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
225 config BR2_LUAROCKS_MIRROR
226 string "LuaRocks mirror"
227 default "http://rocks.moonscript.org"
231 See http://luarocks.org
233 config BR2_CPAN_MIRROR
234 string "CPAN mirror (Perl packages)"
235 default "http://cpan.metacpan.org"
237 CPAN (Comprehensive Perl Archive Network) is a repository
238 of Perl packages. It has multiple software mirrors scattered
239 around the world. This option allows you to select a mirror.
241 The list of mirrors is available at:
242 http://search.cpan.org/mirror
247 int "Number of jobs to run simultaneously (0 for auto)"
250 Number of jobs to run simultaneously. If 0, determine
251 automatically according to number of CPUs on the host
255 bool "Enable compiler cache"
257 This option will enable the use of ccache, a compiler
258 cache. It will cache the result of previous builds to speed
259 up future builds. By default, the cache is stored in
260 $HOME/.buildroot-ccache.
262 Note that Buildroot does not try to invalidate the cache
263 contents when the compiler changes in an incompatible
264 way. Therefore, if you make a change to the compiler version
265 and/or configuration, you are responsible for purging the
266 ccache cache by removing the $HOME/.buildroot-ccache
271 config BR2_CCACHE_DIR
272 string "Compiler cache location"
273 default "$(HOME)/.buildroot-ccache"
275 Where ccache should store cached files.
277 config BR2_CCACHE_INITIAL_SETUP
278 string "Compiler cache initial setup"
280 Initial ccache settings to apply, such as --max-files or --max-size.
282 For example, if your project is known to require more space than the
283 default max cache size, then you might want to increase the cache size
284 to a suitable amount using the -M (--max-size) option.
286 The string you specify here is passed verbatim to ccache. Refer to
287 ccache documentation for more details.
289 These initial settings are applied after ccache has been compiled.
293 config BR2_DEPRECATED
294 bool "Show options and packages that are deprecated or obsolete"
296 This option shows outdated/obsolete versions of packages and
297 options that are otherwise hidden.
301 config BR2_DEPRECATED_SINCE_2013_11
305 config BR2_DEPRECATED_SINCE_2014_02
309 config BR2_DEPRECATED_SINCE_2014_05
313 config BR2_DEPRECATED_SINCE_2014_08
317 config BR2_DEPRECATED_SINCE_2015_02
323 config BR2_ENABLE_DEBUG
324 bool "build packages with debugging symbols"
326 Build packages with debugging symbols enabled. All libraries
327 and binaries in the 'staging' directory will have debugging
328 symbols, which allows remote debugging even if libraries and
329 binaries are stripped on the target. Whether libraries and
330 binaries are stripped on the target is controlled by the
331 BR2_STRIP_* options below.
335 prompt "gcc debug level"
338 Set the debug level for gcc
343 Debug level 1 produces minimal information, enough
344 for making backtraces in parts of the program that
345 you don't plan to debug. This includes descriptions
346 of functions and external variables, but no information
347 about local variables and no line numbers.
352 The default gcc debug level is 2
357 Level 3 includes extra information, such as all the
358 macro definitions present in the program. Some debuggers
359 support macro expansion when you use -g3.
364 prompt "strip command for binaries on target"
365 default BR2_STRIP_strip
367 config BR2_STRIP_strip
369 depends on !BR2_PACKAGE_HOST_ELF2FLT
371 Binaries and libraries in the target filesystem will be
372 stripped using the normal 'strip' command. This allows to
373 save space, mainly by removing debugging symbols. Debugging
374 symbols on the target are needed for native debugging, but
375 not when remote debugging is used.
377 config BR2_STRIP_sstrip
379 select BR2_PACKAGE_SSTRIP_HOST
380 depends on !BR2_PACKAGE_HOST_ELF2FLT
381 depends on BR2_DEPRECATED_SINCE_2014_05
383 Binaries and libraries in the target filesystem will be
384 stripped using the 'sstrip' command, which strips a little
385 bit more than the traditional 'strip' command. This allows to
386 save space, mainly by removing debugging symbols. Debugging
387 symbols on the target are needed for native debugging, but
388 not when remote debugging is used.
390 config BR2_STRIP_none
393 Do not strip binaries and libraries in the target
397 config BR2_STRIP_EXCLUDE_FILES
398 string "executables that should not be stripped"
399 depends on !BR2_STRIP_none
402 You may specify a space-separated list of binaries and libraries
403 here that should not be stripped on the target.
405 config BR2_STRIP_EXCLUDE_DIRS
406 string "directories that should be skipped when stripping"
407 depends on !BR2_STRIP_none
410 You may specify a space-separated list of directories that should
411 be skipped when stripping. Binaries and libraries in these
412 directories will not be touched.
413 The directories should be specified relative to the target directory,
414 without leading slash.
