3 mainmenu "Buildroot $BR2_VERSION Configuration"
5 config BR2_HAVE_DOT_CONFIG
11 option env="BR2_VERSION_FULL"
19 option env="BR2_EXTERNAL"
21 # Hidden boolean selected by packages in need of Java in order to build
23 config BR2_NEEDS_HOST_JAVA
26 # Hidden boolean selected by pre-built packages for x86, when they
27 # need to run on x86-64 machines (example: pre-built external
28 # toolchains, binary tools like SAM-BA, etc.).
29 config BR2_HOSTARCH_NEEDS_IA32_LIBS
32 # Hidden boolean selected by packages that need to build 32 bits
33 # binaries with the host compiler, even on 64 bits build machines (e.g
35 config BR2_HOSTARCH_NEEDS_IA32_COMPILER
38 source "arch/Config.in"
46 default "wget --passive-ftp -nd -t 3"
49 string "Subversion (svn) command"
53 string "Bazaar (bzr) command"
65 string "Local files retrieval command"
69 string "Secure copy (scp) command"
73 string "Secure shell (ssh) command"
77 string "Mercurial (hg) command"
84 Command to be used to extract a gzip'ed file to stdout.
85 zcat is identical to gunzip -c except that the former may
86 not be available on your system.
87 Default is "gzip -d -c"
88 Other possible values include "gunzip -c" or "zcat".
91 string "bzcat command"
94 Command to be used to extract a bzip2'ed file to stdout.
95 bzcat is identical to bunzip2 -c except that the former may
96 not be available on your system.
98 Other possible values include "bunzip2 -c" or "bzip2 -d -c".
101 string "xzcat command"
104 Command to be used to extract a xz'ed file to stdout.
107 config BR2_TAR_OPTIONS
111 Options to pass to tar when extracting the sources.
112 E.g. " -v --exclude='*.svn*'" to exclude all .svn internal files
117 config BR2_DEFCONFIG_FROM_ENV
119 option env="BR2_DEFCONFIG"
122 string "Location to save buildroot config"
123 default BR2_DEFCONFIG_FROM_ENV if BR2_DEFCONFIG_FROM_ENV != ""
124 default "$(CONFIG_DIR)/defconfig"
126 When running 'make savedefconfig', the defconfig file will be saved
130 string "Download dir"
131 default "$(TOPDIR)/dl"
133 Directory to store all the source files that we need to fetch.
134 If the Linux shell environment has defined the BR2_DL_DIR
135 environment variable, then this overrides this configuration item.
137 The default is $(TOPDIR)/dl
141 default "$(BASE_DIR)/host"
143 Directory to store all the binary files that are built for the host.
144 This includes the cross compilation toolchain when building the
145 internal buildroot toolchain.
147 The default is $(BASE_DIR)/host
149 menu "Mirrors and Download locations"
151 config BR2_PRIMARY_SITE
152 string "Primary download site"
155 Primary site to download from. If this option is set then buildroot
156 will try to download package source first from this site and try the
157 default if the file is not found.
158 Valid URIs are URIs recognized by $(WGET) and scp URIs of the form
159 scp://[user@]host:path.
160 NOTE: This works for all packages using the central package
161 infrastructure (generic, autotools, cmake, ...)
163 config BR2_PRIMARY_SITE_ONLY
164 bool "Only allow downloads from primary download site"
165 depends on BR2_PRIMARY_SITE != ""
167 If this option is enabled, downloads will only be attempted
168 from the primary download site. Other locations, like the
169 package's official download location or the backup download
170 site, will not be considered. Therefore, if the package is
171 not present on the primary site, the download fails.
173 This is useful for project developers who want to ensure
174 that the project can be built even if the upstream tarball
177 if !BR2_PRIMARY_SITE_ONLY
179 config BR2_BACKUP_SITE
180 string "Backup download site"
181 default "http://sources.buildroot.net"
183 Backup site to download from. If this option is set then buildroot
184 will fall back to download package sources from here if the
185 normal location fails.
187 config BR2_KERNEL_MIRROR
188 string "Kernel.org mirror"
189 default "https://www.kernel.org/pub"
191 kernel.org is mirrored on a number of servers around the world.
