3 mainmenu "Buildroot $BR2_VERSION Configuration"
5 config BR2_HAVE_DOT_CONFIG
11 option env="BR2_VERSION_FULL"
19 option env="BR2_EXTERNAL"
21 # Hidden boolean selected by packages in need of Java in order to build
23 config BR2_NEEDS_HOST_JAVA
26 # Hidden boolean selected by packages in need of javac in order to build
27 # (example: classpath)
28 config BR2_NEEDS_HOST_JAVAC
31 # Hidden boolean selected by packages in need of jar in order to build
32 # (example: classpath)
33 config BR2_NEEDS_HOST_JAR
36 # Hidden boolean selected by pre-built packages for x86, when they
37 # need to run on x86-64 machines (example: pre-built external
38 # toolchains, binary tools like SAM-BA, etc.).
39 config BR2_HOSTARCH_NEEDS_IA32_LIBS
42 # Hidden boolean selected by packages that need to build 32 bits
43 # binaries with the host compiler, even on 64 bits build machines (e.g
45 config BR2_HOSTARCH_NEEDS_IA32_COMPILER
48 source "arch/Config.in"
56 default "wget --passive-ftp -nd -t 3"
59 string "Subversion (svn) command"
63 string "Bazaar (bzr) command"
75 string "Local files retrieval command"
79 string "Secure copy (scp) command"
83 string "Secure shell (ssh) command"
87 string "Mercurial (hg) command"
94 Command to be used to extract a gzip'ed file to stdout.
95 zcat is identical to gunzip -c except that the former may
96 not be available on your system.
97 Default is "gzip -d -c"
98 Other possible values include "gunzip -c" or "zcat".
101 string "bzcat command"
104 Command to be used to extract a bzip2'ed file to stdout.
105 bzcat is identical to bunzip2 -c except that the former may
106 not be available on your system.
108 Other possible values include "bunzip2 -c" or "bzip2 -d -c".
111 string "xzcat command"
114 Command to be used to extract a xz'ed file to stdout.
117 config BR2_TAR_OPTIONS
121 Options to pass to tar when extracting the sources.
122 E.g. " -v --exclude='*.svn*'" to exclude all .svn internal files
127 config BR2_DEFCONFIG_FROM_ENV
129 option env="BR2_DEFCONFIG"
132 string "Location to save buildroot config"
133 default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
134 default "$(CONFIG_DIR)/defconfig"
136 When running 'make savedefconfig', the defconfig file will be saved
140 string "Download dir"
141 default "$(TOPDIR)/dl"
143 Directory to store all the source files that we need to fetch.
144 If the Linux shell environment has defined the BR2_DL_DIR
145 environment variable, then this overrides this configuration item.
147 The default is $(TOPDIR)/dl
151 default "$(BASE_DIR)/host"
153 Directory to store all the binary files that are built for the host.
154 This includes the cross compilation toolchain when building the
155 internal buildroot toolchain.
157 The default is $(BASE_DIR)/host
159 menu "Mirrors and Download locations"
161 config BR2_PRIMARY_SITE
162 string "Primary download site"
165 Primary site to download from. If this option is set then buildroot
166 will try to download package source first from this site and try the
167 default if the file is not found.
168 Valid URIs are URIs recognized by $(WGET) and scp URIs of the form
169 scp://[user@]host:path.
170 NOTE: This works for all packages using the central package
171 infrastructure (generic, autotools, cmake, ...)
173 config BR2_PRIMARY_SITE_ONLY
174 bool "Only allow downloads from primary download site"
175 depends on BR2_PRIMARY_SITE != ""
177 If this option is enabled, downloads will only be attempted
178 from the primary download site. Other locations, like the
179 package's official download location or the backup download
180 site, will not be considered. Therefore, if the package is
181 not present on the primary site, the download fails.
183 This is useful for project developers who want to ensure
184 that the project can be built even if the upstream tarball
187 if !BR2_PRIMARY_SITE_ONLY
189 config BR2_BACKUP_SITE
190 string "Backup download site"
191 default "http://sources.buildroot.net"
193 Backup site to download from. If this option is set then buildroot
194 will fall back to download package sources from here if the
195 normal location fails.
