selected by packages that need the host to have an
  79. # UTF8 locale.
  80. config BR2_NEEDS_HOST_UTF8_LOCALE
  81. bool
  82. source "arch/Config.in"
  83. menu "Build options"
  84. menu "Commands"
  85. config BR2_WGET
  86. string "Wget command"
  87. default "wget --passive-ftp -nd -t 3"
  88. config BR2_SVN
  89. string "Subversion (svn) command"
  90. default "svn --non-interactive"
  91. config BR2_BZR
  92. string "Bazaar (bzr) command"
  93. default "bzr"
  94. config BR2_GIT
  95. string "Git command"
  96. default "git"
  97. config BR2_CVS
  98. string "CVS command"
  99. default "cvs"
  100. config BR2_LOCALFILES
  101. string "Local files retrieval command"
  102. default "cp"
  103. config BR2_SCP
  104. string "Secure copy (scp) command"
  105. default "scp"
  106. config BR2_SSH
  107. string "Secure shell (ssh) command"
  108. default "ssh"
  109. config BR2_HG
  110. string "Mercurial (hg) command"
  111. default "hg"
  112. config BR2_ZCAT
  113. string "zcat command"
  114. default "gzip -d -c"
  115. help
  116. Command to be used to extract a gzip'ed file to stdout. zcat
  117. is identical to gunzip -c except that the former may not be
  118. available on your system.
  119. Default is "gzip -d -c"
  120. Other possible values include "gunzip -c" or "zcat".
  121. config BR2_BZCAT
  122. string "bzcat command"
  123. default "bzcat"
  124. help
  125. Command to be used to extract a bzip2'ed file to stdout.
  126. bzcat is identical to bunzip2 -c except that the former may
  127. not be available on your system.
  128. Default is "bzcat"
  129. Other possible values include "bunzip2 -c" or "bzip2 -d -c".
  130. config BR2_XZCAT
  131. string "xzcat command"
  132. default "xzcat"
  133. help
  134. Command to be used to extract a xz'ed file to stdout.
  135. Default is "xzcat"
  136. config BR2_LZCAT
  137. string "lzcat command"
  138. default "lzip -d -c"
  139. help
  140. Command to be used to extract a lzip'ed file to stdout.
  141. Default is "lzip -d -c"
  142. config BR2_TAR_OPTIONS
  143. string "Tar options"
  144. default ""
  145. help
  146. Options to pass to tar when extracting the sources.
  147. E.g. " -v --exclude='*.svn*'" to exclude all .svn internal
  148. files and to be verbose.
  149. endmenu
  150. config BR2_DEFCONFIG_FROM_ENV
  151. string
  152. option env="BR2_DEFCONFIG"
  153. config BR2_DEFCONFIG
  154. string "Location to save buildroot config"
  155. default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
  156. default "$(CONFIG_DIR)/defconfig"
  157. help
  158. When running 'make savedefconfig', the defconfig file will be
  159. saved in this location.
  160. config BR2_DL_DIR
  161. string "Download dir"
  162. default "$(TOPDIR)/dl"
  163. help
  164. Directory to store all the source files that we need to fetch.
  165. If the Linux shell environment has defined the BR2_DL_DIR
  166. environment variable, then this overrides this configuration
  167. item.
  168. The directory is organized with a subdirectory for each
  169. package. Each package has its own $(LIBFOO_DL_DIR) variable
  170. that can be used to find the correct path.
  171. The default is $(TOPDIR)/dl
  172. config BR2_HOST_DIR
  173. string "Host dir"
  174. default "$(BASE_DIR)/host"
  175. help
  176. Directory to store all the binary files that are built for the
  177. host. This includes the cross compilation toolchain when
  178. building the internal buildroot toolchain.
  179. The default is $(BASE_DIR)/host
  180. menu "Mirrors and Download locations"
  181. config BR2_PRIMARY_SITE
  182. string "Primary download site"
  183. default ""
  184. help
  185. Primary site to download from. If this option is set then
  186. buildroot will try to download package source first from this
  187. site and try the default if the file is not found.
  188. Valid URIs are:
  189. - URIs recognized by $(WGET)
  190. - local URIs of the form file://absolutepath
  191. - scp URIs of the form scp://[user@]host:path.
  192. config BR2_PRIMARY_SITE_ONLY
  193. bool "Only allow downloads from primary download site"
  194. depends on BR2_PRIMARY_SITE != ""
  195. help
  196. If this option is enabled, downloads will only be attempted
  197. from the primary download site. Other locations, like the
  198. package's official download location or the backup download
  199. site, will not be considered. Therefore, if the package is not
  200. present on the primary site, the download fails.
