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.
171 config BR2_PRIMARY_SITE_ONLY
172 bool "Only allow downloads from primary download site"
173 depends on BR2_PRIMARY_SITE != ""
175 If this option is enabled, downloads will only be attempted
176 from the primary download site. Other locations, like the
177 package's official download location or the backup download
178 site, will not be considered. Therefore, if the package is
179 not present on the primary site, the download fails.
181 This is useful for project developers who want to ensure
182 that the project can be built even if the upstream tarball
185 if !BR2_PRIMARY_SITE_ONLY
187 config BR2_BACKUP_SITE
188 string "Backup download site"
189 default "http://sources.buildroot.net"
191 Backup site to download from. If this option is set then buildroot
192 will fall back to download package sources from here if the
193 normal location fails.
195 config BR2_KERNEL_MIRROR
196 string "Kernel.org mirror"
197 default "https://www.kernel.org/pub"
199 kernel.org is mirrored on a number of servers around the world.
200 The following allows you to select your preferred mirror.
202 Have a look on the kernel.org site for a list of mirrors, then enter
203 the URL to the base directory. Examples:
205 http://www.XX.kernel.org/pub (XX = country code)
206 http://mirror.aarnet.edu.au/pub/ftp.kernel.org
208 config BR2_GNU_MIRROR
209 string "GNU Software mirror"
210 default "http://ftp.gnu.org/pub/gnu"
212 GNU has multiple software mirrors scattered around the world.
213 The following allows you to select your preferred mirror.
215 Have a look on the gnu.org site for a list of mirrors, then enter
216 the URL to the base directory. Examples:
218 http://ftp.gnu.org/pub/gnu
219 http://mirror.aarnet.edu.au/pub/gnu
221 config BR2_LUAROCKS_MIRROR
222 string "LuaRocks mirror"
223 default "http://rocks.moonscript.org"
227 See http://luarocks.org
229 config BR2_CPAN_MIRROR
230 string "CPAN mirror (Perl packages)"
231 default "http://cpan.metacpan.org"
233 CPAN (Comprehensive Perl Archive Network) is a repository
234 of Perl packages. It has multiple software mirrors scattered
235 around the world. This option allows you to select a mirror.
237 The list of mirrors is available at:
238 http://search.cpan.org/mirror
245 int "Number of jobs to run simultaneously (0 for auto)"
248 Number of jobs to run simultaneously. If 0, determine
249 automatically according to number of CPUs on the host
253 bool "Enable compiler cache"
255 This option will enable the use of ccache, a compiler
256 cache. It will cache the result of previous builds to speed
257 up future builds. By default, the cache is stored in
258 $HOME/.buildroot-ccache.
260 Note that Buildroot does not try to invalidate the cache
261 contents when the compiler changes in an incompatible
262 way. Therefore, if you make a change to the compiler version
263 and/or configuration, you are responsible for purging the
264 ccache cache by removing the $HOME/.buildroot-ccache
269 config BR2_CCACHE_DIR
270 string "Compiler cache location"
271 default "$(HOME)/.buildroot-ccache"
273 Where ccache should store cached files.
275 config BR2_CCACHE_INITIAL_SETUP
276 string "Compiler cache initial setup"
278 Initial ccache settings to apply, such as --max-files or --max-size.
280 For example, if your project is known to require more space than the
281 default max cache size, then you might want to increase the cache size
282 to a suitable amount using the -M (--max-size) option.
284 The string you specify here is passed verbatim to ccache. Refer to
285 ccache documentation for more details.
287 These initial settings are applied after ccache has been compiled.
291 config BR2_DEPRECATED
292 bool "Show options and packages that are deprecated or obsolete"
294 This option shows outdated/obsolete versions of packages and
295 options that are otherwise hidden.
299 config BR2_DEPRECATED_SINCE_2015_02
303 config BR2_DEPRECATED_SINCE_2015_05
307 config BR2_DEPRECATED_SINCE_2015_08
313 config BR2_ENABLE_DEBUG
314 bool "build packages with debugging symbols"
316 Build packages with debugging symbols enabled. All libraries
317 and binaries in the 'staging' directory will have debugging
318 symbols, which allows remote debugging even if libraries and
319 binaries are stripped on the target. Whether libraries and
320 binaries are stripped on the target is controlled by the
321 BR2_STRIP_* options below.
325 prompt "gcc debug level"
328 Set the debug level for gcc
333 Debug level 1 produces minimal information, enough
334 for making backtraces in parts of the program that
335 you don't plan to debug. This includes descriptions
336 of functions and external variables, but no information
337 about local variables and no line numbers.
