#
# For a description of the syntax of this configuration file,
-# see scripts/kbuild/config-language.txt.
+# see docs/Kconfig-language.txt.
#
-mainmenu "BusyBox Configuration"
+mainmenu "Configuration"
config HAVE_DOT_CONFIG
bool
default y
-menu "Busybox Settings"
+menu "Settings"
-menu "General Configuration"
-
-config NITPICK
- bool "See lots more (probably unnecessary) configuration options."
- default n
+config DESKTOP
+ bool "Enable compatibility for full-blown desktop systems (8kb)"
+ default y
help
- Some BusyBox applets have more configuration options than anyone
- will ever care about. To avoid drowining people in complexity, most
- of the applet features that can be set to a sane default value are
- hidden, unless you hit the above switch.
-
- This is better than to telling people to edit the busybox source
- code, but not by much.
+ Enable applet options and features which are not essential.
+ Many applet options have dedicated config options to (de)select them
+ under that applet; this options enables those options which have no
+ individual config item for them.
- See http://en.wikipedia.org/wiki/Fibber_McGee_and_Molly#The_Closet
+ Select this if you plan to use busybox on full-blown desktop machine
+ with common Linux distro, which needs higher level of command-line
+ compatibility.
- You have been warned.
+ If you are preparing your build to be used on an embedded box
+ where you have tighter control over the entire set of userspace
+ tools, you can unselect this option for smaller code size.
-config DESKTOP
- bool "Enable options for full-blown desktop systems"
+config EXTRA_COMPAT
+ bool "Provide compatible behavior for rare corner cases (bigger code)"
default n
help
- Enable options and features which are not essential.
- Select this only if you plan to use busybox on full-blown
- desktop machine with common Linux distro, not on an embedded box.
+ This option makes grep, sed etc handle rare corner cases
+ (embedded NUL bytes and such). This makes code bigger and uses
+ some GNU extensions in libc. You probably only need this option
+ if you plan to run busybox on desktop.
-choice
- prompt "Buffer allocation policy"
- default FEATURE_BUFFERS_USE_MALLOC
- depends on NITPICK
+config FEDORA_COMPAT
+ bool "Building for Fedora distribution"
+ default n
help
- There are 3 ways BusyBox can handle buffer allocations:
- - Use malloc. This costs code size for the call to xmalloc.
- - Put them on stack. For some very small machines with limited stack
- space, this can be deadly. For most folks, this works just fine.
- - Put them in BSS. This works beautifully for computers with a real
- MMU (and OS support), but wastes runtime RAM for uCLinux. This
- behavior was the only one available for BusyBox versions 0.48 and
- earlier.
-
-config FEATURE_BUFFERS_USE_MALLOC
- bool "Allocate with Malloc"
+ This option makes some tools behave like they do on Fedora.
-config FEATURE_BUFFERS_GO_ON_STACK
- bool "Allocate on the Stack"
+ At the time of this writing (2017-08) this only affects uname:
+ normally, uname -p (processor) and uname -i (platform)
+ are shown as "unknown", but with this option uname -p
+ shows the same string as uname -m (machine type),
+ and so does uname -i unless machine type is i486/i586/i686 -
+ then uname -i shows "i386".
-config FEATURE_BUFFERS_GO_IN_BSS
- bool "Allocate in the .bss section"
+config INCLUDE_SUSv2
+ bool "Enable obsolete features removed before SUSv3"
+ default y
+ help
+ This option will enable backwards compatibility with SuSv2,
+ specifically, old-style numeric options ('command -1 <file>')
+ will be supported in head, tail, and fold. (Note: should
+ affect renice too.)
-endchoice
+config LONG_OPTS
+ bool "Support --long-options"
+ default y
+ help
+ Enable this if you want busybox applets to use the gnu --long-option
+ style, in addition to single character -a -b -c style options.
config SHOW_USAGE
- bool "Show terse applet usage messages"
+ bool "Show applet usage messages"
default y
help
- All BusyBox applets will show help messages when invoked with
- wrong arguments. You can turn off printing these terse usage
- messages if you say no here.
- This will save you up to 7k.
+ Enabling this option, applets will show terse help messages
+ when invoked with wrong arguments.
+ If you do not want to show any (helpful) usage message when
+ issuing wrong command syntax, you can say 'N' here,
+ saving approximately 7k.
config FEATURE_VERBOSE_USAGE
bool "Show verbose applet usage messages"
- default n
- select SHOW_USAGE
+ default y
+ depends on SHOW_USAGE
help
- All BusyBox applets will show more verbose help messages when
- busybox is invoked with --help. This will add a lot of text to the
- busybox binary. In the default configuration, this will add about
- 13k, but it can add much more depending on your configuration.
+ All applets will show verbose help messages when invoked with --help.
