summaryrefslogtreecommitdiff
path: root/extra/Configs/Config.in
blob: 3315c7d5a655fb9ea56812aa03056e89ef8c5114 (plain)
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#
# For a description of the syntax of this configuration file,
# see extra/config/Kconfig-language.txt
#

mainmenu "uClibc-ng $VERSION C Library Configuration"

config DESIRED_TARGET_ARCH
	string
	option env="ARCH"

config VERSION
	string
	option env="VERSION"

choice
	prompt "Target Architecture"
	default TARGET_alpha if DESIRED_TARGET_ARCH = "alpha"
	default TARGET_arc if DESIRED_TARGET_ARCH = "arc"
	default TARGET_arm if DESIRED_TARGET_ARCH = "arm"
	default TARGET_avr32 if DESIRED_TARGET_ARCH = "avr32"
	default TARGET_bfin if DESIRED_TARGET_ARCH = "bfin"
	default TARGET_cris if DESIRED_TARGET_ARCH = "cris"
	default TARGET_frv if DESIRED_TARGET_ARCH = "frv"
	default TARGET_h8300 if DESIRED_TARGET_ARCH = "h8300"
	default TARGET_hppa if DESIRED_TARGET_ARCH = "hppa"
	default TARGET_i386 if DESIRED_TARGET_ARCH = "i386"
	default TARGET_ia64 if DESIRED_TARGET_ARCH = "ia64"
	default TARGET_lm32 if DESIRED_TARGET_ARCH = "lm32"
	default TARGET_m68k if DESIRED_TARGET_ARCH = "m68k"
	default TARGET_metag if DESIRED_TARGET_ARCH = "metag"
	default TARGET_microblaze if DESIRED_TARGET_ARCH = "microblaze"
	default TARGET_mips if DESIRED_TARGET_ARCH = "mips"
	default TARGET_nds32 if DESIRED_TARGET_ARCH = "nds32"
	default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
	default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
	default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
	default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
	default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
	default TARGET_x86_64 if DESIRED_TARGET_ARCH = "x86_64"
	default TARGET_xtensa if DESIRED_TARGET_ARCH = "xtensa"
	help
	  The architecture of your target.

config TARGET_alpha
	bool "alpha"

config TARGET_arc
	bool "arc"

config TARGET_arm
	bool "arm"

config TARGET_avr32
	bool "avr32"

config TARGET_bfin
	bool "bfin"

# someone could sync this tree:
# http://linux-c6x.org/git/?p=uClibc.git;a=summary
config TARGET_c6x
	bool "c6x"

config TARGET_cris
	bool "cris"

config TARGET_frv
	bool "frv"

config TARGET_h8300
	bool "h8300"

config TARGET_hppa
	bool "hppa"

config TARGET_i386
	bool "i386"

config TARGET_ia64
	bool "ia64"

config TARGET_lm32
	bool "lm32"

config TARGET_m68k
	bool "m68k"

config TARGET_metag
	bool "metag"

config TARGET_microblaze
	bool "microblaze"

config TARGET_mips
	bool "mips"

config TARGET_nds32
	bool "nds32"

config TARGET_nios2
	bool "nios2"

config TARGET_or1k
	bool "or1k"

config TARGET_powerpc
	bool "powerpc"

config TARGET_sh
	bool "superh"

config TARGET_sparc
	bool "sparc"

config TARGET_x86_64
	bool "x86_64"

config TARGET_xtensa
	bool "xtensa"

endchoice


menu "Target Architecture Features and Options"

if TARGET_alpha
source "extra/Configs/Config.alpha"
endif

if TARGET_arm
source "extra/Configs/Config.arm"
endif

if TARGET_avr32
source "extra/Configs/Config.avr32"
endif

if TARGET_bfin
source "extra/Configs/Config.bfin"
endif

if TARGET_cris
source "extra/Configs/Config.cris"
endif

if TARGET_frv
source "extra/Configs/Config.frv"
endif

if TARGET_h8300
source "extra/Configs/Config.h8300"
endif

if TARGET_hppa
source "extra/Configs/Config.hppa"
endif

if TARGET_i386
source "extra/Configs/Config.i386"
endif

if TARGET_ia64
source "extra/Configs/Config.ia64"
endif

if TARGET_lm32
source "extra/Configs/Config.lm32"
endif

if TARGET_m68k
source "extra/Configs/Config.m68k"
endif

if TARGET_metag
source "extra/Configs/Config.metag"
endif

if TARGET_nds32
source "extra/Configs/Config.nds32"
endif

if TARGET_nios2
source "extra/Configs/Config.nios2"
endif

if TARGET_microblaze
source "extra/Configs/Config.microblaze"
endif

if TARGET_mips
source "extra/Configs/Config.mips"
endif

if TARGET_or1k
source "extra/Configs/Config.or1k"
endif

if TARGET_powerpc
source "extra/Configs/Config.powerpc"
endif

if TARGET_sh
source "extra/Configs/Config.sh"
endif

if TARGET_sparc
source "extra/Configs/Config.sparc"
endif

if TARGET_x86_64
source "extra/Configs/Config.x86_64"
endif

if TARGET_xtensa
source "extra/Configs/Config.xtensa"
endif

if TARGET_c6x
source "extra/Configs/Config.c6x"
endif

if TARGET_arc
source "extra/Configs/Config.arc"
endif

config TARGET_SUBARCH
	string
	default "e500" if CONFIG_E500
	default "classic" if CONFIG_CLASSIC
	default "sh4" if CONFIG_SH4
	default "sh4" if CONFIG_SH4A
	default "" if CONFIG_386
	default "i486" if CONFIG_486
	default "i586" if CONFIG_586
	default "i686" if CONFIG_686
	default "arcv2" if CONFIG_ARC_CPU_HS
	default ""

source "extra/Configs/Config.in.arch"

endmenu

menu "General Library Settings"

config HAVE_NO_PIC
	bool

config DOPIC
	bool "Generate only Position Independent Code (PIC)"
	default y
	depends on !HAVE_NO_PIC
	help
	  If you wish to build all of uClibc as PIC objects, then answer Y here.
	  If you are unsure, then you should answer N.

config ARCH_HAS_NO_SHARED
	bool

config ARCH_HAS_NO_LDSO
	bool
	select ARCH_HAS_NO_SHARED

config ARCH_HAS_UCONTEXT
	bool

config HAVE_SHARED
	bool "Enable shared libraries"
	depends on !ARCH_HAS_NO_SHARED
	default y
	help
	  If you wish to build uClibc with support for shared libraries then
	  answer Y here.  If you only want to build uClibc as a static library,
	  then answer N.

config FORCE_SHAREABLE_TEXT_SEGMENTS
	bool "Only load shared libraries which can share their text segment"
	depends on HAVE_SHARED
	select DOPIC
	help
	  If you answer Y here, the uClibc native shared library loader will
	  only load shared libraries, which do not need to modify any
	  non-writable segments. These libraries haven't set the DT_TEXTREL
	  tag in the dynamic section (==> objdump).
	  All your libraries must be compiled with -fPIC or -fpic, and all
	  assembler function must be written as position independent code (PIC).
	  Enabling this option will make uClibc's shared library loader a
	  little bit smaller and guarantee that no memory will be wasted by
	  badly coded shared libraries.

config LDSO_LDD_SUPPORT
	bool "Native 'ldd' support"
	depends on HAVE_SHARED
	default y
	help
	  Enable all the code needed to support traditional ldd,
	  which executes the shared library loader to resolve all dependencies
	  and then provide a list of shared libraries that are required for an
	  application to function.  Disabling this option will make uClibc's
	  shared library loader a little bit smaller.
	  Most people will answer Y.

config LDSO_CACHE_SUPPORT
	bool "Enable library loader cache (ld.so.conf)"
	depends on HAVE_SHARED
	default y
	help
	  Enable this to make use of /etc/ld.so.conf, the shared library loader
	  cache configuration file to support for non-standard library paths.
	  After updating this file, it is necessary to run 'ldconfig' to update
	  the /etc/ld.so.cache shared library loader cache file.

config LDSO_PRELOAD_ENV_SUPPORT
	bool "Enable library loader LD_PRELOAD environment"
	depends on HAVE_SHARED
	default y
	help
	  Enable this to make use of LD_PRELOAD environment variable.
	  A whitespace-separated list of additional, user-specified, ELF shared
	  libraries to be loaded before all others. This can be used to
	  selectively override functions in other shared libraries. For
	  set-user-ID/set-group-ID ELF binaries, only libraries in the standard
	  search directories that are also set-user-ID will be loaded.

config LDSO_PRELOAD_FILE_SUPPORT
	bool "Enable library loader preload file (ld.so.preload)"
	depends on HAVE_SHARED
	help
	  Enable this to make use of /etc/ld.so.preload. This file contains a
	  whitespace separated list of shared libraries to be loaded before
	  the program.

config LDSO_BASE_FILENAME
	string "Shared library loader naming prefix"
	depends on HAVE_SHARED && (LDSO_CACHE_SUPPORT || LDSO_PRELOAD_FILE_SUPPORT)
	default "ld.so"
	help
	  If you wish to support both uClibc and glibc on the same system, it
	  is necessary to set this to something other than "ld.so" to avoid
	  conflicts with glibc, which also uses "ld.so".  This prevents both
	  libraries from using the same /etc/ld.so.* files.  If you wish to
	  support both uClibc and glibc on the same system then you should set
	  this to "ld-uClibc.so".

	  Most people will leave this set to the default of "ld.so".

