672aeace88
Introduce a place to share implementations of libc functions that are needed by different libc versions. Place time() in this common location so it can be shared when building for either minimal libc or armclang libc. Signed-off-by: Kumar Gala <kumar.gala@intel.com>
92 lines
2.9 KiB
Plaintext
92 lines
2.9 KiB
Plaintext
# Copyright (c) 2016 Intel Corporation
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# SPDX-License-Identifier: Apache-2.0
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if MINIMAL_LIBC
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config MINIMAL_LIBC_NON_REENTRANT_FUNCTIONS
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bool "Non-reentrant functions"
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default y if !USERSPACE
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select NEED_LIBC_MEM_PARTITION
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help
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Enable non-reentrant functions that make use of the globals; e.g.
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rand() and gmtime(). The globals must be put into a dedicated C
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library memory partition when CONFIG_USERSPACE=y, and enabling this
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option may require an additional memory protection region.
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config MINIMAL_LIBC_MALLOC
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bool "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 "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 "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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config MINIMAL_LIBC_RAND
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bool "Rand and srand functions"
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help
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Enable rand_r() for the minimal libc.
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In order to make use of the non-reentrant rand() and srand(), it is
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necessary to set CONFIG_MINIMAL_LIBC_NON_REENTRANT_FUNCTIONS=y.
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config MINIMAL_LIBC_TIME
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bool "Time functions"
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select COMMON_LIBC_TIME if POSIX_CLOCK
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default y
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help
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Enable time() and gmtime_r() for the minimal libc.
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time() requires CONFIG_POSIX_CLOCK=y because it relies on the POSIX
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clock_gettime() function.
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In order to make use of the non-reentrant gmtime(), it is necessary
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to set CONFIG_MINIMAL_LIBC_NON_REENTRANT_FUNCTIONS=y.
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config MINIMAL_LIBC_STRING_ERROR_TABLE
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bool "String error table for strerror() and strerror_r()"
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help
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Select this option to ensure that streror(), strerror_r()
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produce strings corresponding to the descriptions in errno.h.
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The string error table can add ~2kiB to ROM. As such, it is
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disabled by default. In this case, strerror() and strerror_r()
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symbols are still present, but the functions produce an empty
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string.
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endif # MINIMAL_LIBC
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