3 mainmenu "Buildroot $BR2_VERSION Configuration"
5 config BR2_HAVE_DOT_CONFIG
11 option env="BR2_VERSION_FULL"
19 option env="BR2_EXTERNAL"
21 # Hidden boolean selected by pre-built packages for x86, when they
22 # need to run on x86-64 machines (example: pre-built external
23 # toolchains, binary tools like SAM-BA, etc.).
24 config BR2_HOSTARCH_NEEDS_IA32_LIBS
27 # Hidden boolean selected by packages that need to build 32 bits
28 # binaries with the host compiler, even on 64 bits build machines (e.g
30 config BR2_HOSTARCH_NEEDS_IA32_COMPILER
33 source "arch/Config.in"
41 default "wget --passive-ftp -nd -t 3"
44 string "Subversion (svn) command"
48 string "Bazaar (bzr) command"
60 string "Local files retrieval command"
64 string "Secure copy (scp) command"
68 string "Secure shell (ssh) command"
72 string "Mercurial (hg) command"
79 Command to be used to extract a gzip'ed file to stdout.
80 zcat is identical to gunzip -c except that the former may
81 not be available on your system.
82 Default is "gzip -d -c"
83 Other possible values include "gunzip -c" or "zcat".
86 string "bzcat command"
89 Command to be used to extract a bzip2'ed file to stdout.
90 bzcat is identical to bunzip2 -c except that the former may
91 not be available on your system.
93 Other possible values include "bunzip2 -c" or "bzip2 -d -c".
96 string "xzcat command"
99 Command to be used to extract a xz'ed file to stdout.
102 config BR2_TAR_OPTIONS
106 Options to pass to tar when extracting the sources.
107 E.g. " -v --exclude='*.svn*'" to exclude all .svn internal files
112 config BR2_DEFCONFIG_FROM_ENV
114 option env="BR2_DEFCONFIG"
117 string "Location to save buildroot config"
118 default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
119 default "$(CONFIG_DIR)/defconfig"
121 When running 'make savedefconfig', the defconfig file will be saved
125 string "Download dir"
126 default "$(TOPDIR)/dl"
128 Directory to store all the source files that we need to fetch.
129 If the Linux shell environment has defined the BUILDROOT_DL_DIR
130 environment variable, then this overrides this configuration item.
132 The default is $(TOPDIR)/dl
136 default "$(BASE_DIR)/host"
138 Directory to store all the binary files that are built for the host.
139 This includes the cross compilation toolchain when building the
140 internal buildroot toolchain.
142 The default is $(BASE_DIR)/host
144 menu "Mirrors and Download locations"
146 config BR2_PRIMARY_SITE
147 string "Primary download site"
150 Primary site to download from. If this option is set then buildroot
151 will try to download package source first from this site and try the
152 default if the file is not found.
153 Valid URIs are URIs recognized by $(WGET) and scp URIs of the form
154 scp://[user@]host:path.
155 NOTE: This works for all packages using the central package
156 infrastructure (generic, autotools, cmake, ...)
158 config BR2_PRIMARY_SITE_ONLY
159 bool "Only allow downloads from primary download site"
160 depends on BR2_PRIMARY_SITE != ""
162 If this option is enabled, downloads will only be attempted
163 from the primary download site. Other locations, like the
164 package's official download location or the backup download
165 site, will not be considered. Therefore, if the package is
166 not present on the primary site, the download fails.
168 This is useful for project developers who want to ensure
169 that the project can be built even if the upstream tarball
172 if !BR2_PRIMARY_SITE_ONLY
174 config BR2_BACKUP_SITE
175 string "Backup download site"
176 default "http://sources.buildroot.net/"
178 Backup site to download from. If this option is set then buildroot
179 will fall back to download package sources from here if the
180 normal location fails.
182 config BR2_KERNEL_MIRROR
183 string "Kernel.org mirror"
184 default "http://www.kernel.org/pub/"
186 kernel.org is mirrored on a number of servers around the world.