  201. This is useful for project developers who want to ensure that
  202. the project can be built even if the upstream tarball
  203. locations disappear.
  204. if !BR2_PRIMARY_SITE_ONLY
  205. config BR2_BACKUP_SITE
  206. string "Backup download site"
  207. default "http://sources.buildroot.net"
  208. help
  209. Backup site to download from. If this option is set then
  210. buildroot will fall back to download package sources from here
  211. if the normal location fails.
  212. config BR2_KERNEL_MIRROR
  213. string "Kernel.org mirror"
  214. default "https://cdn.kernel.org/pub"
  215. help
  216. kernel.org is mirrored on a number of servers around the
  217. world. The following allows you to select your preferred
  218. mirror. By default, a CDN is used, which automatically
  219. redirects to a mirror geographically close to you.
  220. Have a look on the kernel.org site for a list of mirrors, then
  221. enter the URL to the base directory. Examples:
  222. http://www.XX.kernel.org/pub (XX = country code)
  223. http://mirror.aarnet.edu.au/pub/ftp.kernel.org
  224. config BR2_GNU_MIRROR
  225. string "GNU Software mirror"
  226. default "http://ftpmirror.gnu.org"
  227. help
  228. GNU has multiple software mirrors scattered around the
  229. world. The following allows you to select your preferred
  230. mirror. By default, a generic address is used, which
  231. automatically selects an up-to-date and local mirror.
  232. Have a look on the gnu.org site for a list of mirrors, then
  233. enter the URL to the base directory. Examples:
  234. http://ftp.gnu.org/pub/gnu
  235. http://mirror.aarnet.edu.au/pub/gnu
  236. config BR2_LUAROCKS_MIRROR
  237. string "LuaRocks mirror"
  238. default "http://rocks.moonscript.org"
  239. help
  240. LuaRocks repository.
  241. See http://luarocks.org
  242. config BR2_CPAN_MIRROR
  243. string "CPAN mirror (Perl packages)"
  244. default "http://cpan.metacpan.org"
  245. help
  246. CPAN (Comprehensive Perl Archive Network) is a repository of
  247. Perl packages. It has multiple software mirrors scattered
  248. around the world. This option allows you to select a mirror.
  249. The list of mirrors is available at:
  250. http://search.cpan.org/mirror
  251. endif
  252. endmenu
  253. config BR2_JLEVEL
  254. int "Number of jobs to run simultaneously (0 for auto)"
  255. default "0"
  256. help
  257. Number of jobs to run simultaneously. If 0, determine
  258. automatically according to number of CPUs on the host system.
  259. config BR2_CCACHE
  260. bool "Enable compiler cache"
  261. help
  262. This option will enable the use of ccache, a compiler cache.
  263. It will cache the result of previous builds to speed up future
  264. builds. By default, the cache is stored in
  265. $HOME/.buildroot-ccache.
  266. Note that Buildroot does not try to invalidate the cache
  267. contents when the compiler changes in an incompatible way.
  268. Therefore, if you make a change to the compiler version and/or
  269. configuration, you are responsible for purging the ccache
  270. cache by removing the $HOME/.buildroot-ccache directory.
  271. if BR2_CCACHE
  272. config BR2_CCACHE_DIR
  273. string "Compiler cache location"
  274. default "$(HOME)/.buildroot-ccache"
  275. help
  276. Where ccache should store cached files.
  277. If the Linux shell environment has defined the BR2_CCACHE_DIR
  278. environment variable, then this overrides this configuration
  279. item.
  280. config BR2_CCACHE_INITIAL_SETUP
  281. string "Compiler cache initial setup"
  282. help
  283. Initial ccache settings to apply, such as --max-files or
  284. --max-size.
  285. For example, if your project is known to require more space
  286. than the default max cache size, then you might want to
  287. increase the cache size to a suitable amount using the -M
  288. (--max-size) option.
  289. The string you specify here is passed verbatim to ccache.
  290. Refer to ccache documentation for more details.
  291. These initial settings are applied after ccache has been
  292. compiled.
  293. config BR2_CCACHE_USE_BASEDIR
  294. bool "Use relative paths"
  295. default y
  296. help
  297. Allow ccache to convert absolute paths within the output
  298. directory into relative paths.
