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