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#
# For a description of the syntax of this configuration file,
# see extra/config/Kconfig-language.txt
#
mainmenu "uClibc C Library Configuration"
choice
prompt "Target Architecture"
default TARGET_i386
help
Stuff
config TARGET_alpha
bool "alpha"
config TARGET_arm
bool "arm"
config TARGET_cris
bool "cris"
config TARGET_e1
bool "e1"
config TARGET_h8300
bool "h8300"
config TARGET_i386
bool "i386"
config TARGET_i960
bool "i960"
config TARGET_m68k
bool "m68k"
config TARGET_microblaze
bool "microblaze"
config TARGET_mips
bool "mips"
config TARGET_or32
bool "or32"
config TARGET_powerpc
bool "powerpc"
config TARGET_sh
bool "SuperH"
config TARGET_sparc
bool "sparc"
config TARGET_v850
bool "v850"
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_cris
source "extra/Configs/Config.cris"
endif
if TARGET_e1
source "extra/Configs/Config.e1"
endif
if TARGET_h8300
source "extra/Configs/Config.h8300"
endif
if TARGET_i386
source "extra/Configs/Config.i386"
endif
if TARGET_i960
source "extra/Configs/Config.i960"
endif
if TARGET_m68k
source "extra/Configs/Config.m68k"
endif
if TARGET_microblaze
source "extra/Configs/Config.microblaze"
endif
if TARGET_mips
source "extra/Configs/Config.mips"
endif
if TARGET_or32
source "extra/Configs/Config.or32"
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_v850
source "extra/Configs/Config.v850"
endif
source "extra/Configs/Config.in.arch"
endmenu
menu "General Library Settings"
config HAVE_NO_PIC
bool
default n
config DOPIC
bool "Generate Position Independent Code (PIC)"
default y
depends !HAVE_NO_PIC
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 HAVE_NO_SHARED
bool
default n
config HAVE_SHARED
bool "Enable support for shared libraries"
depends on DOPIC && !HAVE_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 ARCH_HAS_NO_LDSO
bool
default n
config BUILD_UCLIBC_LDSO
bool "Compile native shared library loader"
depends on HAVE_SHARED && !ARCH_HAS_NO_LDSO
default y
help
uClibc has a native shared library loader for some architectures.
If you answer Y here, the uClibc native shared library loader will
be built for your target architecture. If this option is available,
to you, then you almost certainly want to answer Y.
config FORCE_SHAREABLE_TEXT_SEGMENTS
bool "Only load shared libraries which can share their text segment"
depends on BUILD_UCLIBC_LDSO && UCLIBC_COMPLETELY_PIC
default n
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). So 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 makes uClibc's shared library loader a
little bit smaller and guarantee that no memory will be wasted by badly
coded shared libraries.
config UCLIBC_PIE_SUPPORT
bool "Support ET_DYN in shared library loader"
select FORCE_SHAREABLE_TEXT_SEGMENTS
default n
help
If you answer Y here, the uClibc native shared library loader will
support ET_DYN/PIE executables.
It requires binutils-2.14.90.0.6 or later and the usage of the
-pie option.
More about ET_DYN/PIE binaries on <http://pageexec.virtualave.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 LDSO_LDD_SUPPORT
bool "Native shared library loader 'ldd' support"
depends on BUILD_UCLIBC_LDSO
default y
help
Enable this to 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 makes uClibc's
shared library loader a little bit smaller. Most people will answer Y.
config UCLIBC_CTOR_DTOR
bool "Support global constructors and destructors"
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 UCLIBC_PROPOLICE
bool "Support for propolice stack protection"
default n
help
Propolice stack protection.
More about it on <http://www.research.ibm.com/trl/projects/security/ssp> .
To be able to use it, you'll also need a propolice patched gcc,
supporting the -fstack-protector[-all] options. It is a specially patched
gcc version, were __guard and __stack_smash_handler are removed from libgcc.