	  WARNING: Changing the default prefix could cause problems with
	           binutils' ld !

config LDSO_STANDALONE_SUPPORT
	bool "Dynamic linker stand-alone mode support"
	depends on HAVE_SHARED
	help
	  The dynamic linker can be run either indirectly through running some
	  dynamically linked program or library (in which case no command line
	  options to the dynamic linker can be passed and, in the ELF case, the
	  dynamic linker which is stored in the .interp section of the program
	  is executed) or directly by running:

	  /lib/ld-uClibc.so.*  [OPTIONS] [PROGRAM [ARGUMENTS]]

	  Stand-alone execution is a prerequisite for adding prelink
	  capabilities to uClibc dynamic linker, as well useful for testing an
	  updated version of the dynamic linker without breaking the system.

config LDSO_PRELINK_SUPPORT
	bool "Dynamic linker prelink support"
	depends on HAVE_SHARED
	select LDSO_STANDALONE_SUPPORT
	help
	  The dynamic linker can be used in stand-alone mode by the prelink tool
	  for prelinking ELF shared libraries and binaries to speed up startup
	  time. It also is able to load and handle prelinked libraries and
	  binaries at runtime.

config UCLIBC_STATIC_LDCONFIG
	bool "Link ldconfig statically"
	depends on HAVE_SHARED
	default y
	help
	  Enable this option to statically link the ldconfig binary.

	  Making ldconfig static can be beneficial if you have a library
	  problem and need to use ldconfig to recover.  Sometimes it is
	  preferable to instead keep the size of the system down, in which
	  case you should disable this option.

config LDSO_RUNPATH
	bool "Enable ELF RUNPATH tag support"
	depends on HAVE_SHARED
	default y if LDSO_CACHE_SUPPORT
	help
	  ELF's may have dynamic RPATH/RUNPATH tags.  These tags list paths
	  which extend the library search paths.  They are really only useful
	  if a package installs libraries in non standard locations and
	  ld.so.conf support is disabled.

	  Usage of RUNPATH tags is not too common, so disabling this feature
	  should be safe for most people.

config LDSO_RUNPATH_OF_EXECUTABLE
	bool "Use executables RUNPATH/RPATH when searching for libraries."
	depends on LDSO_RUNPATH
	default n
	help
	  Use the executables RUNPATH/RPATH to find to find libraries even
	  though this behavour is not standard.  Setting this option causes
	  the uclibc dynamic linker behavour to match the glibc dynamic linker.

config LDSO_SAFE_RUNPATH
	bool "Allow only RUNPATH beginning with /"
	depends on LDSO_RUNPATH
	default y
	help
	  Allow only absolute path in RPATH/RUNPATH.

config LDSO_SEARCH_INTERP_PATH
	bool "Add ldso path to lib search path"
	depends on HAVE_SHARED
	default y
	help
	  The ldso is told where it is being executed from and can use that
	  path to find related core libraries.  This is useful by default,
	  but can be annoying in a mixed development environment.

	  i.e. if the ldso is run from /foo/boo/ldso.so, it will start its
	  library search with /foo/boo/

	  If unsure, simply say Y here.

config LDSO_LD_LIBRARY_PATH
	bool "Add LD_LIBRARY_PATH to lib search path"
	depends on HAVE_SHARED
	default y
	help
	  On hardened system it could be useful to disable the use of
	  LD_LIBRARY_PATH environment variable (a colon-separated list of
	  directories in which to search for ELF libraries at execution-time).

	  If unsure, simply say Y here.

config LDSO_NO_CLEANUP
	bool "Disable automatic unloading of dynamically loaded shared objects"
	depends on HAVE_SHARED
	help
	  If you need complete allocation traces when debugging memory leaks
	  using Valgrind in a process that dynamically loads shared objects,
	  then answer Y here. Unlike glibc, uClibc unloads all dynamically
	  loaded shared objects when a process exits, which prevents Valgrind
	  from correctly resolving the symbols from the unloaded shared objects.
	  Unless you know you need this, you should answer N.

config UCLIBC_CTOR_DTOR
	bool
	default y
	help
	  If you wish to build uClibc with support for global constructor
	  (ctor) and global destructor (dtor) support, then answer Y here.
	  When ctor/dtor support is enabled, binaries linked with uClibc must
	  also be linked with crtbegin.o and crtend.o which are provided by gcc
	  (the "*startfile:" and "*endfile:" settings in your gcc specs file
	  may need to be adjusted to include these files).  This support will
	  also add a small amount of additional size to each binary compiled vs
	  uClibc.  If you will be using uClibc with C++, or if you need the gcc
	  __attribute__((constructor)) and __attribute__((destructor)) to work,
	  then you definitely want to answer Y here.  If you don't need ctors
	  or dtors and want your binaries to be as small as possible, then
	  answer N.

config LDSO_GNU_HASH_SUPPORT
	bool "Enable GNU hash style support"
	depends on HAVE_SHARED
	help
	  Newest binutils support a new hash style named GNU-hash. The dynamic
	  linker will use the new GNU-hash section (.gnu.hash) for symbol lookup
	  if present into the ELF binaries, otherwise it will use the old SysV
	  hash style (.hash). This ensures that it is completely backward
	  compatible.
	  Further, being the hash table implementation self-contained into each
	  executable and shared libraries, objects with mixed hash style can
	  peacefully coexist in the same process.

	  If you want to use this new feature, answer Y

choice
	prompt "Thread support"
	default HAS_NO_THREADS
	help
	  If you want to compile uClibc with pthread support, then answer Y.
	  This will increase the size of uClibc by adding a bunch of locking
	  to critical data structures, and adding extra code to ensure that
	  functions are properly reentrant.

config HAS_NO_THREADS
	bool "none"
	help
	  Disable thread support.

config UCLIBC_HAS_LINUXTHREADS
	bool "Linuxthreads"
	# linuxthreads need nanosleep()
	select UCLIBC_HAS_REALTIME
	depends on !TARGET_metag
	help
	  If you want to compile uClibc with Linuxthreads support, then answer Y.

config UCLIBC_HAS_THREADS_NATIVE
	bool "Native POSIX Threading (NPTL)"
	select UCLIBC_HAS_TLS
	select UCLIBC_HAS_STDIO_FUTEXES
	select UCLIBC_HAS_REALTIME
	# i386 has no lowlevellock support (yet) as opposed to i486 onward
	depends on !CONFIG_386 && \
		   !TARGET_alpha && \
		   !TARGET_avr32 && \
		   !TARGET_bfin && \
		   !TARGET_c6x && \
		   !TARGET_cris && \
		   !TARGET_frv && \
		   !TARGET_h8300 && \
		   !TARGET_hppa && \
		   !TARGET_ia64 && \
		   !TARGET_m68k && \
		   !TARGET_nds32 && \
		   !TARGET_or1k && \
		   ARCH_USE_MMU
	help
	  If you want to compile uClibc with NPTL support, then answer Y.

endchoice

config UCLIBC_HAS_THREADS
	def_bool y if !HAS_NO_THREADS

config UCLIBC_HAS_TLS
	bool "Thread-Local Storage"
	depends on UCLIBC_HAS_THREADS_NATIVE
	help
	  If you want to enable TLS support then answer Y.
	  This is fast an efficient way to store per-thread local data
	  which is not on stack. It needs __thread support enabled in
	  gcc.

config PTHREADS_DEBUG_SUPPORT
	bool "Build pthreads debugging support"
	depends on UCLIBC_HAS_THREADS
	help
	  Say Y here if you wish to be able to debug applications that use
	  uClibc's pthreads library.  By enabling this option, a library
	  named libthread_db will be built.  This library will be dlopen()'d
	  by gdb and will allow gdb to debug the threads in your application.

	  IMPORTANT NOTE!  Because gdb must dlopen() the libthread_db library,
	  you must compile gdb with uClibc in order for pthread debugging to
	  work properly.

	  If you are doing development and want to debug applications using
	  uClibc's pthread library, answer Y.  Otherwise, answer N.


config UCLIBC_HAS_SYSLOG
	bool "Syslog support"
	default y
	depends on UCLIBC_HAS_NETWORK_SUPPORT
	select UCLIBC_HAS_SOCKET
	help
	  Support sending messages to the system logger.
	  This requires socket-support.

config UCLIBC_HAS_LFS
	bool "Large File Support"
	default y
	help
	  If you wish to build uClibc with support for accessing large files
	  (i.e. files greater then 2 GiB) then answer Y.  Do not enable this
	  if you are using an older Linux kernel (2.0.x) that lacks large file
	  support.  Enabling this option will increase the size of uClibc.

choice
	prompt "Malloc Implementation"
	default MALLOC if ! ARCH_USE_MMU
	default MALLOC_STANDARD if ARCH_USE_MMU

config MALLOC
	bool "malloc"
	help
	  "malloc" use mmap for all allocations and so works very well on
	  MMU-less systems that do not support the brk() system call.   It is
	  pretty smart about reusing already allocated memory, and minimizing
	  memory wastage.
	  This is the default for uClinux MMU-less systems.

config MALLOC_SIMPLE
	bool "malloc-simple"
	help
	  "malloc-simple" is trivially simple and slow as molasses.  It
	  was written from scratch for uClibc, and is the simplest possible
	  (and therefore smallest) malloc implementation.

	  This uses only the mmap() system call to allocate and free memory,
	  and does not use the brk() system call at all, making it a fine
	  choice for MMU-less systems with very limited memory.  It's 100%
	  standards compliant, thread safe, very small, and releases freed
	  memory back to the OS immediately rather than keeping it in the
	  process's heap for reallocation.  It is also VERY SLOW.

config MALLOC_STANDARD
	bool "malloc-standard"
	depends on ARCH_USE_MMU
	help
	  "malloc-standard" is derived from the public domain dlmalloc
	  implementation by Doug Lea.  It is quite fast, and is pretty smart
	  about reusing already allocated memory, and minimizing memory
	  wastage.  This uses brk() for small allocations, while using mmap()
	  for larger allocations.  This is the default malloc implementation
	  for uClibc.

	  If unsure, answer "malloc-standard".

endchoice

config MALLOC_GLIBC_COMPAT
	bool "Malloc returns live pointer for malloc(0)"
	help
	  The behavior of malloc(0) is listed as implementation-defined by
	  SuSv3.  Glibc returns a valid pointer to something, while uClibc
	  normally returns NULL.  I personally feel glibc's behavior is
	  not particularly safe, and allows buggy applications to hide very
	  serious problems.

