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.
169 - URIs recognized by $(WGET)
170 - local URIs of the form file://absolutepath
171 - scp URIs of the form scp://[user@]host:path.
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
223 config BR2_LUAROCKS_MIRROR
224 string "LuaRocks mirror"
225 default "http://rocks.moonscript.org"
229 See http://luarocks.org
231 config BR2_CPAN_MIRROR
232 string "CPAN mirror (Perl packages)"
233 default "http://cpan.metacpan.org"
235 CPAN (Comprehensive Perl Archive Network) is a repository
236 of Perl packages. It has multiple software mirrors scattered
237 around the world. This option allows you to select a mirror.
239 The list of mirrors is available at:
240 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.
291 config BR2_CCACHE_USE_BASEDIR
292 bool "Use relative paths"
295 Allow ccache to convert absolute paths within the output
296 directory into relative paths.
298 During the build, many -I include directives are given with
299 an absolute path. These absolute paths end up in the hashes
300 that are computed by ccache. Therefore, when you build from a
301 different directory, the hash will be different and the
302 cached 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
307 the output directory will be rewritten; therefore, if you
308 change BR2_HOST_DIR to point outside the output directory and
309 subsequently move it to a different location, this will lead
312 This option has as a result that the debug information in the
313 object files also has only relative paths. Therefore, make
314 sure you cd to the build directory before starting gdb. See
315 the section "COMPILING IN DIFFERENT DIRECTORIES" in the
316 ccache manual for more information.
320 config BR2_DEPRECATED
321 bool "Show options and packages that are deprecated or obsolete"
323 This option shows outdated/obsolete versions of packages and
324 options that are otherwise hidden.
328 config BR2_DEPRECATED_SINCE_2015_02
332 config BR2_DEPRECATED_SINCE_2015_05
336 config BR2_DEPRECATED_SINCE_2015_08
342 config BR2_ENABLE_DEBUG
343 bool "build packages with debugging symbols"
345 Build packages with debugging symbols enabled. All libraries
346 and binaries in the 'staging' directory will have debugging
347 symbols, which allows remote debugging even if libraries and
348 binaries are stripped on the target. Whether libraries and
349 binaries are stripped on the target is controlled by the
350 BR2_STRIP_* options below.
354 prompt "gcc debug level"
357 Set the debug level for gcc
362 Debug level 1 produces minimal information, enough
363 for making backtraces in parts of the program that
364 you don't plan to debug. This includes descriptions
365 of functions and external variables, but no information
366 about local variables and no line numbers.
371 The default gcc debug level is 2
376 Level 3 includes extra information, such as all the
377 macro definitions present in the program. Some debuggers
378 support macro expansion when you use -g3.
383 prompt "strip command for binaries on target"
384 default BR2_STRIP_strip
386 config BR2_STRIP_strip
388 depends on !BR2_PACKAGE_HOST_ELF2FLT
390 Binaries and libraries in the target filesystem will be
391 stripped using the normal 'strip' command. This allows to
392 save space, mainly by removing debugging symbols. Debugging
393 symbols on the target are needed for native debugging, but
394 not when remote debugging is used.
396 config BR2_STRIP_none
399 Do not strip binaries and libraries in the target
403 config BR2_STRIP_EXCLUDE_FILES
404 string "executables that should not be stripped"
405 depends on !BR2_STRIP_none
408 You may specify a space-separated list of binaries and libraries
409 here that should not be stripped on the target.
411 config BR2_STRIP_EXCLUDE_DIRS
412 string "directories that should be skipped when stripping"
413 depends on !BR2_STRIP_none
416 You may specify a space-separated list of directories that should
417 be skipped when stripping. Binaries and libraries in these
418 directories will not be touched.
419 The directories should be specified relative to the target directory,
420 without leading slash.
423 prompt "gcc optimization level"
424 default BR2_OPTIMIZE_S
426 Set the optimization level for gcc
428 config BR2_OPTIMIZE_0
429 bool "optimization level 0"
431 Do not optimize. This is the default.
433 config BR2_OPTIMIZE_1
434 bool "optimization level 1"
436 Optimize. Optimizing compilation takes somewhat more time,
437 and a lot more memory for a large function. With -O, the
438 compiler tries to reduce code size and execution time,
439 without performing any optimizations that take a great deal
440 of compilation time. -O turns on the following optimization
441 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
442 -fcprop-registers -floop-optimize -fif-conversion
443 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
444 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
445 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
446 -O also turns on -fomit-frame-pointer on machines where doing
447 so does not interfere with debugging.
449 config BR2_OPTIMIZE_2
450 bool "optimization level 2"
452 Optimize even more. GCC performs nearly all supported optimizations
453 that do not involve a space-speed tradeoff. The compiler does not
454 perform loop unrolling or function inlining when you specify -O2.
455 As compared to -O, this option increases both compilation time and
456 the performance of the generated code. -O2 turns on all optimization
457 flags specified by -O. It also turns on the following optimization
458 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
459 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
460 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
461 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
462 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
463 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
464 -freorder-functions -falign-functions -falign-jumps -falign-loops
465 -falign-labels -ftree-vrp -ftree-pre
466 Please note the warning under -fgcse about invoking -O2 on programs
467 that use computed gotos.
