diff options
Diffstat (limited to 'config/libc/newlib.in')
| -rw-r--r-- | config/libc/newlib.in | 192 |
1 files changed, 190 insertions, 2 deletions
diff --git a/config/libc/newlib.in b/config/libc/newlib.in index a37eca7..f43a67d 100644 --- a/config/libc/newlib.in +++ b/config/libc/newlib.in @@ -1,11 +1,10 @@ # newlib options ## depends on BARE_METAL -## ## select LIBC_SUPPORT_THREADS_NONE ## select CC_CORE_PASSES_NEEDED if CANADIAN ## select CC_CORE_PASS_2_NEEDED if ! CANADIAN -## + ## 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 @@ -29,3 +28,192 @@ config NEWLIB_HAS_NANO_MALLOC config NEWLIB_HAS_NANO_FORMATTED_IO def_bool y depends on NEWLIB_2_2_or_later + +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_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" + depends on NEWLIB_HAS_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" + depends on NEWLIB_HAS_NANO_FORMATTED_IO + 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. |