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.
170 NOTE: This works for all packages using the central package
171 infrastructure (generic, autotools, cmake, ...)
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_DEBIAN_MIRROR
224 string "Debian Software mirror"
225 default "http://ftp.debian.org"
227 Debian has multiple software mirrors scattered around the world.
228 The following allows you to select your preferred mirror.
230 Usually, just add your country code like XX here:
231 http://ftp.XX.debian.org
235 config BR2_LUAROCKS_MIRROR
236 string "LuaRocks mirror"
237 default "http://luarocks.org/repositories/rocks"
241 See http://luarocks.org
243 config BR2_CPAN_MIRROR
244 string "CPAN mirror (Perl packages)"
245 default "http://search.cpan.org/CPAN"
247 CPAN (Comprehensive Perl Archive Network) is a repository
248 of Perl packages. It has multiple software mirrors scattered
249 around the world. This option allows you to select a mirror.
251 The list of mirrors is available at:
252 http://search.cpan.org/mirror
257 int "Number of jobs to run simultaneously (0 for auto)"
260 Number of jobs to run simultaneously. If 0, determine
261 automatically according to number of CPUs on the host
265 bool "Enable compiler cache"
267 This option will enable the use of ccache, a compiler
268 cache. It will cache the result of previous builds to speed
269 up future builds. By default, the cache is stored in
270 $HOME/.buildroot-ccache.
272 Note that Buildroot does not try to invalidate the cache
273 contents when the compiler changes in an incompatible
274 way. Therefore, if you make a change to the compiler version
275 and/or configuration, you are responsible for purging the
276 ccache cache by removing the $HOME/.buildroot-ccache
281 config BR2_CCACHE_DIR
282 string "Compiler cache location"
283 default "$(HOME)/.buildroot-ccache"
285 Where ccache should store cached files.
287 config BR2_CCACHE_INITIAL_SETUP
288 string "Compiler cache initial setup"
290 Initial ccache settings to apply, such as --max-files or --max-size.
292 For example, if your project is known to require more space than the
293 default max cache size, then you might want to increase the cache size
294 to a suitable amount using the -M (--max-size) option.
296 The string you specify here is passed verbatim to ccache. Refer to
297 ccache documentation for more details.
299 These initial settings are applied after ccache has been compiled.
303 config BR2_DEPRECATED
304 bool "Show packages that are deprecated or obsolete"
306 This option hides outdated/obsolete versions of packages.
310 config BR2_DEPRECATED_SINCE_2013_11
314 config BR2_DEPRECATED_SINCE_2014_02
318 config BR2_DEPRECATED_SINCE_2014_05
324 config BR2_ENABLE_DEBUG
325 bool "build packages with debugging symbols"
327 Build packages with debugging symbols enabled. All libraries
328 and binaries in the 'staging' directory will have debugging
329 symbols, which allows remote debugging even if libraries and
330 binaries are stripped on the target. Whether libraries and
331 binaries are stripped on the target is controlled by the
332 BR2_STRIP_* options below.
336 prompt "gcc debug level"
339 Set the debug level for gcc
344 Debug level 1 produces minimal information, enough
345 for making backtraces in parts of the program that
346 you don't plan to debug. This includes descriptions
347 of functions and external variables, but no information
348 about local variables and no line numbers.
353 The default gcc debug level is 2
358 Level 3 includes extra information, such as all the
359 macro definitions present in the program. Some debuggers
360 support macro expansion when you use -g3.
365 prompt "strip command for binaries on target"
366 default BR2_STRIP_strip
368 config BR2_STRIP_strip
370 depends on !BR2_PACKAGE_HOST_ELF2FLT
372 Binaries and libraries in the target filesystem will be
373 stripped using the normal 'strip' command. This allows to
374 save space, mainly by removing debugging symbols. Debugging
375 symbols on the target are needed for native debugging, but
376 not when remote debugging is used.
378 config BR2_STRIP_sstrip
380 select BR2_PACKAGE_SSTRIP_HOST
381 depends on !BR2_PACKAGE_HOST_ELF2FLT
382 depends on BR2_DEPRECATED_SINCE_2014_05
384 Binaries and libraries in the target filesystem will be
385 stripped using the 'sstrip' command, which strips a little
386 bit more than the traditional 'strip' command. This allows to
387 save space, mainly by removing debugging symbols. Debugging
388 symbols on the target are needed for native debugging, but
389 not when remote debugging is used.
391 config BR2_STRIP_none
394 Do not strip binaries and libraries in the target
398 config BR2_STRIP_EXCLUDE_FILES
399 string "executables that should not be stripped"
400 depends on !BR2_STRIP_none
403 You may specify a space-separated list of binaries and libraries
404 here that should not be stripped on the target.