417 prompt "gcc optimization level"
418 default BR2_OPTIMIZE_S
420 Set the optimization level for gcc
422 config BR2_OPTIMIZE_0
423 bool "optimization level 0"
425 Do not optimize. This is the default.
427 config BR2_OPTIMIZE_1
428 bool "optimization level 1"
430 Optimize. Optimizing compilation takes somewhat more time,
431 and a lot more memory for a large function. With -O, the
432 compiler tries to reduce code size and execution time,
433 without performing any optimizations that take a great deal
434 of compilation time. -O turns on the following optimization
435 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
436 -fcprop-registers -floop-optimize -fif-conversion
437 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
438 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
439 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
440 -O also turns on -fomit-frame-pointer on machines where doing
441 so does not interfere with debugging.
443 config BR2_OPTIMIZE_2
444 bool "optimization level 2"
446 Optimize even more. GCC performs nearly all supported optimizations
447 that do not involve a space-speed tradeoff. The compiler does not
448 perform loop unrolling or function inlining when you specify -O2.
449 As compared to -O, this option increases both compilation time and
450 the performance of the generated code. -O2 turns on all optimization
451 flags specified by -O. It also turns on the following optimization
452 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
453 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
454 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
455 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
456 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
457 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
458 -freorder-functions -falign-functions -falign-jumps -falign-loops
459 -falign-labels -ftree-vrp -ftree-pre
460 Please note the warning under -fgcse about invoking -O2 on programs
461 that use computed gotos.
463 config BR2_OPTIMIZE_3
464 bool "optimization level 3"
466 Optimize yet more. -O3 turns on all optimizations specified by -O2
467 and also turns on the -finline-functions, -funswitch-loops and
468 -fgcse-after-reload options.
470 config BR2_OPTIMIZE_S
471 bool "optimize for size"
473 Optimize for size. -Os enables all -O2 optimizations that do not
474 typically increase code size. It also performs further optimizations
475 designed to reduce code size. -Os disables the following optimization
476 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
477 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
478 -ftree-vect-loop-version
482 config BR2_GOOGLE_BREAKPAD_ENABLE
483 bool "Enable google-breakpad support"
484 select BR2_PACKAGE_GOOGLE_BREAKPAD
485 depends on BR2_INSTALL_LIBSTDCPP
486 depends on BR2_TOOLCHAIN_USES_GLIBC
487 depends on BR2_PACKAGE_GOOGLE_BREAKPAD_ARCH_SUPPORTS
489 This option will enable the use of google breakpad, a
490 library and tool suite that allows you to distribute an
491 application to users with compiler-provided debugging
492 information removed, record crashes in compact "minidump"
493 files, send them back to your server and produce C and C++
494 stack traces from these minidumps. Breakpad can also write
495 minidumps on request for programs that have not crashed.
497 if BR2_GOOGLE_BREAKPAD_ENABLE
499 config BR2_GOOGLE_BREAKPAD_INCLUDE_FILES
500 string "List of executables and libraries to extract symbols from"
503 You may specify a space-separated list of binaries and
504 libraries with full paths relative to $(TARGET_DIR) of which
505 debug symbols will be dumped for further use with google
508 A directory structure that can be used by minidump-stackwalk
511 $(STAGING_DIR)/usr/share/google-breakpad-symbols
515 config BR2_ENABLE_SSP
516 bool "build code with Stack Smashing Protection"
517 depends on BR2_TOOLCHAIN_HAS_SSP
519 Enable stack smashing protection support using GCCs
520 -fstack-protector-all option.
522 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
525 Note that this requires the toolchain to have SSP
526 support. This is always the case for glibc and eglibc
527 toolchain, but is optional in uClibc toolchains.
529 comment "enabling Stack Smashing Protection requires support in the toolchain"
530 depends on !BR2_TOOLCHAIN_HAS_SSP
532 config BR2_PREFER_STATIC_LIB
533 bool "build statically linked applications, no dynamic libraries"
535 Build all applications for the target statically linked.
536 This potentially increases your filesystem size and should only be
537 used if you know what you do.
539 Note that some applications cannot be build statically and so are
540 intentionally disabled.
542 The default (if this option is disabled) is to build dynamic
543 libraries and dynamically link applications to use those on the
547 config BR2_PACKAGE_OVERRIDE_FILE
548 string "location of a package override file"
549 default "$(CONFIG_DIR)/local.mk"
551 A package override file is a short makefile that contains
552 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
553 which allows to tell Buildroot to use an existing directory
554 as the source directory for a particular package. See the
555 Buildroot documentation for more details on this feature.
557 config BR2_GLOBAL_PATCH_DIR
558 string "global patch directories"
560 You may specify a space separated list of one or more directories
561 containing global package patches. For a specific version
562 <packageversion> of a specific package <packagename>, patches are
565 First, the default Buildroot patch set for the package is applied
566 from the package's directory in Buildroot.
568 Then for every directory - <global-patch-dir> - that exists in
569 BR2_GLOBAL_PATCH_DIR, if the directory
570 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
571 *.patch files in this directory will be applied.
573 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
574 then all *.patch files in the directory will be applied.
578 source "toolchain/Config.in"
580 source "system/Config.in"
582 source "linux/Config.in"
584 source "package/Config.in"
586 source "fs/Config.in"
588 source "boot/Config.in"
590 source "package/Config.in.host"
592 source "Config.in.legacy"
594 menu "User-provided options"
595 depends on BR2_EXTERNAL != "support/dummy-external"
597 source "$BR2_EXTERNAL/Config.in"