165 lines
4.7 KiB
Plaintext
165 lines
4.7 KiB
Plaintext
# Copyright © 2021 Amazon.com, Inc. or its affiliates.
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# SPDX-License-Identifier: Apache-2.0
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config PICOLIBC_USE_MODULE
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bool "Use picolibc module"
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default y
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select PICOLIBC_MODULE
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help
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Use picolibc module instead of picolibc included with toolchain
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config PICOLIBC_HEAP_SIZE
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int "Picolibc heap size (bytes)"
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default 1048576 if MMU
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default 65536 if USERSPACE && MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT
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default -1
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help
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Indicates the amount of memory which will be used by the picolibc
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malloc() heap.
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If user mode is enabled, and MPU hardware has requirements that
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regions be sized to a power of two and aligned to their size,
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then this must be defined as a power of two or a compile error
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will result.
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If set to zero, then no malloc() heap will be available.
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If set to -1, then all remaining system RAM will be used for this
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area.
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config PICOLIBC_IO_LONG_LONG
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bool "support for long long in integer-only printf/scanf"
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default n
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help
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Includes support for long long in integer-only printf/scanf. long long
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types are always supported in the floating-point versions.
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config PICOLIBC_IO_FLOAT
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bool "support for floating point values in printf/scanf"
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default n
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help
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Include floating point support in printf/scanf functions.
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if PICOLIBC_USE_MODULE
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if PICOLIBC
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choice PICOLIBC_OPTIMIZATIONS
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prompt "Optimization level"
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default PICOLIBC_SIZE_OPTIMIZATIONS if SIZE_OPTIMIZATIONS
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default PICOLIBC_SPEED_OPTIMIZATIONS if SPEED_OPTIMIZATIONS
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default PICOLIBC_DEBUG_OPTIMIZATIONS if DEBUG_OPTIMIZATIONS
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default PICOLIBC_NO_OPTIMIZATIONS if NO_OPTIMIZATIONS
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help
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Note that these flags shall only control the compiler
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optimization level for picolibc, not the level for the
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rest of Zephyr
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config PICOLIBC_SIZE_OPTIMIZATIONS
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bool "Optimize for size"
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help
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Compiler optimizations will be set to -Os independently of other
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options.
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config PICOLIBC_SPEED_OPTIMIZATIONS
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bool "Optimize for speed"
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help
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Compiler optimizations will be set to -O2 independently of other
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options.
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config PICOLIBC_DEBUG_OPTIMIZATIONS
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bool "Optimize debugging experience"
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help
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Compiler optimizations will be set to -Og independently of other
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options.
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config PICOLIBC_NO_OPTIMIZATIONS
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bool "Optimize nothing"
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help
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Compiler optimizations will be set to -O0 independently of other
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options.
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endchoice
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config PICOLIBC_FAST_STRCMP
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bool "always use fast strcmp paths"
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default y
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help
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This provides a faster strcmp version even when libc is
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built in space-optimized mode
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config PICOLIBC_IO_C99_FORMATS
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bool "support C99 format additions in printf/scanf"
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default y
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help
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Includes support for hex floats (in floating-point version) and j, z,
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t size modifiers.
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config PICOLIBC_IO_POS_ARGS
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bool "Support POSIX positional args (e.g. %$1d) in printf/scanf"
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default y
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depends on !PICOLIBC_IO_FLOAT
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help
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Includes support for positional args (e.g. $1) in integer-only printf
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and scanf. Positional args are always supported in the floating-point
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versions.
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config PICOLIBC_IO_FLOAT_EXACT
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bool "support for exact float/string conversion"
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default y
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depends on PICOLIBC_USE_MODULE
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help
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Uses Ryu algorithm for exact binary/decimal float conversions.
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This ensures that printf values with enough digits can be
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fed to scanf and generate exactly the same binary value.
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config PICOLIBC_LOCALE_INFO
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bool "support locales in libc functions"
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default n
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depends on PICOLIBC_USE_MODULE
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help
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Includes code for basic locale support
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config PICOLIBC_LOCALE_EXTENDED_INFO
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bool "support extended locales in libc functions"
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default n
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depends on PICOLIBC_USE_MODULE
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help
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Includes code for extended locale support
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config PICOLIBC_MULTIBYTE
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bool "support multibyte functions in libc"
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default n
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depends on PICOLIBC_USE_MODULE
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help
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Includes code for multi-byte characters
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config PICOLIBC_PICOEXIT
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bool "use smaller atexit/onexit implementation"
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default y
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depends on PICOLIBC_USE_MODULE
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help
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Provides a simpler atexit/onexit implementation that doesn't use
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malloc, but only supports a small number (32) of exit handlers.
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config PICOLIBC_MULTITHREAD
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bool "support multiple threads using retargetable locking API"
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default y
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depends on PICOLIBC_USE_MODULE
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help
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Protects shared data structures in libc with mutexes that use
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an API which can be retargeted to OS provided routines.
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config PICOLIBC_GLOBAL_ERRNO
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bool "use a single global variable for errno"
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depends on PICOLIBC_USE_MODULE
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help
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Picolibc usually uses a TLS variable for errno, ensuring that
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multiple threads have a reliable mechanism for detecting libc
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exceptions. This option switches to a single global errno variable,
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which can be used to avoid TLS variable usage by the library if
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necessary.
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endif
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endif
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