+ This will add a lot of text to the binary.
config FEATURE_COMPRESS_USAGE
bool "Store applet usage messages in compressed form"
default y
depends on SHOW_USAGE
help
- Store usage messages in compressed form, uncompress them on-the-fly
- when <applet> --help is called.
+ Store usage messages in .bz2 compressed form, uncompress them
+ on-the-fly when "APPLET --help" is run.
- If you have a really tiny busybox with few applets enabled (and
- bunzip2 isn't one of them), the overhead of the decompressor might
- be noticeable. Also, if you run executables directly from ROM
- and have very little memory, this might not be a win. Otherwise,
- you probably want this.
+ If you have a really tiny busybox with few applets enabled (and
+ bunzip2 isn't one of them), the overhead of the decompressor might
+ be noticeable. Also, if you run executables directly from ROM
+ and have very little memory, this might not be a win. Otherwise,
+ you probably want this.
-config FEATURE_INSTALLER
- bool "Support --install [-s] to install applet links at runtime"
- default n
+config LFS
+ bool "Support files > 2 GB"
+ default y
help
- Enable 'busybox --install [-s]' support. This will allow you to use
- busybox at runtime to create hard links or symlinks for all the
- applets that are compiled into busybox.
+ If you need to work with large files, enable this option.
+ This will have no effect if your kernel or your C
+ library lacks large file support for large files. Some of the
+ programs that can benefit from large file support include dd, gzip,
+ cp, mount, tar.
-config LOCALE_SUPPORT
- bool "Enable locale support (system needs locale for this to work)"
+config PAM
+ bool "Support PAM (Pluggable Authentication Modules)"
default n
help
- Enable this if your system has locale support and you would like
- busybox to support locale settings.
-
-config GETOPT_LONG
- bool "Enable support for --long-options"
- default y
- help
- Enable this if you want busybox applets to use the gnu --long-option
- style, in addition to single character -a -b -c style options.
+ Use PAM in some applets (currently login and httpd) instead
+ of direct access to password database.
config FEATURE_DEVPTS
bool "Use the devpts filesystem for Unix98 PTYs"
default y
help
- Enable if you want BusyBox to use Unix98 PTY support. If enabled,
- busybox will use /dev/ptmx for the master side of the pseudoterminal
- and /dev/pts/<number> for the slave side. Otherwise, BSD style
- /dev/ttyp<number> will be used. To use this option, you should have
- devpts mounted.
+ Enable if you want to use Unix98 PTY support. If enabled,
+ busybox will use /dev/ptmx for the master side of the pseudoterminal
+ and /dev/pts/<number> for the slave side. Otherwise, BSD style
+ /dev/ttyp<number> will be used. To use this option, you should have
+ devpts mounted.
-config FEATURE_CLEAN_UP
- bool "Clean up all memory before exiting (usually not needed)"
- default n
- depends on NITPICK
+config FEATURE_UTMP
+ bool "Support utmp file"
+ default y
help
- As a size optimization, busybox normally exits without explicitly
- freeing dynamically allocated memory or closing files. This saves
- space since the OS will clean up for us, but it can confuse debuggers
- like valgrind, which report tons of memory and resource leaks.
+ The file /var/run/utmp is used to track who is currently logged in.
+ With this option on, certain applets (getty, login, telnetd etc)
+ will create and delete entries there.
+ "who" applet requires this option.
- Don't enable this unless you have a really good reason to clean
- things up manually.
+config FEATURE_WTMP
+ bool "Support wtmp file"
+ default y
+ depends on FEATURE_UTMP
+ help
+ The file /var/run/wtmp is used to track when users have logged into
+ and logged out of the system.
+ With this option on, certain applets (getty, login, telnetd etc)
+ will append new entries there.
+ "last" applet requires this option.
config FEATURE_PIDFILE
bool "Support writing pidfiles"
- default n
+ default y
help
- This option makes some applets (e.g. crond, syslogd, inetd) write
- a pidfile in /var/run. Some applications rely on them.
+ This option makes some applets (e.g. crond, syslogd, inetd) write
+ a pidfile at the configured PID_FILE_PATH. It has no effect
+ on applets which require pidfiles to run.
-config FEATURE_SUID
- bool "Support for SUID/SGID handling"
- default n
+config PID_FILE_PATH
+ string "Directory for pidfiles"
+ default "/var/run"
+ depends on FEATURE_PIDFILE || FEATURE_CROND_SPECIAL_TIMES
help
- With this option you can install the busybox binary belonging
- to root with the suid bit set, and it'll and it'll automatically drop
- priviledges for applets that don't need root access.
+ This is the default path where pidfiles are created. Applets which
+ allow you to set the pidfile path on the command line will override
+ this value. The option has no effect on applets that require you to
+ specify a pidfile path. When crond has the 'Support special times'
+ option enabled, the 'crond.reboot' file is also stored here.