197 config BR2_KERNEL_MIRROR
198 string "Kernel.org mirror"
199 default "https://www.kernel.org/pub"
201 kernel.org is mirrored on a number of servers around the world.
202 The following allows you to select your preferred mirror.
204 Have a look on the kernel.org site for a list of mirrors, then enter
205 the URL to the base directory. Examples:
207 http://www.XX.kernel.org/pub (XX = country code)
208 http://mirror.aarnet.edu.au/pub/ftp.kernel.org
210 config BR2_GNU_MIRROR
211 string "GNU Software mirror"
212 default "http://ftp.gnu.org/pub/gnu"
214 GNU has multiple software mirrors scattered around the world.
215 The following allows you to select your preferred mirror.
217 Have a look on the gnu.org site for a list of mirrors, then enter
218 the URL to the base directory. Examples:
220 http://ftp.gnu.org/pub/gnu
221 http://mirror.aarnet.edu.au/pub/gnu
225 config BR2_LUAROCKS_MIRROR
226 string "LuaRocks mirror"
227 default "http://rocks.moonscript.org"
231 See http://luarocks.org
233 config BR2_CPAN_MIRROR
234 string "CPAN mirror (Perl packages)"
235 default "http://cpan.metacpan.org"
237 CPAN (Comprehensive Perl Archive Network) is a repository
238 of Perl packages. It has multiple software mirrors scattered
239 around the world. This option allows you to select a mirror.
241 The list of mirrors is available at:
242 http://search.cpan.org/mirror
247 int "Number of jobs to run simultaneously (0 for auto)"
250 Number of jobs to run simultaneously. If 0, determine
251 automatically according to number of CPUs on the host
255 bool "Enable compiler cache"
257 This option will enable the use of ccache, a compiler
258 cache. It will cache the result of previous builds to speed
259 up future builds. By default, the cache is stored in
260 $HOME/.buildroot-ccache.
262 Note that Buildroot does not try to invalidate the cache
263 contents when the compiler changes in an incompatible
264 way. Therefore, if you make a change to the compiler version
265 and/or configuration, you are responsible for purging the
266 ccache cache by removing the $HOME/.buildroot-ccache
271 config BR2_CCACHE_DIR
272 string "Compiler cache location"
273 default "$(HOME)/.buildroot-ccache"
275 Where ccache should store cached files.
277 config BR2_CCACHE_INITIAL_SETUP
278 string "Compiler cache initial setup"
280 Initial ccache settings to apply, such as --max-files or --max-size.
282 For example, if your project is known to require more space than the
283 default max cache size, then you might want to increase the cache size
284 to a suitable amount using the -M (--max-size) option.
286 The string you specify here is passed verbatim to ccache. Refer to
287 ccache documentation for more details.
289 These initial settings are applied after ccache has been compiled.
293 config BR2_DEPRECATED
294 bool "Show options and packages that are deprecated or obsolete"
296 This option shows outdated/obsolete versions of packages and
297 options that are otherwise hidden.
301 config BR2_DEPRECATED_SINCE_2014_02
305 config BR2_DEPRECATED_SINCE_2014_05
309 config BR2_DEPRECATED_SINCE_2014_08
313 config BR2_DEPRECATED_SINCE_2015_02
319 config BR2_ENABLE_DEBUG
320 bool "build packages with debugging symbols"
322 Build packages with debugging symbols enabled. All libraries
323 and binaries in the 'staging' directory will have debugging
324 symbols, which allows remote debugging even if libraries and
325 binaries are stripped on the target. Whether libraries and
326 binaries are stripped on the target is controlled by the
327 BR2_STRIP_* options below.
331 prompt "gcc debug level"
334 Set the debug level for gcc
339 Debug level 1 produces minimal information, enough
340 for making backtraces in parts of the program that
341 you don't plan to debug. This includes descriptions
342 of functions and external variables, but no information
343 about local variables and no line numbers.
348 The default gcc debug level is 2
353 Level 3 includes extra information, such as all the
354 macro definitions present in the program. Some debuggers
355 support macro expansion when you use -g3.