  299. During the build, many -I include directives are given with an
  300. absolute path. These absolute paths end up in the hashes that
  301. are computed by ccache. Therefore, when you build from a
  302. different directory, the hash will be different and the cached
  303. object will not be used.
  304. To improve cache performance, set this option to y. This
  305. allows ccache to rewrite absolute paths within the output
  306. directory into relative paths. Note that only paths within the
  307. output directory will be rewritten; therefore, if you change
  308. BR2_HOST_DIR to point outside the output directory and
  309. subsequently move it to a different location, this will lead
  310. to cache misses.
  311. This option has as a result that the debug information in the
  312. object files also has only relative paths. Therefore, make
  313. sure you cd to the build directory before starting gdb. See
  314. the section "COMPILING IN DIFFERENT DIRECTORIES" in the ccache
  315. manual for more information.
  316. endif
  317. config BR2_ENABLE_DEBUG
  318. bool "build packages with debugging symbols"
  319. help
  320. Build packages with debugging symbols enabled. All libraries
  321. and binaries in the 'staging' directory will have debugging
  322. symbols, which allows remote debugging even if libraries and
  323. binaries are stripped on the target. Whether libraries and
  324. binaries are stripped on the target is controlled by the
  325. BR2_STRIP_* options below.
  326. if BR2_ENABLE_DEBUG
  327. choice
  328. prompt "gcc debug level"
  329. default BR2_DEBUG_2
  330. help
  331. Set the debug level for gcc
  332. config BR2_DEBUG_1
  333. bool "debug level 1"
  334. help
  335. Debug level 1 produces minimal information, enough for making
  336. backtraces in parts of the program that you don't plan to
  337. debug. This includes descriptions of functions and external
  338. variables, but no information about local variables and no
  339. line numbers.
  340. config BR2_DEBUG_2
  341. bool "debug level 2"
  342. help
  343. The default gcc debug level is 2
  344. config BR2_DEBUG_3
  345. bool "debug level 3"
  346. help
  347. Level 3 includes extra information, such as all the macro
  348. definitions present in the program. Some debuggers support
  349. macro expansion when you use -g3.
  350. endchoice
  351. endif
  352. config BR2_STRIP_strip
  353. bool "strip target binaries"
  354. default y
  355. depends on !BR2_PACKAGE_HOST_ELF2FLT
  356. help
  357. Binaries and libraries in the target filesystem will be
  358. stripped using the normal 'strip' command. This allows to save
  359. space, mainly by removing debugging symbols. Debugging symbols
  360. on the target are needed for native debugging, but not when
  361. remote debugging is used.
  362. config BR2_STRIP_EXCLUDE_FILES
  363. string "executables that should not be stripped"
  364. default ""
  365. depends on BR2_STRIP_strip
  366. help
  367. You may specify a space-separated list of binaries and
  368. libraries here that should not be stripped on the target.
  369. config BR2_STRIP_EXCLUDE_DIRS
  370. string "directories that should be skipped when stripping"
  371. default ""
  372. depends on BR2_STRIP_strip
  373. help
  374. You may specify a space-separated list of directories that
  375. should be skipped when stripping. Binaries and libraries in
  376. these directories will not be touched. The directories should
  377. be specified relative to the target directory, without leading
  378. slash.
  379. choice
  380. prompt "gcc optimization level"
  381. default BR2_OPTIMIZE_S
  382. help
  383. Set the optimization level for gcc
  384. config BR2_OPTIMIZE_0
  385. bool "optimization level 0"
  386. help
  387. Do not optimize.
  388. config BR2_OPTIMIZE_1
  389. bool "optimization level 1"
  390. help
  391. Optimize. Optimizing compilation takes somewhat more time, and
  392. a lot more memory for a large function. With -O, the compiler
  393. tries to reduce code size and execution time, without
  394. performing any optimizations that take a great deal of
  395. compilation time. -O turns on the following optimization
  396. flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
  397. -fcprop-registers -floop-optimize -fif-conversion
  398. -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
  399. -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
  400. -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants. -O
  401. also turns on -fomit-frame-pointer on machines where doing so
  402. does not interfere with debugging.
