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). All your libraries must be compiled with
- -fPIC or -fpic, and all assembler function must be written as position
- independent code (PIC).
+ 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.
+ little bit smaller and guarantee that no memory will be wasted by
+ badly coded shared libraries.
config LDSO_LDD_SUPPORT
bool "Native 'ldd' support"
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.
+ shared library loader a little bit smaller.
+ Most people will answer Y.
config LDSO_CACHE_SUPPORT
bool "Enable library loader cache (ld.so.conf)"
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.
+ 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.
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.
+ "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 "Old (visible) atexit Support"
default n
help
- Enable this option if you want to update from 0.9.28 to svn/0.9.29, else
- you will be missing atexit() until you rebuild all apps.
+ Enable this option if you want to update from 0.9.28 to svn/0.9.29,
+ else you will be missing atexit() until you rebuild all apps.
config UCLIBC_SUSV3_LEGACY
bool "Enable SuSv3 LEGACY functions"
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.
+ 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'.
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.
+ 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.
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.
+ 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_CTYPE_TABLES
default UCLIBC_HAS_CTYPE_UNSAFE
help
- Please select the invalid arg behavior you want for the 'ctype' functions.
+ 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
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().
+ 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.
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.
+ 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.
depends on UCLIBC_HAS_GLIBC_DIGIT_GROUPING
default y
help
- Answer Y to make digit grouping optional when the \"'\" flag is specified.
+ 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.
+ exceeds the maximum group number, the input will be treated as a
+ normal non-grouped number.
Most people will answer N.
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
+ 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.
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.
+ 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.
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.
+ 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.
bool "Attempt to shutdown stdio subsystem when abort() is called."
default n
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".
+ 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.
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.
+ 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.
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'.
+ (as generated by strerror) corresponding to the current value of
+ 'errno'.
Most people will answer N.
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.
+ in at least some configurations. In fact, it may be removed
+ altogether.
Most people will answer N.
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.
+ in at least some configurations. In fact, it may be removed
+ altogether.
Most people will answer N.
depends on UCLIBC_HAS_GLOB
default n
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.
+ 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().
+ Answer Y if you want to include full gnu glob() instead of the smaller
+ SUSv3 compatible glob().
Most people will answer N.
select FORCE_SHAREABLE_TEXT_SEGMENTS
default n
help
- If you answer Y here, ldd and iconv are built as ET_DYN/PIE executables.
+ 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).
+
+ 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"
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
+ 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
+ bindings displays the resolve processing (function calls);
+ detail shows the relocation patch
all Enable everything!
The additional environment variable:
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:
+ 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
+ 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
+ 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.
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