kernel: add some debloat patches, strip down procfs and make O_DIRECT support optiona...
[openwrt.git] / Config.in
1 # Copyright (C) 2006-2012 OpenWrt.org
2 #
3 # This is free software, licensed under the GNU General Public License v2.
4 # See /LICENSE for more information.
5 #
6
7 mainmenu "OpenWrt Configuration"
8
9 config HAVE_DOT_CONFIG
10         bool
11         default y
12
13 source "target/Config.in"
14
15 menu "Target Images"
16
17         menuconfig TARGET_ROOTFS_INITRAMFS
18                 bool "ramdisk"
19                 default y if USES_INITRAMFS
20                 help
21                   Embed the rootfs into the kernel (initramfs)
22
23                 choice
24                         prompt "Compression"
25                         default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_ar71xx
26                         default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_ramips
27                         default TARGET_INITRAMFS_COMPRESSION_NONE
28                         depends TARGET_ROOTFS_INITRAMFS
29                         help
30                           Select ramdisk compression.
31
32                         config TARGET_INITRAMFS_COMPRESSION_NONE
33                                 bool "none"
34
35                         config TARGET_INITRAMFS_COMPRESSION_GZIP
36                                 bool "gzip"
37
38                         config TARGET_INITRAMFS_COMPRESSION_BZIP2
39                                 bool "bzip2"
40
41                         config TARGET_INITRAMFS_COMPRESSION_LZMA
42                                 bool "lzma"
43
44                         config TARGET_INITRAMFS_COMPRESSION_LZO
45                                 bool "lzo"
46
47                         config TARGET_INITRAMFS_COMPRESSION_XZ
48                                 bool "xz"
49                 endchoice
50
51                 config EXTERNAL_CPIO
52                         string
53                         prompt "Use external cpio" if TARGET_ROOTFS_INITRAMFS
54                         default ""
55                         help
56                           Kernel uses specified external cpio as INITRAMFS_SOURCE
57
58         comment "Root filesystem archives"
59
60         config TARGET_ROOTFS_CPIOGZ
61                 bool "cpio.gz"
62                 default y if USES_CPIOGZ
63                 help
64                   Build a compressed cpio archive of the the root filesystem
65
66         config TARGET_ROOTFS_TARGZ
67                 bool "tar.gz"
68                 default y if USES_TARGZ
69                 help
70                   Build a compressed tar archive of the the root filesystem
71
72         comment "Root filesystem images"
73
74         config TARGET_ROOTFS_EXT4FS
75                 bool "ext4"
76                 default y if USES_EXT4
77                 depends !TARGET_ROOTFS_INITRAMFS
78                 help
79                   Ext4 file system with some free space for uml images
80
81         config TARGET_ROOTFS_ISO
82                 bool "iso"
83                 default n
84                 depends on TARGET_x86_generic
85                 depends !TARGET_ROOTFS_INITRAMFS
86                 help
87                   Create some bootable ISO image
88
89         config TARGET_ROOTFS_JFFS2
90                 bool "jffs2"
91                 default y if USES_JFFS2
92                 depends !TARGET_ROOTFS_INITRAMFS
93                 help
94                   Build a jffs2 root filesystem
95
96         config TARGET_ROOTFS_SQUASHFS
97                 bool "squashfs"
98                 default y if USES_SQUASHFS
99                 depends !TARGET_ROOTFS_INITRAMFS
100                 help
101                   Build a squashfs-lzma root filesystem
102
103         config TARGET_ROOTFS_UBIFS
104                 bool "ubifs"
105                 default y if USES_UBIFS
106                 depends !TARGET_ROOTFS_INITRAMFS && USES_UBIFS
107                 help
108                   Build a ubifs root filesystem
109
110         comment "Image Options"
111
112         source "target/linux/*/image/Config.in"
113
114         config TARGET_ROOTFS_PARTSIZE
115                 int "Root filesystem partition size (in MB)"
116                 depends X86_GRUB_IMAGES || TARGET_ROOTFS_EXT4FS || TARGET_rb532
117                 default 48
118                 help
119                     Allows you to change the root filesystem partition size
120
121         config TARGET_ROOTFS_MAXINODE
122                 int "Maximum number of inodes in root filesystem"
123                 depends TARGET_ROOTFS_EXT4FS
124                 default 6000
125                 help
126                     Allows you to change the maximum number of inodes in the root filesystem
127
128         config TARGET_ROOTFS_RESERVED_PCT
129                 int "Percentage of reserved blocks in root filesystem"
130                 depends TARGET_ROOTFS_EXT4FS
131                 default 0
132                 help
133                     Allows you to change the percentage of reserved blocks in the root filesystem
134
135 endmenu
136
137 menu "Global build settings"
138
139         config ALL
140                 bool "Select all packages by default"
141                 default n
142
143         comment "General build options"
144
145         config DISPLAY_SUPPORT
146                 bool "Show packages that require graphics support (local or remote)"
147                 default n
148
149         config BUILD_PATENTED
150                 default y
151                 bool "Compile with support for patented functionality"
152                 help
153                   When this option is disabled, software which provides patented functionality will not be built.
154                   In case software provides optional support for patented functionality,
155                   this optional support will get disabled for this package.