	  When this option is enabled, uClibc will act just like glibc, and
	  return a live pointer when someone calls malloc(0).  This pointer
	  provides a malloc'ed area with a size of 1 byte.  This feature is
	  mostly useful when dealing with applications using autoconf's broken
	  AC_FUNC_MALLOC macro (which redefines malloc as rpl_malloc if it
	  does not detect glibc style returning-a-valid-pointer-for-malloc(0)
	  behavior).  Most people can safely answer N.

config UCLIBC_HAS_OBSTACK
	bool "Obstack Support (gnu extension)"
	help
	  When this option is enabled, uClibc will provide support for obstacks.
	  An obstack is a structure in which memory can be dynamically allocated
	  as a 'stack of objects'.  Many programs need this GNU extention and
	  you should say Y if you are using any.  Otherwise, say N to save some
	  space.

config UCLIBC_DYNAMIC_ATEXIT
	bool "Dynamic atexit() Support"
	default y
	help
	  When this option is enabled, uClibc will support an infinite number,
	  of atexit() and on_exit() functions, limited only by your available
	  memory.  This can be important when uClibc is used with C++, since
	  global destructors are implemented via atexit(), and it is quite
	  possible to exceed the default number when this option is disabled.
	  Enabling this option adds a few bytes, and more significantly makes
	  atexit and on_exit depend on malloc, which can be bad when compiling
	  static executables.

	  Unless you use uClibc with C++, you should probably answer N.

config COMPAT_ATEXIT
	bool "Old (visible) atexit Support"
	help
	  Enable this option if you want to update from 0.9.28 to git/0.9.29,
	  else you will be missing atexit() until you rebuild all apps.

config UCLIBC_HAS_UTMPX
	bool "utmpx based support for tracking login/logouts to/from the system"
	help
	  Answer y to enable support for accessing user accounting database.
	  It can be used to track all login/logout to the system.

config UCLIBC_HAS_UTMP
	bool "utmp support (XPG2 compat, SVr4 compat)"
	depends on UCLIBC_HAS_UTMPX
	help
	  Answer y to enable legacy SVID support for accessing
	  user accounting database:
		   getutent(), getutid(), getutline(), pututline(),
		   setutent(), endutent(), utmpname() in utmp.h
	  It can be used to track all login/logout to the system.

	  If unsure, answer N and use corresponding POSIX functions
	  from utmpx.h

config UCLIBC_SUSV2_LEGACY
	bool "Enable SuSv2 LEGACY functions"
	help
	  Enable this option if you want to have SuSv2 LEGACY functions
	  Currently applies to:

	  valloc

	  WARNING! ABI incompatibility.

config UCLIBC_SUSV3_LEGACY
	bool "Enable SuSv3 LEGACY functions"
	#vfork,
	# h_errno
	# gethostbyaddr
	# gethostbyname
	help
	  Enable this option if you want to have SuSv3 LEGACY functions
	  in the library, else they are replaced by SuSv3 proposed macros.
	  Currently applies to:

	  bcmp, bcopy, bzero, index, rindex, ftime,
	  bsd_signal, (ecvt), (fcvt), gcvt, (getcontext),
	  (getwd), (makecontext),
	  mktemp, (pthread_attr_getstackaddr), (pthread_attr_setstackaddr),
	  scalb, (setcontext), (swapcontext), ualarm, usleep,
	  wcswcs.

	  WARNING! ABI incompatibility.

config UCLIBC_HAS_CONTEXT_FUNCS
	bool "Use obsolescent context control functions"
	depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
	help
	  Add into library the SuSv3 obsolescent functions used for context
	  control. The setcontext family allows the implementation in C of
	  advanced control flow patterns such as iterators, fibers, and
	  coroutines. They may be viewed as an advanced version of
	  setjmp/longjmp; whereas the latter allows only a single non-local jump
	  up the stack, setcontext allows the creation of multiple cooperative
	  threads of control, each with its own stack.
	  These functions are: setcontext, getcontext, makecontext, swapcontext.

config UCLIBC_SUSV3_LEGACY_MACROS
	bool "Enable SuSv3 LEGACY macros"
	help
	  Enable this option if you want to have SuSv3 LEGACY macros.
	  Currently applies to bcopy/bzero/bcmp/index/rindex et al.
	  WARNING! ABI incompatibility.

config UCLIBC_SUSV4_LEGACY
	bool "Enable SuSv4 LEGACY or obsolescent functions"
	help
	  Enable this option if you want to have SuSv4 LEGACY functions
	  and macros in the library.
	  Currently applies to:

	  - XSI functions:
	    _longjmp, _setjmp, _tolower, _toupper, ftw, getitimer,
	    gettimeofday, isascii, pthread_getconcurrency,
	    pthread_setconcurrency, setitimer, setpgrp, sighold,
	    sigignore, sigpause, sigrelse, sigset, siginterrupt,
	    tempnam, toascii, ulimit.

	  - Base functions:
	    asctime, asctime_r, ctime, ctime_r, gets, rand_r,
	    tmpnam, utime.

	  WARNING! ABI incompatibility.

config UCLIBC_STRICT_HEADERS
	bool "Hide structures and constants for unsupported features"
	help
	  Hide structures and constants in headers that should not be used,
	  because the respective feature is disabled.

	  WARNING! enabling this option requires to patch many faulty apps,
	  since they make (wrongly) use of these structures/constants,
	  although the feature was disabled.

config UCLIBC_HAS_STUBS
	bool "Provide stubs for unavailable functionality"
	help
	  With this option uClibc provides non-functional stubs for
	  functions which are impossible to implement on the target
	  architecture. Otherwise, such functions are simply omitted.

config UCLIBC_HAS_SHADOW
	bool "Shadow Password Support"
	default y
	help
	  Answer N if you do not need shadow password support.
	  Most people will answer Y.

config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
	bool "Support for program_invocation_name"
	help
	  Support for the GNU-specific program_invocation_name and
	  program_invocation_short_name strings.  Some GNU packages
	  (like tar and coreutils) utilize these for extra useful
	  output, but in general are not required.

	  At startup, these external strings are automatically set
	  up based on the value of ARGV[0].

	  If unsure, just answer N.

config UCLIBC_HAS___PROGNAME
	bool "Support for __progname"
	default y
	help
	  Some packages (like openssh) like to peek into internal libc
	  symbols to make their output a bit more user friendly.

	  At startup, __progname is automatically set up based on the
	  value of ARGV[0].

	  If unsure, just answer N.

config UCLIBC_HAS_PTY
	bool "Support for pseudo-terminals"
	default y
	help
	  This enables support for pseudo-terminals (see man 4 pts
	  and man 7 pty).

	  If unsure, just answer Y.

config ASSUME_DEVPTS
	bool "Assume that /dev/pts is a devpts or devfs file system"
	default y
	depends on UCLIBC_HAS_PTY
	help
	  Enable this if /dev/pts is on a devpts or devfs filesystem.  Both
	  these filesystems automatically manage permissions on the /dev/pts
	  devices.  You may need to mount your devpts or devfs filesystem on
	  /dev/pts for this to work.

	  Most people should answer Y.

config UNIX98PTY_ONLY
	bool "Support only Unix 98 PTYs"
	default y
	depends on UCLIBC_HAS_PTY
	help
	  If you want to support only Unix 98 PTYs enable this.  Some older
	  applications may need this disabled and will thus use legacy BSD
	  style PTY handling which is more complex and also bigger than
	  Unix 98 PTY handling.

	  For most current programs, you can generally answer Y.

if UNIX98PTY_ONLY
config UCLIBC_HAS_GETPT
	bool "Support getpt() (glibc-compat)"
	depends on UCLIBC_HAS_PTY
	help
	  Some packages may need getpt().
	  All of those are non-standard and can be considered
	  GNU/libc compatibility.
	  Either use posix_openpt() or just open /dev/ptmx yourself.

	  If unsure, just say N.
endif

if !UNIX98PTY_ONLY
# Have to use __libc_ptyname{1,2}[] and related bloat
config UCLIBC_HAS_GETPT
	def_bool y
endif

config UCLIBC_HAS_LIBUTIL
	bool "Provide libutil library and functions"
	depends on UCLIBC_HAS_PTY
	help
	  Provide a libutil library.
	  This non-standard conforming library provides the following
	  utility functions:

	  forkpty(): combines openpty(), fork(2), and login_tty() to
	               create a new process operating in a pseudo-terminal.
	  login(): write utmp and wtmp entries
	  login_tty(): prepares for a login on the tty fd by creating a
	               new session, making fd the controlling terminal for
	               the calling process, setting fd to be the standard
	               input, output, and error streams of the current
	               process, and closing fd.
	  logout(): write utmp and wtmp entries
	  logwtmp(): constructs a utmp structure and calls updwtmp() to
	               append the structure to the utmp file.
	  openpty(): finds an available pseudo-terminal and returns
	               file descriptors for the master and slave

	  This library adds about 3k-4k to your system.

config UCLIBC_HAS_TM_EXTENSIONS
	bool "Support 'struct tm' timezone extension fields"
	default y
	help
	  Enabling this option adds fields to 'struct tm' in time.h for
	  tracking the number of seconds east of UTC, and an abbreviation for
	  the current timezone.  These fields are not specified by the SuSv3
	  standard, but they are commonly used in both GNU and BSD application
	  code.

	  To strictly follow the SuSv3 standard, leave this disabled.
	  Most people will probably want to answer Y.

config UCLIBC_HAS_TZ_CACHING
	bool "Enable caching of the last valid timezone 'TZ' string"
	default y
	help
	  Answer Y to enable caching of the last valid 'TZ' string describing
	  the timezone setting.  This allows a quick string compare to avoid
	  repeated parsing of unchanged 'TZ' strings when tzset() is called.