360 prompt "strip command for binaries on target"
361 default BR2_STRIP_strip
363 config BR2_STRIP_strip
365 depends on !BR2_PACKAGE_HOST_ELF2FLT
367 Binaries and libraries in the target filesystem will be
368 stripped using the normal 'strip' command. This allows to
369 save space, mainly by removing debugging symbols. Debugging
370 symbols on the target are needed for native debugging, but
371 not when remote debugging is used.
373 config BR2_STRIP_sstrip
375 select BR2_PACKAGE_SSTRIP_HOST
376 depends on !BR2_PACKAGE_HOST_ELF2FLT
377 depends on BR2_DEPRECATED_SINCE_2014_05
379 Binaries and libraries in the target filesystem will be
380 stripped using the 'sstrip' command, which strips a little
381 bit more than the traditional 'strip' command. This allows to
382 save space, mainly by removing debugging symbols. Debugging
383 symbols on the target are needed for native debugging, but
384 not when remote debugging is used.
386 config BR2_STRIP_none
389 Do not strip binaries and libraries in the target
393 config BR2_STRIP_EXCLUDE_FILES
394 string "executables that should not be stripped"
395 depends on !BR2_STRIP_none
398 You may specify a space-separated list of binaries and libraries
399 here that should not be stripped on the target.
401 config BR2_STRIP_EXCLUDE_DIRS
402 string "directories that should be skipped when stripping"
403 depends on !BR2_STRIP_none
406 You may specify a space-separated list of directories that should
407 be skipped when stripping. Binaries and libraries in these
408 directories will not be touched.
409 The directories should be specified relative to the target directory,
410 without leading slash.
413 prompt "gcc optimization level"
414 default BR2_OPTIMIZE_S
416 Set the optimization level for gcc
418 config BR2_OPTIMIZE_0
419 bool "optimization level 0"
421 Do not optimize. This is the default.
423 config BR2_OPTIMIZE_1
424 bool "optimization level 1"
426 Optimize. Optimizing compilation takes somewhat more time,
427 and a lot more memory for a large function. With -O, the
428 compiler tries to reduce code size and execution time,
429 without performing any optimizations that take a great deal
430 of compilation time. -O turns on the following optimization
431 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
432 -fcprop-registers -floop-optimize -fif-conversion
433 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
434 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
435 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
436 -O also turns on -fomit-frame-pointer on machines where doing
437 so does not interfere with debugging.
439 config BR2_OPTIMIZE_2
440 bool "optimization level 2"
442 Optimize even more. GCC performs nearly all supported optimizations
443 that do not involve a space-speed tradeoff. The compiler does not
444 perform loop unrolling or function inlining when you specify -O2.
445 As compared to -O, this option increases both compilation time and
446 the performance of the generated code. -O2 turns on all optimization
447 flags specified by -O. It also turns on the following optimization
448 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
449 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
450 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
451 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
452 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
453 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
454 -freorder-functions -falign-functions -falign-jumps -falign-loops
455 -falign-labels -ftree-vrp -ftree-pre
456 Please note the warning under -fgcse about invoking -O2 on programs
457 that use computed gotos.
459 config BR2_OPTIMIZE_3
460 bool "optimization level 3"
462 Optimize yet more. -O3 turns on all optimizations specified by -O2
463 and also turns on the -finline-functions, -funswitch-loops and
464 -fgcse-after-reload options.
466 config BR2_OPTIMIZE_S
467 bool "optimize for size"
469 Optimize for size. -Os enables all -O2 optimizations that do not
470 typically increase code size. It also performs further optimizations
471 designed to reduce code size. -Os disables the following optimization
472 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
473 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
474 -ftree-vect-loop-version
478 config BR2_GOOGLE_BREAKPAD_ENABLE
479 bool "Enable google-breakpad support"
480 select BR2_PACKAGE_GOOGLE_BREAKPAD
481 depends on BR2_INSTALL_LIBSTDCPP
482 depends on BR2_TOOLCHAIN_USES_GLIBC
483 depends on BR2_PACKAGE_GOOGLE_BREAKPAD_ARCH_SUPPORTS
485 This option will enable the use of google breakpad, a
486 library and tool suite that allows you to distribute an
487 application to users with compiler-provided debugging
488 information removed, record crashes in compact "minidump"
489 files, send them back to your server and produce C and C++
490 stack traces from these minidumps. Breakpad can also write
491 minidumps on request for programs that have not crashed.