156
157         config BUILD_NLS
158                 default n
159                 bool "Compile with full language support"
160                 help
161                   When this option is enabled, packages are built with the full versions of iconv and GNU gettext
162                   instead of the default OpenWrt stubs. If uClibc is used, it is also built with locale support.
163
164         config BUILD_STATIC_TOOLS
165                 default n
166                 bool "Attempt to link host utilities statically"
167                 help
168                   Linking host utilities like sed or firmware-utils statically increases the portability of the
169                   generated ImageBuilder and SDK tarballs, however it may fail on some Linux distributions.
170
171         config SHADOW_PASSWORDS
172                 bool
173                 prompt "Enable shadow password support"
174                 default y
175                 help
176                   Enable shadow password support.
177
178         config CLEAN_IPKG
179                 bool
180                 prompt "Remove ipkg/opkg status data files in final images"
181                 default n
182                 help
183                         This removes all ipkg/opkg status data files from the target directory before building the root fs
184
185         config COLLECT_KERNEL_DEBUG
186                 bool
187                 prompt "Collect kernel debug information"
188                 select KERNEL_DEBUG_INFO
189                 default n
190                 help
191                         This collects debugging symbols from the kernel and all compiled modules.
192                         Useful for release builds, so that kernel issues can be debugged offline later.
193
194         comment "Kernel build options"
195
196         config KERNEL_DEBUG_FS
197                 bool "Compile the kernel with Debug FileSystem enabled"
198                 default y
199                 help
200                   debugfs is a virtual file system that kernel developers use to put
201                   debugging files into. Enable this option to be able to read and
202                   write to these files.
203
204         config KERNEL_PERF_EVENTS
205                 bool
206                 default n
207
208         config KERNEL_PROFILING
209                 bool "Compile the kernel with profiling enabled"
210                 default n
211                 select KERNEL_PERF_EVENTS
212                 help
213                   Enable the extended profiling support mechanisms used by profilers such
214                   as OProfile.
215
216         config KERNEL_KALLSYMS
217                 bool "Compile the kernel with symbol table information"
218                 default n
219                 help
220                   This will give you more information in stack traces from kernel oopses
221
222         config KERNEL_FTRACE
223                 bool "Compile the kernel with tracing support"
224                 default n
225
226         config KERNEL_ENABLE_DEFAULT_TRACERS
227                 bool "Trace process context switches and events"
228                 depends on KERNEL_FTRACE
229                 default n
230
231         config KERNEL_DEBUG_KERNEL
232                 bool
233                 default n
234
235         config KERNEL_DEBUG_INFO
236                 bool "Compile the kernel with debug information"
237                 default n
238                 select KERNEL_DEBUG_KERNEL
239                 help
240                   This will compile your kernel and modules with debug information.
241
242         config KERNEL_DEBUG_LL_UART_NONE
243                 bool
244                 default n
245                 depends on arm
246
247         config KERNEL_DEBUG_LL
248                 bool
249                 default n
250                 depends on arm
251                 select KERNEL_DEBUG_LL_UART_NONE
252                 help
253                   ARM low level debugging
254
255         config KERNEL_EARLY_PRINTK
256                 bool "Compile the kernel with early printk"
257                 default n
258                 depends on arm
259                 select KERNEL_DEBUG_KERNEL
260                 select KERNEL_DEBUG_LL if arm
261                 help
262                   Compile the kernel with early printk support.
263                   This is only useful for debugging purposes to send messages
264                   over the serial console in early boot.
