mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-22 14:12:26 +00:00
cc6b7fad46
... and the code dependent on them, after the latest wave of obsolete package removals. This concludes the glorious history of the original uClibc (non-NG) with lots of kludges removed. There was a choice here, whether to call the resulting libc "uClibc" or "uClibc-ng". I opted in favor of giving uClibc-ng the recognition it deserves, although it had some ripple effect in the ct-ng code. Signed-off-by: Alexey Neyman <stilor@att.net>
208 lines
6.7 KiB
Plaintext
208 lines
6.7 KiB
Plaintext
# newlib options
|
|
|
|
## depends on BARE_METAL
|
|
## select LIBC_PROVIDES_CXA_ATEXIT
|
|
## select LIBC_SUPPORT_THREADS_NONE
|
|
## select CC_CORE_PASS_1_NEEDED
|
|
|
|
## help Newlib is a C library intended for use on embedded systems. It is a
|
|
## help conglomeration of several library parts, all under free software
|
|
## help licenses that make them easily usable on embedded products. Newlib
|
|
## help is only available in source form. It can be compiled for a wide
|
|
## help array of processors, and will usually work on any architecture with
|
|
## help the addition of a few low-level routines.
|
|
|
|
config LIBC_NEWLIB_TARGET_CFLAGS
|
|
string
|
|
prompt "Target CFLAGS for newlib"
|
|
default ""
|
|
help
|
|
Used to add specific options when compiling the target libraries
|
|
(eg. -ffunction-sections -fdata-sections), which can't be defined
|
|
in global TARGET_CFLAGS, because they shall be not used for the
|
|
gcc target libraries.
|
|
Note: Both TARGET_CFLAGS and LIBC_NEWLIB_TARGET_CFLAGS are used
|
|
to compile the libraries.
|
|
|
|
Leave blank if you don't know better.
|
|
|
|
config LIBC_NEWLIB_IO_C99FMT
|
|
bool
|
|
prompt "Enable IOs on C99 formats"
|
|
help
|
|
Enable support for IOs on C99 formats.
|
|
|
|
config LIBC_NEWLIB_IO_LL
|
|
bool
|
|
prompt "Enable IOs on long long"
|
|
help
|
|
Enable support for IOs on long long integers.
|
|
|
|
config LIBC_NEWLIB_IO_FLOAT
|
|
bool
|
|
prompt "Enable IOs on floats and doubles"
|
|
help
|
|
Enable support for IOs on floating point
|
|
values (float and double).
|
|
|
|
config LIBC_NEWLIB_IO_LDBL
|
|
bool
|
|
prompt "Enable IOs on long doubles"
|
|
depends on LIBC_NEWLIB_IO_FLOAT
|
|
help
|
|
Enable support for IOs on long doubles.
|
|
|
|
config LIBC_NEWLIB_IO_POS_ARGS
|
|
bool
|
|
prompt "Enable printf-family positional arg support"
|
|
help
|
|
Enable printf-family positional arg support.
|
|
|
|
config LIBC_NEWLIB_FVWRITE_IN_STREAMIO
|
|
bool
|
|
prompt "Vector buffer mechanism to support stream IO buffering"
|
|
default y
|
|
help
|
|
NEWLIB implements the vector buffer mechanism to support stream IO
|
|
buffering required by C standard. This feature is possibly
|
|
unnecessary for embedded systems which won't change file buffering
|
|
with functions like `setbuf' or `setvbuf'. The buffering mechanism
|
|
still acts as default for STDIN/STDOUT/STDERR even if this option
|
|
is specified.
|
|
|
|
config LIBC_NEWLIB_UNBUF_STREAM_OPT
|
|
bool
|
|
prompt "Optimize fprintf to unbuffered unix file"
|
|
default y
|
|
help
|
|
NEWLIB does optimization when `fprintf to write only unbuffered unix
|
|
file'. It creates a temorary buffer to do the optimization that
|
|
increases stack consumption by about `BUFSIZ' bytes. Disabling this option
|
|
disables the optimization and saves size of text and stack.
|
|
|
|
config LIBC_NEWLIB_FSEEK_OPTIMIZATION
|
|
bool
|
|
prompt "Fseek optimisation"
|
|
default y
|
|
help
|
|
Disabling fseek optimisation can decrease code size.
|
|
|
|
config LIBC_NEWLIB_DISABLE_SUPPLIED_SYSCALLS
|
|
bool
|
|
prompt "Disable the syscalls supplied with newlib"
|
|
help
|
|
Disable the syscalls that come with newlib. You
|
|
will have to implement your own _sbrk, _read,
|
|
_write... If you plan to port newlib to a new
|
|
platform/board, say Yes.