192 The following allows you to select your preferred mirror.
194 Have a look on the kernel.org site for a list of mirrors, then enter
195 the URL to the base directory. Examples:
197 http://www.XX.kernel.org/pub (XX = country code)
198 http://mirror.aarnet.edu.au/pub/ftp.kernel.org
200 config BR2_GNU_MIRROR
201 string "GNU Software mirror"
202 default "http://ftp.gnu.org/pub/gnu"
204 GNU has multiple software mirrors scattered around the world.
205 The following allows you to select your preferred mirror.
207 Have a look on the gnu.org site for a list of mirrors, then enter
208 the URL to the base directory. Examples:
210 http://ftp.gnu.org/pub/gnu
211 http://mirror.aarnet.edu.au/pub/gnu
213 config BR2_DEBIAN_MIRROR
214 string "Debian Software mirror"
215 default "http://ftp.debian.org"
217 Debian has multiple software mirrors scattered around the world.
218 The following allows you to select your preferred mirror.
220 Usually, just add your country code like XX here:
221 http://ftp.XX.debian.org
225 config BR2_LUAROCKS_MIRROR
226 string "LuaRocks mirror"
227 default "http://luarocks.org/repositories/rocks"
231 See http://luarocks.org
233 config BR2_CPAN_MIRROR
234 string "CPAN mirror (Perl packages)"
235 default "http://search.cpan.org/CPAN"
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. 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 $HOME/.buildroot-ccache
269 config BR2_CCACHE_DIR
270 string "Compiler cache location"
271 depends on BR2_CCACHE
272 default "$(HOME)/.buildroot-ccache"
274 Where ccache should store cached files.
276 config BR2_DEPRECATED
277 bool "Show packages that are deprecated or obsolete"
279 This option hides outdated/obsolete versions of packages.
283 config BR2_DEPRECATED_SINCE_2013_11
287 config BR2_DEPRECATED_SINCE_2014_02
291 config BR2_DEPRECATED_SINCE_2014_05
297 config BR2_ENABLE_DEBUG
298 bool "build packages with debugging symbols"
300 Build packages with debugging symbols enabled. All libraries
301 and binaries in the 'staging' directory will have debugging
302 symbols, which allows remote debugging even if libraries and
303 binaries are stripped on the target. Whether libraries and
304 binaries are stripped on the target is controlled by the
305 BR2_STRIP_* options below.
309 prompt "gcc debug level"
312 Set the debug level for gcc
317 Debug level 1 produces minimal information, enough
318 for making backtraces in parts of the program that
319 you don't plan to debug. This includes descriptions
320 of functions and external variables, but no information
321 about local variables and no line numbers.
326 The default gcc debug level is 2
331 Level 3 includes extra information, such as all the
332 macro definitions present in the program. Some debuggers
333 support macro expansion when you use -g3.
338 prompt "strip command for binaries on target"
339 default BR2_STRIP_strip
341 config BR2_STRIP_strip
343 depends on !BR2_PACKAGE_HOST_ELF2FLT
345 Binaries and libraries in the target filesystem will be
346 stripped using the normal '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_sstrip
353 select BR2_PACKAGE_SSTRIP_HOST
354 depends on !BR2_PACKAGE_HOST_ELF2FLT
355 depends on BR2_DEPRECATED_SINCE_2014_05
357 Binaries and libraries in the target filesystem will be
358 stripped using the 'sstrip' command, which strips a little
359 bit more than the traditional 'strip' command. This allows to
360 save space, mainly by removing debugging symbols. Debugging
361 symbols on the target are needed for native debugging, but
362 not when remote debugging is used.
364 config BR2_STRIP_none
367 Do not strip binaries and libraries in the target
371 config BR2_STRIP_EXCLUDE_FILES
372 string "executables that should not be stripped"
373 depends on !BR2_STRIP_none
376 You may specify a space-separated list of binaries and libraries
377 here that should not be stripped on the target.
379 config BR2_STRIP_EXCLUDE_DIRS
380 string "directories that should be skipped when stripping"
381 depends on !BR2_STRIP_none
384 You may specify a space-separated list of directories that should
385 be skipped when stripping. Binaries and libraries in these
386 directories will not be touched.
387 The directories should be specified relative to the target directory,
388 without leading slash.