- If you're really paranoid and don't want to do this, build two
- busybox binaries with different applets in them (and the appropriate
- symlinks pointing to each binary), and only set the suid bit on the
- one that needs it. The applets currently marked to need the suid bit
- are login, passwd, su, ping, traceroute, crontab, dnsd, ipcrm, ipcs,
- and vlock.
+config BUSYBOX
+ bool "Include busybox applet"
+ default y
+ help
+ The busybox applet provides general help message and allows
+ the included applets to be listed. It also provides
+ optional --install command to create applet links. If you unselect
+ this option, running busybox without any arguments will give
+ just a cryptic error message:
-config FEATURE_SUID_CONFIG
- bool "Runtime SUID/SGID configuration via /etc/busybox.conf"
- default n if FEATURE_SUID
- depends on FEATURE_SUID
+ $ busybox
+ busybox: applet not found
+
+ Running "busybox APPLET [ARGS...]" will still work, of course.
+
+config FEATURE_SHOW_SCRIPT
+ bool "Support --show SCRIPT"
+ default y
+ depends on BUSYBOX
+
+config FEATURE_INSTALLER
+ bool "Support --install [-s] to install applet links at runtime"
+ default y
+ depends on BUSYBOX
help
- Allow the SUID / SGID state of an applet to be determined at runtime
- by checking /etc/busybox.conf. (This is sort of a poor man's sudo.)
- The format of this file is as follows:
+ Enable 'busybox --install [-s]' support. This will allow you to use
+ busybox at runtime to create hard links or symlinks for all the
+ applets that are compiled into busybox.
- <applet> = [Ssx-][Ssx-][x-] (<username>|<uid>).(<groupname>|<gid>)
+config INSTALL_NO_USR
+ bool "Don't use /usr"
+ default n
+ help
+ Disable use of /usr. "busybox --install" and "make install"
+ will install applets only to /bin and /sbin,
+ never to /usr/bin or /usr/sbin.
- An example might help:
+config FEATURE_SUID
+ bool "Drop SUID state for most applets"
+ default y
+ help
+ With this option you can install the busybox binary belonging
+ to root with the suid bit set, enabling some applets to perform
+ root-level operations even when run by ordinary users
+ (for example, mounting of user mounts in fstab needs this).
- [SUID]
- su = ssx root.0 # applet su can be run by anyone and runs with euid=0/egid=0
- su = ssx # exactly the same
+ With this option enabled, busybox drops privileges for applets
+ that don't need root access, before entering their main() function.
- mount = sx- root.disk # applet mount can be run by root and members of group disk
- # and runs with euid=0
+ If you are really paranoid and don't want even initial busybox code
+ to run under root for every applet, build two busybox binaries with
+ different applets in them (and the appropriate symlinks pointing
+ to each binary), and only set the suid bit on the one that needs it.
- cp = --- # disable applet cp for everyone
+ Some applets which require root rights (need suid bit on the binary
+ or to be run by root) and will refuse to execute otherwise:
+ crontab, login, passwd, su, vlock, wall.
- The file has to be owned by user root, group root and has to be
- writeable only by root:
- (chown 0.0 /etc/busybox.conf; chmod 600 /etc/busybox.conf)
- The busybox executable has to be owned by user root, group
- root and has to be setuid root for this to work:
- (chown 0.0 /bin/busybox; chmod 4755 /bin/busybox)
+ The applets which will use root rights if they have them
+ (via suid bit, or because run by root), but would try to work
+ without root right nevertheless:
+ findfs, ping[6], traceroute[6], mount.
- Robert 'sandman' Griebl has more information here:
- <url: http://www.softforge.de/bb/suid.html >.
+ Note that if you DO NOT select this option, but DO make busybox
+ suid root, ALL applets will run under root, which is a huge
+ security hole (think "cp /some/file /etc/passwd").
+
+config FEATURE_SUID_CONFIG
+ bool "Enable SUID configuration via /etc/busybox.conf"
+ default y
+ depends on FEATURE_SUID
+ help
+ Allow the SUID/SGID state of an applet to be determined at runtime
+ by checking /etc/busybox.conf. (This is sort of a poor man's sudo.)
+ The format of this file is as follows:
+
+ APPLET = [Ssx-][Ssx-][x-] [USER.GROUP]
+
+ s: USER or GROUP is allowed to execute APPLET.
+ APPLET will run under USER or GROUP
+ (regardless of who's running it).
+ S: USER or GROUP is NOT allowed to execute APPLET.
+ APPLET will run under USER or GROUP.
+ This option is not very sensical.
+ x: USER/GROUP/others are allowed to execute APPLET.
+ No UID/GID change will be done when it is run.
+ -: USER/GROUP/others are not allowed to execute APPLET.
