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203 lines
6.3 KiB
203 lines
6.3 KiB
# Copyright © 2021 Amazon.com, Inc. or its affiliates. |
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# SPDX-License-Identifier: Apache-2.0 |
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if PICOLIBC |
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choice PICOLIBC_SOURCE |
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prompt "Source of Picolibc" |
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default PICOLIBC_USE_TOOLCHAIN if REQUIRES_FULL_LIBCPP || "$(TOOLCHAIN_HAS_PICOLIBC)" = "y" |
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default PICOLIBC_USE_MODULE |
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config PICOLIBC_USE_MODULE |
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bool "Picolibc from module" |
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depends on ZEPHYR_PICOLIBC_MODULE |
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depends on !GLIBCXX_LIBCPP |
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help |
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Use picolibc module instead of picolibc included with toolchain. |
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This is enabled by default for toolchains other than the Zephyr |
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SDK. |
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# force TLS when using toolchain with TLS support |
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config PICOLIBC_USE_TOOLCHAIN |
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bool "Picolibc from toolchain" |
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depends on "$(TOOLCHAIN_HAS_PICOLIBC)" = "y" |
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select THREAD_LOCAL_STORAGE if ARCH_HAS_THREAD_LOCAL_STORAGE && TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE |
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help |
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Use picolibc included with the toolchain. |
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This is required when using a full C++ standard library (`REQUIRES_FULL_LIBCPP=y`). |
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endchoice # PICOLIBC_SOURCE |
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choice PICOLIBC_IO_LEVEL |
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prompt "Picolibc printf/scanf level" |
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default PICOLIBC_IO_MINIMAL if CBPRINTF_NANO |
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default PICOLIBC_IO_LONG_LONG if CBPRINTF_FULL_INTEGRAL |
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default PICOLIBC_IO_INTEGER |
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help |
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Selects the level of printf and scanf support |
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config PICOLIBC_IO_FLOAT |
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bool "full support for integer/floating point values in printf/scanf" |
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help |
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Include full floating point and integer support in printf/scanf |
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functions. |
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config PICOLIBC_IO_LONG_LONG |
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bool "full support for integer values, including long long, in printf/scanf" |
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depends on !REQUIRES_FLOAT_PRINTF && (!CBPRINTF_FP_SUPPORT || CBPRINTF_NANO) |
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help |
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Includes full integer with long long, but no floating |
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point in printf/scanf. |
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config PICOLIBC_IO_INTEGER |
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bool "full support for integer values, other than long long, in printf/scanf" |
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depends on !REQUIRES_FLOAT_PRINTF && ((!CBPRINTF_FP_SUPPORT && !CBPRINTF_FULL_INTEGRAL) || CBPRINTF_NANO) |
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help |
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Include full integer other than long long, but no floating point |
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in printf/scanf. |
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config PICOLIBC_IO_MINIMAL |
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bool "limited support for integer values in printf/scanf" |
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depends on !REQUIRES_FLOAT_PRINTF && CBPRINTF_NANO |
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help |
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Include limited integer and no floating point support in |
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printf/scanf. |
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endchoice |
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if PICOLIBC_USE_MODULE |
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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_ASSERT_VERBOSE |
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bool "assert provides verbose information" |
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help |
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The usual picolibc assert helper, __assert_func, takes file, line, |
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function and expression information to make the presented message |
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more helpful. These all require storage in the image. Unselecting |
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this option eliminates all of that information, making the results |
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less helpful but also making them consume less memory. |
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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 C99 printf and scanf support for j, z, t size |
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modifiers. C99 support is always included in the floating-point |
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variant |
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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_MINIMAL |
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help |
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Includes support for positional args (e.g. $1) in integer-only |
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printf and scanf. Positional args are always supported in the |
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floating-point variant. |
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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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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_IO_SMALL_ULTOA |
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bool "avoid soft division in printf" |
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default y |
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help |
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Replaces division and modulus by 10 with shifts and adds when |
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doing binary to decimal conversion in printf for 64-bit |
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values on 32-bit targets. |
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config PICOLIBC_IO_MINIMAL_LONG_LONG |
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bool "Include long long support in minimal printf" |
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depends on PICOLIBC_IO_MINIMAL |
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default y if CBPRINTF_FULL_INTEGRAL |
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help |
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Include long long support in the minimal picolibc printf code |
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config PICOLIBC_LOCALE_INFO |
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bool "support locales in libc functions" |
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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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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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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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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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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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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 # PICOLIBC_USE_MODULE |
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endif # PICOLIBC
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