406 config BR2_STRIP_EXCLUDE_DIRS
407 string "directories that should be skipped when stripping"
408 depends on !BR2_STRIP_none
411 You may specify a space-separated list of directories that should
412 be skipped when stripping. Binaries and libraries in these
413 directories will not be touched.
414 The directories should be specified relative to the target directory,
415 without leading slash.
418 prompt "gcc optimization level"
419 default BR2_OPTIMIZE_S
421 Set the optimization level for gcc
423 config BR2_OPTIMIZE_0
424 bool "optimization level 0"
426 Do not optimize. This is the default.
428 config BR2_OPTIMIZE_1
429 bool "optimization level 1"
431 Optimize. Optimizing compilation takes somewhat more time,
432 and a lot more memory for a large function. With -O, the
433 compiler tries to reduce code size and execution time,
434 without performing any optimizations that take a great deal
435 of compilation time. -O turns on the following optimization
436 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
437 -fcprop-registers -floop-optimize -fif-conversion
438 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
439 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
440 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
441 -O also turns on -fomit-frame-pointer on machines where doing
442 so does not interfere with debugging.
444 config BR2_OPTIMIZE_2
445 bool "optimization level 2"
447 Optimize even more. GCC performs nearly all supported optimizations
448 that do not involve a space-speed tradeoff. The compiler does not
449 perform loop unrolling or function inlining when you specify -O2.
450 As compared to -O, this option increases both compilation time and
451 the performance of the generated code. -O2 turns on all optimization
452 flags specified by -O. It also turns on the following optimization
453 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
454 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
455 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
456 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
457 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
458 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
459 -freorder-functions -falign-functions -falign-jumps -falign-loops
460 -falign-labels -ftree-vrp -ftree-pre
461 Please note the warning under -fgcse about invoking -O2 on programs
462 that use computed gotos.
464 config BR2_OPTIMIZE_3
465 bool "optimization level 3"
467 Optimize yet more. -O3 turns on all optimizations specified by -O2
468 and also turns on the -finline-functions, -funswitch-loops and
469 -fgcse-after-reload options.
471 config BR2_OPTIMIZE_S
472 bool "optimize for size"
474 Optimize for size. -Os enables all -O2 optimizations that do not
475 typically increase code size. It also performs further optimizations
476 designed to reduce code size. -Os disables the following optimization
477 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
478 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
479 -ftree-vect-loop-version
483 config BR2_ENABLE_SSP
484 bool "build code with Stack Smashing Protection"
485 depends on BR2_TOOLCHAIN_HAS_SSP
487 Enable stack smashing protection support using GCCs
488 -fstack-protector-all option.
490 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
493 Note that this requires the toolchain to have SSP
494 support. This is always the case for glibc and eglibc
495 toolchain, but is optional in uClibc toolchains.
497 comment "enabling Stack Smashing Protection requires support in the toolchain"
498 depends on !BR2_TOOLCHAIN_HAS_SSP
500 config BR2_PREFER_STATIC_LIB
501 bool "prefer static libraries"
503 Where possible, build and use static libraries for the target.
504 This potentially increases your code size and should only be
505 used if you know what you do.
506 The default is to build dynamic libraries and use those on
507 the target filesystem.
509 WARNING: This is highly experimental at the moment.
511 config BR2_PACKAGE_OVERRIDE_FILE
512 string "location of a package override file"
513 default "$(CONFIG_DIR)/local.mk"
515 A package override file is a short makefile that contains
516 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
517 which allows to tell Buildroot to use an existing directory
518 as the source directory for a particular package. See the
519 Buildroot documentation for more details on this feature.
521 config BR2_GLOBAL_PATCH_DIR
522 string "global patch directories"
524 You may specify a space separated list of one or more directories
525 containing global package patches. For a specific version
526 <packageversion> of a specific package <packagename>, patches are
529 First, the default Buildroot patch set for the package is applied
530 from the package's directory in Buildroot.
532 Then for every directory - <global-patch-dir> - that exists in
533 BR2_GLOBAL_PATCH_DIR, if the directory
534 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
535 *.patch files in this directory will be applied.
537 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
538 then all *.patch files in the directory will be applied.
542 source "toolchain/Config.in"
544 source "system/Config.in"
546 source "linux/Config.in"
548 source "package/Config.in"
550 source "fs/Config.in"
552 source "boot/Config.in"
554 source "package/Config.in.host"
556 source "Config.in.legacy"
558 menu "User-provided options"
559 depends on BR2_EXTERNAL != "support/dummy-external"
561 source "$BR2_EXTERNAL/Config.in"