+
+ An example might help:
+
+ |[SUID]
+ |su = ssx root.0 # applet su can be run by anyone and runs with
+ | # euid=0,egid=0
+ |su = ssx # exactly the same
+ |
+ |mount = sx- root.disk # applet mount can be run by root and members
+ | # of group disk (but not anyone else)
+ | # and runs with euid=0 (egid is not changed)
+ |
+ |cp = --- # disable applet cp for everyone
+
+ The file has to be owned by user root, group root and has to be
+ writeable only by root:
+ (chown 0.0 /etc/busybox.conf; chmod 600 /etc/busybox.conf)
+ The busybox executable has to be owned by user root, group
+ root and has to be setuid root for this to work:
+ (chown 0.0 /bin/busybox; chmod 4755 /bin/busybox)
+
+ Robert 'sandman' Griebl has more information here:
+ <url: http://www.softforge.de/bb/suid.html >.
config FEATURE_SUID_CONFIG_QUIET
bool "Suppress warning message if /etc/busybox.conf is not readable"
default y
depends on FEATURE_SUID_CONFIG
help
- /etc/busybox.conf should be readable by the user needing the SUID, check
- this option to avoid users to be notified about missing permissions.
+ /etc/busybox.conf should be readable by the user needing the SUID,
+ check this option to avoid users to be notified about missing
+ permissions.
+
+config FEATURE_PREFER_APPLETS
+ bool "exec prefers applets"
+ default n
+ help
+ This is an experimental option which directs applets about to
+ call 'exec' to try and find an applicable busybox applet before
+ searching the PATH. This is typically done by exec'ing
+ /proc/self/exe.
+
+ This may affect shell, find -exec, xargs and similar applets.
+ They will use applets even if /bin/APPLET -> busybox link
+ is missing (or is not a link to busybox). However, this causes
+ problems in chroot jails without mounted /proc and with ps/top
+ (command name can be shown as 'exe' for applets started this way).
+
+config BUSYBOX_EXEC_PATH
+ string "Path to busybox executable"
+ default "/proc/self/exe"
+ help
+ When applets need to run other applets, busybox
+ sometimes needs to exec() itself. When the /proc filesystem is
+ mounted, /proc/self/exe always points to the currently running
+ executable. If you haven't got /proc, set this to wherever you
+ want to run busybox from.
config SELINUX
bool "Support NSA Security Enhanced Linux"
default n
+ select PLATFORM_LINUX
help
- Enable support for SELinux in applets ls, ps, and id. Also provide
- the option of compiling in SELinux applets.
+ Enable support for SELinux in applets ls, ps, and id. Also provide
+ the option of compiling in SELinux applets.
+
+ If you do not have a complete SELinux userland installed, this stuff
+ will not compile. Specifially, libselinux 1.28 or better is
+ directly required by busybox. If the installation is located in a
+ non-standard directory, provide it by invoking make as follows:
- If you do not have a complete SELinux userland installed, this stuff
- will not compile. Go visit
- http://www.nsa.gov/selinux/index.html
- to download the necessary stuff to allow busybox to compile with
- this option enabled. Specifially, libselinux 1.28 or better is
- directly required by busybox. If the installation is located in a
- non-standard directory, provide it by invoking make as follows:
CFLAGS=-I<libselinux-include-path> \
LDFLAGS=-L<libselinux-lib-path> \
make
- Most people will leave this set to 'N'.
+ Most people will leave this set to 'N'.
-config FEATURE_PREFER_APPLETS
- bool "exec prefers applets"
+config FEATURE_CLEAN_UP
+ bool "Clean up all memory before exiting (usually not needed)"
default n
help
- This is an experimental option which directs applets about to
- call 'exec' to try and find an applicable busybox applet before
- searching the PATH. This is typically done by exec'ing
- /proc/self/exe.
- This may affect shell, find -exec, xargs and similar applets.
- They will use applets even if /bin/<applet> -> busybox link
- is missing (or is not a link to busybox). However, this causes
- problems in chroot jails without mounted /proc and with ps/top
- (command name can be shown as 'exe' for applets started this way).
+ As a size optimization, busybox normally exits without explicitly
+ freeing dynamically allocated memory or closing files. This saves
+ space since the OS will clean up for us, but it can confuse debuggers
+ like valgrind, which report tons of memory and resource leaks.
-config BUSYBOX_EXEC_PATH
- string "Path to BusyBox executable"
- default "/proc/self/exe"
+ Don't enable this unless you have a really good reason to clean
+ things up manually.
+
+config FEATURE_SYSLOG_INFO
+ bool "Support LOG_INFO level syslog messages"
+ default y
+ depends on FEATURE_SYSLOG
help
- When Busybox applets need to run other busybox applets, BusyBox
- sometimes needs to exec() itself. When the /proc filesystem is
- mounted, /proc/self/exe always points to the currently running
- executable. If you haven't got /proc, set this to wherever you
- want to run BusyBox from.
