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. 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 $HOME/.buildroot-ccache
279 config BR2_CCACHE_DIR
280 string "Compiler cache location"
281 depends on BR2_CCACHE
282 default "$(HOME)/.buildroot-ccache"
284 Where ccache should store cached files.
286 config BR2_DEPRECATED
287 bool "Show packages that are deprecated or obsolete"
289 This option hides outdated/obsolete versions of packages.
293 config BR2_DEPRECATED_SINCE_2013_11
297 config BR2_DEPRECATED_SINCE_2014_02
301 config BR2_DEPRECATED_SINCE_2014_05
307 config BR2_ENABLE_DEBUG
308 bool "build packages with debugging symbols"
310 Build packages with debugging symbols enabled. All libraries
311 and binaries in the 'staging' directory will have debugging
312 symbols, which allows remote debugging even if libraries and
313 binaries are stripped on the target. Whether libraries and
314 binaries are stripped on the target is controlled by the
315 BR2_STRIP_* options below.
319 prompt "gcc debug level"
322 Set the debug level for gcc
327 Debug level 1 produces minimal information, enough
328 for making backtraces in parts of the program that
329 you don't plan to debug. This includes descriptions
330 of functions and external variables, but no information
331 about local variables and no line numbers.
336 The default gcc debug level is 2
341 Level 3 includes extra information, such as all the
342 macro definitions present in the program. Some debuggers
343 support macro expansion when you use -g3.
348 prompt "strip command for binaries on target"
349 default BR2_STRIP_strip
351 config BR2_STRIP_strip
353 depends on !BR2_PACKAGE_HOST_ELF2FLT
355 Binaries and libraries in the target filesystem will be
356 stripped using the normal 'strip' command. This allows to
357 save space, mainly by removing debugging symbols. Debugging
358 symbols on the target are needed for native debugging, but
359 not when remote debugging is used.
361 config BR2_STRIP_sstrip
363 select BR2_PACKAGE_SSTRIP_HOST
364 depends on !BR2_PACKAGE_HOST_ELF2FLT
365 depends on BR2_DEPRECATED_SINCE_2014_05
367 Binaries and libraries in the target filesystem will be
368 stripped using the 'sstrip' command, which strips a little
369 bit more than the traditional 'strip' command. This allows to
370 save space, mainly by removing debugging symbols. Debugging
371 symbols on the target are needed for native debugging, but
372 not when remote debugging is used.
374 config BR2_STRIP_none
377 Do not strip binaries and libraries in the target
381 config BR2_STRIP_EXCLUDE_FILES
382 string "executables that should not be stripped"
383 depends on !BR2_STRIP_none
386 You may specify a space-separated list of binaries and libraries
387 here that should not be stripped on the target.
389 config BR2_STRIP_EXCLUDE_DIRS
390 string "directories that should be skipped when stripping"
391 depends on !BR2_STRIP_none
394 You may specify a space-separated list of directories that should
395 be skipped when stripping. Binaries and libraries in these
396 directories will not be touched.
397 The directories should be specified relative to the target directory,
398 without leading slash.
401 prompt "gcc optimization level"
402 default BR2_OPTIMIZE_S
404 Set the optimization level for gcc
406 config BR2_OPTIMIZE_0
407 bool "optimization level 0"
409 Do not optimize. This is the default.
411 config BR2_OPTIMIZE_1
412 bool "optimization level 1"
414 Optimize. Optimizing compilation takes somewhat more time,
415 and a lot more memory for a large function. With -O, the
416 compiler tries to reduce code size and execution time,
417 without performing any optimizations that take a great deal
418 of compilation time. -O turns on the following optimization
419 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
420 -fcprop-registers -floop-optimize -fif-conversion
421 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
422 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
423 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
424 -O also turns on -fomit-frame-pointer on machines where doing
425 so does not interfere with debugging.
427 config BR2_OPTIMIZE_2
428 bool "optimization level 2"
430 Optimize even more. GCC performs nearly all supported optimizations
431 that do not involve a space-speed tradeoff. The compiler does not
432 perform loop unrolling or function inlining when you specify -O2.
433 As compared to -O, this option increases both compilation time and
434 the performance of the generated code. -O2 turns on all optimization
435 flags specified by -O. It also turns on the following optimization
436 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
437 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
438 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
439 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
440 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
441 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
442 -freorder-functions -falign-functions -falign-jumps -falign-loops
443 -falign-labels -ftree-vrp -ftree-pre
444 Please note the warning under -fgcse about invoking -O2 on programs
445 that use computed gotos.
447 config BR2_OPTIMIZE_3
448 bool "optimization level 3"
450 Optimize yet more. -O3 turns on all optimizations specified by -O2
451 and also turns on the -finline-functions, -funswitch-loops and
452 -fgcse-after-reload options.
454 config BR2_OPTIMIZE_S
455 bool "optimize for size"
457 Optimize for size. -Os enables all -O2 optimizations that do not
458 typically increase code size. It also performs further optimizations
459 designed to reduce code size. -Os disables the following optimization
460 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
461 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
462 -ftree-vect-loop-version
466 config BR2_ENABLE_SSP
467 bool "build code with Stack Smashing Protection"
468 depends on BR2_TOOLCHAIN_HAS_SSP
470 Enable stack smashing protection support using GCCs
471 -fstack-protector-all option.
473 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
476 Note that this requires the toolchain to have SSP
477 support. This is always the case for glibc and eglibc
478 toolchain, but is optional in uClibc toolchains.
480 comment "enabling Stack Smashing Protection requires support in the toolchain"
481 depends on !BR2_TOOLCHAIN_HAS_SSP
483 config BR2_PREFER_STATIC_LIB
484 bool "prefer static libraries"
486 Where possible, build and use static libraries for the target.
487 This potentially increases your code size and should only be
488 used if you know what you do.
489 The default is to build dynamic libraries and use those on
490 the target filesystem.
492 WARNING: This is highly experimental at the moment.
494 config BR2_PACKAGE_OVERRIDE_FILE
495 string "location of a package override file"
496 default "$(CONFIG_DIR)/local.mk"
498 A package override file is a short makefile that contains
499 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
500 which allows to tell Buildroot to use an existing directory
501 as the source directory for a particular package. See the
502 Buildroot documentation for more details on this feature.
504 config BR2_GLOBAL_PATCH_DIR
505 string "global patch directories"
507 You may specify a space separated list of one or more directories
508 containing global package patches. For a specific version
509 <packageversion> of a specific package <packagename>, patches are
512 First, the default Buildroot patch set for the package is applied
513 from the package's directory in Buildroot.
515 Then for every directory - <global-patch-dir> - that exists in
516 BR2_GLOBAL_PATCH_DIR, if the directory
517 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
518 *.patch files in this directory will be applied.
520 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
521 then all *.patch files in the directory will be applied.
525 source "toolchain/Config.in"
527 source "system/Config.in"
529 source "linux/Config.in"
531 source "package/Config.in"
533 source "fs/Config.in"
535 source "boot/Config.in"
537 source "package/Config.in.host"
539 source "Config.in.legacy"
541 menu "User-provided options"
542 depends on BR2_EXTERNAL != "support/dummy-external"
544 source "$BR2_EXTERNAL/Config.in"