	  Most people will answer Y.

config UCLIBC_HAS_TZ_FILE
	bool "Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)"
	default y
	help
	  Answer Y to enable the setting of a default timezone for uClibc.

	  Ordinarily, uClibc gets the timezone information exclusively from the
	  'TZ' environment variable.  In particular, there is no support for
	  the zoneinfo directory tree or the /etc/timezone file used by glibc.

	  With this option enabled, uClibc will use the value stored in the
	  file '/etc/TZ' (default path) to obtain timezone information if the
	  'TZ' environment variable is missing or has an invalid value.  The
	  file consists of a single line (newline required) of text describing
	  the timezone in the format specified for the TZ environment variable.

	  Doing 'echo CST6CDT > /etc/TZ' is enough to create a valid file.
	  See
	  http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
	  for details on valid settings of 'TZ'.

	  Most people will answer Y.

config UCLIBC_HAS_TZ_FILE_READ_MANY
	bool "Repeatedly read the '/etc/TZ' file"
	depends on UCLIBC_HAS_TZ_FILE
	default y
	help
	  Answer Y to enable repeated reading of the '/etc/TZ' file even after
	  a valid value has been read.  This incurs the overhead of an
	  open/read/close for each tzset() call (explicit or implied).  However,
	  setting this will allow applications to update their timezone
	  information if the contents of the file change.

	  Most people will answer Y.

config UCLIBC_TZ_FILE_PATH
	string "Path to the 'TZ' file for setting the global timezone"
	depends on UCLIBC_HAS_TZ_FILE
	default "/etc/TZ"
	help
	  This is the path to the 'TZ' file.

	  Most people will use the default of '/etc/TZ'.

config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
	bool "Use /etc/localtime as a fallback"
	depends on UCLIBC_HAS_TZ_FILE
	default y
	help
	  Answer Y to try to use /etc/localtime file.
	  On glibc systems this file (if it is in TZif2 format)
	  contains timezone string at the end.

	  Most people will answer Y.

endmenu

menu "Advanced Library Settings"

config UCLIBC_PWD_BUFFER_SIZE
	int "Buffer size for getpwnam() and friends"
	default 256
	range 12 1024
	help
	  This sets the value of the buffer size for getpwnam() and friends.
	  By default, this is 256. (For reference, glibc uses 1024).
	  The value can be found using sysconf() with the _SC_GETPW_R_SIZE_MAX
	  parameter.

config UCLIBC_GRP_BUFFER_SIZE
	int "Buffer size for getgrnam() and friends"
	default 256
	range 12 1024
	help
	  This sets the value of the buffer size for getgrnam() and friends.
	  By default, this is 256. (For reference, glibc uses 1024).
	  The value can be found using sysconf() with the _SC_GETGR_R_SIZE_MAX
	  parameter.

comment "Support various families of functions"

config UCLIBC_LINUX_MODULE_26
	bool "Linux kernel module functions (2.6)"
	default y
	help
	  delete_module, init_module
	  are used in linux for loadable kernel modules.

	  Say N if you do not use kernel modules.

config UCLIBC_LINUX_SPECIFIC
	bool "Linux specific functions"
	default y
	help
	  accept4(), bdflush(),
	  capget(), capset(), eventfd(), fallocate(),
	  fstatfs(), getrandom(), inotify_*(), ioperm(), iopl(),
	  madvise(), modify_ldt(), pipe2(), personality(),
	  prctl()/arch_prctl(), pivot_root(), modify_ldt(),
	  ppoll(), readahead(), reboot(), remap_file_pages(),
	  sched_getaffinity(), sched_setaffinity(), sendfile(),
	  setfsgid(), setfsuid(), setresgid(), setresuid(),
	  splice(), vmsplice(), tee(), signalfd(), statfs(),
	  swapoff(), swapon(), sync_file_range(), syncfs(),
	  _sysctl(), sysinfo(), timerfd_*(), vhangup(), umount(),
	  umount2()

config UCLIBC_HAS_GNU_ERROR
	bool "Support GNU extensions for error-reporting"
	default y
	help
	  Support for the GNU-specific error(), error_at_line(),
	  void (* error_print_progname)(), error_message_count
	  functions and variables.  Some GNU packages
	  utilize these for extra useful output, but in general
	  are not required.

	  If unsure, just answer N.

config UCLIBC_BSD_SPECIFIC
	bool "BSD specific functions"
	default y
	help
	  mincore(), getdomainname(), setdomainname()

	  If unsure, say N.

config UCLIBC_HAS_BSD_ERR
	bool "BSD err functions"
	default y
	help
	  These functions are non-standard BSD extensions.
	  err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx()

	  If unsure, say N.

config UCLIBC_HAS_OBSOLETE_BSD_SIGNAL
	bool "BSD obsolete signal functions"
	help
	  These functions are provided as a compatibility interface for
	  programs that make use of the historical System V signal API.
	  This API is obsolete:
	  new applications should use the POSIX signal API (sigaction(2),
	  sigprocmask(2), etc.).
	  Affected functions:

	  sigset(), sighold(), sigrelse(), sigignore()

	  If unsure, say N.

config UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL
	bool "SYSV obsolete signal functions"
	help
	  Use of sysv_signal() should be avoided; use sigaction(2) instead.

	  If unsure, say N.

config UCLIBC_NTP_LEGACY
	bool "ntp_*() aliases"
	help
	  Provide legacy aliases for ntp functions:
	  ntp_adjtime(), ntp_gettime()

	  It is safe to say N here.

config UCLIBC_SV4_DEPRECATED
	bool "Enable SVr4 deprecated functions"
	help
	  These functions are DEPRECATED in System V release 4.
	  Say N unless you desparately need one of the functions below:

	  ustat() [use statfs(2) in your code instead]

config UCLIBC_HAS_REALTIME
	bool "Realtime-related family of SUSv functions"
	default y
	help
	  These functions are part of the Timers option and need not
	  be available on all implementations.
	  Includes AIO, message-queue, scheduler, semaphore functions:

	  aio.h
	  mqueue.h
	  sched.h
	  semaphore.h

	  aio_cancel()
	  aio_error()
	  aio_fsync()
	  aio_read()
	  lio_listio()
	  aio_return()
	  aio_suspend()
	  aio_write()
	  clock_getres(), clock_gettime(), clock_settime()
	  fdatasync()
	  mlockall(), munlockall()
	  mlock(), munlock()
	  mq_close()
	  mq_getattr()
	  mq_notify()
	  mq_open()
	  mq_receive()
	  mq_send()
	  mq_setattr()
	  mq_unlink()
	  nanosleep()
	  sched_getparam()
	  sched_get_priority_max(), sched_get_priority_min()
	  sched_getscheduler()
	  sched_rr_get_interval()
	  sched_setparam()
	  sched_setscheduler()
	  sem_close()
	  sem_destroy()
	  sem_getvalue()
	  sem_init()
	  sem_open()
	  sem_post()
	  sem_trywait(), sem_wait()
	  sem_unlink()
	  sigqueue()
	  sigtimedwait(), sigwaitinfo()
	  timer_create()
	  timer_delete()
	  timer_getoverrun(), timer_gettime(), timer_settime()

config UCLIBC_HAS_ADVANCED_REALTIME
	bool "Advanced realtime-related family of SUSv functions"
	default y
	depends on UCLIBC_HAS_REALTIME
	help
	  These functions are part of the Timers option and need not
	  be available on all implementations.

	  clock_getcpuclockid()
	  clock_nanosleep()
	  mq_timedreceive()
	  mq_timedsend()
	  posix_fadvise()
	  posix_fallocate()
	  posix_madvise()
	  posix_memalign()
	  posix_mem_offset()
	  posix_spawnattr_destroy(), posix_spawnattr_init()
	  posix_spawnattr_getflags(), posix_spawnattr_setflags()
	  posix_spawnattr_getpgroup(), posix_spawnattr_setpgroup()
	  posix_spawnattr_getschedparam(), posix_spawnattr_setschedparam()
	  posix_spawnattr_getschedpolicy(), posix_spawnattr_setschedpolicy()
	  posix_spawnattr_getsigdefault(), posix_spawnattr_setsigdefault()
	  posix_spawnattr_getsigmask(), posix_spawnattr_setsigmask()
	  posix_spawn_file_actions_addclose()
	  posix_spawn_file_actions_adddup2()
	  posix_spawn_file_actions_addopen()
	  posix_spawn_file_actions_destroy()
	  posix_spawn_file_actions_init()
	  posix_spawn()
	  posix_spawnp()
	  posix_typed_mem_get_info()
	  pthread_mutex_timedlock()
	  sem_timedwait()

#config UCLIBC_HAS_TERMIOS
#	bool "termios functions"
#	default y
#	help
#	  Get and set terminal attributes, line control, get and set baud
#	  rate.
#	  termios(), tcgetattr(), tcsetattr(), tcsendbreak(), tcdrain(),
#	  tcflush(), tcflow(), cfmakeraw(), cfgetospeed(), cfgetispeed(),
#	  cfsetispeed(), cfsetospeed(), cfsetspeed()
#
#	  If unsure, say Y.

config UCLIBC_HAS_EPOLL
	bool "epoll"
	default y
	help
	  epoll_create(), epoll_ctl(), epoll_wait() functions.

config UCLIBC_HAS_XATTR
	bool "Extended Attributes"
	default y
	help
	  Extended Attributes support.

	  setxattr()
	  lsetxattr()
	  fsetxattr()
	  getxattr()
	  lgetxattr()
	  fgetxattr()
	  listxattr()
	  llistxattr()
	  flistxattr()
	  removexattr()
	  lremovexattr()
	  fremovexattr()

	  Say N unless you need support for extended attributes and the
	  filesystems do actually support them.

config UCLIBC_HAS_PROFILING
	bool "Profiling support"
	default y
	help
	  gcc's -finstrument-functions needs these.