265                   Enable this to debug early boot problems.
266
267         config KERNEL_AIO
268                 bool "Compile the kernel with asynchronous IO support"
269                 default n
270
271         config KERNEL_MAGIC_SYSRQ
272                 bool "Compile the kernel with SysRq support"
273                 default y
274
275         config KERNEL_ELF_CORE
276                 bool "Enable process core dump support"
277                 default y
278
279         config KERNEL_PROVE_LOCKING
280                 bool "Enable kernel lock checking"
281                 select KERNEL_DEBUG_KERNEL
282                 default n
283
284         config KERNEL_PRINTK_TIME
285                 bool "Enable printk timestamps"
286                 default y
287
288         #
289         # CGROUP support symbols
290         #
291
292         config KERNEL_FREEZER
293                 bool
294                 default y if KERNEL_CGROUP_FREEZER
295                 depends KERNEL_CGROUPS
296
297         config KERNEL_CGROUP_FREEZER
298                 bool
299                 depends KERNEL_CGROUPS
300
301         config KERNEL_CGROUP_DEVICE
302                 bool
303                 depends KERNEL_CGROUPS
304
305         config KERNEL_CPUSETS
306                 bool
307                 default y if KERNEL_CGROUP_CPUACCT
308                 depends KERNEL_CGROUPS
309
310         config KERNEL_PROC_PID_CPUSET
311                 bool
312                 default y if KERNEL_CGROUP_CPUACCT
313                 depends KERNEL_CGROUPS
314
315         config KERNEL_CGROUP_CPUACCT
316                 bool
317                 depends KERNEL_CGROUPS
318
319         config KERNEL_RESOURCE_COUNTERS
320                 bool
321                 default y if KERNEL_CGROUP_MEM_RES_CTLR
322                 depends KERNEL_CGROUPS
323
324         config KERNEL_CGROUP_MEM_RES_CTLR
325                 bool
326                 depends KERNEL_CGROUPS
327
328         config KERNEL_CGROUP_MEM_RES_CTLR_SWAP
329                 bool
330                 depends KERNEL_CGROUPS
331
332         config KERNEL_CGROUP_MEM_RES_CTLR_SWAP_ENABLED
333                 bool
334                 depends KERNEL_CGROUPS
335
336         config KERNEL_CGROUP_MEM_RES_CTLR_KMEM
337                 bool
338                 depends KERNEL_CGROUPS
339
340         config KERNEL_CGROUP_PERF
341                 bool
342                 depends KERNEL_CGROUPS
343
344         config KERNEL_CFS_BANDWIDTH
345                 bool
346                 default y if KERNEL_FAIR_GROUP_SCHED
347                 depends KERNEL_CGROUP_SCHED
348
349         config KERNEL_FAIR_GROUP_SCHED
350                 bool
351                 default y if KERNEL_CGROUP_SCHED
352                 depends KERNEL_CGROUP_SCHED
353
354         config KERNEL_RT_GROUP_SCHED
355                 bool
356                 default y if KERNEL_CGROUP_SCHED
357                 depends KERNEL_CGROUP_SCHED
358
359         config KERNEL_CGROUP_SCHED
360                 bool
361                 depends KERNEL_CGROUPS
362
363         config KERNEL_NET_CLS_CGROUP
364                 bool
365                 depends KERNEL_CGROUPS
366
367         config KERNEL_NETPRIO_CGROUP
368                 bool
369                 depends KERNEL_CGROUPS
370
371         config KERNEL_BLK_CGROUP
372                 bool
373                 depends KERNEL_CGROUPS
374
375         config KERNEL_DEBUG_BLK_CGROUP
376                 bool
377                 default n if KERNEL_CGROUPS
378                 depends KERNEL_CGROUPS
379
380         config KERNEL_CGROUPS
381                 bool "Enable kernel cgroups"
382                 default n
383                 select KERNEL_CGROUP_FREEZER
384                 select KERNEL_CGROUP_DEVICE
385                 select KERNEL_CGROUP_CPUACCT
386                 select KERNEL_CGROUP_MEM_RES_CTLR
387                 select KERNEL_CGROUP_MEM_RES_CTLR_SWAP
388                 select KERNEL_CGROUP_MEM_RES_CTLR_SWAP_ENABLED
389                 select KERNEL_CGROUP_MEM_RES_CTLR_KMEM
390                 select KERNEL_CGROUP_PERF
391                 select KERNEL_CGROUP_SCHED
392                 select KERNEL_NET_CLS_CGROUP
393                 select KERNEL_NETPRIO_CGROUP
394                 select KERNEL_BLK_CGROUP
395
396         #
397         # Namespace support symbols
398         #
399
400         config KERNEL_UTS_NS
401                 bool
402                 depends KERNEL_NAMESPACES
403
404         config KERNEL_IPC_NS
405                 bool
406                 depends KERNEL_NAMESPACES
407
408         config KERNEL_USER_NS
409                 bool
410                 depends KERNEL_NAMESPACES
411
412         config KERNEL_PID_NS
413                 bool
414                 depends KERNEL_NAMESPACES
415
416         config KERNEL_NET_NS
417                 bool
418                 depends KERNEL_NAMESPACES
419
420         config KERNEL_DEVPTS_MULTIPLE_INSTANCES
421                 bool
422                 depends KERNEL_NAMESPACES
423
424         config KERNEL_NAMESPACES
425                 bool "Enable kernel namespaces"
426                 default n
427                 select KERNEL_UTS_NS
428                 select KERNEL_IPC_NS
429                 select KERNEL_USER_NS
430                 select KERNEL_PID_NS
431                 select KERNEL_NET_NS
432                 select KERNEL_DEVPTS_MULTIPLE_INSTANCES
433
434
435         comment "Package build options"
436
437         config DEBUG
438                 bool
439                 prompt "Compile packages with debugging info"
440                 default n
441                 help
442                   Adds -g3 to the CFLAGS
443
444         config IPV6
445                 bool
446                 prompt "Enable IPv6 support in packages"