|
|
|
|
config LIBC_NEWLIB_REGISTER_FINI
|
|
bool
|
|
prompt "Enable finalization function registration using atexit"
|
|
help
|
|
Enable finalization function registration using atexit.
|
|
|
|
config LIBC_NEWLIB_ATEXIT_DYNAMIC_ALLOC
|
|
bool
|
|
prompt "Enable dynamic allocation of atexit entries"
|
|
default y
|
|
help
|
|
Enable dynamic allocation of atexit entries.
|
|
|
|
config LIBC_NEWLIB_GLOBAL_ATEXIT
|
|
bool
|
|
prompt "Enable atexit data structure as global variable"
|
|
help
|
|
Enable atexit data structure as global variable. By doing so it is
|
|
move out of _reent structure, and can be garbage collected if atexit
|
|
is not referenced.
|
|
|
|
config LIBC_NEWLIB_LITE_EXIT
|
|
bool
|
|
prompt "Enable lite exit"
|
|
help
|
|
Enable lite exit, a size-reduced implementation of exit that doesn't
|
|
invoke clean-up functions such as _fini or global destructors.
|
|
|
|
config LIBC_NEWLIB_REENT_SMALL
|
|
bool
|
|
prompt "Enable small reentrant struct support"
|
|
help
|
|
Enable small reentrant struct support.
|
|
|
|
config LIBC_NEWLIB_MULTITHREAD
|
|
bool
|
|
prompt "Enable support for multiple threads"
|
|
default y
|
|
help
|
|
Enable support for multiple threads.
|
|
|
|
config LIBC_NEWLIB_RETARGETABLE_LOCKING
|
|
bool
|
|
prompt "Enable retargetable locking"
|
|
help
|
|
Enable retargetable locking to allow the operating system to override
|
|
the dummy lock functions defined within the newlib.
|
|
|
|
config LIBC_NEWLIB_EXTRA_SECTIONS
|
|
bool
|
|
prompt "Place each function & data element in their own section"
|
|
help
|
|
Place each function & data symbol in their own section. This allows
|
|
the linker to garbage collect unused symbols at link time.
|
|
|
|
config LIBC_NEWLIB_WIDE_ORIENT
|
|
bool
|
|
prompt "Allow wide C99 stream orientation"
|
|
default y
|
|
help
|
|
C99 states that each stream has an orientation, wide or byte. This
|
|
feature is possibly unnecessary for embedded systems which only do
|
|
byte input/output operations on stream. Disabling this feature can
|
|
decrease code size.
|
|
|
|
config LIBC_NEWLIB_ENABLE_TARGET_OPTSPACE
|
|
bool
|
|
prompt "Optimize newlib for size"
|
|
default y
|
|
help
|
|
Pass --enable-target-optspace to newlib configure.
|
|
|
|
This will compile newlib with -Os.
|
|
|
|
config LIBC_NEWLIB_LTO
|
|
bool
|
|
prompt "Enable Link Time Optimization"
|
|
depends on CC_GCC_USE_LTO
|
|
help
|
|
Builds the libraries with -flto to enable more aggressive link time
|
|
optimization. You will need to add -flto-partition=one to your
|
|
application's link line to keep the RETURN assembler macro together
|
|
with it's consumers.
|
|
|
|
config LIBC_NEWLIB_NANO_MALLOC
|
|
bool
|
|
prompt "Enable Nano Malloc"
|
|
help
|
|
NEWLIB has two implementations of malloc family's functions, one in
|
|
`mallocr.c' and the other one in `nano-mallocr.c'. This options
|
|
enables the nano-malloc implementation, which is for small systems
|
|
with very limited memory. Note that this implementation does not
|
|
support `--enable-malloc-debugging' any more.
|
|
|
|
config LIBC_NEWLIB_NANO_FORMATTED_IO
|
|
bool
|
|
prompt "Enable Nano Formatted I/O"
|
|
help
|
|
This builds NEWLIB with a special implementation of formatted I/O
|
|
functions, designed to lower the size of application on small systems
|
|
with size constraint issues. This option does not affect wide-char
|
|
formatted I/O functions.
|
|
|
|
config LIBC_NEWLIB_EXTRA_CONFIG_ARRAY
|
|
string
|
|
prompt "Extra config for newlib"
|
|
default ""
|
|
help
|
|
Extra flags to pass onto ./configure when configuring the newlib.
|