+ Applets which send their output to syslog use either LOG_INFO or
+ LOG_ERR log levels, but by disabling this option all messages will
+ be logged at the LOG_ERR level, saving just under 200 bytes.
# These are auto-selected by other options
config FEATURE_SYSLOG
- bool "Support for logging to syslog"
+ bool #No description makes it a hidden option
default n
- help
- This option is auto-selected when you select any applet which may
- send its output to syslog. You do not need to select it manually.
+ #help
+ #This option is auto-selected when you select any applet which may
+ #send its output to syslog. You do not need to select it manually.
+
+config PLATFORM_LINUX
+ bool #No description makes it a hidden option
+ default n
+ #help
+ #For the most part, busybox requires only POSIX compatibility
+ #from the target system, but some applets and features use
+ #Linux-specific interfaces.
+ #
+ #This is automatically selected if any applet or feature requires
+ #Linux-specific interfaces. You do not need to select it manually.
-config FEATURE_HAVE_RPC
- bool "RPC support"
+comment 'Build Options'
+
+config STATIC
+ bool "Build static binary (no shared libs)"
default n
help
- This is automatically selected if any of enabled applets need it.
- You do not need to select it manually.
+ If you want to build a static binary, which does not use
+ or require any shared libraries, enable this option.
+ Static binaries are larger, but do not require functioning
+ dynamic libraries to be present, which is important if used
+ as a system rescue tool.
-endmenu
+config PIE
+ bool "Build position independent executable"
+ default n
+ depends on !STATIC
+ help
+ Hardened code option. PIE binaries are loaded at a different
+ address at each invocation. This has some overhead,
+ particularly on x86-32 which is short on registers.
-menu 'Build Options'
+ Most people will leave this set to 'N'.
-config STATIC
- bool "Build BusyBox as a static binary (no shared libs)"
+config NOMMU
+ bool "Force NOMMU build"
default n
help
- If you want to build a static BusyBox binary, which does not
- use or require any shared libraries, then enable this option.
- This can cause BusyBox to be considerably larger, so you should
- leave this option false unless you have a good reason (i.e.
- your target platform does not support shared libraries, or
- you are building an initrd which doesn't need anything but
- BusyBox, etc).
+ Busybox tries to detect whether architecture it is being
+ built against supports MMU or not. If this detection fails,
+ or if you want to build NOMMU version of busybox for testing,
+ you may force NOMMU build here.
- Most people will leave this set to 'N'.
+ Most people will leave this set to 'N'.
+# PIE can be made to work with BUILD_LIBBUSYBOX, but currently
+# build system does not support that
config BUILD_LIBBUSYBOX
bool "Build shared libbusybox"
default n
+ depends on !FEATURE_PREFER_APPLETS && !PIE && !STATIC
help
- Build a shared library libbusybox.so which contains all
- libraries used inside busybox.
+ Build a shared library libbusybox.so.N.N.N which contains all
+ busybox code.
- This is an experimental feature intended to support the upcoming
- "make standalone" mode. Enabling it against the one big busybox
- binary serves no purpose (and increases the size). You should
- almost certainly say "no" to this right now.
+ This feature allows every applet to be built as a really tiny
+ separate executable linked against the library:
+ |$ size 0_lib/l*
+ | text data bss dec hex filename
+ | 939 212 28 1179 49b 0_lib/last
+ | 939 212 28 1179 49b 0_lib/less
+ | 919138 8328 1556 929022 e2cfe 0_lib/libbusybox.so.1.N.M
-### config FEATURE_FULL_LIBBUSYBOX
-### bool "Feature-complete libbusybox"
-### default n if !FEATURE_SHARED_BUSYBOX
-### depends on BUILD_LIBBUSYBOX
-### help
-### Build a libbusybox with the complete feature-set, disregarding
-### the actually selected config.
-###
-### Normally, libbusybox will only contain the features which are
-### used by busybox itself. If you plan to write a separate
-### standalone application which uses libbusybox say 'Y'.
-###
-### Note: libbusybox is GPL, not LGPL, and exports no stable API that
-### might act as a copyright barrier. We can and will modify the
-### exported function set between releases (even minor version number
-### changes), and happily break out-of-tree features.
-###
-### Say 'N' if in doubt.
+ This is useful on NOMMU systems which are not capable
+ of sharing executables, but are capable of sharing code
+ in dynamic libraries.
+
+config FEATURE_LIBBUSYBOX_STATIC
+ bool "Pull in all external references into libbusybox"
+ default n
+ depends on BUILD_LIBBUSYBOX
+ help
+ Make libbusybox library independent, not using or requiring
+ any other shared libraries.
config FEATURE_INDIVIDUAL
bool "Produce a binary for each applet, linked against libbusybox"
default y
- depends on !STATIC && BUILD_LIBBUSYBOX
+ depends on BUILD_LIBBUSYBOX
help
- If your CPU architecture doesn't allow for sharing text/rodata
- sections of running binaries, but allows for runtime dynamic
- libraries, this option will allow you to reduce memory footprint
- when you have many different applets running at once.