  403. config BR2_OPTIMIZE_2
  404. bool "optimization level 2"
  405. help
  406. Optimize even more. GCC performs nearly all supported
  407. optimizations that do not involve a space-speed tradeoff. The
  408. compiler does not perform loop unrolling or function inlining
  409. when you specify -O2. As compared to -O, this option increases
  410. both compilation time and the performance of the generated
  411. code. -O2 turns on all optimization flags specified by -O. It
  412. also turns on the following optimization flags:
  413. -fthread-jumps -fcrossjumping -foptimize-sibling-calls
  414. -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
  415. -fexpensive-optimizations -fstrength-reduce
  416. -frerun-cse-after-loop -frerun-loop-opt -fcaller-saves
  417. -fpeephole2 -fschedule-insns -fschedule-insns2
  418. -fsched-interblock -fsched-spec -fregmove -fstrict-aliasing
  419. -fdelete-null-pointer-checks -freorder-blocks
  420. -freorder-functions -falign-functions -falign-jumps
  421. -falign-loops -falign-labels -ftree-vrp -ftree-pre. Please
  422. note the warning under -fgcse about invoking -O2 on programs
  423. that use computed gotos.
  424. config BR2_OPTIMIZE_3
  425. bool "optimization level 3"
  426. help
  427. Optimize yet more. -O3 turns on all optimizations specified by
  428. -O2 and also turns on the -finline-functions, -funswitch-loops
  429. and -fgcse-after-reload options.
  430. config BR2_OPTIMIZE_G
  431. bool "optimize for debugging"
  432. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
  433. help
  434. Optimize for debugging. This enables optimizations that do not
  435. interfere with debugging. It should be the optimization level
  436. of choice for the standard edit-compile-debug cycle, offering
  437. a reasonable level of optimization while maintaining fast
  438. compilation and a good debugging experience.
  439. config BR2_OPTIMIZE_S
  440. bool "optimize for size"
  441. help
  442. Optimize for size. -Os enables all -O2 optimizations that do
  443. not typically increase code size. It also performs further
  444. optimizations designed to reduce code size. -Os disables the
  445. following optimization flags: -falign-functions -falign-jumps
  446. -falign-loops -falign-labels -freorder-blocks
  447. -freorder-blocks-and-partition -fprefetch-loop-arrays
  448. -ftree-vect-loop-version
  449. This is the default.
  450. config BR2_OPTIMIZE_FAST
  451. bool "optimize for fast"
  452. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
  453. help
  454. Optimize for fast. Disregard strict standards
  455. compliance. -Ofast enables all -O3 optimizations. It also
  456. enables optimizations that are not valid for all
  457. standard-compliant programs. It turns on -ffast-math and the
  458. Fortran-specific -fstack-arrays, unless -fmax-stack-var-size
  459. is specified, and -fno-protect-parens.
  460. endchoice
  461. config BR2_GOOGLE_BREAKPAD_ENABLE
  462. bool "Enable google-breakpad support"
  463. depends on BR2_INSTALL_LIBSTDCPP
  464. depends on BR2_HOST_GCC_AT_LEAST_4_8 # C++11
  465. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
  466. depends on BR2_USE_WCHAR
  467. depends on BR2_TOOLCHAIN_HAS_THREADS
  468. depends on (BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_UCLIBC)
  469. depends on BR2_PACKAGE_GOOGLE_BREAKPAD_ARCH_SUPPORTS
  470. depends on BR2_PACKAGE_HOST_GOOGLE_BREAKPAD_ARCH_SUPPORTS
  471. select BR2_PACKAGE_GOOGLE_BREAKPAD
  472. help
  473. This option will enable the use of google breakpad, a library
  474. and tool suite that allows you to distribute an application to
  475. users with compiler-provided debugging information removed,
  476. record crashes in compact "minidump" files, send them back to
  477. your server and produce C and C++ stack traces from these
  478. minidumps. Breakpad can also write minidumps on request for
  479. programs that have not crashed.
  480. if BR2_GOOGLE_BREAKPAD_ENABLE
  481. config BR2_GOOGLE_BREAKPAD_INCLUDE_FILES
  482. string "List of executables and libraries to extract symbols from"
  483. default ""
  484. help
  485. You may specify a space-separated list of binaries and
  486. libraries with full paths relative to $(TARGET_DIR) of which
  487. debug symbols will be dumped for further use with google
  488. breakpad.
  489. A directory structure that can be used by minidump-stackwalk
  490. will be created at:
  491. $(STAGING_DIR)/usr/share/google-breakpad-symbols
  492. endif
  493. choice
  494. bool "libraries"
  495. default BR2_SHARED_LIBS if BR2_BINFMT_SUPPORTS_SHARED
  496. default BR2_STATIC_LIBS if !BR2_BINFMT_SUPPORTS_SHARED
  497. help
  498. Select the type of libraries you want to use on the target.
  499. The default is to build dynamic libraries and use those on the
  500. target filesystem, except when the architecture and/or the
  501. selected binary format does not support shared libraries.
