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125 lines
4.0 KiB
Plaintext
125 lines
4.0 KiB
Plaintext
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# picolibc options
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## depends on BARE_METAL && CONFIGURE_has_meson && CONFIGURE_has_ninja
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## select LIBC_SUPPORT_THREADS_NATIVE
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## select CC_CORE_PASSES_NEEDED if CANADIAN
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## select CC_CORE_PASS_2_NEEDED if ! CANADIAN
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## help Picolibc is a C library intended for use on embedded systems. It is a
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## help conglomeration of several library parts, all under BSD-compatible software
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## help licenses that make them easily usable on embedded products. Picolibc
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## help is only available in source form. It can be compiled for a wide
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## help array of processors, and will usually work on any architecture with
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## help the addition of a few low-level routines.
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config PICOLIBC_CXA_ATEXIT
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def_bool y
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select LIBC_PROVIDES_CXA_ATEXIT
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config LIBC_PICOLIBC_TARGET_CFLAGS
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string
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prompt "Target CFLAGS for picolibc"
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default ""
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help
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Used to add specific options when compiling the target libraries
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(eg. -ffunction-sections -fdata-sections), which can't be defined
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in global TARGET_CFLAGS, because they shall be not used for the
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gcc target libraries.
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Note: Both TARGET_CFLAGS and LIBC_PICOLIBC_TARGET_CFLAGS are used
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to compile the libraries.
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Leave blank if you don't know better.
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config LIBC_PICOLIBC_IO_C99FMT
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bool
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prompt "Enable IOs on C99 formats"
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default y
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help
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Enable support for IOs on C99 formats.
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config LIBC_PICOLIBC_REGISTER_FINI
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bool
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prompt "Enable finalization function registration using atexit"
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help
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Enable finalization function registration using atexit.
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config LIBC_PICOLIBC_ATEXIT_DYNAMIC_ALLOC
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bool
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prompt "Enable dynamic allocation of atexit entries"
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help
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Enable dynamic allocation of atexit entries.
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config LIBC_PICOLIBC_GLOBAL_ATEXIT
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bool
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prompt "Enable atexit data structure as global variable"
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help
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Enable atexit data structure as global variable, instead
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of being thread-local.
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config LIBC_PICOLIBC_LITE_EXIT
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bool
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prompt "Enable lite exit"
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default y
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help
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Enable lite exit, a size-reduced implementation of exit that doesn't
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invoke clean-up functions such as _fini or global destructors.
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config LIBC_PICOLIBC_MULTITHREAD
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bool
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prompt "Enable support for multiple threads"
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default y
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help
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Enable support for multiple threads.
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config LIBC_PICOLIBC_RETARGETABLE_LOCKING
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bool
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prompt "Enable retargetable locking"
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help
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Enable retargetable locking to allow the operating system to override
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the dummy lock functions defined within picolibc.
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config LIBC_PICOLIBC_EXTRA_SECTIONS
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bool
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prompt "Place each function & data element in their own section"
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help
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Place each function & data symbol in their own section. This allows
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the linker to garbage collect unused symbols at link time.
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config LIBC_PICOLIBC_ENABLE_TARGET_OPTSPACE
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bool
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prompt "Optimize picolibc for size"
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default y
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help
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Pass --enable-target-optspace to picolibc configure.
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This will compile picolibc with -Os.
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config LIBC_PICOLIBC_LTO
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bool
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prompt "Enable Link Time Optimization"
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depends on CC_GCC_USE_LTO
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help
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Builds the libraries with -flto to enable more aggressive link time
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optimization. You will need to add -flto-partition=one to your
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application's link line to keep the RETURN assembler macro together
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with it's consumers.
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config LIBC_PICOLIBC_NANO_MALLOC
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bool
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prompt "Enable Nano Malloc"
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default y
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help
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PICOLIBC has two implementations of malloc family's functions, one in
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`mallocr.c' and the other one in `nano-mallocr.c'. This options
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enables the nano-malloc implementation, which is for small systems
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with very limited memory. Note that this implementation does not
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support `--enable-malloc-debugging' any more.
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config LIBC_PICOLIBC_EXTRA_CONFIG_ARRAY
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string
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prompt "Extra config for picolibc"
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default ""
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help
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Extra flags to pass to meson when configuring picolibc.
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