Most people will answer N.
config UCLIBC_PROFILING
bool "Support gprof profiling"
default y
help
If you wish to build uClibc with support for application profiling
using the gprof tool, then you should enable this feature. Then in
addition to building uClibc with profiling support, you will also
need to recompile all your shared libraries with the profiling
enabled version of uClibc. To add profiling support to your
applications, you must compile things using the gcc options
"-fprofile-arcs -pg". Then when you run your applications, a
gmon.out file will be generated which can then be analyzed by
'gprof'.
These exist a number of less invasive alternatives that do not
require your to specially instrument your application, and recompile
and relink everything.
Many people have had good results using the combination of Valgrind
to generate profiling information and KCachegrind for analysis:
http://developer.kde.org/~sewardj/
http://kcachegrind.sourceforge.net/
The OProfile system-wide profiler is another alternative:
http://oprofile.sourceforge.net/
Prospect is another alternative based on OProfile:
http://prospect.sourceforge.net/
And the Linux Trace Toolkit (LTT) is also a fine tool:
http://www.opersys.com/LTT/
If none of these tools do what you need, you can of course enable
this option, rebuild everything, and use 'gprof'. There is both a
size and performance penalty to profiling your applications this way,
so most people should answer N.
config HAS_NO_THREADS
bool
default n
config UCLIBC_HAS_THREADS
bool "POSIX Threading Support"
depends on !HAS_NO_THREADS
default y
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.
If your applications require pthreads, answer Y.
config PTHREADS_DEBUG_SUPPORT
bool "Build pthreads debugging support"
default n
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_LFS
bool "Large File Support"
default y
depends on !CONFIG_CRIS
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 ! UCLIBC_HAS_MMU
default MALLOC_STANDARD if UCLIBC_HAS_MMU
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.
"malloc-simple" was written from scratch for uClibc, and is the
simplest possible (and therefore smallest) malloc implementation.
It is rather dumb, and certainly isn't the fastest. But it is 100%
standards compliant, thread safe, and very small.
"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".
config MALLOC
bool "malloc"
config MALLOC_SIMPLE
bool "malloc-simple"
config MALLOC_STANDARD
bool "malloc-standard"
depends on UCLIBC_HAS_MMU
endchoice
config MALLOC_GLIBC_COMPAT
bool "Malloc returns live pointer for malloc(0)"
default n
help
The behavior of malloc(0) is listed as implementation-defined by
SuSv3. Glibc returns a valid pointer to something, while uClibc
normally return a 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_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 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 UNIX98PTY_ONLY
bool "Support only Unix 98 PTYs"
default y
help
If you want to support only Unix 98 PTYs enable this. Some older
applications may need this disabled. For most current programs,
you can generally answer Y.
config ASSUME_DEVPTS
bool "Assume that /dev/pts is a devpts or devfs file system"
default y
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 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.
Simply 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 allows 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'.
endmenu
menu "Networking Support"
config UCLIBC_HAS_IPV6
bool "IP version 6 Support"
default n
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"
default n
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.
endmenu
menu "String and Stdio Support"
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
staticly 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 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 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"
default n
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
default n
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.
config UCLIBC_PREGENERATED_LOCALE_DATA
bool "Use Pre-generated Locale Data"
depends on UCLIBC_HAS_LOCALE
default n
help
If you are selective and only want locale data for a few particular
locales, or you enjoy pain, or you are a rabid do-it-yourself sort of
person, you can turn this option off and manually walk through the
mostly undocumented procedure needed to generate your own locale
data.
Mere mortals will answer Y and use the default set of pregenerated
locale data, which supports 169 UTF-8 locales, and 144 locales for
other codesets (for the complete list see extra/locale/LOCALES).
config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
bool "Automagically Download the Pre-generated Locale Data (if necessary)"
depends on UCLIBC_PREGENERATED_LOCALE_DATA
default n
help
If you would like the build process to use 'wget' to automatically
download the pregenerated locale data, enable this option. Otherwise
you will need to obtain the locale data yourself from:
http://www.uclibc.org/downloads/uClibc-locale-030818.tgz
and place the uClibc-locale-030818.tgz tarball in the extra/locale/
directory.
