3 mainmenu "Buildroot $BR2_VERSION Configuration"
5 config BR2_HAVE_DOT_CONFIG
11 option env="BR2_VERSION_FULL"
13 source "target/Config.in.arch"
21 default "wget --passive-ftp -nd -t 3"
24 string "Subversion (svn) command"
28 string "Bazaar (bzr) command"
36 string "Local files retrieval command"
40 string "Secure copy (scp) command"
44 string "Secure shell (ssh) command"
48 string "Mercurial (hg) command"
55 Command to be used to extract a gzip'ed file to stdout.
56 zcat is identical to gunzip -c except that the former may
57 not be available on your system.
58 Default is "gzip -d -c"
59 Other possible values include "gunzip -c" or "zcat".
62 string "bzcat command"
65 Command to be used to extract a bzip2'ed file to stdout.
66 bzcat is identical to bunzip2 -c except that the former may
67 not be available on your system.
69 Other possible values include "bunzip2 -c" or "bzip2 -d -c".
72 string "xzcat command"
75 Command to be used to extract a xz'ed file to stdout.
78 config BR2_TAR_OPTIONS
82 Options to pass to tar when extracting the sources.
83 E.g. " -v --exclude='*.svn*'" to exclude all .svn internal files
90 default "$(TOPDIR)/dl"
92 Directory to store all the source files that we need to fetch.
93 If the Linux shell environment has defined the BUILDROOT_DL_DIR
94 environment variable, then this overrides this configuration item.
96 The default is $(TOPDIR)/dl
100 default "$(BASE_DIR)/host"
102 Directory to store all the binary files that are built for the host.
103 This includes the cross compilation toolchain when building the
104 internal buildroot toolchain.
106 The default is $(BASE_DIR)/host
108 menu "Mirrors and Download locations"
110 config BR2_PRIMARY_SITE
111 string "Primary download site"
114 Primary site to download from. If this option is set then buildroot
115 will try to download package source first from this site and try the
116 default if the file is not found.
117 Valid URIs are URIs recognized by $(WGET) and scp URIs of the form
118 scp://[user@]host:path.
119 NOTE: This works for all packages using the central package
120 infrastructure (generic, autotools, cmake, ...)
122 config BR2_BACKUP_SITE
123 string "Backup download site"
124 default "http://sources.buildroot.net/"
126 Backup site to download from. If this option is set then buildroot
127 will fall back to download package sources from here if the
128 normal location fails.
130 config BR2_SOURCEFORGE_MIRROR
131 string "Sourceforge mirror site"
134 Sourceforge has a system of mirror sites. Some sites may be
135 closer to your location, and sometimes mirror sites go down
136 and are no longer available. This option allows you to select
137 your preferred Sourceforge mirror site.
139 The list of mirrors is available here:
140 http://sourceforge.net/apps/trac/sourceforge/wiki/Mirrors
142 config BR2_KERNEL_MIRROR
143 string "Kernel.org mirror"
144 default "http://www.kernel.org/pub/"
146 kernel.org is mirrored on a number of servers around the world.
147 The following allows you to select your preferred mirror.
149 Have a look on the kernel.org site for a list of mirrors, then enter
150 the URL to the base directory. Examples:
152 http://www.XX.kernel.org/pub (XX = country code)
153 http://mirror.aarnet.edu.au/pub/ftp.kernel.org
155 config BR2_GNU_MIRROR
156 string "GNU Software mirror"
157 default "http://ftp.gnu.org/pub/gnu"
159 GNU has multiple software mirrors scattered around the world.
160 The following allows you to select your preferred mirror.
162 Have a look on the gnu.org site for a list of mirrors, then enter
163 the URL to the base directory. Examples:
165 http://ftp.gnu.org/pub/gnu
166 http://mirror.aarnet.edu.au/pub/gnu
168 config BR2_DEBIAN_MIRROR
169 string "Debian Software mirror"
170 default "http://ftp.debian.org"
172 Debian has multiple software mirrors scattered around the world.
173 The following allows you to select your preferred mirror.
175 Usually, just add your country code like XX here:
176 http://ftp.XX.debian.org
181 int "Number of jobs to run simultaneously"
184 Number of jobs to run simultaneously
187 bool "Enable compiler cache"
189 This option will enable the use of ccache, a compiler
190 cache. It will cache the result of previous builds to speed
191 up future builds. The cache is stored in
192 $HOME/.buildroot-ccache.