	  Most people can safely answer N.

config UCLIBC_HAS_CRYPT_IMPL
	bool "libcrypt support"
	default y
	help
	  libcrypt contains crypt(), setkey() and encrypt()

config UCLIBC_HAS_SHA256_CRYPT_IMPL
	bool "libcrypt SHA256 support"
	depends on UCLIBC_HAS_CRYPT_IMPL
	help
	  This adds support for SHA256 password hashing via the crypt() function.
	  Say N here if you do not need SHA256 crypt support.

config UCLIBC_HAS_SHA512_CRYPT_IMPL
	bool "libcrypt SHA512 support"
	depends on UCLIBC_HAS_CRYPT_IMPL
	help
	  This adds support for SHA512 password hashing via the crypt() function.
	  Say N here if you do not need SHA512 crypt support.

config UCLIBC_HAS_CRYPT_STUB
	bool "libcrypt stubs"
	default y
	depends on !UCLIBC_HAS_CRYPT_IMPL
	help
	  Standards mandate that crypt(3) provides a stub if it is unavailable.
	  If you enable this option then stubs for
	    crypt(), setkey() and encrypt()
	  will be provided in a small libcrypt.

config UCLIBC_HAS_CRYPT
	def_bool y
	depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
endmenu

menuconfig UCLIBC_HAS_NETWORK_SUPPORT
	bool "Networking Support"
	default y
	help
	  Say N here if you do not need network support.

if UCLIBC_HAS_NETWORK_SUPPORT
config UCLIBC_HAS_SOCKET
	bool "Socket support"
	default y
	help
	  If you want to include support for sockets then answer Y.

config UCLIBC_HAS_IPV4
	bool "IP version 4 support"
	default y
	select UCLIBC_HAS_SOCKET
	help
	  If you want to include support for the Internet Protocol
	  (IP version 4) then answer Y.

	  Most people will say Y.

config UCLIBC_HAS_IPV6
	bool "IP version 6 support"
	select UCLIBC_HAS_SOCKET
	help
	  If you want to include support for the next version of the Internet
	  Protocol (IP version 6) then answer Y.

	  Most people should answer N.

config UCLIBC_HAS_RPC
	bool "Remote Procedure Call (RPC) support"
	# RPC+socket-ipvX doesn't currently work.
	depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
	help
	  If you want to include RPC support, enable this.  RPC is rarely used
	  for anything except for the NFS filesystem.  Unless you plan to use
	  NFS, you can probably leave this set to N and save some space.

	  If you need to use NFS then you should answer Y.

config UCLIBC_HAS_FULL_RPC
	bool "Full RPC support"
	depends on UCLIBC_HAS_RPC
	default y if !HAVE_SHARED
	help
	  Normally we enable just enough RPC support for things like rshd and
	  nfs mounts to work.  If you find you need the rest of the RPC stuff,
	  then enable this option.  Most people can safely answer N.

config UCLIBC_HAS_REENTRANT_RPC
	bool "Reentrant RPC support"
	depends on UCLIBC_HAS_RPC
	default y if !HAVE_SHARED
	help
	  Most packages utilize the normal (non-reentrant) RPC functions, but
	  some (like exportfs from nfs-utils) need these reentrant versions.

	  Most people can safely answer N.

config UCLIBC_USE_NETLINK
	bool "Use netlink to query interfaces"
	depends on UCLIBC_HAS_SOCKET
	help
	  In newer versions of Linux (2.4.17+), support was added for querying
	  network device information via netlink rather than the old style
	  ioctl's.  Most of the time, the older ioctl style is sufficient (and
	  it is smaller than netlink), but if you find that not all of your
	  devices are being returned by the if_nameindex() function, you will
	  have to use the netlink implementation.

	  Most people can safely answer N.

config UCLIBC_SUPPORT_AI_ADDRCONFIG
	bool "Support the AI_ADDRCONFIG flag"
	depends on UCLIBC_USE_NETLINK
	help
	  The implementation of AI_ADDRCONFIG is aligned with the glibc
	  implementation using netlink to query interfaces to find both
	  ipv4 and ipv6 support. This is only needed if an application uses
	  the AI_ADDRCONFIG flag.

	  Most people can safely answer N.

config UCLIBC_HAS_BSD_RES_CLOSE
	bool "Support res_close() (bsd-compat)"
	help
	  Answer Y if you desperately want to support BSD compatibility in
	  the network code.

	  Most people will say N.

config UCLIBC_HAS_COMPAT_RES_STATE
	bool "Use compatible but bloated _res"
	default y
	help
	  Answer Y if you build network utilities and they muck with resolver
	  internals a lot (_res global structure). uclibc does not use most
	  of _res.XXX fields, and with this option OFF they won't even exist.
	  Which will make e.g. dig build fail.
	  Answering N saves around 400 bytes in bss.

config UCLIBC_HAS_EXTRA_COMPAT_RES_STATE
	bool "Use extra compatible but extra bloated _res"
	help
	  Answer Y if selecting UCLIBC_HAS_COMPAT_RES_STATE is not enough.
	  As far as I can say, this should never be needed.

config UCLIBC_HAS_RESOLVER_SUPPORT
	bool "DNS resolver functions"
	select UCLIBC_HAS_COMPAT_RES_STATE
	depends on UCLIBC_HAS_IPV4 || UCLIBC_HAS_IPV6
	help
	  Provide implementations for DNS resolver functions.
	  In particular, the following functions will be added to the
	  library:

	  ns_skiprr, ns_initparse, ns_parserr, ns_msg_getflag,
	  res_mkquery, res_init, res_ninit, res_close, res_nclose
	  res_query, res_search, res_querydomain,
	  dn_expand, dn_comp,
	  ns_name_uncompress, ns_name_ntop, ns_name_pton, ns_name_unpack,
	  ns_name_pack, ns_name_compress, ns_name_skip, dn_skipname,
	  ns_get16, ns_get32, ns_put16, ns_put32

config UCLIBC_HAS_LIBRESOLV_STUB
	bool "Provide libresolv stub"
	help
	  Provide a dummy resolv library.

endif


menu "String and Stdio Support"

config UCLIBC_HAS_STRING_GENERIC_OPT
	bool "Use faster (but larger) generic string functions"
	default y
	help
	  Answer Y to use the (tweaked) glibc generic string functions.

	  In general, they are faster (but 3-5K larger) than the base
	  uClibc string functions which are optimized solely for size.

	  Many people will answer Y.

config UCLIBC_HAS_STRING_ARCH_OPT
	bool "Use arch-specific assembly string functions (where available)"
	default y
	help
	  Answer Y to use any archtecture-specific assembly language string
	  functions available for this target plaform.

	  Note that assembly implementations are not available for all string
	  functions, so some generic (written in C) string functions may
	  still be used.

	  These are small and fast, the only reason _not_ to say Y here is
	  for debugging purposes.

config UCLIBC_HAS_STDIO_FUTEXES
	bool "Use futexes for multithreaded I/O locking"
	depends on UCLIBC_HAS_THREADS_NATIVE
	help
	  If you want to compile uClibc to use futexes for low-level
	  I/O locking, answer Y.  Otherwise, answer N.

config UCLIBC_HAS_CTYPE_TABLES
	bool "Use Table Versions Of 'ctype.h' Functions."
	default y
	help
	  Answer Y to use table versions of the 'ctype.h' functions.
	  While the non-table versions are often smaller when building
	  statically linked apps, they work only in stub locale mode.

	  Most people will answer Y.

config UCLIBC_HAS_CTYPE_SIGNED
	bool "Support Signed Characters In 'ctype.h' Functions."
	depends on UCLIBC_HAS_CTYPE_TABLES
	default y
	help
	  Answer Y to enable support for passing signed char values to
	  the 'ctype.h' functions.  ANSI/ISO C99 and SUSv3 specify that
	  these functions are only defined for unsigned char values and
	  EOF.  However, glibc allows negative signed char values as well
	  in order to support 'broken old programs'.

	  Most people will answer Y.

choice
	prompt "ctype argument checking"
	depends on UCLIBC_HAS_CTYPE_TABLES
	default UCLIBC_HAS_CTYPE_UNSAFE
	help
	  Please select the invalid arg behavior you want for the 'ctype'
	  functions.

	  The 'ctype' functions are now implemented using table lookups, with
	  the arg being the index.  This can result in incorrect memory accesses
	  or even segfaults for args outside of the allowed range.

	  NOTE: This only affects the 'ctype' _functions_.  It does not affect
	  the macro implementations.

config UCLIBC_HAS_CTYPE_UNSAFE
	bool "Do not check -- unsafe"

config UCLIBC_HAS_CTYPE_CHECKED
	bool "Detect and handle appropriately"

config UCLIBC_HAS_CTYPE_ENFORCED
	bool "Issue a diagnostic and abort()"

endchoice


config UCLIBC_HAS_WCHAR
	bool "Wide Character Support"
	help
	  Answer Y to enable wide character support.  This will make uClibc
	  much larger.  It is also currently required for locale support.

	  Most people will answer N.

config UCLIBC_HAS_LOCALE
	bool "Locale Support"
	select UCLIBC_HAS_WCHAR
	select UCLIBC_HAS_CTYPE_TABLES
	help
	  uClibc now has full ANSI/ISO C99 locale support (except for
	  wcsftime() and collating items in regex).  Be aware that enabling
	  this option will make uClibc much larger.

	  Enabling UCLIBC_HAS_LOCALE with the default set of supported locales
	  (169 UTF-8 locales, and 144 locales for other codesets) will enlarge
	  uClibc by around 300k.  You can reduce this size by building your own
	  custom set of locate data (see extra/locale/LOCALES for details).

	  uClibc's locale support is still under development.  For example,
	  codesets using shift states are not currently supported.  Support is
	  planned in the next iteration of locale support.