+ If your CPU architecture doesn't allow for sharing text/rodata
+ sections of running binaries, but allows for runtime dynamic
+ libraries, this option will allow you to reduce memory footprint
+ when you have many different applets running at once.
- If your CPU architecture allows for sharing text/rodata,
- having single binary is more optimal.
+ If your CPU architecture allows for sharing text/rodata,
+ having single binary is more optimal.
- Each applet will be a tiny program, dynamically linked
- against libbusybox.so.N.N.N.
+ Each applet will be a tiny program, dynamically linked
+ against libbusybox.so.N.N.N.
- You need to have a working dynamic linker.
+ You need to have a working dynamic linker.
config FEATURE_SHARED_BUSYBOX
bool "Produce additional busybox binary linked against libbusybox"
default y
- depends on !STATIC && BUILD_LIBBUSYBOX
+ depends on BUILD_LIBBUSYBOX
help
- Build busybox, dynamically linked against libbusybox.so.N.N.N.
+ Build busybox, dynamically linked against libbusybox.so.N.N.N.
- You need to have a working dynamic linker.
+ You need to have a working dynamic linker.
### config BUILD_AT_ONCE
### bool "Compile all sources at once"
### default n
### help
-### Normally each source-file is compiled with one invocation of
-### the compiler.
-### If you set this option, all sources are compiled at once.
-### This gives the compiler more opportunities to optimize which can
-### result in smaller and/or faster binaries.
+### Normally each source-file is compiled with one invocation of
+### the compiler.
+### If you set this option, all sources are compiled at once.
+### This gives the compiler more opportunities to optimize which can
+### result in smaller and/or faster binaries.
###
-### Setting this option will consume alot of memory, e.g. if you
-### enable all applets with all features, gcc uses more than 300MB
-### RAM during compilation of busybox.
+### Setting this option will consume alot of memory, e.g. if you
+### enable all applets with all features, gcc uses more than 300MB
+### RAM during compilation of busybox.
###
-### This option is most likely only beneficial for newer compilers
-### such as gcc-4.1 and above.
+### This option is most likely only beneficial for newer compilers
+### such as gcc-4.1 and above.
###
-### Say 'N' unless you know what you are doing.
+### Say 'N' unless you know what you are doing.
-config LFS
- bool "Build with Large File Support (for accessing files > 2 GB)"
- default n
- select FDISK_SUPPORT_LARGE_DISKS
+config CROSS_COMPILER_PREFIX
+ string "Cross compiler prefix"
+ default ""
help
- If you want to build BusyBox with large file support, then enable
- this option. This will have no effect if your kernel or your C
- library lacks large file support for large files. Some of the
- programs that can benefit from large file support include dd, gzip,
- cp, mount, tar, and many others. If you want to access files larger
- than 2 Gigabytes, enable this option. Otherwise, leave it set to 'N'.
+ If you want to build busybox with a cross compiler, then you
+ will need to set this to the cross-compiler prefix, for example,
+ "i386-uclibc-".
-endmenu
+ Note that CROSS_COMPILE environment variable or
+ "make CROSS_COMPILE=xxx ..." will override this selection.
-menu 'Debugging Options'
+ Native builds leave this empty.
-config DEBUG
- bool "Build BusyBox with extra Debugging symbols"
- default n
+config SYSROOT
+ string "Path to sysroot"
+ default ""
help
- Say Y here if you wish to examine BusyBox internals while applets are
- running. This increases the size of the binary considerably, and
- should only be used when doing development. If you are doing
- development and want to debug BusyBox, answer Y.
+ If you want to build busybox with a cross compiler, then you
+ might also need to specify where /usr/include and /usr/lib
+ will be found.
- Most people should answer N.
+ For example, busybox can be built against an installed
+ Android NDK, platform version 9, for ARM ABI with
-config WERROR
- bool "Abort compilation on any warning"
- default n
- help
- Selecting this will add -Werror to gcc command line.
-
- Most people should answer N.
+ CONFIG_SYSROOT=/opt/android-ndk/platforms/android-9/arch-arm
-# Seems to be unused
-#config DEBUG_PESSIMIZE
-# bool "Disable compiler optimizations."
-# default n
-# depends on DEBUG
-# help
-# The compiler's optimization of source code can eliminate and reorder
-# code, resulting in an executable that's hard to understand when
-# stepping through it with a debugger. This switches it off, resulting
-# in a much bigger executable that more closely matches the source
-# code.
+ Native builds leave this empty.