342 The default gcc debug level is 2
347 Level 3 includes extra information, such as all the
348 macro definitions present in the program. Some debuggers
349 support macro expansion when you use -g3.
354 prompt "strip command for binaries on target"
355 default BR2_STRIP_strip
357 config BR2_STRIP_strip
359 depends on !BR2_PACKAGE_HOST_ELF2FLT
361 Binaries and libraries in the target filesystem will be
362 stripped using the normal 'strip' command. This allows to
363 save space, mainly by removing debugging symbols. Debugging
364 symbols on the target are needed for native debugging, but
365 not when remote debugging is used.
367 config BR2_STRIP_none
370 Do not strip binaries and libraries in the target
374 config BR2_STRIP_EXCLUDE_FILES
375 string "executables that should not be stripped"
376 depends on !BR2_STRIP_none
379 You may specify a space-separated list of binaries and libraries
380 here that should not be stripped on the target.
382 config BR2_STRIP_EXCLUDE_DIRS
383 string "directories that should be skipped when stripping"
384 depends on !BR2_STRIP_none
387 You may specify a space-separated list of directories that should
388 be skipped when stripping. Binaries and libraries in these
389 directories will not be touched.
390 The directories should be specified relative to the target directory,
391 without leading slash.
394 prompt "gcc optimization level"
395 default BR2_OPTIMIZE_S
397 Set the optimization level for gcc
399 config BR2_OPTIMIZE_0
400 bool "optimization level 0"
402 Do not optimize. This is the default.
404 config BR2_OPTIMIZE_1
405 bool "optimization level 1"
407 Optimize. Optimizing compilation takes somewhat more time,
408 and a lot more memory for a large function. With -O, the
409 compiler tries to reduce code size and execution time,
410 without performing any optimizations that take a great deal
411 of compilation time. -O turns on the following optimization
412 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
413 -fcprop-registers -floop-optimize -fif-conversion
414 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
415 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
416 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
417 -O also turns on -fomit-frame-pointer on machines where doing
418 so does not interfere with debugging.
420 config BR2_OPTIMIZE_2
421 bool "optimization level 2"
423 Optimize even more. GCC performs nearly all supported optimizations
424 that do not involve a space-speed tradeoff. The compiler does not
425 perform loop unrolling or function inlining when you specify -O2.
426 As compared to -O, this option increases both compilation time and
427 the performance of the generated code. -O2 turns on all optimization
428 flags specified by -O. It also turns on the following optimization
429 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
430 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
431 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
432 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
433 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
434 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
435 -freorder-functions -falign-functions -falign-jumps -falign-loops
436 -falign-labels -ftree-vrp -ftree-pre
437 Please note the warning under -fgcse about invoking -O2 on programs
438 that use computed gotos.
440 config BR2_OPTIMIZE_3
441 bool "optimization level 3"
443 Optimize yet more. -O3 turns on all optimizations specified by -O2
444 and also turns on the -finline-functions, -funswitch-loops and
445 -fgcse-after-reload options.
447 config BR2_OPTIMIZE_S
448 bool "optimize for size"
450 Optimize for size. -Os enables all -O2 optimizations that do not
451 typically increase code size. It also performs further optimizations
452 designed to reduce code size. -Os disables the following optimization
453 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
454 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
455 -ftree-vect-loop-version
459 config BR2_GOOGLE_BREAKPAD_ENABLE
460 bool "Enable google-breakpad support"
461 select BR2_PACKAGE_GOOGLE_BREAKPAD
462 depends on BR2_INSTALL_LIBSTDCPP
463 depends on BR2_TOOLCHAIN_USES_GLIBC
464 depends on BR2_PACKAGE_GOOGLE_BREAKPAD_ARCH_SUPPORTS
466 This option will enable the use of google breakpad, a
467 library and tool suite that allows you to distribute an
468 application to users with compiler-provided debugging
469 information removed, record crashes in compact "minidump"
470 files, send them back to your server and produce C and C++
471 stack traces from these minidumps. Breakpad can also write
472 minidumps on request for programs that have not crashed.
