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 BUILDROOT_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
223 int "Number of jobs to run simultaneously (0 for auto)"
226 Number of jobs to run simultaneously. If 0, determine
227 automatically according to number of CPUs on the host
231 bool "Enable compiler cache"
233 This option will enable the use of ccache, a compiler
234 cache. It will cache the result of previous builds to speed
235 up future builds. The cache is stored in
236 $HOME/.buildroot-ccache.
238 Note that Buildroot does not try to invalidate the cache
239 contents when the compiler changes in an incompatible
240 way. Therefore, if you make a change to the compiler version
241 and/or configuration, you are responsible for purging the
242 ccache cache by removing the $HOME/.buildroot-ccache
245 config BR2_CCACHE_DIR
246 string "Compiler cache location"
247 depends on BR2_CCACHE
248 default "$(HOME)/.buildroot-ccache"
250 Where ccache should store cached files.
252 config BR2_DEPRECATED
253 bool "Show packages that are deprecated or obsolete"
255 This option hides outdated/obsolete versions of packages.
257 config BR2_ENABLE_DEBUG
258 bool "build packages with debugging symbols"
260 Build packages with debugging symbols enabled. All libraries
261 and binaries in the 'staging' directory will have debugging
262 symbols, which allows remote debugging even if libraries and
263 binaries are stripped on the target. Whether libraries and
264 binaries are stripped on the target is controlled by the
265 BR2_STRIP_* options below.
269 prompt "gcc debug level"
272 Set the debug level for gcc
277 Debug level 1 produces minimal information, enough
278 for making backtraces in parts of the program that
279 you don't plan to debug. This includes descriptions
280 of functions and external variables, but no information
281 about local variables and no line numbers.
286 The default gcc debug level is 2
291 Level 3 includes extra information, such as all the
292 macro definitions present in the program. Some debuggers
293 support macro expansion when you use -g3.
298 prompt "strip command for binaries on target"
299 default BR2_STRIP_strip
301 config BR2_STRIP_strip
303 depends on !BR2_PACKAGE_HOST_ELF2FLT
305 Binaries and libraries in the target filesystem will be
306 stripped using the normal 'strip' command. This allows to
307 save space, mainly by removing debugging symbols. Debugging
308 symbols on the target are needed for native debugging, but
309 not when remote debugging is used.
311 config BR2_STRIP_sstrip
313 select BR2_PACKAGE_SSTRIP_HOST
314 depends on !BR2_PACKAGE_HOST_ELF2FLT
316 Binaries and libraries in the target filesystem will be
317 stripped using the 'sstrip' command, which strips a little
318 bit more than the traditional 'strip' command. This allows to
319 save space, mainly by removing debugging symbols. Debugging
320 symbols on the target are needed for native debugging, but
321 not when remote debugging is used.
323 config BR2_STRIP_none
326 Do not strip binaries and libraries in the target
330 config BR2_STRIP_EXCLUDE_FILES
331 string "executables that should not be stripped"
332 depends on !BR2_STRIP_none
335 You may specify a space-separated list of binaries and libraries
336 here that should not be stripped on the target.
338 config BR2_STRIP_EXCLUDE_DIRS
339 string "directories that should be skipped when stripping"
340 depends on !BR2_STRIP_none
343 You may specify a space-separated list of directories that should
344 be skipped when stripping. Binaries and libraries in these
345 directories will not be touched.
346 The directories should be specified relative to the target directory,
347 without leading slash.
350 prompt "gcc optimization level"
351 default BR2_OPTIMIZE_S
353 Set the optimization level for gcc
355 config BR2_OPTIMIZE_0
356 bool "optimization level 0"
358 Do not optimize. This is the default.
360 config BR2_OPTIMIZE_1
361 bool "optimization level 1"
363 Optimize. Optimizing compilation takes somewhat more time,
364 and a lot more memory for a large function. With -O, the
365 compiler tries to reduce code size and execution time,
366 without performing any optimizations that take a great deal
367 of compilation time. -O turns on the following optimization
368 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
369 -fcprop-registers -floop-optimize -fif-conversion
370 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
371 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
372 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
373 -O also turns on -fomit-frame-pointer on machines where doing
374 so does not interfere with debugging.