447                 default y
448                 help
449                   Enable IPV6 support in packages (passes --enable-ipv6 to configure scripts).
450
451         config PKG_BUILD_PARALLEL
452                 bool
453                 prompt "Compile certain packages parallelized"
454                 default y
455                 help
456                   This adds a -jX option to certain packages that are known to
457                   behave well for parallel build. By default the package make processes
458                   use the main jobserver, in which case this option only takes effect
459                   when you add -jX to the make command.
460
461                   If you are unsure, select N.
462
463         config PKG_BUILD_USE_JOBSERVER
464                 bool
465                 prompt "Use top-level make jobserver for packages"
466                 depends on PKG_BUILD_PARALLEL
467                 default y
468                 help
469                   This passes the main make process jobserver fds to package builds,
470                   enabling full parallelization across different packages
471
472                   Note that disabling this may overcommit CPU resources depending on the
473                   -j level of the main make process, the number of package
474                   submake jobs selected below and the number of actual CPUs present.
475                   Example: If the main make is passed a -j4 and the submake -j
476                   is also set to 4, we may end up with 16 parallel make processes
477                   in the worst case.
478
479
480         config PKG_BUILD_JOBS
481                 int
482                 prompt "Number of package submake jobs (2-512)"
483                 range 2 512
484                 default 2
485                 depends on PKG_BUILD_PARALLEL && !PKG_BUILD_USE_JOBSERVER
486                 help
487                   The number of jobs (-jX) to pass to packages submake.
488
489         config PKG_DEFAULT_PARALLEL
490                 bool
491                 prompt "Parallelize the default package build rule (May break build)"
492                 depends on PKG_BUILD_PARALLEL
493                 depends on BROKEN
494                 default n
495                 help
496                   Always set the default package build rules to parallel build.
497
498                   WARNING: This may break build or kill your cat, as it builds
499                   packages with multiple jobs that are probably not tested in
500                   a parallel build environment.
501
502                   Only say Y, if you don't mind fixing broken packages.
503                   Before reporting build bugs, set this to N and re-run the build.
504
505         comment "Stripping options"
506
507         choice
508                 prompt "Binary stripping method"
509                 default USE_STRIP   if EXTERNAL_TOOLCHAIN
510                 default USE_STRIP   if USE_GLIBC || USE_EGLIBC
511                 default USE_SSTRIP
512                 help
513                   Select the binary stripping method you wish to use.
514
515                 config NO_STRIP
516                         bool "none"
517                         help
518                           This will install unstripped binaries (useful for native compiling/debugging)
519
520                 config USE_STRIP
521                         bool "strip"
522                         help
523                           This will install binaries stripped using strip from binutils
524
525
526                 config USE_SSTRIP
527                         bool "sstrip"
528                         depends !DEBUG
529                         depends !USE_GLIBC
530                         depends !USE_EGLIBC
531                         depends !USE_MUSL
532                         help
533                           This will install binaries stripped using sstrip
534         endchoice
535
536         config STRIP_ARGS
537                 string
538                 prompt "Strip arguments"
539                 depends USE_STRIP
540                 default "--strip-unneeded --remove-section=.comment --remove-section=.note" if DEBUG
541                 default "--strip-all"
542                 help
543                   Specifies arguments passed to the strip command when stripping binaries
544
545         config STRIP_KERNEL_EXPORTS
546                 bool "Strip unnecessary exports from the kernel image"
547                 depends BROKEN
548                 help
549                   Reduces kernel size by stripping unused kernel exports from the kernel image
550                   Note that this might make the kernel incompatible with any kernel modules that
551                   were not selected at the time the kernel image was created
552
553         config USE_MKLIBS
554                 bool "Strip unnecessary functions from libraries"
555                 help
556                   Reduces libraries to only those functions that are necessary for using all
557                   selected packages (including those selected as <M>)
558                   Note that this will make the system libraries incompatible with most of the packages
559                   that are not selected during the build process
560
561         if INSTALL_LIBSTDCPP
562                 choice
563                         prompt "Preferred standard C++ library"
