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 BR2_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_05
271 config BR2_DEPRECATED_SINCE_2013_08
275 config BR2_DEPRECATED_SINCE_2013_11
279 config BR2_DEPRECATED_SINCE_2014_02
285 config BR2_ENABLE_DEBUG
286 bool "build packages with debugging symbols"
288 Build packages with debugging symbols enabled. All libraries
289 and binaries in the 'staging' directory will have debugging
290 symbols, which allows remote debugging even if libraries and
291 binaries are stripped on the target. Whether libraries and
292 binaries are stripped on the target is controlled by the
293 BR2_STRIP_* options below.
297 prompt "gcc debug level"
300 Set the debug level for gcc
305 Debug level 1 produces minimal information, enough
306 for making backtraces in parts of the program that
307 you don't plan to debug. This includes descriptions
308 of functions and external variables, but no information
309 about local variables and no line numbers.
314 The default gcc debug level is 2
319 Level 3 includes extra information, such as all the
320 macro definitions present in the program. Some debuggers
321 support macro expansion when you use -g3.
326 prompt "strip command for binaries on target"
327 default BR2_STRIP_strip
329 config BR2_STRIP_strip
331 depends on !BR2_PACKAGE_HOST_ELF2FLT
333 Binaries and libraries in the target filesystem will be
334 stripped using the normal 'strip' command. This allows to
335 save space, mainly by removing debugging symbols. Debugging
336 symbols on the target are needed for native debugging, but
337 not when remote debugging is used.
339 config BR2_STRIP_sstrip
341 select BR2_PACKAGE_SSTRIP_HOST
342 depends on !BR2_PACKAGE_HOST_ELF2FLT
344 Binaries and libraries in the target filesystem will be
345 stripped using the 'sstrip' command, which strips a little
346 bit more than the traditional 'strip' command. This allows to
347 save space, mainly by removing debugging symbols. Debugging
348 symbols on the target are needed for native debugging, but
349 not when remote debugging is used.
351 config BR2_STRIP_none
354 Do not strip binaries and libraries in the target
358 config BR2_STRIP_EXCLUDE_FILES
359 string "executables that should not be stripped"
360 depends on !BR2_STRIP_none
363 You may specify a space-separated list of binaries and libraries
364 here that should not be stripped on the target.
366 config BR2_STRIP_EXCLUDE_DIRS
367 string "directories that should be skipped when stripping"
368 depends on !BR2_STRIP_none
371 You may specify a space-separated list of directories that should
372 be skipped when stripping. Binaries and libraries in these
373 directories will not be touched.
374 The directories should be specified relative to the target directory,
375 without leading slash.
378 prompt "gcc optimization level"
379 default BR2_OPTIMIZE_S
381 Set the optimization level for gcc
383 config BR2_OPTIMIZE_0
384 bool "optimization level 0"
386 Do not optimize. This is the default.
388 config BR2_OPTIMIZE_1
389 bool "optimization level 1"
391 Optimize. Optimizing compilation takes somewhat more time,
392 and a lot more memory for a large function. With -O, the
393 compiler tries to reduce code size and execution time,
394 without performing any optimizations that take a great deal
395 of compilation time. -O turns on the following optimization
396 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
397 -fcprop-registers -floop-optimize -fif-conversion
398 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
399 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
400 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
401 -O also turns on -fomit-frame-pointer on machines where doing
402 so does not interfere with debugging.
404 config BR2_OPTIMIZE_2
405 bool "optimization level 2"
407 Optimize even more. GCC performs nearly all supported optimizations
408 that do not involve a space-speed tradeoff. The compiler does not
409 perform loop unrolling or function inlining when you specify -O2.
410 As compared to -O, this option increases both compilation time and
411 the performance of the generated code. -O2 turns on all optimization
412 flags specified by -O. It also turns on the following optimization
413 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
414 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
415 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
416 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
417 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
418 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
419 -freorder-functions -falign-functions -falign-jumps -falign-loops
420 -falign-labels -ftree-vrp -ftree-pre
421 Please note the warning under -fgcse about invoking -O2 on programs
422 that use computed gotos.
424 config BR2_OPTIMIZE_3
425 bool "optimization level 3"
427 Optimize yet more. -O3 turns on all optimizations specified by -O2
428 and also turns on the -finline-functions, -funswitch-loops and
429 -fgcse-after-reload options.
431 config BR2_OPTIMIZE_S
432 bool "optimize for size"
434 Optimize for size. -Os enables all -O2 optimizations that do not
435 typically increase code size. It also performs further optimizations
436 designed to reduce code size. -Os disables the following optimization
437 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
438 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
439 -ftree-vect-loop-version
443 config BR2_ENABLE_SSP
444 bool "build code with Stack Smashing Protection"
445 depends on BR2_TOOLCHAIN_HAS_SSP
447 Enable stack smashing protection support using GCCs
448 -fstack-protector-all option.
450 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
453 Note that this requires the toolchain to have SSP
454 support. This is always the case for glibc and eglibc
455 toolchain, but is optional in uClibc toolchains.
457 comment "enabling Stack Smashing Protection requires support in the toolchain"
458 depends on !BR2_TOOLCHAIN_HAS_SSP
460 config BR2_PREFER_STATIC_LIB
461 bool "prefer static libraries"
463 Where possible, build and use static libraries for the target.
464 This potentially increases your code size and should only be
465 used if you know what you do.
466 The default is to build dynamic libraries and use those on
467 the target filesystem.
469 WARNING: This is highly experimental at the moment.
471 config BR2_PACKAGE_OVERRIDE_FILE
472 string "location of a package override file"
473 default "$(TOPDIR)/local.mk"
475 A package override file is a short makefile that contains
476 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
477 which allows to tell Buildroot to use an existing directory
478 as the source directory for a particular package. See the
479 Buildroot documentation for more details on this feature.
481 config BR2_GLOBAL_PATCH_DIR
482 string "global patch directories"
484 You may specify a space separated list of one or more directories
485 containing global package patches. For a specific version
486 <packageversion> of a specific package <packagename>, patches are
489 First, the default Buildroot patch set for the package is applied
490 from the package's directory in Buildroot.
492 Then for every directory - <global-patch-dir> - that exists in
493 BR2_GLOBAL_PATCH_DIR, if the directory
494 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
495 *.patch files in this directory will be applied.
497 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
498 then all *.patch files in the directory will be applied.
502 source "toolchain/Config.in"
504 source "system/Config.in"
506 source "linux/Config.in"
508 source "package/Config.in"
510 source "fs/Config.in"
512 source "boot/Config.in"
514 source "package/Config.in.host"
516 source "Config.in.legacy"
518 menu "User-provided options"
519 depends on BR2_EXTERNAL != "support/dummy-external"
521 source "$BR2_EXTERNAL/Config.in"