391 prompt "gcc optimization level"
392 default BR2_OPTIMIZE_S
394 Set the optimization level for gcc
396 config BR2_OPTIMIZE_0
397 bool "optimization level 0"
399 Do not optimize. This is the default.
401 config BR2_OPTIMIZE_1
402 bool "optimization level 1"
404 Optimize. Optimizing compilation takes somewhat more time,
405 and a lot more memory for a large function. With -O, the
406 compiler tries to reduce code size and execution time,
407 without performing any optimizations that take a great deal
408 of compilation time. -O turns on the following optimization
409 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
410 -fcprop-registers -floop-optimize -fif-conversion
411 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
412 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
413 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
414 -O also turns on -fomit-frame-pointer on machines where doing
415 so does not interfere with debugging.
417 config BR2_OPTIMIZE_2
418 bool "optimization level 2"
420 Optimize even more. GCC performs nearly all supported optimizations
421 that do not involve a space-speed tradeoff. The compiler does not
422 perform loop unrolling or function inlining when you specify -O2.
423 As compared to -O, this option increases both compilation time and
424 the performance of the generated code. -O2 turns on all optimization
425 flags specified by -O. It also turns on the following optimization
426 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
427 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
428 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
429 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
430 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
431 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
432 -freorder-functions -falign-functions -falign-jumps -falign-loops
433 -falign-labels -ftree-vrp -ftree-pre
434 Please note the warning under -fgcse about invoking -O2 on programs
435 that use computed gotos.
437 config BR2_OPTIMIZE_3
438 bool "optimization level 3"
440 Optimize yet more. -O3 turns on all optimizations specified by -O2
441 and also turns on the -finline-functions, -funswitch-loops and
442 -fgcse-after-reload options.
444 config BR2_OPTIMIZE_S
445 bool "optimize for size"
447 Optimize for size. -Os enables all -O2 optimizations that do not
448 typically increase code size. It also performs further optimizations
449 designed to reduce code size. -Os disables the following optimization
450 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
451 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
452 -ftree-vect-loop-version
456 config BR2_ENABLE_SSP
457 bool "build code with Stack Smashing Protection"
458 depends on BR2_TOOLCHAIN_HAS_SSP
460 Enable stack smashing protection support using GCCs
461 -fstack-protector-all option.
463 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
466 Note that this requires the toolchain to have SSP
467 support. This is always the case for glibc and eglibc
468 toolchain, but is optional in uClibc toolchains.
470 comment "enabling Stack Smashing Protection requires support in the toolchain"
471 depends on !BR2_TOOLCHAIN_HAS_SSP
473 config BR2_PREFER_STATIC_LIB
474 bool "prefer static libraries"
476 Where possible, build and use static libraries for the target.
477 This potentially increases your code size and should only be
478 used if you know what you do.
479 The default is to build dynamic libraries and use those on
480 the target filesystem.
482 WARNING: This is highly experimental at the moment.
484 config BR2_PACKAGE_OVERRIDE_FILE
485 string "location of a package override file"
486 default "$(CONFIG_DIR)/local.mk"
488 A package override file is a short makefile that contains
489 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
490 which allows to tell Buildroot to use an existing directory
491 as the source directory for a particular package. See the
492 Buildroot documentation for more details on this feature.
494 config BR2_GLOBAL_PATCH_DIR
495 string "global patch directories"
497 You may specify a space separated list of one or more directories
498 containing global package patches. For a specific version
499 <packageversion> of a specific package <packagename>, patches are
502 First, the default Buildroot patch set for the package is applied
503 from the package's directory in Buildroot.
505 Then for every directory - <global-patch-dir> - that exists in
506 BR2_GLOBAL_PATCH_DIR, if the directory
507 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
508 *.patch files in this directory will be applied.
510 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
511 then all *.patch files in the directory will be applied.
515 source "toolchain/Config.in"
517 source "system/Config.in"
519 source "linux/Config.in"
521 source "package/Config.in"
523 source "fs/Config.in"
525 source "boot/Config.in"
527 source "package/Config.in.host"
529 source "Config.in.legacy"
531 menu "User-provided options"
532 depends on BR2_EXTERNAL != "support/dummy-external"
534 source "$BR2_EXTERNAL/Config.in"