	  Answer Y to enable locale support.  Most people will answer N.

choice

prompt "Locale data"
	depends on UCLIBC_HAS_LOCALE
	default UCLIBC_BUILD_MINIMAL_LOCALE

config UCLIBC_BUILD_MINIMAL_LOCALE
	bool "Only selected locales"
	depends on UCLIBC_HAS_LOCALE
	help
	  If you do not need all locales that are available on your
	  host-box, then set this to 'Y'.

config UCLIBC_BUILD_ALL_LOCALE
	bool "All locales"
	depends on UCLIBC_HAS_LOCALE
	help
	  This builds all the locales that are available on your
	  host-box.

endchoice

config UCLIBC_BUILD_MINIMAL_LOCALES
	string "locales to use"
	depends on UCLIBC_BUILD_MINIMAL_LOCALE
	default "en_US"
	help
	  Space separated list of locales to use.

	  E.g.:
	      en_US en_GB de_AT
	  default:
	      en_US

config UCLIBC_HAS_XLOCALE
	bool "Extended Locale Support (experimental/incomplete)"
	depends on UCLIBC_HAS_LOCALE
	help
	  Answer Y to enable extended locale support similar to that provided
	  by glibc.  This is primarily intended to support libstd++
	  functionality.
	  However, it also allows thread-specific locale selection via
	  uselocale().

	  Most people will answer N.

config UCLIBC_HAS_HEXADECIMAL_FLOATS
	bool "Support hexadecimal float notation"
	depends on UCLIBC_HAS_CTYPE_TABLES
	depends on UCLIBC_HAS_FLOATS
	help
	  Answer Y to enable support for hexadecimal float notation in the
	  (wchar and) char string to floating point conversion functions, as
	   well as support for the %a and %A conversion specifiers in the
	   *printf() and *scanf() functions.

	  Most people will answer N.

config UCLIBC_HAS_GLIBC_DIGIT_GROUPING
	bool "Support glibc's \"'\" flag for allowing locale-specific digit grouping"
	depends on UCLIBC_HAS_LOCALE
	depends on UCLIBC_HAS_FLOATS
	help
	  Answer Y to enable support for glibc's \"'\" flag for allowing
	  locale-specific digit grouping in base 10 integer conversions and
	  appropriate floating point conversions in the *printf() and *scanf()
	  functions.

	  Most people will answer N.

config UCLIBC_HAS_SCANF_LENIENT_DIGIT_GROUPING
	bool "Do not require digit grouping when the \"'\" flag is specified"
	depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
	default y
	help
	  Answer Y to make digit grouping optional when the \"'\" flag is
	  specified.
	  This is the standard glibc behavior.  If the initial string of digits
	  exceeds the maximum group number, the input will be treated as a
	  normal non-grouped number.

	  Most people will answer N.

config UCLIBC_HAS_GLIBC_CUSTOM_PRINTF
	bool "Support glibc's register_printf_function() (glibc-compat)"
	depends on !USE_OLD_VFPRINTF
	help
	  Answer Y to support glibc's register_printf_function() to allow an
	  application to add its own printf conversion specifiers.
	  parse_printf_format() is also enabled.

	  NOTE: Limits the number or registered specifiers to 10.
	  NOTE: Requires new conversion specifiers to be ASCII
	        characters (0-0x7f).  This is to avoid problems with processing
	        format strings in locales with different multibyte conversions.

	  Most people will answer N.

config USE_OLD_VFPRINTF
	bool "Use the old vfprintf implementation"
	depends on !UCLIBC_HAS_WCHAR
	help
	  Set to true to use the old vfprintf instead of the new.  This is
	  roughly C89 compliant with some extensions, and is much smaller.
	  However, it does not support wide chars, positional args, or glibc
	  custom printf specifiers.

	  Most people will answer N.

config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
	int "Maximum number of positional args.  Either 0 or >= 9."
	depends on !USE_OLD_VFPRINTF
	default 9
	help
	  Set the maximum number of positional args supported by the
	  printf/scanf functions.  The Single Unix Specification Version 3
	  requires a minimum value of 9.  Setting this to a value lower than
	  9 will disable positional arg support and cause the NL_ARGMAX macro
	  in limits.h to be #undef'd.

	  WARNING!  The workspace to support positional args is currently
	            allocated on the stack.  You probably don't want to set
		    this to too high a value.

	  Most people will answer 9.

choice
	prompt "Stdio buffer size"
	default UCLIBC_HAS_STDIO_BUFSIZ_4096
	help
	  Please select a value for BUFSIZ.  This will be used by the
	  stdio subsystem as the default buffer size for a file, and
	  affects fopen(), setvbuf(), etc.

	  NOTE: Setting this to 'none' will disable buffering completely.
	  However, BUFSIZ will still be defined in stdio.h as 256 because
	  many applications use this value.

config UCLIBC_HAS_STDIO_BUFSIZ_NONE
	bool "none (WARNING - BUFSIZ will be 256 in stdio.h)"
	depends on !UCLIBC_HAS_WCHAR

config UCLIBC_HAS_STDIO_BUFSIZ_256
	bool "256 (minimum ANSI/ISO C99 value)"

config UCLIBC_HAS_STDIO_BUFSIZ_512
	bool "512"

config UCLIBC_HAS_STDIO_BUFSIZ_1024
	bool "1024"

config UCLIBC_HAS_STDIO_BUFSIZ_2048
	bool "2048"

config UCLIBC_HAS_STDIO_BUFSIZ_4096
	bool "4096"

config UCLIBC_HAS_STDIO_BUFSIZ_8192
	bool "8192"

# If you add more choices, you will need to update uClibc_stdio.h.

endchoice

choice
	prompt "Stdio builtin buffer size (uClibc-specific)"
	depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
	default UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
	help
	  When a FILE is created with fopen(), an attempt is made to allocate
	  a BUFSIZ buffer for it.  If the allocation fails, fopen() will still
	  succeed but the FILE will be unbuffered.

	  This option adds a small amount of space to each FILE to act as an
	  emergency buffer in the event of a buffer allocation failure.

	  Most people will answer None.

config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE
	bool "None"

config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4
	bool "4"

config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
	bool "8"

# If you add more choices, you will need to update uClibc_stdio.h.

endchoice

config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
	bool "Attempt to shutdown stdio subsystem when abort() is called."
	help
	  ANSI/ISO C99 requires abort() to be asyn-signal-safe.  So there was
	  a behavioral change made in SUSv3.  Previously, abort() was required
	  to have the affect of fclose() on all open streams.  The wording has
	  been changed to "may" from "shall".

	  Most people will answer N.

config UCLIBC_HAS_STDIO_GETC_MACRO
	bool "Provide a macro version of getc()"
	depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
	default y
	help
	  Provide a macro version of getc().

	  Most people will answer Y.

config UCLIBC_HAS_STDIO_PUTC_MACRO
	bool "Provide a macro version of putc()"
	depends on !UCLIBC_HAS_STDIO_BUFSIZ_NONE
	default y
	help
	  Provide a macro version of putc().

	  Most people will answer Y.

config UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION
	bool "Support auto-r/w transition"
	default y
	help
	  Answer Y to enable the stdio subsystem to automaticly transition
	  between reading and writing.  This relaxes the ANSI/ISO C99
	  requirement:

	  When a file is opened with update mode ('+' as the second or third
	  character in the list of mode argument values), both input and output
	  may be performed on the associated stream. However, output shall not
	  be directly followed by input without an intervening call to the
	  fflush function or to a file positioning function (fseek, fsetpos,
	  or rewind), and input shall not be directly followed by output without
	  an intervening call to a file positioning function, unless the input
	  operation encounters endoffile.

	  Most people will answer Y.

config UCLIBC_HAS_FOPEN_LARGEFILE_MODE
	bool "Support an fopen() 'F' flag for large file mode (uClibc-specific)"
	depends on UCLIBC_HAS_LFS
	help
	  Answer Y to enable a uClibc-specific extension to allow passing an
	  additional 'F' flag in the mode string for fopen() to specify that
	  the file should be open()ed with the O_LARGEFILE flag set.

	  Most people will answer N.

config UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE
	bool "Support an fopen() 'x' flag for exclusive mode (glibc-compat)"
	help
	  Answer Y to support a glibc extension to allow passing
	  additional 'x' flag in the mode string for fopen() to specify that
	  the file should be open()ed with the O_EXCL flag set.

	  Most people will answer N.

config UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE
	bool "Support an fopen() 'e' flag for close-on-exec mode (glibc-compat)"
	help
	  Answer Y to support a glibc extension to allow passing
	  additional 'e' flag in the mode string for fopen() to specify that
	  the file should be open()ed with the O_CLOEXEC flag set.

	  Most people will answer N.

config UCLIBC_HAS_GLIBC_CUSTOM_STREAMS
	bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
	help
	  Answer Y to support the glibc 'custom stream' extension functions
	  fmemopen(), open_memstream(), and fopencookie().

	  NOTE: There are some minor differences regarding seeking behavior.

	  Most people will answer N.

config UCLIBC_HAS_PRINTF_M_SPEC
	bool "Support the '%m' specifier in printf format strings (glibc-compat)"
	help
	  Answer Y to support a glibc extension to interpret '%m' in printf
	  format strings as an instruction to output the error message string
	  (as generated by strerror) corresponding to the current value of
	  'errno'.

	  Most people will answer N.

config UCLIBC_HAS_ERRNO_MESSAGES
	bool "Include the errno message text in the library"
	default y
	help
	  Answer Y if you want to include the errno message text in the
	  library.  This adds about 3K to the library, but enables strerror()
	  to generate text other than 'Unknown error <number>'.

	  Most people will answer Y.

config UCLIBC_HAS_SYS_ERRLIST
	bool "Support sys_errlist[] (obsolete-compat)"
	depends on UCLIBC_HAS_ERRNO_MESSAGES
	help
	  Answer Y if you want to support the obsolete sys_errlist[].
	  This adds about 0.5k to the library, except for the mips
	  arch where it adds over 4K.

	  WARNING!  In the future, support for sys_errlist[] may be unavailable
	            in at least some configurations.  In fact, it may be removed
	            altogether.

	  Most people will answer N.