-choice
- prompt "Additional debugging library"
- default NO_DEBUG_LIB
+config EXTRA_CFLAGS
+ string "Additional CFLAGS"
+ default ""
help
- Using an additional debugging library will make BusyBox become
- considerable larger and will cause it to run more slowly. You
- should always leave this option disabled for production use.
-
- dmalloc support:
- ----------------
- This enables compiling with dmalloc ( http://dmalloc.com/ )
- which is an excellent public domain mem leak and malloc problem
- detector. To enable dmalloc, before running busybox you will
- want to properly set your environment, for example:
- export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile
- The 'debug=' value is generated using the following command
- dmalloc -p log-stats -p log-non-free -p log-bad-space -p log-elapsed-time \
- -p check-fence -p check-heap -p check-lists -p check-blank \
- -p check-funcs -p realloc-copy -p allow-free-null
-
- Electric-fence support:
- -----------------------
- This enables compiling with Electric-fence support. Electric
- fence is another very useful malloc debugging library which uses
- your computer's virtual memory hardware to detect illegal memory
- accesses. This support will make BusyBox be considerable larger
- and run slower, so you should leave this option disabled unless
- you are hunting a hard to find memory problem.
+ Additional CFLAGS to pass to the compiler verbatim.
+config EXTRA_LDFLAGS
+ string "Additional LDFLAGS"
+ default ""
+ help
+ Additional LDFLAGS to pass to the linker verbatim.
-config NO_DEBUG_LIB
- bool "None"
-
-config DMALLOC
- bool "Dmalloc"
-
-config EFENCE
- bool "Electric-fence"
+config EXTRA_LDLIBS
+ string "Additional LDLIBS"
+ default ""
+ help
+ Additional LDLIBS to pass to the linker with -l.
-endchoice
+config USE_PORTABLE_CODE
+ bool "Avoid using GCC-specific code constructs"
+ default n
+ help
+ Use this option if you are trying to compile busybox with
+ compiler other than gcc.
+ If you do use gcc, this option may needlessly increase code size.
-config INCLUDE_SUSv2
- bool "Enable obsolete features removed before SUSv3?"
+config STACK_OPTIMIZATION_386
+ bool "Use -mpreferred-stack-boundary=2 on i386 arch"
default y
help
- This option will enable backwards compatibility with SuSv2,
- specifically, old-style numeric options ('command -1 <file>')
- will be supported in head, tail, and fold. (Note: should
- affect renice too.)
-
-endmenu
+ This option makes for smaller code, but some libc versions
+ do not work with it (they use SSE instructions without
+ ensuring stack alignment).
-menu 'Installation Options'
-
-config INSTALL_NO_USR
- bool "Don't use /usr"
- default n
- help
- Disable use of /usr. Don't activate this option if you don't know
- that you really want this behaviour.
+comment 'Installation Options ("make install" behavior)'
choice
- prompt "Applets links"
+ prompt "What kind of applet links to install"
default INSTALL_APPLET_SYMLINKS
help
- Choose how you install applets links.
+ Choose what kind of links to applets are created by "make install".
config INSTALL_APPLET_SYMLINKS
bool "as soft-links"
help
- Install applets as soft-links to the busybox binary. This needs some
- free inodes on the filesystem, but might help with filesystem
- generators that can't cope with hard-links.
+ Install applets as soft-links to the busybox binary. This needs some
+ free inodes on the filesystem, but might help with filesystem
+ generators that can't cope with hard-links.
config INSTALL_APPLET_HARDLINKS
bool "as hard-links"
help
- Install applets as hard-links to the busybox binary. This might count
- on a filesystem with few inodes.
+ Install applets as hard-links to the busybox binary. This might
+ count on a filesystem with few inodes.
config INSTALL_APPLET_SCRIPT_WRAPPERS
bool "as script wrappers"
help
- Install applets as script wrappers that call the busybox binary.
+ Install applets as script wrappers that call the busybox binary.
config INSTALL_APPLET_DONT
bool "not installed"
- depends on FEATURE_INSTALLER || FEATURE_SH_STANDALONE || FEATURE_PREFER_APPLETS
help
- Do not install applet links. Useful when using the -install feature
- or a standalone shell for rescue purposes.
+ Do not install applet links. Useful when you plan to use
+ busybox --install for installing links, or plan to use
+ a standalone shell and thus don't need applet links.
endchoice
default INSTALL_SH_APPLET_SYMLINK
depends on INSTALL_APPLET_SCRIPT_WRAPPERS
help
- Choose how you install /bin/sh applet link.
+ Choose how you install /bin/sh applet link.
config INSTALL_SH_APPLET_SYMLINK
bool "as soft-link"
help
- Install /bin/sh applet as soft-link to the busybox binary.
+ Install /bin/sh applet as soft-link to the busybox binary.
config INSTALL_SH_APPLET_HARDLINK
bool "as hard-link"
help
- Install /bin/sh applet as hard-link to the busybox binary.
