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 config BR2_DEPRECATED
195 bool "Show packages that are deprecated or obsolete"
197 This option hides outdated/obsolete versions of packages.
199 config BR2_ENABLE_DEBUG
200 bool "build packages with debugging symbols"
201 select BR2_PACKAGE_GDB_SERVER
203 Build packages with debugging symbols
208 prompt "gcc debug level"
211 Set the debug level for gcc
216 Debug level 1 produces minimal information, enough
217 for making backtraces in parts of the program that
218 you don't plan to debug. This includes descriptions
219 of functions and external variables, but no information
220 about local variables and no line numbers.
225 The default gcc debug level is 2
230 Level 3 includes extra information, such as all the
231 macro definitions present in the program. Some debuggers
232 support macro expansion when you use -g3.
238 default BR2_STRIP_strip
240 Select whether to strip binaries and libraries for the target
242 strip is the normal strip command
243 sstrip is a strip that discards more than the normal strip
244 none do not strip (only for debugging!)
246 config BR2_STRIP_strip
248 depends on !BR2_ELF2FLT
250 strip is the normal strip command
252 config BR2_STRIP_sstrip
254 select BR2_PACKAGE_SSTRIP_HOST
255 depends on !BR2_ELF2FLT
257 sstrip is a strip that discards more than the normal strip
259 config BR2_STRIP_none
262 none do not strip (only for debugging!)
266 prompt "gcc optimization level"
267 default BR2_OPTIMIZE_S
269 Set the optimization level for gcc
271 config BR2_OPTIMIZE_0
272 bool "optimization level 0"
274 Do not optimize. This is the default.
276 config BR2_OPTIMIZE_1
277 bool "optimization level 1"
279 Optimize. Optimizing compilation takes somewhat more time,
280 and a lot more memory for a large function. With -O, the
281 compiler tries to reduce code size and execution time,
282 without performing any optimizations that take a great deal
283 of compilation time. -O turns on the following optimization
284 flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability
285 -fcprop-registers -floop-optimize -fif-conversion
286 -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts
287 -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename
288 -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants
289 -O also turns on -fomit-frame-pointer on machines where doing
290 so does not interfere with debugging.
292 config BR2_OPTIMIZE_2
293 bool "optimization level 2"
295 Optimize even more. GCC performs nearly all supported optimizations
296 that do not involve a space-speed tradeoff. The compiler does not
297 perform loop unrolling or function inlining when you specify -O2.
298 As compared to -O, this option increases both compilation time and
299 the performance of the generated code. -O2 turns on all optimization
300 flags specified by -O. It also turns on the following optimization
301 flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls
302 -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm
303 -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop
304 -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns
305 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
306 -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks
307 -freorder-functions -falign-functions -falign-jumps -falign-loops
308 -falign-labels -ftree-vrp -ftree-pre
309 Please note the warning under -fgcse about invoking -O2 on programs
310 that use computed gotos.
312 config BR2_OPTIMIZE_3
313 bool "optimization level 3"
315 Optimize yet more. -O3 turns on all optimizations specified by -O2
316 and also turns on the -finline-functions, -funswitch-loops and
317 -fgcse-after-reload options.
319 config BR2_OPTIMIZE_S
320 bool "optimize for size"
322 Optimize for size. -Os enables all -O2 optimizations that do not
323 typically increase code size. It also performs further optimizations
324 designed to reduce code size. -Os disables the following optimization
325 flags: -falign-functions -falign-jumps -falign-loops -falign-labels
326 -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
327 -ftree-vect-loop-version
331 config BR2_PREFER_STATIC_LIB
332 bool "prefer static libraries"
334 Where possible, build and use static libraries for the target.
335 This potentially increases your code size and should only be
336 used if you know what you do.
337 The default is to build dynamic libraries and use those on
338 the target filesystem.
340 WARNING: This is highly experimental at the moment.
342 config BR2_HAVE_DOCUMENTATION
343 bool "documentation on the target"
345 Install the documentation, including manual pages and info
346 pages, on the target.
347 If you say n here, your target will not contain any
350 config BR2_HAVE_DEVFILES
351 bool "development files in target filesystem"
353 Install headers and static libraries in the
356 config BR2_PACKAGE_OVERRIDE_FILE
357 string "location of a package override file"
358 default "$(TOPDIR)/local.mk"
360 A package override file is a short makefile that contains
361 variable definitions of the form <pkg>_OVERRIDE_SRCDIR,
362 which allows to tell Buildroot to use an existing directory
363 as the source directory for a particular package. See the
364 Buildroot documentation for more details on this feature.
368 source "toolchain/Config.in"
370 source "target/generic/Config.in"
372 source "package/Config.in"
374 source "fs/Config.in"
376 source "boot/Config.in"
378 source "linux/Config.in"