376 config BR2_OPTIMIZE_2
377 bool "optimization level 2"
379 Optimize even more. GCC performs nearly all supported optimizations
380 that do not involve a space-speed tradeoff. The compiler does not
381 perform loop unrolling or function inlining when you specify -O2.
382 As compared to -O, this option increases both compilation time and
383 the performance of the generated code. -O2 turns on all optimization
384 flags specified by -O. It also turns on the following optimization
385 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
386 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
387 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
388 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
389 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
390 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
391 -freorder-functions -falign-functions -falign-jumps -falign-loops
392 -falign-labels -ftree-vrp -ftree-pre
393 Please note the warning under -fgcse about invoking -O2 on programs
394 that use computed gotos.
396 config BR2_OPTIMIZE_3
397 bool "optimization level 3"
399 Optimize yet more. -O3 turns on all optimizations specified by -O2
400 and also turns on the -finline-functions, -funswitch-loops and
401 -fgcse-after-reload options.
403 config BR2_OPTIMIZE_S
404 bool "optimize for size"
406 Optimize for size. -Os enables all -O2 optimizations that do not
407 typically increase code size. It also performs further optimizations
408 designed to reduce code size. -Os disables the following optimization
409 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
410 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
411 -ftree-vect-loop-version
415 config BR2_ENABLE_SSP
416 bool "build code with Stack Smashing Protection"
417 depends on BR2_TOOLCHAIN_HAS_SSP
419 Enable stack smashing protection support using GCCs
420 -fstack-protector-all option.
422 See http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
425 Note that this requires the toolchain to have SSP
426 support. This is always the case for glibc and eglibc
427 toolchain, but is optional in uClibc toolchains.
429 comment "enabling Stack Smashing Protection requires support in the toolchain"
430 depends on !BR2_TOOLCHAIN_HAS_SSP
432 config BR2_PREFER_STATIC_LIB
433 bool "prefer static libraries"
435 Where possible, build and use static libraries for the target.
436 This potentially increases your code size and should only be
437 used if you know what you do.
438 The default is to build dynamic libraries and use those on
439 the target filesystem.
441 WARNING: This is highly experimental at the moment.
443 config BR2_HAVE_DOCUMENTATION
444 bool "documentation on the target"
445 # We no longer want to support a toolchain on the target
446 depends on BR2_DEPRECATED
448 Install the documentation, including manual pages and info
449 pages, on the target.
450 If you say n here, your target will not contain any
453 config BR2_PACKAGE_OVERRIDE_FILE
454 string "location of a package override file"
455 default "$(TOPDIR)/local.mk"
457 A package override file is a short makefile that contains
458 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
459 which allows to tell Buildroot to use an existing directory
460 as the source directory for a particular package. See the
461 Buildroot documentation for more details on this feature.
463 config BR2_GLOBAL_PATCH_DIR
464 string "global patch directories"
466 You may specify a space separated list of one or more directories
467 containing global package patches. For a specific version
468 <packageversion> of a specific package <packagename>, patches are
471 First, the default Buildroot patch set for the package is applied
472 from the package's directory in Buildroot.
474 Then for every directory - <global-patch-dir> - that exists in
475 BR2_GLOBAL_PATCH_DIR, if the directory
476 <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
477 *.patch files in this directory will be applied.
479 Otherwise, if the directory <global-patch-dir>/<packagename> exists,
480 then all *.patch files in the directory will be applied.
484 source "toolchain/Config.in"
486 source "system/Config.in"
488 source "linux/Config.in"
490 source "package/Config.in"
492 source "fs/Config.in"
494 source "boot/Config.in"
496 source "package/Config.in.host"
498 source "Config.in.legacy"
500 menu "User-provided options"
501 depends on BR2_EXTERNAL != "support/dummy-external"
503 source "$BR2_EXTERNAL/Config.in"