187 The following allows you to select your preferred mirror.
189 Have a look on the kernel.org site for a list of mirrors, then enter
190 the URL to the base directory. Examples:
192 http://www.XX.kernel.org/pub (XX = country code)
193 http://mirror.aarnet.edu.au/pub/ftp.kernel.org
195 config BR2_GNU_MIRROR
196 string "GNU Software mirror"
197 default "http://ftp.gnu.org/pub/gnu"
199 GNU has multiple software mirrors scattered around the world.
200 The following allows you to select your preferred mirror.
202 Have a look on the gnu.org site for a list of mirrors, then enter
203 the URL to the base directory. Examples:
205 http://ftp.gnu.org/pub/gnu
206 http://mirror.aarnet.edu.au/pub/gnu
208 config BR2_DEBIAN_MIRROR
209 string "Debian Software mirror"
210 default "http://ftp.debian.org"
212 Debian has multiple software mirrors scattered around the world.
213 The following allows you to select your preferred mirror.
215 Usually, just add your country code like XX here:
216 http://ftp.XX.debian.org
220 config BR2_LUAROCKS_MIRROR
221 string "LuaRocks mirror"
222 default "http://luarocks.org/repositories/rocks"
226 See http://luarocks.org
231 int "Number of jobs to run simultaneously (0 for auto)"
234 Number of jobs to run simultaneously. If 0, determine
235 automatically according to number of CPUs on the host
239 bool "Enable compiler cache"
241 This option will enable the use of ccache, a compiler
242 cache. It will cache the result of previous builds to speed
243 up future builds. The cache is stored in
244 $HOME/.buildroot-ccache.
246 Note that Buildroot does not try to invalidate the cache
247 contents when the compiler changes in an incompatible
248 way. Therefore, if you make a change to the compiler version
249 and/or configuration, you are responsible for purging the
250 ccache cache by removing the $HOME/.buildroot-ccache
253 config BR2_CCACHE_DIR
254 string "Compiler cache location"
255 depends on BR2_CCACHE
256 default "$(HOME)/.buildroot-ccache"
258 Where ccache should store cached files.
260 config BR2_DEPRECATED
261 bool "Show packages that are deprecated or obsolete"
263 This option hides outdated/obsolete versions of packages.
267 config BR2_DEPRECATED_SINCE_2012_11
271 config BR2_DEPRECATED_SINCE_2013_02
275 config BR2_DEPRECATED_SINCE_2013_05
279 config BR2_DEPRECATED_SINCE_2013_08
283 config BR2_DEPRECATED_SINCE_2013_11
287 config BR2_DEPRECATED_SINCE_2014_02
293 config BR2_ENABLE_DEBUG
294 bool "build packages with debugging symbols"
296 Build packages with debugging symbols enabled. All libraries
297 and binaries in the 'staging' directory will have debugging
298 symbols, which allows remote debugging even if libraries and
299 binaries are stripped on the target. Whether libraries and
300 binaries are stripped on the target is controlled by the
301 BR2_STRIP_* options below.
305 prompt "gcc debug level"
308 Set the debug level for gcc
313 Debug level 1 produces minimal information, enough
314 for making backtraces in parts of the program that
315 you don't plan to debug. This includes descriptions
316 of functions and external variables, but no information
317 about local variables and no line numbers.
322 The default gcc debug level is 2
327 Level 3 includes extra information, such as all the
328 macro definitions present in the program. Some debuggers
329 support macro expansion when you use -g3.
334 prompt "strip command for binaries on target"
335 default BR2_STRIP_strip
337 config BR2_STRIP_strip
339 depends on !BR2_PACKAGE_HOST_ELF2FLT
341 Binaries and libraries in the target filesystem will be
342 stripped using the normal 'strip' command. This allows to
343 save space, mainly by removing debugging symbols. Debugging
344 symbols on the target are needed for native debugging, but
345 not when remote debugging is used.
347 config BR2_STRIP_sstrip
349 select BR2_PACKAGE_SSTRIP_HOST
350 depends on !BR2_PACKAGE_HOST_ELF2FLT
352 Binaries and libraries in the target filesystem will be
353 stripped using the 'sstrip' command, which strips a little
354 bit more than the traditional 'strip' command. This allows to
355 save space, mainly by removing debugging symbols. Debugging
356 symbols on the target are needed for native debugging, but
357 not when remote debugging is used.
359 config BR2_STRIP_none
362 Do not strip binaries and libraries in the target
366 config BR2_STRIP_EXCLUDE_FILES
367 string "executables that should not be stripped"
368 depends on !BR2_STRIP_none
371 You may specify a space-separated list of binaries and libraries
372 here that should not be stripped on the target.
374 config BR2_STRIP_EXCLUDE_DIRS
375 string "directories that should be skipped when stripping"
376 depends on !BR2_STRIP_none
379 You may specify a space-separated list of directories that should
380 be skipped when stripping. Binaries and libraries in these
381 directories will not be touched.
382 The directories should be specified relative to the target directory,
383 without leading slash.
