168 lines
4.7 KiB
Plaintext
168 lines
4.7 KiB
Plaintext
# C library
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# Copyright (c) 2016 Intel Corporation
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# SPDX-License-Identifier: Apache-2.0
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menu "C Library"
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config REQUIRES_FULL_LIBC
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bool
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help
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Helper symbol to indicate some feature requires a C library implementation
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with more functionality than what MINIMAL_LIBC provides
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choice LIBC_IMPLEMENTATION
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prompt "C Library Implementation"
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default EXTERNAL_LIBC if NATIVE_APPLICATION
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default NEWLIB_LIBC if REQUIRES_FULL_LIBC
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default MINIMAL_LIBC
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config MINIMAL_LIBC
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bool "Minimal C library"
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depends on !NATIVE_APPLICATION
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depends on !REQUIRES_FULL_LIBC
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help
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Build with minimal C library.
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config NEWLIB_LIBC
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bool "Newlib C library"
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depends on !NATIVE_APPLICATION
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help
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Build with newlib library. The newlib library is expected to be
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part of the SDK in this case.
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config EXTERNAL_LIBC
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bool "External C library"
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help
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Build with external/user provided C library.
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endchoice # LIBC_IMPLEMENTATION
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config HAS_NEWLIB_LIBC_NANO
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bool
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if NEWLIB_LIBC
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config NEWLIB_LIBC_NANO
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bool "Build with newlib-nano C library"
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depends on HAS_NEWLIB_LIBC_NANO
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default y
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help
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Build with newlib-nano library, for small embedded apps.
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The newlib-nano library for ARM embedded processors is a part of the
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GNU Tools for ARM Embedded Processors.
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config NEWLIB_LIBC_MAX_MAPPED_REGION_SIZE
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int "Maximum memory mapped for newlib heap"
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depends on MMU
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default 1048576
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help
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On MMU-based systems, indicates the maximum amount of memory which
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will be used for the newlib malloc() heap. The actual amount of
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memory used will be the minimum of this value and the amount of
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free physical memory at kernel boot.
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config NEWLIB_LIBC_MIN_REQUIRED_HEAP_SIZE
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int "Newlib minimum required heap size"
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default 2048 if NEWLIB_LIBC_NANO
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default 8192 if !NEWLIB_LIBC_NANO
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help
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Specifies the amount of memory space that must be available for the
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newlib heap. An assertion failure message will be displayed during
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initialization if the memory space available for the newlib heap is
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smaller than this value.
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config NEWLIB_LIBC_ALIGNED_HEAP_SIZE
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int "Newlib aligned heap size"
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depends on MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT
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depends on USERSPACE
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default 0
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help
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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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and user mode threads need to access this heap, then this is necessary
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to properly define an MPU region for the heap.
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If this is left at 0, then remaining system RAM will be used for this
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area and it may not be possible to program it as an MPU region.
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config NEWLIB_LIBC_FLOAT_PRINTF
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bool "Build with newlib float printf"
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help
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Build with floating point printf enabled. This will increase the size of
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the image.
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config NEWLIB_LIBC_FLOAT_SCANF
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bool "Build with newlib float scanf"
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help
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Build with floating point scanf enabled. This will increase the size of
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the image.
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endif # NEWLIB_LIBC
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if MINIMAL_LIBC
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config MINIMAL_LIBC_MALLOC
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bool "Enable minimal libc malloc implementation"
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default y
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help
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Enable the minimal libc's implementation of malloc, free, and realloc.
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Disable if you wish to provide your own implementations of these functions.
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config MINIMAL_LIBC_MALLOC_ARENA_SIZE
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int "Size of the minimal libc malloc arena"
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default 0
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depends on MINIMAL_LIBC_MALLOC
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help
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Indicate the size in bytes of the memory arena used for
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minimal libc's malloc() implementation.
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config MINIMAL_LIBC_CALLOC
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bool "Enable minimal libc trivial calloc implementation"
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default y
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help
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Enable the minimal libc's trivial implementation of calloc, which
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forwards to malloc and memset.
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config MINIMAL_LIBC_REALLOCARRAY
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bool "Enable minimal libc trivial reallocarray implementation"
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default y
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help
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Enable the minimal libc's trivial implementation of reallocarray, which
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forwards to realloc.
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config MINIMAL_LIBC_LL_PRINTF
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bool "Build with minimal libc long long printf" if !64BIT
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default y if 64BIT
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help
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Build with long long printf enabled. This will increase the size of
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the image.
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config MINIMAL_LIBC_OPTIMIZE_STRING_FOR_SIZE
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bool "Use size optimized string functions"
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default y if SIZE_OPTIMIZATIONS
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help
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Enable smaller but potentially slower implementations of memcpy and
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memset. On the Cortex-M0+ this reduces the total code size by 120 bytes.
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endif # MINIMAL_LIBC
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config STDOUT_CONSOLE
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bool "Send stdout to console"
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depends on CONSOLE_HAS_DRIVER
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depends on !NATIVE_APPLICATION
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default y
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help
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This option directs standard output (e.g. printf) to the console
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device, rather than suppressing it entirely. See also EARLY_CONSOLE
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option.
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config NEED_LIBC_MEM_PARTITION
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bool
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help
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Hidden option to signal that a memory partition is needed for
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the C libraray even though it would not have been enabled
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otherwise.
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endmenu
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