469 config BR2_OPTIMIZE_3
470 bool "optimization level 3"
472 Optimize yet more. -O3 turns on all optimizations specified by -O2
473 and also turns on the -finline-functions, -funswitch-loops and
474 -fgcse-after-reload options.
476 config BR2_OPTIMIZE_S
477 bool "optimize for size"
479 Optimize for size. -Os enables all -O2 optimizations that do not
480 typically increase code size. It also performs further optimizations
481 designed to reduce code size. -Os disables the following optimization
482 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
483 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
484 -ftree-vect-loop-version
488 config BR2_GOOGLE_BREAKPAD_ENABLE
489 bool "Enable google-breakpad support"
490 select BR2_PACKAGE_GOOGLE_BREAKPAD
491 depends on BR2_INSTALL_LIBSTDCPP
492 depends on BR2_TOOLCHAIN_USES_GLIBC
493 depends on BR2_PACKAGE_GOOGLE_BREAKPAD_ARCH_SUPPORTS
495 This option will enable the use of google breakpad, a
496 library and tool suite that allows you to distribute an
497 application to users with compiler-provided debugging
498 information removed, record crashes in compact "minidump"
499 files, send them back to your server and produce C and C++
500 stack traces from these minidumps. Breakpad can also write
501 minidumps on request for programs that have not crashed.
503 if BR2_GOOGLE_BREAKPAD_ENABLE
505 config BR2_GOOGLE_BREAKPAD_INCLUDE_FILES
506 string "List of executables and libraries to extract symbols from"
509 You may specify a space-separated list of binaries and
510 libraries with full paths relative to $(TARGET_DIR) of which
511 debug symbols will be dumped for further use with google
514 A directory structure that can be used by minidump-stackwalk
517 $(STAGING_DIR)/usr/share/google-breakpad-symbols
521 config BR2_ENABLE_SSP
522 bool "build code with Stack Smashing Protection"
523 depends on BR2_TOOLCHAIN_HAS_SSP
525 Enable stack smashing protection support using GCCs
526 -fstack-protector-all option.
528 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
531 Note that this requires the toolchain to have SSP
532 support. This is always the case for glibc and eglibc
533 toolchain, but is optional in uClibc toolchains.
535 comment "enabling Stack Smashing Protection requires support in the toolchain"
536 depends on !BR2_TOOLCHAIN_HAS_SSP
540 default BR2_SHARED_LIBS if BR2_BINFMT_SUPPORTS_SHARED
541 default BR2_STATIC_LIBS if !BR2_BINFMT_SUPPORTS_SHARED
543 Select the type of libraries you want to use on the target.
545 The default is to build dynamic libraries and use those on
546 the target filesystem, except when the architecture and/or
547 the selected binary format does not support shared
550 config BR2_STATIC_LIBS
553 Build and use only static libraries. No shared libraries
554 will be instaled on the target. This potentially increases
555 your code size and should only be used if you know what you
556 are doing. Note that some packages may not be available when
557 this option is enabled, due to their need for dynamic
560 config BR2_SHARED_LIBS
562 depends on BR2_BINFMT_SUPPORTS_SHARED
564 Build and use only shared libraries. This is the recommended
565 solution as it saves space and build time.
567 config BR2_SHARED_STATIC_LIBS
568 bool "both static and shared"
569 depends on BR2_BINFMT_SUPPORTS_SHARED
571 Build both shared and static libraries, but link executables
572 dynamically. While building both shared and static libraries
573 take more time and more disk space, having static libraries
574 may be useful to link some of the applications statically.
579 config BR2_PACKAGE_OVERRIDE_FILE
580 string "location of a package override file"
581 default "$(CONFIG_DIR)/local.mk"
583 A package override file is a short makefile that contains
584 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
585 which allows to tell Buildroot to use an existing directory
586 as the source directory for a particular package. See the
587 Buildroot documentation for more details on this feature.
589 config BR2_GLOBAL_PATCH_DIR
590 string "global patch directories"
592 You may specify a space separated list of one or more directories
593 containing global package patches. For a specific version
594 <packageversion> of a specific package <packagename>, patches are
597 First, the default Buildroot patch set for the package is applied
598 from the package's directory in Buildroot.
600 Then for every directory - <global-patch-dir> - that exists in
601 BR2_GLOBAL_PATCH_DIR, if the directory
602 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
603 *.patch files in this directory will be applied.
605 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
606 then all *.patch files in the directory will be applied.
610 config BR2_COMPILER_PARANOID_UNSAFE_PATH
611 bool "paranoid check of library/header paths"
613 By default, when this option is disabled, when the Buildroot
614 cross-compiler will encounter an unsafe library or header
615 path (such as /usr/include, or /usr/lib), the compiler will
618 By enabling this option, this warning is turned into an
619 error, which will completely abort the build when such
620 unsafe paths are encountered.
622 Note that this mechanism is available for both the internal
623 toolchain (through gcc and binutils patches) and external
624 toolchain backends (through the external toolchain wrapper).
630 source "toolchain/Config.in"
632 source "system/Config.in"
634 source "linux/Config.in"
636 source "package/Config.in"
638 source "fs/Config.in"
640 source "boot/Config.in"
642 source "package/Config.in.host"
644 source "Config.in.legacy"
646 menu "User-provided options"
647 depends on BR2_EXTERNAL != "support/dummy-external"
649 source "$BR2_EXTERNAL/Config.in"