+ Install /bin/sh applet as hard-link to the busybox binary.
config INSTALL_SH_APPLET_SCRIPT_WRAPPER
bool "as script wrapper"
help
- Install /bin/sh applet as script wrapper that call the busybox binary.
+ Install /bin/sh applet as script wrapper that calls
+ the busybox binary.
endchoice
config PREFIX
- string "BusyBox installation prefix"
+ string "Destination path for 'make install'"
default "./_install"
help
- Define your directory to install BusyBox files/subdirs in.
+ Where "make install" should install busybox binary and links.
-endmenu
+comment 'Debugging Options'
+
+config DEBUG
+ bool "Build with debug information"
+ default n
+ help
+ Say Y here to compile with debug information.
+ This increases the size of the binary considerably, and
+ should only be used when doing development.
+
+ This adds -g option to gcc command line.
+
+ Most people should answer N.
+
+config DEBUG_PESSIMIZE
+ bool "Disable compiler optimizations"
+ default n
+ depends on DEBUG
+ help
+ The compiler's optimization of source code can eliminate and reorder
+ code, resulting in an executable that's hard to understand when
+ stepping through it with a debugger. This switches it off, resulting
+ in a much bigger executable that more closely matches the source
+ code.
+
+ This replaces -Os/-O2 with -O0 in gcc command line.
+
+config DEBUG_SANITIZE
+ bool "Enable runtime sanitizers (ASAN/LSAN/USAN/etc...)"
+ default n
+ help
+ Say Y here if you want to enable runtime sanitizers. These help
+ catch bad memory accesses (e.g. buffer overflows), but will make
+ the executable larger and slow down runtime a bit.
+
+ This adds -fsanitize=foo options to gcc command line.
+
+ If you aren't developing/testing busybox, say N here.
+
+config UNIT_TEST
+ bool "Build unit tests"
+ default n
+ help
+ Say Y here if you want to build unit tests (both the framework and
+ test cases) as an applet. This results in bigger code, so you
+ probably don't want this option in production builds.
+
+config WERROR
+ bool "Abort compilation on any warning"
+ default n
+ help
+ This adds -Werror to gcc command line.
+
+ Most people should answer N.
+
+config WARN_SIMPLE_MSG
+ bool "Warn about single parameter bb_xx_msg calls"
+ default n
+ help
+ This will cause warnings to be shown for any instances of
+ bb_error_msg(), bb_error_msg_and_die(), bb_perror_msg(),
+ bb_perror_msg_and_die(), bb_herror_msg() or bb_herror_msg_and_die()
+ being called with a single parameter. In these cases the equivalent
+ bb_simple_xx_msg function should be used instead.
+ Note that use of STRERROR_FMT may give false positives.
+
+ If you aren't developing busybox, say N here.
+
+choice
+ prompt "Additional debugging library"
+ default NO_DEBUG_LIB
+ help
+ Using an additional debugging library will make busybox become
+ considerably larger and will cause it to run more slowly. You
+ should always leave this option disabled for production use.
+
+ dmalloc support:
+ ----------------
+ This enables compiling with dmalloc ( http://dmalloc.com/ )
+ which is an excellent public domain mem leak and malloc problem
+ detector. To enable dmalloc, before running busybox you will
+ want to properly set your environment, for example:
+ export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile
+ The 'debug=' value is generated using the following command
+ dmalloc -p log-stats -p log-non-free -p log-bad-space \
+ -p log-elapsed-time -p check-fence -p check-heap \
+ -p check-lists -p check-blank -p check-funcs -p realloc-copy \
+ -p allow-free-null
+
+ Electric-fence support:
+ -----------------------
+ This enables compiling with Electric-fence support. Electric
+ fence is another very useful malloc debugging library which uses
+ your computer's virtual memory hardware to detect illegal memory
+ accesses. This support will make busybox be considerably larger
+ and run slower, so you should leave this option disabled unless
+ you are hunting a hard to find memory problem.
+
+
+config NO_DEBUG_LIB
+ bool "None"
+
+config DMALLOC
+ bool "Dmalloc"
+
+config EFENCE
+ bool "Electric-fence"
+
+endchoice
source libbb/Config.in
source coreutils/Config.in
source console-tools/Config.in
source debianutils/Config.in
+source klibc-utils/Config.in
source editors/Config.in
source findutils/Config.in
source init/Config.in
source util-linux/Config.in
source miscutils/Config.in
source networking/Config.in
+source printutils/Config.in
+source mailutils/Config.in
source procps/Config.in
-source shell/Config.in
-source sysklogd/Config.in
source runit/Config.in
source selinux/Config.in
-source ipsvd/Config.in
+source shell/Config.in
+source sysklogd/Config.in
projects / oweals / busybox.git / blobdiff