493 if BR2_GOOGLE_BREAKPAD_ENABLE
495 config BR2_GOOGLE_BREAKPAD_INCLUDE_FILES
496 string "List of executables and libraries to extract symbols from"
499 You may specify a space-separated list of binaries and
500 libraries with full paths relative to $(TARGET_DIR) of which
501 debug symbols will be dumped for further use with google
504 A directory structure that can be used by minidump-stackwalk
507 $(STAGING_DIR)/usr/share/google-breakpad-symbols
511 config BR2_ENABLE_SSP
512 bool "build code with Stack Smashing Protection"
513 depends on BR2_TOOLCHAIN_HAS_SSP
515 Enable stack smashing protection support using GCCs
516 -fstack-protector-all option.
518 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
521 Note that this requires the toolchain to have SSP
522 support. This is always the case for glibc and eglibc
523 toolchain, but is optional in uClibc toolchains.
525 comment "enabling Stack Smashing Protection requires support in the toolchain"
526 depends on !BR2_TOOLCHAIN_HAS_SSP
530 default BR2_SHARED_LIBS if BR2_BINFMT_SUPPORTS_SHARED
531 default BR2_STATIC_LIBS if !BR2_BINFMT_SUPPORTS_SHARED
533 Select the type of libraries you want to use on the target.
535 The default is to build dynamic libraries and use those on
536 the target filesystem, except when the architecture and/or
537 the selected binary format does not support shared
540 config BR2_STATIC_LIBS
543 Build and use only static libraries. No shared libraries
544 will be instaled on the target. This potentially increases
545 your code size and should only be used if you know what you
546 are doing. Note that some packages may not be available when
547 this option is enabled, due to their need for dynamic
550 config BR2_SHARED_LIBS
552 depends on BR2_BINFMT_SUPPORTS_SHARED
554 Build and use only shared libraries. This is the recommended
555 solution as it saves space and build time.
557 config BR2_SHARED_STATIC_LIBS
558 bool "both static and shared"
559 depends on BR2_BINFMT_SUPPORTS_SHARED
561 Build both shared and static libraries, but link executables
562 dynamically. While building both shared and static libraries
563 take more time and more disk space, having static libraries
564 may be useful to link some of the applications statically.
569 config BR2_PACKAGE_OVERRIDE_FILE
570 string "location of a package override file"
571 default "$(CONFIG_DIR)/local.mk"
573 A package override file is a short makefile that contains
574 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
575 which allows to tell Buildroot to use an existing directory
576 as the source directory for a particular package. See the
577 Buildroot documentation for more details on this feature.
579 config BR2_GLOBAL_PATCH_DIR
580 string "global patch directories"
582 You may specify a space separated list of one or more directories
583 containing global package patches. For a specific version
584 <packageversion> of a specific package <packagename>, patches are
587 First, the default Buildroot patch set for the package is applied
588 from the package's directory in Buildroot.
590 Then for every directory - <global-patch-dir> - that exists in
591 BR2_GLOBAL_PATCH_DIR, if the directory
592 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
593 *.patch files in this directory will be applied.
595 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
596 then all *.patch files in the directory will be applied.
600 config BR2_COMPILER_PARANOID_UNSAFE_PATH
601 bool "paranoid check of library/header paths"
603 By default, when this option is disabled, when the Buildroot
604 cross-compiler will encounter an unsafe library or header
605 path (such as /usr/include, or /usr/lib), the compiler will
608 By enabling this option, this warning is turned into an
609 error, which will completely abort the build when such
610 unsafe paths are encountered.
612 Note that this mechanism is available for both the internal
613 toolchain (through gcc and binutils patches) and external
614 toolchain backends (through the external toolchain wrapper).
620 source "toolchain/Config.in"
622 source "system/Config.in"
624 source "linux/Config.in"
626 source "package/Config.in"
628 source "fs/Config.in"
630 source "boot/Config.in"
632 source "package/Config.in.host"
634 source "Config.in.legacy"
636 menu "User-provided options"
637 depends on BR2_EXTERNAL != "support/dummy-external"
639 source "$BR2_EXTERNAL/Config.in"