Go ahead and make life easy for yourself... Answer Y.
config UCLIBC_HAS_XLOCALE
bool "Extended Locale Support (experimental/incomplete)"
depends on UCLIBC_HAS_LOCALE
default n
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 UCLIBC_HAS_CTYPE_TABLES
depends on UCLIBC_HAS_FLOATS
default n
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
default n
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
default n
help
Answer Y to support glibc's register_printf_function() to allow an
application to add its own printf conversion specifiers.
NOTE: This implementation limits the number or registered specifiers to 10.
NOTE: This implementation 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
default n
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.
config UCLIBC_HAS_SCANF_GLIBC_A_FLAG
bool "Support glibc's 'a' flag for scanf string conversions"
default n
help
NOTE!!! Currently Not Implemented!!! Just A Place Holder!! NOTE!!!
Answer Y to enable support for glibc's 'a' flag for the scanf string
conversions '%s', '%[', '%ls', '%l[', and '%S'. This is used to
auto-allocate sufficient memory to hold the data retrieved.
Most people will answer N.
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 !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 !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_GETC_MACRO
bool "Provide a macro version of getc()"
depends !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 !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
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
default n
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)"
default n
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_GLIBC_CUSTOM_STREAMS
bool "Support fmemopen(), open_memstream(), and fopencookie() (glibc-compat)"
default n
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)"
default n
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
default n
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.
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
default n
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_GETTEXT_AWARENESS
bool "Include gettext awareness"
depends on UCLIBC_HAS_LOCALE
default n
help
NOTE!!! Not yet integrated with strerror and strsignal. NOTE!!!
Answer Y if you want to include weak stub gettext support and
make the *strerror*() and strsignal() functions gettext-aware.
Currently, to get functional gettext functionality you will need
to use gnu gettext.
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().
Most people will answer Y.
endmenu
menu "Big and Tall"
config UCLIBC_HAS_REGEX
bool "Regular Expression Support"
default y
help
POSIX regular expression code is really big -- 27k all by itself.
If you don't use regular expressions, turn this off and save space.
Of course, if you only staticly link, leave this on, since it will
only be included in your apps if you use regular expressions.
config UCLIBC_HAS_WORDEXP
bool "Support the wordexp() interface"
default n
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_FTW
bool "Support the ftw() and nftw() interfaces"
default n
help
The SuSv3 ftw() and nftw() interfaces are 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() or nftw(), you should probably answer N.
config UCLIBC_HAS_GLOB
bool "Support the glob() interface"
default y
help
The glob interface is somewhat large (weighing in at about 4k). 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.
endmenu
menu "Library Installation Options"
config SHARED_LIB_LOADER_PREFIX
string "Shared library loader path"
depends on BUILD_UCLIBC_LDSO
default "$(DEVEL_PREFIX)/lib"
help
When using shared libraries, this path is the location where the
shared library will be invoked. This value will be compiled into
every binary compiled with uClibc.
For a typical target system this should be set to "/lib", such that
'make install' will install /lib/ld-uClibc.so.0.
BIG FAT WARNING:
If you do not have a shared library loader with the correct name
sitting in the directory this points to, your binaries will not
run.
config SYSTEM_LDSO
string "System shared library loader"
depends on HAVE_SHARED && !BUILD_UCLIBC_LDSO
default "/lib/ld-linux.so.2"
help
If you are using shared libraries, but do not want/have a native
uClibc shared library loader, please specify the name of your
target system's shared library loader here...
BIG FAT WARNING:
If you do not have a shared library loader with the correct name
sitting in the directory this points to, your binaries will not
run.
config RUNTIME_PREFIX
string "uClibc runtime library directory"
default "/usr/$(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>.
endmenu
menu "uClibc development/debugging options"
config DODEBUG
bool "Build uClibc with debugging symbols"
default n
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 DOASSERTS
bool "Build uClibc with run-time assertion testing"
default n
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 BUILD_UCLIBC_LDSO
default n
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 BUILD_UCLIBC_LDSO
default n
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 MALLOC
default n
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_MJN3_ONLY
bool "Manuel's hidden warnings"
default n
help
Answer Y here to see all Manuel's personal notes, warnings, and todos.
Most people will answer N.
endmenu