rt-thread/components/libc/Kconfig

menu "C/C++ and POSIX layer"

config RT_USING_INTERNAL_LIBC_ONLY
    bool "Only use tool chain internal libc"
    default n
    help
        This option is for RT-Thread Nano version.
        If select this option, it will not compile components/libc
        folder and only use tool chain internal libc. Normally, the
        tool chain internal is only cover ISO standard (e.g. armcc),
        but some tool chains' internal libc will cover more than
        ISO standard (e.g. newlib). However, no matter the cover level
        it is, the rt-thread libc leveling layer will not be involved
        at all if select this option.

config RT_USING_EXTERNAL_LIBC
    depends on !RT_USING_INTERNAL_LIBC_ONLY
    bool
    help
        This is for external libc(e.g. mlib),
        and NOT for newlib or picolibc which are inherent in the toolchains.
        Usually, the external libc should be a software package and select
        RT_USING_EXTERNAL_LIBC in software package's Kconfig
        This option is not available for users to select.

source "$RTT_DIR/components/libc/compilers/common/Kconfig"
source "$RTT_DIR/components/libc/posix/Kconfig"
source "$RTT_DIR/components/libc/cplusplus/Kconfig"

endmenu