386 prompt "gcc optimization level"
387 default BR2_OPTIMIZE_S
389 Set the optimization level for gcc
391 config BR2_OPTIMIZE_0
392 bool "optimization level 0"
394 Do not optimize. This is the default.
396 config BR2_OPTIMIZE_1
397 bool "optimization level 1"
399 Optimize. Optimizing compilation takes somewhat more time,
400 and a lot more memory for a large function. With -O, the
401 compiler tries to reduce code size and execution time,
402 without performing any optimizations that take a great deal
403 of compilation time. -O turns on the following optimization
404 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
405 -fcprop-registers -floop-optimize -fif-conversion
406 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
407 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
408 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
409 -O also turns on -fomit-frame-pointer on machines where doing
410 so does not interfere with debugging.
412 config BR2_OPTIMIZE_2
413 bool "optimization level 2"
415 Optimize even more. GCC performs nearly all supported optimizations
416 that do not involve a space-speed tradeoff. The compiler does not
417 perform loop unrolling or function inlining when you specify -O2.
418 As compared to -O, this option increases both compilation time and
419 the performance of the generated code. -O2 turns on all optimization
420 flags specified by -O. It also turns on the following optimization
421 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
422 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
423 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
424 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
425 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
426 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
427 -freorder-functions -falign-functions -falign-jumps -falign-loops
428 -falign-labels -ftree-vrp -ftree-pre
429 Please note the warning under -fgcse about invoking -O2 on programs
430 that use computed gotos.
432 config BR2_OPTIMIZE_3
433 bool "optimization level 3"
435 Optimize yet more. -O3 turns on all optimizations specified by -O2
436 and also turns on the -finline-functions, -funswitch-loops and
437 -fgcse-after-reload options.
439 config BR2_OPTIMIZE_S
440 bool "optimize for size"
442 Optimize for size. -Os enables all -O2 optimizations that do not
443 typically increase code size. It also performs further optimizations
444 designed to reduce code size. -Os disables the following optimization
445 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
446 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
447 -ftree-vect-loop-version
451 config BR2_ENABLE_SSP
452 bool "build code with Stack Smashing Protection"
453 depends on BR2_TOOLCHAIN_HAS_SSP
455 Enable stack smashing protection support using GCCs
456 -fstack-protector-all option.
458 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
461 Note that this requires the toolchain to have SSP
462 support. This is always the case for glibc and eglibc
463 toolchain, but is optional in uClibc toolchains.
465 comment "enabling Stack Smashing Protection requires support in the toolchain"
466 depends on !BR2_TOOLCHAIN_HAS_SSP
468 config BR2_PREFER_STATIC_LIB
469 bool "prefer static libraries"
471 Where possible, build and use static libraries for the target.
472 This potentially increases your code size and should only be
473 used if you know what you do.
474 The default is to build dynamic libraries and use those on
475 the target filesystem.
477 WARNING: This is highly experimental at the moment.
479 config BR2_HAVE_DOCUMENTATION
480 bool "documentation on the target"
481 # We no longer want to support a toolchain on the target
482 depends on BR2_DEPRECATED_SINCE_2012_11
484 Install the documentation, including manual pages and info
485 pages, on the target.
486 If you say n here, your target will not contain any
489 config BR2_PACKAGE_OVERRIDE_FILE
490 string "location of a package override file"
491 default "$(TOPDIR)/local.mk"
493 A package override file is a short makefile that contains
494 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
495 which allows to tell Buildroot to use an existing directory
496 as the source directory for a particular package. See the
497 Buildroot documentation for more details on this feature.
499 config BR2_GLOBAL_PATCH_DIR
500 string "global patch directories"
502 You may specify a space separated list of one or more directories
503 containing global package patches. For a specific version
504 <packageversion> of a specific package <packagename>, patches are
507 First, the default Buildroot patch set for the package is applied
508 from the package's directory in Buildroot.
510 Then for every directory - <global-patch-dir> - that exists in
511 BR2_GLOBAL_PATCH_DIR, if the directory
512 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
513 *.patch files in this directory will be applied.
515 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
516 then all *.patch files in the directory will be applied.
520 source "toolchain/Config.in"
522 source "system/Config.in"
524 source "linux/Config.in"
526 source "package/Config.in"
528 source "fs/Config.in"
530 source "boot/Config.in"
532 source "package/Config.in.host"
534 source "Config.in.legacy"
536 menu "User-provided options"
537 depends on BR2_EXTERNAL != "support/dummy-external"
539 source "$BR2_EXTERNAL/Config.in"