194 Note that Buildroot does not try to invalidate the cache
195 contents when the compiler changes in an incompatible
196 way. Therefore, if you make a change to the compiler version
197 and/or configuration, you are responsible for purging the
198 ccache cache by removing the $HOME/.buildroot-ccache
201 config BR2_DEPRECATED
202 bool "Show packages that are deprecated or obsolete"
204 This option hides outdated/obsolete versions of packages.
206 config BR2_ENABLE_DEBUG
207 bool "build packages with debugging symbols"
209 Build packages with debugging symbols enabled. All libraries
210 and binaries in the 'staging' directory will have debugging
211 symbols, which allows remote debugging even if libraries and
212 binaries are stripped on the target. Whether libraries and
213 binaries are stripped on the target is controlled by the
214 BR2_STRIP_* options below.
218 prompt "gcc debug level"
221 Set the debug level for gcc
226 Debug level 1 produces minimal information, enough
227 for making backtraces in parts of the program that
228 you don't plan to debug. This includes descriptions
229 of functions and external variables, but no information
230 about local variables and no line numbers.
235 The default gcc debug level is 2
240 Level 3 includes extra information, such as all the
241 macro definitions present in the program. Some debuggers
242 support macro expansion when you use -g3.
247 prompt "strip command for binaries on target"
248 default BR2_STRIP_strip
250 config BR2_STRIP_strip
252 depends on !BR2_ELF2FLT
254 Binaries and libraries in the target filesystem will be
255 stripped using the normal 'strip' command. This allows to
256 save space, mainly by removing debugging symbols. Debugging
257 symbols on the target are needed for native debugging, but
258 not when remote debugging is used.
260 config BR2_STRIP_sstrip
262 select BR2_PACKAGE_SSTRIP_HOST
263 depends on !BR2_ELF2FLT
265 Binaries and libraries in the target filesystem will be
266 stripped using the 'sstrip' command, which strips a little
267 bit more than the traditional 'strip' command. This allows to
268 save space, mainly by removing debugging symbols. Debugging
269 symbols on the target are needed for native debugging, but
270 not when remote debugging is used.
272 config BR2_STRIP_none
275 Do not strip binaries and libraries in the target
280 prompt "gcc optimization level"
281 default BR2_OPTIMIZE_S
283 Set the optimization level for gcc
285 config BR2_OPTIMIZE_0
286 bool "optimization level 0"
288 Do not optimize. This is the default.
290 config BR2_OPTIMIZE_1
291 bool "optimization level 1"
293 Optimize. Optimizing compilation takes somewhat more time,
294 and a lot more memory for a large function. With -O, the
295 compiler tries to reduce code size and execution time,
296 without performing any optimizations that take a great deal
297 of compilation time. -O turns on the following optimization
298 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
299 -fcprop-registers -floop-optimize -fif-conversion
300 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
301 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
302 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
303 -O also turns on -fomit-frame-pointer on machines where doing
304 so does not interfere with debugging.
306 config BR2_OPTIMIZE_2
307 bool "optimization level 2"
309 Optimize even more. GCC performs nearly all supported optimizations
310 that do not involve a space-speed tradeoff. The compiler does not
311 perform loop unrolling or function inlining when you specify -O2.
312 As compared to -O, this option increases both compilation time and
313 the performance of the generated code. -O2 turns on all optimization
314 flags specified by -O. It also turns on the following optimization
315 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
316 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
317 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
318 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
319 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
320 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
321 -freorder-functions -falign-functions -falign-jumps -falign-loops
322 -falign-labels -ftree-vrp -ftree-pre
323 Please note the warning under -fgcse about invoking -O2 on programs
324 that use computed gotos.
326 config BR2_OPTIMIZE_3
327 bool "optimization level 3"
329 Optimize yet more. -O3 turns on all optimizations specified by -O2
330 and also turns on the -finline-functions, -funswitch-loops and
331 -fgcse-after-reload options.
333 config BR2_OPTIMIZE_S
334 bool "optimize for size"
336 Optimize for size. -Os enables all -O2 optimizations that do not
337 typically increase code size. It also performs further optimizations
338 designed to reduce code size. -Os disables the following optimization
339 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
340 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
341 -ftree-vect-loop-version
345 config BR2_PREFER_STATIC_LIB
346 bool "prefer static libraries"
348 Where possible, build and use static libraries for the target.
349 This potentially increases your code size and should only be
350 used if you know what you do.
351 The default is to build dynamic libraries and use those on
352 the target filesystem.
354 WARNING: This is highly experimental at the moment.
356 config BR2_HAVE_DOCUMENTATION
357 bool "documentation on the target"
359 Install the documentation, including manual pages and info
360 pages, on the target.
361 If you say n here, your target will not contain any
364 config BR2_HAVE_DEVFILES
365 bool "development files in target filesystem"
367 Install headers and static libraries in the
370 config BR2_PACKAGE_OVERRIDE_FILE
371 string "location of a package override file"
372 default "$(TOPDIR)/local.mk"
374 A package override file is a short makefile that contains
375 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
376 which allows to tell Buildroot to use an existing directory
377 as the source directory for a particular package. See the
378 Buildroot documentation for more details on this feature.
382 source "toolchain/Config.in"
384 source "target/generic/Config.in"
386 source "package/Config.in"
388 source "package/Config.in.host"
390 source "fs/Config.in"
392 source "boot/Config.in"
394 source "linux/Config.in"