  502. config BR2_STATIC_LIBS
  503. bool "static only"
  504. help
  505. Build and use only static libraries. No shared libraries will
  506. be installed on the target. This potentially increases your
  507. code size and should only be used if you know what you are
  508. doing. Note that some packages may not be available when this
  509. option is enabled, due to their need for dynamic library
  510. support.
  511. config BR2_SHARED_LIBS
  512. bool "shared only"
  513. depends on BR2_BINFMT_SUPPORTS_SHARED
  514. help
  515. Build and use only shared libraries. This is the recommended
  516. solution as it saves space and build time.
  517. config BR2_SHARED_STATIC_LIBS
  518. bool "both static and shared"
  519. depends on BR2_BINFMT_SUPPORTS_SHARED
  520. help
  521. Build both shared and static libraries, but link executables
  522. dynamically. While building both shared and static libraries
  523. take more time and more disk space, having static libraries
  524. may be useful to link some of the applications statically.
  525. endchoice
  526. config BR2_PACKAGE_OVERRIDE_FILE
  527. string "location of a package override file"
  528. default "$(CONFIG_DIR)/local.mk"
  529. help
  530. A package override file is a short makefile that contains
  531. variable definitions of the form <pkg>_OVERRIDE_SRCDIR, which
  532. allows to tell Buildroot to use an existing directory as the
  533. source directory for a particular package. See the Buildroot
  534. documentation for more details on this feature.
  535. config BR2_GLOBAL_PATCH_DIR
  536. string "global patch directories"
  537. help
  538. You may specify a space separated list of one or more
  539. directories containing global package patches. For a specific
  540. version <packageversion> of a specific package <packagename>,
  541. patches are applied as follows:
  542. First, the default Buildroot patch set for the package is
  543. applied from the package's directory in Buildroot.
  544. Then for every directory - <global-patch-dir> - that exists in
  545. BR2_GLOBAL_PATCH_DIR, if the directory
  546. <global-patch-dir>/<packagename>/<packageversion>/ exists,
  547. then all *.patch files in this directory will be applied.
  548. Otherwise, if the directory <global-patch-dir>/<packagename>
  549. exists, then all *.patch files in the directory will be
  550. applied.
  551. menu "Advanced"
  552. config BR2_COMPILER_PARANOID_UNSAFE_PATH
  553. bool "paranoid check of library/header paths"
  554. default y
  555. help
  556. By default, when this option is disabled, when the Buildroot
  557. cross-compiler will encounter an unsafe library or header path
  558. (such as /usr/include, or /usr/lib), the compiler will display
  559. a warning.
  560. By enabling this option, this warning is turned into an error,
  561. which will completely abort the build when such unsafe paths
  562. are encountered.
  563. Note that this mechanism is available for both the internal
  564. toolchain (through the toolchain wrapper and binutils patches)
  565. and external toolchain backends (through the toolchain
  566. wrapper).
  567. config BR2_REPRODUCIBLE
  568. bool "Make the build reproducible (experimental)"
  569. # SOURCE_DATE_EPOCH support in toolchain-wrapper requires GCC 4.4
  570. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
  571. help
  572. This option will remove all sources of non-reproducibility
  573. from the build process. For a given Buildroot configuration,
  574. this allows to generate exactly identical binaries from one
  575. build to the other, including on different machines.
  576. The current implementation is restricted to builds with the
  577. same output directory. Many (absolute) paths are recorded in
  578. intermediary files, and it is very likely that some of these
  579. paths leak into the target rootfs. If you build with the
  580. same O=... path, however, the result is identical.
  581. This is labeled as an experimental feature, as not all
  582. packages behave properly to ensure reproducibility.
  583. endmenu
  584. comment "Security Hardening Options"
  585. choice
  586. bool "Stack Smashing Protection"
  587. default BR2_SSP_ALL if BR2_ENABLE_SSP # legacy
  588. depends on BR2_TOOLCHAIN_HAS_SSP
  589. help
  590. Enable stack smashing protection support using GCC's
  591. -fstack-protector option family.
  592. See
  593. http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
  594. for details.
  595. Note that this requires the toolchain to have SSP support.
  596. This is always the case for glibc and eglibc toolchain, but is
  597. optional in uClibc toolchains.
