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_2013_02
271 config BR2_DEPRECATED_SINCE_2013_05
275 config BR2_DEPRECATED_SINCE_2013_08
279 config BR2_DEPRECATED_SINCE_2013_11
283 config BR2_DEPRECATED_SINCE_2014_02
289 config BR2_ENABLE_DEBUG
290 bool "build packages with debugging symbols"
292 Build packages with debugging symbols enabled. All libraries
293 and binaries in the 'staging' directory will have debugging
294 symbols, which allows remote debugging even if libraries and
295 binaries are stripped on the target. Whether libraries and
296 binaries are stripped on the target is controlled by the
297 BR2_STRIP_* options below.
301 prompt "gcc debug level"
304 Set the debug level for gcc
309 Debug level 1 produces minimal information, enough
310 for making backtraces in parts of the program that
311 you don't plan to debug. This includes descriptions
312 of functions and external variables, but no information
313 about local variables and no line numbers.
318 The default gcc debug level is 2
323 Level 3 includes extra information, such as all the
324 macro definitions present in the program. Some debuggers
325 support macro expansion when you use -g3.
330 prompt "strip command for binaries on target"
331 default BR2_STRIP_strip
333 config BR2_STRIP_strip
335 depends on !BR2_PACKAGE_HOST_ELF2FLT
337 Binaries and libraries in the target filesystem will be
338 stripped using the normal 'strip' command. This allows to
339 save space, mainly by removing debugging symbols. Debugging
340 symbols on the target are needed for native debugging, but
341 not when remote debugging is used.
343 config BR2_STRIP_sstrip
345 select BR2_PACKAGE_SSTRIP_HOST
346 depends on !BR2_PACKAGE_HOST_ELF2FLT
348 Binaries and libraries in the target filesystem will be
349 stripped using the 'sstrip' command, which strips a little
350 bit more than the traditional 'strip' command. This allows to
351 save space, mainly by removing debugging symbols. Debugging
352 symbols on the target are needed for native debugging, but
353 not when remote debugging is used.
355 config BR2_STRIP_none
358 Do not strip binaries and libraries in the target
362 config BR2_STRIP_EXCLUDE_FILES
363 string "executables that should not be stripped"
364 depends on !BR2_STRIP_none
367 You may specify a space-separated list of binaries and libraries
368 here that should not be stripped on the target.
370 config BR2_STRIP_EXCLUDE_DIRS
371 string "directories that should be skipped when stripping"
372 depends on !BR2_STRIP_none
375 You may specify a space-separated list of directories that should
376 be skipped when stripping. Binaries and libraries in these
377 directories will not be touched.
378 The directories should be specified relative to the target directory,
379 without leading slash.
382 prompt "gcc optimization level"
383 default BR2_OPTIMIZE_S
385 Set the optimization level for gcc
387 config BR2_OPTIMIZE_0
388 bool "optimization level 0"
390 Do not optimize. This is the default.
392 config BR2_OPTIMIZE_1
393 bool "optimization level 1"
395 Optimize. Optimizing compilation takes somewhat more time,
396 and a lot more memory for a large function. With -O, the
397 compiler tries to reduce code size and execution time,
398 without performing any optimizations that take a great deal
399 of compilation time. -O turns on the following optimization
400 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
401 -fcprop-registers -floop-optimize -fif-conversion
402 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
403 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
404 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
405 -O also turns on -fomit-frame-pointer on machines where doing
406 so does not interfere with debugging.
408 config BR2_OPTIMIZE_2
409 bool "optimization level 2"
411 Optimize even more. GCC performs nearly all supported optimizations
412 that do not involve a space-speed tradeoff. The compiler does not
413 perform loop unrolling or function inlining when you specify -O2.
414 As compared to -O, this option increases both compilation time and
415 the performance of the generated code. -O2 turns on all optimization
416 flags specified by -O. It also turns on the following optimization
417 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
418 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
419 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
420 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
421 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
422 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
423 -freorder-functions -falign-functions -falign-jumps -falign-loops
424 -falign-labels -ftree-vrp -ftree-pre
425 Please note the warning under -fgcse about invoking -O2 on programs
426 that use computed gotos.
428 config BR2_OPTIMIZE_3
429 bool "optimization level 3"
431 Optimize yet more. -O3 turns on all optimizations specified by -O2
432 and also turns on the -finline-functions, -funswitch-loops and
433 -fgcse-after-reload options.
435 config BR2_OPTIMIZE_S
436 bool "optimize for size"
438 Optimize for size. -Os enables all -O2 optimizations that do not
439 typically increase code size. It also performs further optimizations
440 designed to reduce code size. -Os disables the following optimization
441 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
442 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
443 -ftree-vect-loop-version
447 config BR2_ENABLE_SSP
448 bool "build code with Stack Smashing Protection"
449 depends on BR2_TOOLCHAIN_HAS_SSP
451 Enable stack smashing protection support using GCCs
452 -fstack-protector-all option.
454 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
457 Note that this requires the toolchain to have SSP
458 support. This is always the case for glibc and eglibc
459 toolchain, but is optional in uClibc toolchains.
461 comment "enabling Stack Smashing Protection requires support in the toolchain"
462 depends on !BR2_TOOLCHAIN_HAS_SSP
464 config BR2_PREFER_STATIC_LIB
465 bool "prefer static libraries"
467 Where possible, build and use static libraries for the target.
468 This potentially increases your code size and should only be
469 used if you know what you do.
470 The default is to build dynamic libraries and use those on
471 the target filesystem.
473 WARNING: This is highly experimental at the moment.
475 config BR2_PACKAGE_OVERRIDE_FILE
476 string "location of a package override file"
477 default "$(TOPDIR)/local.mk"
479 A package override file is a short makefile that contains
480 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
481 which allows to tell Buildroot to use an existing directory
482 as the source directory for a particular package. See the
483 Buildroot documentation for more details on this feature.
485 config BR2_GLOBAL_PATCH_DIR
486 string "global patch directories"
488 You may specify a space separated list of one or more directories
489 containing global package patches. For a specific version
490 <packageversion> of a specific package <packagename>, patches are
493 First, the default Buildroot patch set for the package is applied
494 from the package's directory in Buildroot.
496 Then for every directory - <global-patch-dir> - that exists in
497 BR2_GLOBAL_PATCH_DIR, if the directory
498 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
499 *.patch files in this directory will be applied.
501 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
502 then all *.patch files in the directory will be applied.
506 source "toolchain/Config.in"
508 source "system/Config.in"
510 source "linux/Config.in"
512 source "package/Config.in"
514 source "fs/Config.in"
516 source "boot/Config.in"
518 source "package/Config.in.host"
520 source "Config.in.legacy"
522 menu "User-provided options"
523 depends on BR2_EXTERNAL != "support/dummy-external"
525 source "$BR2_EXTERNAL/Config.in"