| # C library |
| |
| # Copyright (c) 2016 Intel Corporation |
| # SPDX-License-Identifier: Apache-2.0 |
| |
| config REQUIRES_FULL_LIBC |
| prompt "Require complete C library" |
| bool |
| help |
| Select a C library implementation that provides a complete C library |
| implementation, rather than the subset provided by MINIMAL_LIBC. |
| |
| config REQUIRES_FLOAT_PRINTF |
| bool "Requires floating point support in printf" |
| select CBPRINTF_FP_SUPPORT if MINIMAL_LIBC |
| select NEWLIB_LIBC_FLOAT_PRINTF if NEWLIB_LIBC |
| help |
| Select a printf implementation that provides a complete |
| implementation including floating point support. |
| |
| config LIBC_ALLOW_LESS_THAN_64BIT_TIME |
| bool "Don't require that time_t be at least 64-bits" |
| default y if NATIVE_LIBC |
| help |
| When selected, time_t will not be required to be at least 64 |
| bits. Background: To avoid Y2038 issues time_t needs to be |
| bigger than 32bits. But some C libraries do not provide or |
| default to a type for time_t which is at least |
| 64bits. Enable this option if your C library defined time_t |
| is more than 32bits (e.g. 48 bits) or are sure your project |
| is not subject to Y2038 issues. |
| |
| config FULL_LIBC_SUPPORTED |
| bool |
| help |
| Selected when the target has at least one C library that offers a |
| complete implementation and which would be selected when |
| REQUIRES_FULL_LIBC is set. |
| |
| config MINIMAL_LIBC_SUPPORTED |
| bool |
| default y |
| help |
| Selected when the target has support for the minimal C library |
| |
| config NEWLIB_LIBC_SUPPORTED |
| bool |
| default y |
| depends on "$(TOOLCHAIN_HAS_NEWLIB)" = "y" |
| select FULL_LIBC_SUPPORTED |
| help |
| Selected when the target has support for the newlib C library |
| |
| # Picolibc with C++ support in Zephyr SDK is handled by Zephyr SDK's own Kconfig. |
| config PICOLIBC_SUPPORTED |
| bool |
| depends on ("$(TOOLCHAIN_HAS_PICOLIBC)" = "y") || (ZEPHYR_PICOLIBC_MODULE && !REQUIRES_FULL_LIBCPP) |
| default y |
| select FULL_LIBC_SUPPORTED |
| help |
| Selected when the target has support for picolibc. |
| |
| config IAR_LIBC_SUPPORTED |
| bool |
| default n |
| select FULL_LIBC_SUPPORTED |
| help |
| Selected if the target is an IAR Systems compiler |
| |
| config NATIVE_LIBC_INCOMPATIBLE |
| bool |
| help |
| Other Kconfig options can select this, if they are not compatible with the |
| native/host libC, and should only be compiled with an embedded libC |
| |
| menu "C Library" |
| |
| choice LIBC_IMPLEMENTATION |
| prompt "C Library Implementation" |
| default EXTERNAL_LIBC if NATIVE_BUILD && !NATIVE_LIBC_INCOMPATIBLE |
| default PICOLIBC |
| default NEWLIB_LIBC if REQUIRES_FULL_LIBC |
| default MINIMAL_LIBC |
| default IAR_LIBC |
| |
| config MINIMAL_LIBC |
| bool "Minimal C library" |
| depends on !REQUIRES_FULL_LIBC |
| depends on MINIMAL_LIBC_SUPPORTED |
| imply COMPILER_FREESTANDING |
| select COMMON_LIBC_ABORT |
| select COMMON_LIBC_STRNLEN |
| imply COMMON_LIBC_MALLOC |
| imply COMMON_LIBC_CALLOC |
| imply COMMON_LIBC_REALLOCARRAY |
| imply COMMON_LIBC_TIME |
| help |
| Build with minimal C library. |
| |
| config PICOLIBC |
| bool "Picolibc library" |
| select COMMON_LIBC_ABORT |
| imply THREAD_LOCAL_STORAGE if ARCH_HAS_THREAD_LOCAL_STORAGE && TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE |
| select LIBC_ERRNO if THREAD_LOCAL_STORAGE |
| select NEED_LIBC_MEM_PARTITION |
| select TC_PROVIDES_POSIX_C_LANG_SUPPORT_R |
| imply COMMON_LIBC_MALLOC |
| imply COMMON_LIBC_ABORT |
| imply COMMON_LIBC_TIME |
| depends on PICOLIBC_SUPPORTED |
| help |
| Build with picolibc library. The picolibc library is built as |
| a module if PICOLIBC_MODULE is set, otherwise picolibc is |
| expected to be provided by the toolchain. |
| |
| config NEWLIB_LIBC |
| bool "Newlib C library" |
| select COMMON_LIBC_ABORT |
| depends on NEWLIB_LIBC_SUPPORTED |
| select NEED_LIBC_MEM_PARTITION |
| select TC_PROVIDES_POSIX_C_LANG_SUPPORT_R |
| imply POSIX_DEVICE_IO_ALIAS_CLOSE |
| imply POSIX_DEVICE_IO_ALIAS_OPEN |
| imply POSIX_DEVICE_IO_ALIAS_READ |
| imply POSIX_DEVICE_IO_ALIAS_WRITE |
| imply POSIX_FD_MGMT_ALIAS_LSEEK |
| imply POSIX_FILE_SYSTEM_ALIAS_FSTAT |
| imply POSIX_MULTI_PROCESS_ALIAS_GETPID |
| imply POSIX_SIGNALS_ALIAS_KILL |
| imply COMMON_LIBC_TIME |
| help |
| Build with newlib library. The newlib library is expected to be |
| part of the SDK in this case. |
| |
| config ARCMWDT_LIBC |
| bool "ARC MWDT C library" |
| depends on "$(ZEPHYR_TOOLCHAIN_VARIANT)" = "arcmwdt" |
| select STATIC_INIT_GNU |
| select LIBC_ALLOW_LESS_THAN_64BIT_TIME |
| help |
| C library provided by ARC MWDT toolchain. |
| |
| config EXTERNAL_LIBC |
| bool "External C library" |
| help |
| Build with external/user provided C library. |
| |
| config IAR_LIBC |
| bool "IAR C Runtime Library" |
| depends on IAR_LIBC_SUPPORTED |
| depends on "$(ZEPHYR_TOOLCHAIN_VARIANT)" = "iar" |
| select COMMON_LIBC_STRNLEN |
| select COMMON_LIBC_TIME |
| help |
| Use the full IAR Compiler runtime libraries. |
| A reduced Zephyr minimal libc will be used for library functionality |
| not provided by the IAR C Runtime Library. |
| |
| endchoice # LIBC_IMPLEMENTATION |
| |
| config HAS_NEWLIB_LIBC_NANO |
| bool |
| |
| rsource "common/Kconfig" |
| rsource "minimal/Kconfig" |
| rsource "newlib/Kconfig" |
| rsource "picolibc/Kconfig" |
| |
| config STDOUT_CONSOLE |
| bool "Send stdout to console" |
| depends on CONSOLE_HAS_DRIVER |
| depends on !(NATIVE_LIBRARY && EXTERNAL_LIBC) |
| default y |
| help |
| This option directs standard output (e.g. printf) to the console |
| device, rather than suppressing it entirely. See also EARLY_CONSOLE |
| option. |
| |
| config NEED_LIBC_MEM_PARTITION |
| bool |
| help |
| Hidden option to signal that a memory partition is needed for |
| the C library even though it would not have been enabled |
| otherwise. |
| |
| endmenu |