  598. config BR2_SSP_NONE
  599. bool "None"
  600. help
  601. Disable stack-smashing protection.
  602. config BR2_SSP_REGULAR
  603. bool "-fstack-protector"
  604. help
  605. Emit extra code to check for buffer overflows, such as stack
  606. smashing attacks. This is done by adding a guard variable to
  607. functions with vulnerable objects. This includes functions
  608. that call alloca, and functions with buffers larger than 8
  609. bytes. The guards are initialized when a function is entered
  610. and then checked when the function exits. If a guard check
  611. fails, an error message is printed and the program exits.
  612. config BR2_SSP_STRONG
  613. bool "-fstack-protector-strong"
  614. depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
  615. help
  616. Like -fstack-protector but includes additional functions to be
  617. protected - those that have local array definitions, or have
  618. references to local frame addresses.
  619. comment "Stack Smashing Protection strong needs a toolchain w/ gcc >= 4.9"
  620. depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
  621. config BR2_SSP_ALL
  622. bool "-fstack-protector-all"
  623. help
  624. Like -fstack-protector except that all functions are
  625. protected. This option might have a significant performance
  626. impact on the compiled binaries.
  627. endchoice
  628. comment "Stack Smashing Protection needs a toolchain w/ SSP"
  629. depends on !BR2_TOOLCHAIN_HAS_SSP
  630. choice
  631. bool "RELRO Protection"
  632. depends on BR2_SHARED_LIBS
  633. help
  634. Enable a link-time protection know as RELRO (RELocation Read
  635. Only) which helps to protect from certain type of exploitation
  636. techniques altering the content of some ELF sections.
  637. config BR2_RELRO_NONE
  638. bool "None"
  639. help
  640. Disables Relocation link-time protections.
  641. config BR2_RELRO_PARTIAL
  642. bool "Partial"
  643. help
  644. This option makes the dynamic section not writeable after
  645. initialization (with almost no performance penalty).
  646. config BR2_RELRO_FULL
  647. bool "Full"
  648. help
  649. This option includes the partial configuration, but also marks
  650. the GOT as read-only at the cost of initialization time during
  651. program loading, i.e every time an executable is started.
  652. endchoice
  653. comment "RELocation Read Only (RELRO) needs shared libraries"
  654. depends on !BR2_SHARED_LIBS
  655. choice
  656. bool "Buffer-overflow Detection (FORTIFY_SOURCE)"
  657. depends on BR2_TOOLCHAIN_USES_GLIBC
  658. depends on !BR2_OPTIMIZE_0
  659. help
  660. Enable the _FORTIFY_SOURCE macro which introduces additional
  661. checks to detect buffer-overflows in the following standard
  662. library functions: memcpy, mempcpy, memmove, memset, strcpy,
  663. stpcpy, strncpy, strcat, strncat, sprintf, vsprintf, snprintf,
  664. vsnprintf, gets.
  665. NOTE: This feature requires an optimization level of s/1/2/3/g
  666. Support for this feature has been present since GCC 4.x.
  667. config BR2_FORTIFY_SOURCE_NONE
  668. bool "None"
  669. help
  670. Disables additional checks to detect buffer-overflows.
  671. config BR2_FORTIFY_SOURCE_1
  672. bool "Conservative"
  673. # gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61164
  674. depends on !BR2_TOOLCHAIN_BUILDROOT || BR2_TOOLCHAIN_GCC_AT_LEAST_6
  675. help
  676. This option sets _FORTIFY_SOURCE to 1 and only introduces
  677. checks that shouldn't change the behavior of conforming
  678. programs. Adds checks at compile-time only.
  679. config BR2_FORTIFY_SOURCE_2
  680. bool "Aggressive"
  681. # gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61164
  682. depends on !BR2_TOOLCHAIN_BUILDROOT || BR2_TOOLCHAIN_GCC_AT_LEAST_6
  683. help
  684. This option sets _FORTIFY_SOURCES to 2 and some more
  685. checking is added, but some conforming programs might fail.
  686. Also adds checks at run-time (detected buffer overflow
  687. terminates the program)
  688. endchoice
  689. comment "Fortify Source needs a glibc toolchain and optimization"
  690. depends on (!BR2_TOOLCHAIN_USES_GLIBC || BR2_OPTIMIZE_0)
  691. endmenu
  692. source "toolchain/Config.in"
  693. source "system/Config.in"
  694. source "linux/Config.in"
  695. source "package/Config.in"
  696. source "fs/Config.in"
  697. source "boot/Config.in"
  698. source "package/Config.in.host"
  699. source "Config.in.legacy"
  700. source "$BR2_BUILD_DIR/.br2-external.in"