	  Application writers: use the strerror(3) function.

config UCLIBC_HAS_SIGNUM_MESSAGES
	bool "Include the signum message text in the library"
	default y
	help
	  Answer Y if you want to include the signum message text in the
	  library.  This adds about 0.5K to the library, but enables strsignal()
	  to generate text other than 'Unknown signal <number>'.

	  Most people will answer Y.

config UCLIBC_HAS_SYS_SIGLIST
	bool "Support sys_siglist[] (bsd-compat)"
	depends on UCLIBC_HAS_SIGNUM_MESSAGES
	help
	  Answer Y if you want to support sys_siglist[].

	  WARNING!  In the future, support for sys_siglist[] may be unavailable
	            in at least some configurations.  In fact, it may be removed
		    altogether.

	  Most people will answer N.

config UCLIBC_HAS_GNU_GETOPT
	bool "Support gnu getopt"
	default y
	help
	  Answer Y if you want to include full gnu getopt() instead of a
	  (much smaller) SUSv3 compatible getopt().
	  Note that getopt_long, getopt_long_only as well as getsubopt
	  are implemented on top of this choice.

	  Most people will answer Y.

config UCLIBC_HAS_GETOPT_LONG
	bool "Support getopt_long/getopt_long_only (glibc-compat)"
	default y
	help
	  Answer Y if you want to include getopt_long[_only()] used by many
	  apps.

	  Most people will answer Y.

config UCLIBC_HAS_GNU_GETSUBOPT
	bool "Support getsubopt"
	default y
	help
	  Answer Y if you want to include getsubopt().

	  Most people will answer Y.

config UCLIBC_HAS_ARGP
	bool "Support argp (as standalone shared object)"
	select UCLIBC_HAS_GETOPT_LONG
	select UCLIBC_HAS_GNU_GETOPT
	default n
	help
	  Argp is an interface for parsing unix-style argument vectors. Unlike
	  the common getopt interface, it provides many advanced features in
	  addition to parsing options, such as automatic output in response to
	  `--help' and `--version' options.
	  A library can export an argp option parser, which programs can easily
	  use in conjunction with their own option parser.
	  Argp support is needed by elfutils libdw.

	  Most people can safely answer N.

endmenu


menu "Big and Tall"

config UCLIBC_HAS_REGEX
	bool "Regular Expression Support"
	default y
	help
	  POSIX regular expression code is really big -- 53k all by itself.
	  If you don't use regular expressions, turn this off and save space.
	  Of course, if you only statically link, leave this on, since it will
	  only be included in your apps if you use regular expressions.

config UCLIBC_HAS_REGEX_OLD
	bool "Use the older (stable) regular expression code"
	depends on UCLIBC_HAS_REGEX
	default y
	help
	  There are two versions of regex.  The older (stable) version has
	  been in uClibc for quite a long time but hasn't seen too many
	  updates.  It also has some known issues when dealing with uncommon
	  corner cases and multibyte/unicode strings.  However, it is quite
	  a bit smaller than the newer version.

	  If the older version has worked for you and you don't need unicode
	  support, then stick with the old version (and say Y here).
	  Otherwise, you should use the new version (and say N here).

config UCLIBC_HAS_FNMATCH
	bool "fnmatch Support"
	default y
	help
	  POSIX fnmatch.

config UCLIBC_HAS_FNMATCH_OLD
	bool "Use the older (stable) fnmatch code"
	depends on UCLIBC_HAS_FNMATCH
	default y
	help
	  There are two versions of fnmatch.  The older (stable) version has
	  been in uClibc for quite a long time but hasn't seen too many
	  updates.  It also has some known issues when dealing with uncommon
	  corner cases and multibyte/unicode strings.  However, it is quite
	  a bit smaller than the newer version.

	  If the older version has worked for you and you don't need unicode
	  support, then stick with the old version (and say Y here).
	  Otherwise, you should use the new version (and say N here).

config UCLIBC_HAS_WORDEXP
	bool "Support the wordexp() interface"
	depends on UCLIBC_HAS_GLOB
	help
	  The SuSv3 wordexp() interface performs word expansions per the  Shell
	  and Utilities volume of IEEE Std 1003.1-2001, Section 2.6.  It is
	  intended for use by applications that want to implement all of the
	  standard Bourne shell expansions on input data.

	  This interface is rarely used, and very large.  Unless you have a
	  pressing need for wordexp(), you should probably answer N.

config UCLIBC_HAS_NFTW
	bool "Support the nftw() interface"
	help
	  The SuSv3 nftw() interface is used to recursively descend
	  directory paths while repeatedly calling a function.

	  This interface is rarely used, and adds around 4.5k.  Unless you have
	  a pressing need for nftw(), you should probably answer N.

config UCLIBC_HAS_FTW
	bool "Support the ftw() interface (SUSv4-obsolete)"
	depends on UCLIBC_SUSV4_LEGACY
	help
	  The SuSv3 ftw() interface is used to recursively descend
	  directory paths while repeatedly calling a function.

	  This interface is rarely used, and adds around 4.5k.  Unless you have
	  a pressing need for ftw(), you should probably answer N.

config UCLIBC_HAS_FTS
	bool "Support the fts() interface (bsd-compat)"
	help
	  The fts functions are provided for traversing UNIX file hierarchies.

	  This interface is currently used by the elfutils and adds
	  around 7.5k.
	  You should port your application to use the POSIX nftw()
	  interface.

	  Unless you need to build/use elfutils, you should prolly answer N.

config UCLIBC_HAS_GLOB
	bool "Support the glob() interface"
	depends on UCLIBC_HAS_FNMATCH
	default y
	help

	  The glob interface is somewhat large (weighing in at about 2,5k).  It
	  is used fairly often, but is an option since people wanting to go for
	  absolute minimum size may wish to omit it.

	  Most people will answer Y.

config UCLIBC_HAS_GNU_GLOB
	bool "Support gnu glob() interface"
	depends on UCLIBC_HAS_GLOB
	help
	  The gnu glob interface is somewhat larger (weighing in at about 4,2k)
	  than it's SuSv3 counterpart (and is out of date). It is an old copy
	  from glibc and does not support all the GNU specific options.

	  Answer Y if you want to include full gnu glob() instead of the smaller
	  SUSv3 compatible glob().

	  Most people will answer N.

endmenu




menu "Library Installation Options"

config RUNTIME_PREFIX
	string "uClibc runtime library directory"
	default "/usr/$(TARGET_ARCH)-linux-uclibc/"
	help
	  RUNTIME_PREFIX is the directory into which the uClibc runtime
	  libraries will be installed.   The result will look something
	  like the following:
	      $(RUNTIME_PREFIX)/
	          lib/            <contains all runtime libraries>
	          usr/bin/ldd     <the ldd utility program>
	          sbin/ldconfig   <the ldconfig utility program>
	  This value is used by the 'make install' Makefile target.  Since this
	  directory is compiled into the shared library loader, you will need to
	  recompile uClibc if you change this value...

	  For a typical target system this should be set to "/", such that
	  'make install' will install /lib/libuClibc-<VERSION>.so

config DEVEL_PREFIX
	string "uClibc development environment directory"
	default "/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
	help
	  DEVEL_PREFIX is the directory into which the uClibc development
	  environment will be installed.   The result will look something
	  like the following:
	      $(DEVEL_PREFIX)/
	          lib/            <contains static libs>
		  include/        <Where all the header files go>
	  This value is used by the 'make install' Makefile target when
	  installing a uClibc development environment.

	  For a typical target system this should be set to "/usr", such that
	  'make install' will install /usr/include/<header files>.

config MULTILIB_DIR
	string "library path component"
	default "lib"
	help
	  Path component where libraries reside.

	  For a typical target system this should be set to "lib", such that
	  'make install' will install libraries to "/lib" and "/usr/lib"
	  respectively
	    DEVEL_PREFIX/MULTILIB_DIR
	    RUNTIME_PREFIX/MULTILIB_DIR

	  Other settings may include "lib32" or "lib64".

config HARDWIRED_ABSPATH
	bool "Hardwire absolute paths into linker scripts"
	default y
	help
	  This prepends absolute paths to the libraries mentioned in linker
	  scripts such as libc.so.

	  This is a build time optimization.  It has no impact on dynamic
	  linking at runtime, which doesn't use linker scripts.

	  You must disable this to use uClibc with old non-sysroot toolchains,
	  such as the prebuilt binary cross compilers at:
	     http://uclibc.org/downloads/binaries

	  The amount of time saved by this optimization is actually too small to
	  measure. The linker just had to search the library path to find the
	  linker script, so the dentries are cache hot if it has to search the
	  same path again.  But it's what glibc does, so we do it too.

endmenu


menu "Security options"

config UCLIBC_BUILD_PIE
	bool "Build utilities as ET_DYN/PIE executables"
	depends on HAVE_SHARED
	depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_nds32
	select FORCE_SHAREABLE_TEXT_SEGMENTS
	help
	  If you answer Y here, ldd and iconv are built as ET_DYN/PIE
	  executables.

	  It requires gcc-3.4 and binutils-2.15 (for arm 2.16) or later.
	  More about ET_DYN/PIE binaries on <http://pax.grsecurity.net/> .

	  WARNING: This option also enables FORCE_SHAREABLE_TEXT_SEGMENTS, so
	           all libraries have to be built with -fPIC or -fpic, and all
		   assembler functions must be written as position independent
		   code (PIC).

config UCLIBC_HAS_ARC4RANDOM
	bool "Include the arc4random() function"
	help
	  Answer Y to support the OpenBSD-like arc4random() function. This
	  function picks a random number between 0 and N, and will always return
	  something even if the random driver is dead. If urandom fails then
	  gettimeofday(2) will be used as the random seed. This function is
	  designed to be more dependable than invoking /dev/urandom directly.
	  OpenSSL and OpenNTPD currently support this function.

