13dfbaebd1
libstdc++ is supported with Picolibc only when the toolchain version of
Picolibc is use -- libstdc++ must be built using a specific Picolibc build
and libstdc++ is included with the toolchain.
Ideally, we'd allow the use of the Picolibc module whenever we weren't
using the GNU libstdc++, including when using the minimal libc++. However,
the obvious dependency settings create a loop:
config PICOLIBC
depends on PICOLIBC_SUPPORTED
config PICOLIBC_SUPPORTED
depends on !(GLIBCXX_LIBCPP && "$(ZEPHYR_TOOCHAIN_VARIANT" = "zephyr")
config GLIBCXX_LIBCPP
depends on NEWLIB_LIBC || PICOLIBC
To break this loop, we replace GLIBCXX_LIBCPP in the second block with
CPP:
config PICOLIBC_SUPPORTED
depends on !(CPP && "$(ZEPHYR_TOOCHAIN_VARIANT" = "zephyr")
This means that picolibc cannot be used with any C++ apps when using the
Zephyr SDK, even when not using the GNU libstdc++. However, Zephyr SDK 0.16
will come with an additional Kconfig file that includes:
config PICOLIBC_SUPPORTED
def_bool y
depends on "$(ZEPHYR_TOOLCHAIN_VARIANT)" = "zephyr"
This will override the Kconfig bits included in Zephyr and allow use of the
Picolibc module with C++ code, including using the minimal libc++ bits.
Signed-off-by: Keith Packard <keithp@keithp.com>
99 lines
2.5 KiB
Plaintext
99 lines
2.5 KiB
Plaintext
# C library
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# Copyright (c) 2016 Intel Corporation
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# SPDX-License-Identifier: Apache-2.0
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menu "C Library"
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config REQUIRES_FULL_LIBC
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bool
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help
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Helper symbol to indicate some feature requires a C library implementation
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with more functionality than what MINIMAL_LIBC provides
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config SUPPORT_MINIMAL_LIBC
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bool
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default y
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# Picolibc with C++ support in Zephyr SDK is handled by Zephyr SDK's own Kconfig.
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config PICOLIBC_SUPPORTED
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bool
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depends on ARC || ARM || ARM64 || MIPS || RISCV
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depends on "$(ZEPHYR_TOOLCHAIN_VARIANT)" != "arcmwdt"
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depends on !(CPP && "$(ZEPHYR_TOOLCHAIN_VARIANT)" = "zephyr")
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default y
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help
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Selected when the target has support for picolibc.
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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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depends on SUPPORT_MINIMAL_LIBC
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help
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Build with minimal C library.
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config PICOLIBC
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bool "Picolibc library"
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select THREAD_LOCAL_STORAGE if ARCH_HAS_THREAD_LOCAL_STORAGE && TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE
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select LIBC_ERRNO if THREAD_LOCAL_STORAGE
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depends on !NATIVE_APPLICATION
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depends on PICOLIBC_SUPPORTED
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help
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Build with picolibc library. The picolibc library is built as
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a module if PICOLIBC_MODULE is set, otherwise picolibc is
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expected to be provided by the toolchain.
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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 ARCMWDT_LIBC
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bool "ARC MWDT C library"
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depends on !NATIVE_APPLICATION
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depends on "$(ZEPHYR_TOOLCHAIN_VARIANT)" = "arcmwdt"
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help
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C library provided by ARC MWDT toolchain.
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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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rsource "minimal/Kconfig"
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rsource "newlib/Kconfig"
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rsource "picolibc/Kconfig"
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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 library even though it would not have been enabled
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otherwise.
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endmenu
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