474 if BR2_GOOGLE_BREAKPAD_ENABLE
476 config BR2_GOOGLE_BREAKPAD_INCLUDE_FILES
477 string "List of executables and libraries to extract symbols from"
480 You may specify a space-separated list of binaries and
481 libraries with full paths relative to $(TARGET_DIR) of which
482 debug symbols will be dumped for further use with google
485 A directory structure that can be used by minidump-stackwalk
488 $(STAGING_DIR)/usr/share/google-breakpad-symbols
492 config BR2_ENABLE_SSP
493 bool "build code with Stack Smashing Protection"
494 depends on BR2_TOOLCHAIN_HAS_SSP
496 Enable stack smashing protection support using GCCs
497 -fstack-protector-all option.
499 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
502 Note that this requires the toolchain to have SSP
503 support. This is always the case for glibc and eglibc
504 toolchain, but is optional in uClibc toolchains.
506 comment "enabling Stack Smashing Protection requires support in the toolchain"
507 depends on !BR2_TOOLCHAIN_HAS_SSP
511 default BR2_SHARED_LIBS if BR2_BINFMT_SUPPORTS_SHARED
512 default BR2_STATIC_LIBS if !BR2_BINFMT_SUPPORTS_SHARED
514 Select the type of libraries you want to use on the target.
516 The default is to build dynamic libraries and use those on
517 the target filesystem, except when the architecture and/or
518 the selected binary format does not support shared
521 config BR2_STATIC_LIBS
524 Build and use only static libraries. No shared libraries
525 will be instaled on the target. This potentially increases
526 your code size and should only be used if you know what you
527 are doing. Note that some packages may not be available when
528 this option is enabled, due to their need for dynamic
531 config BR2_SHARED_LIBS
533 depends on BR2_BINFMT_SUPPORTS_SHARED
535 Build and use only shared libraries. This is the recommended
536 solution as it saves space and build time.
538 config BR2_SHARED_STATIC_LIBS
539 bool "both static and shared"
540 depends on BR2_BINFMT_SUPPORTS_SHARED
542 Build both shared and static libraries, but link executables
543 dynamically. While building both shared and static libraries
544 take more time and more disk space, having static libraries
545 may be useful to link some of the applications statically.
550 config BR2_PACKAGE_OVERRIDE_FILE
551 string "location of a package override file"
552 default "$(CONFIG_DIR)/local.mk"
554 A package override file is a short makefile that contains
555 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
556 which allows to tell Buildroot to use an existing directory
557 as the source directory for a particular package. See the
558 Buildroot documentation for more details on this feature.
560 config BR2_GLOBAL_PATCH_DIR
561 string "global patch directories"
563 You may specify a space separated list of one or more directories
564 containing global package patches. For a specific version
565 <packageversion> of a specific package <packagename>, patches are
568 First, the default Buildroot patch set for the package is applied
569 from the package's directory in Buildroot.
571 Then for every directory - <global-patch-dir> - that exists in
572 BR2_GLOBAL_PATCH_DIR, if the directory
573 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
574 *.patch files in this directory will be applied.
576 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
577 then all *.patch files in the directory will be applied.
581 config BR2_COMPILER_PARANOID_UNSAFE_PATH
582 bool "paranoid check of library/header paths"
584 By default, when this option is disabled, when the Buildroot
585 cross-compiler will encounter an unsafe library or header
586 path (such as /usr/include, or /usr/lib), the compiler will
589 By enabling this option, this warning is turned into an
590 error, which will completely abort the build when such
591 unsafe paths are encountered.
593 Note that this mechanism is available for both the internal
594 toolchain (through gcc and binutils patches) and external
595 toolchain backends (through the external toolchain wrapper).
601 source "toolchain/Config.in"
603 source "system/Config.in"
605 source "linux/Config.in"
607 source "package/Config.in"
609 source "fs/Config.in"
611 source "boot/Config.in"
613 source "package/Config.in.host"
615 source "Config.in.legacy"
617 menu "User-provided options"
618 depends on BR2_EXTERNAL != "support/dummy-external"
620 source "$BR2_EXTERNAL/Config.in"