564                         default USE_LIBSTDCXX if USE_EGLIBC
565                         default USE_UCLIBCXX
566                         help
567                           Select the preferred standard C++ library for all packages that support this.
568
569                         config USE_UCLIBCXX
570                                 bool "uClibc++"
571
572                         config USE_LIBSTDCXX
573                                 bool "libstdc++"
574                 endchoice
575         endif
576
577 endmenu
578
579 menuconfig DEVEL
580         bool "Advanced configuration options (for developers)"
581         default n
582
583         config BROKEN
584                 bool "Show broken platforms / packages" if DEVEL
585                 default n
586
587         config DOWNLOAD_FOLDER
588                 string "Download folder" if DEVEL
589                 default ""
590
591         config LOCALMIRROR
592                 string "Local mirror for source packages" if DEVEL
593                 default ""
594
595         config AUTOREBUILD
596                 bool "Automatic rebuild of packages" if DEVEL
597                 default y
598                 help
599                   Automatically rebuild packages when their files change
600
601         config BUILD_SUFFIX
602                 string "Build suffix to append to the BUILD_DIR variable" if DEVEL
603                 default ""
604                 help
605                   Build suffix to append to the BUILD_DIR variable, i.e: build_dir_suffix
606
607         config TARGET_ROOTFS_DIR
608                 string "Override the default TARGET_ROOTFS_DIR variable" if DEVEL
609                 default ""
610                 help
611                   Override the default TARGET_ROOTFS_DIR variable content $(BUILD_DIR) with custom path.
612                   Use this option to re-define the location of the target root file system directory.
613
614         config CCACHE
615                 bool "Use ccache" if DEVEL
616                 default n
617                 help
618                   Compiler cache; see http://ccache.samba.org/
619
620         config EXTERNAL_KERNEL_TREE
621                 string "Use external kernel tree" if DEVEL
622                 default ""
623
624         config KERNEL_GIT_CLONE_URI
625                 string "Enter git repository to clone" if DEVEL
626                 default ""
627                 help
628                   Enter the full git repository path i.e.:
629                   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
630                   This will create a git clone of the kernel in your build
631                   directory.
632
633         config KERNEL_GIT_LOCAL_REPOSITORY
634                 string "Enter path to local reference repository" if DEVEL
635                 default ""
636                 help
637                   Enter a full pathname to a local reference git repository.
638                   In this instance, the --refererence option of git clone will
639                   be used thus creating a quick local clone of your repo.
640
641         config BUILD_LOG
642                 bool "Enable log files during build process" if DEVEL
643                 help
644                   If enabled log files will be written to the ./log directory
645
646         config SRC_TREE_OVERRIDE
647                 bool "Enable package source tree override" if DEVEL
648                 help
649                   If enabled, you can force a package to use a git tree as source
650                   code instead of the normal tarball. Create a symlink 'git-src'
651                   in the package directory, pointing to the .git tree that you want
652                   to pull the source code from
653
654 menuconfig TARGET_OPTIONS
655         bool "Target Options"  if DEVEL
656
657         config TARGET_OPTIMIZATION
658                 string "Target Optimizations" if TARGET_OPTIONS
659                 default DEFAULT_TARGET_OPTIMIZATION
660                 help
661                   Optimizations to use when building for the target host.
662
663         config SOFT_FLOAT
664                 bool "Use software floating point by default" if TARGET_OPTIONS
665                 default y
666                 depends on (arm || armeb || powerpc || mipsel || mips) && !HAS_FPU
667                 help
668                   If your target CPU does not have a Floating Point Unit (FPU) or a
669                   kernel FPU emulator, but you still wish to support floating point
670                   functions, then everything will need to be compiled with soft floating
671                   point support (-msoft-float).
672
673                   Most people will answer N.
674
675 source "toolchain/Config.in"
676
677 source "target/imagebuilder/Config.in"
678 source "target/sdk/Config.in"
679 source "target/toolchain/Config.in"
680
681 source "tmp/.config-package.in"