	  Most people will answer N.

config ARC4RANDOM_USES_NODEV
	bool "Do not use /dev/urandom with arc4random()"
	depends on UCLIBC_HAS_ARC4RANDOM
	help
	  Answer Y to use gettimeofday(2) and getpid(2) exclusively for
          arc4random(). This is not a bad idea for a diskless system, but
          it uses a lot of syscalls to stir each array element.

	  Most people will answer N.

config HAVE_NO_SSP
	bool

config UCLIBC_HAS_SSP
	bool "Support for GCC stack smashing protector"
	depends on !HAVE_NO_SSP
	help
	  Add code to support GCC's -fstack-protector[-all] option to uClibc.
	  This requires GCC 4.1 or newer.  GCC does not have to provide libssp,
	  the needed functions are added to ldso/libc instead.

	  GCC's stack protector is a reimplementation of IBM's propolice.
	  See http://www.trl.ibm.com/projects/security/ssp/ and
	  http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
	  for details.

	  Note that NOEXECSTACK on a kernel with address space randomization
	  is generally sufficient to prevent most buffer overflow exploits
	  without increasing code size.  This option essentially adds debugging
	  code to catch them.

	  Most people will answer N.

config SSP_QUICK_CANARY
	bool "Use simple guard values without accessing /dev/urandom"
	depends on UCLIBC_HAS_SSP
	help
	  Use gettimeofday(2) to define the __guard without accessing
	  /dev/urandom.
	  WARNING: This makes smashing stack protector vulnerable to timing
	  	attacks.
	  Most people will answer N.

choice
	prompt "Propolice protection blocking signal"
	depends on UCLIBC_HAS_SSP
	depends on DODEBUG
	default PROPOLICE_BLOCK_SEGV
	help
	  "abort" use SIGABRT to block offending programs.
	  This is the default implementation.

	  "segfault" use SIGSEGV to block offending programs.
	  Use this for debugging.

	  If unsure, answer "abort".

config PROPOLICE_BLOCK_ABRT
	bool "abort"

config PROPOLICE_BLOCK_SEGV
	bool "segfault"

endchoice

config UCLIBC_BUILD_SSP
	bool "Build uClibc with -fstack-protector"
	depends on UCLIBC_HAS_SSP
	help
	  Build all uClibc libraries and executables with -fstack-protector,
	  adding extra stack overflow checking to most uClibc functions.

config UCLIBC_BUILD_RELRO
	bool "Build uClibc with linker option -z RELRO"
	depends on HAVE_SHARED
	default y
	help
	  Build all libraries and executables with "ld -z relro".

	  This tells the linker to mark chunks of an executable or shared
	  library read-only after applying dynamic relocations.  (This comes
	  up when a global const variable is initialized to the address of a
	  function or the value of another global variable.)

	  This is a fairly obscure option the ld man page doesn't even bother
	  to document properly.  It's a security paranoia issue that's more
	  likely to consume memory (by allocating an extra page) rather than
	  save it.

	  This is explained in more depth at
	  http://www.airs.com/blog/archives/189

	  Nobody is likely to care whether you say Y or N here.

config UCLIBC_BUILD_NOW
	bool "Build uClibc with linker option -z NOW"
	depends on HAVE_SHARED
	help
	  Build all libraries and executables with "ld -z now".

	  This tells the linker to resolve all symbols when the library is
	  first loaded, rather than when each function is first called.  This
	  increases start-up latency by a few microseconds and may do
	  unnecessary work (resolving symbols that are never used), but the
	  realtime people like it for making microbenchmark timings slightly
	  more predictable and in some cases it can be slightly faster due to
	  CPU cache behavior (not having to fault the linker back in to do
	  lazy symbol resolution).

	  Most people can't tell the difference between selecting Y or N here.

config UCLIBC_BUILD_NOEXECSTACK
	bool "Build uClibc with noexecstack marking"
	default y
	help
	  Mark all assembler files as noexecstack, which will mark uClibc
	  as not requiring an executable stack.  (This doesn't prevent other
	  files you link against from claiming to need an executable stack, it
	  just won't cause uClibc to request it unnecessarily.)

	  This is a security thing to make buffer overflows harder to exploit.
	  By itself, it's kind of useless, as Linus Torvalds explained in 1998:
	  http://old.lwn.net/1998/0806/a/linus-noexec.html

	  It only actually provides any security when combined with address
	  space randomization, explained here: http://lwn.net/Articles/121845/

	  Address space randomization is on by default in current linux
	  kernels (although it can be disabled using the option
	  CONFIG_COMPAT_BRK).

	  You should probably say Y.

endmenu

menu "Development/debugging options"

config CROSS_COMPILER_PREFIX
	string "Cross-compiling toolchain prefix"
	default ""
	help
	  The prefix used to execute your cross-compiling toolchain.  For
	  example, if you run 'arm-linux-uclibc-gcc' to compile something,
	  then enter 'arm-linux-uclibc-' here.

config UCLIBC_EXTRA_CFLAGS
	string "Extra CFLAGS"
	default ""
	help
	  Add any additional CFLAGS to be used to build uClibc.

config DODEBUG
	bool "Enable debugging symbols"
	select EXTRA_WARNINGS
	help
	  Say Y here if you wish to compile uClibc with debugging symbols.
	  This will allow you to use a debugger to examine uClibc internals
	  while applications are running.  This increases the size of the
	  library considerably and should only be used when doing development.
	  If you are doing development and want to debug uClibc, answer Y.

	  Otherwise, answer N.

config DODEBUG_PT
	bool "Build pthread with debugging output"
	depends on UCLIBC_HAS_THREADS && UCLIBC_HAS_LINUXTHREADS
	help
	  Enable debug output in libpthread.  This is only useful when doing
	  development in libpthread itself.

	  Otherwise, answer N.

config DOSTRIP
	bool "Strip libraries and executables"
	default y
	depends on !DODEBUG
	help
	  Say Y here if you do wish to strip all uClibc libraries and
	  executables.  No stripping increases the size of the binaries
	  considerably, but makes it possible to debug uClibc libraries.
	  Most people will answer Y.

config DOASSERTS
	bool "Build with run-time assertion testing"
	help
	  Say Y here to include runtime assertion tests.
	  This enables runtime assertion testing in some code, which can
	  increase the size of the library and incur runtime overhead.
	  If you say N, then this testing will be disabled.

config SUPPORT_LD_DEBUG
	bool "Build the shared library loader with debugging support"
	depends on HAVE_SHARED
	help
	  Answer Y here to enable all the extra code needed to debug the uClibc
	  native shared library loader.  The level of debugging noise that is
	  generated depends on the LD_DEBUG environment variable...  Just set
	  LD_DEBUG to something like: 'LD_DEBUG=token1,token2,..  prog' to
	  debug your application.  Diagnostic messages will then be printed to
	  the stderr.

	  For now these debugging tokens are available:
	    detail        provide more information for some options
	    move          display copy processing
	    symbols       display symbol table processing
	    reloc         display relocation processing; detail shows the
	                  relocation patch
	    nofixups      never fixes up jump relocations
	    bindings      displays the resolve processing (function calls);
	                  detail shows the relocation patch
	    all           Enable everything!

	  The additional environment variable:
	    LD_DEBUG_OUTPUT=file
	  redirects the diagnostics to an output file created using
	  the specified name and the process id as a suffix.

	  An excellent start is simply:
	    $ LD_DEBUG=binding,move,symbols,reloc,detail ./appname
	  or to log everything to a file named 'logfile', try this
	    $ LD_DEBUG=all LD_DEBUG_OUTPUT=logfile ./appname

	  If you are doing development and want to debug uClibc's shared library
	  loader, answer Y.  Mere mortals answer N.

config SUPPORT_LD_DEBUG_EARLY
	bool "Build the shared library loader with early debugging support"
	depends on HAVE_SHARED
	help
	  Answer Y here to if you find the uClibc shared library loader is
	  crashing or otherwise not working very early on.  This is typical
	  only when starting a new port when you haven't figured out how to
	  properly get the values for argc, argv, environ, etc.  This method
	  allows a degree of visibility into the very early shared library
	  loader initialization process.  If you are doing development and want
	  to debug the uClibc shared library loader early initialization,
	  answer Y.  Mere mortals answer N.

config UCLIBC_MALLOC_DEBUGGING
	bool "Build malloc with debugging support"
	depends on MALLOC || MALLOC_STANDARD
	select DOASSERTS
	help
	  Answer Y here to compile extra debugging support code into malloc.
	  Malloc debugging output may then be enabled at runtime using the
	  MALLOC_DEBUG environment variable.

	  The value of MALLOC_DEBUG should be an integer, which is interpreted
	  as a bitmask with the following bits:
		  1   -  do extra consistency checking
		  2   -  output messages for malloc/free calls and OS
		         allocation calls
		  4   -  output messages for the `MMB' layer
		  8   -  output messages for internal malloc heap manipulation
		         calls

	  Because this increases the size of malloc appreciably (due to strings
	  etc), you should say N unless you need to debug a malloc problem.

config UCLIBC_HAS_BACKTRACE
	bool "Add support for application self-debugging"
	depends on HAVE_SHARED
	help
	  Answer Y here to compile support for application self-debugging that
	  provides the following new functions:
	  backtrace, backtrace_symbols, backtrace_symbols_fd

	  The backtrace functionality is currently supported on some platforms, and it
	  based on dwarf2 informations to properly work, so any application that
	  want to use backtrace needs to be built with -fexceptions flag.

	  The symbol names may be unavailable without the use of special linker
	  options. For systems using the GNU linker, it is necessary to use the
	  -rdynamic linker option too. Note that names of "static" functions are not
	  exposed, and won't be available in the backtrace.

config WARNINGS
	string "Compiler Warnings"
	default "-Wall"
	help
	  Set this to the set of compiler warnings you wish to see while compiling.

config EXTRA_WARNINGS
	bool "Enable extra annoying warnings"
	help
	  If you wish to build with extra warnings enabled, say Y here.

endmenu