menu "Newlib"

    choice NEWLIB_STDOUT_LINE_ENDING
        prompt "Line ending for UART output"
        default NEWLIB_STDOUT_LINE_ENDING_CRLF
        help
            This option allows configuring the desired line endings sent to UART
            when a newline ('\n', LF) appears on stdout.
            Three options are possible:

            CRLF: whenever LF is encountered, prepend it with CR

            LF: no modification is applied, stdout is sent as is

            CR: each occurence of LF is replaced with CR

            This option doesn't affect behavior of the UART driver (drivers/uart.h).

        config NEWLIB_STDOUT_LINE_ENDING_CRLF
            bool "CRLF"
        config NEWLIB_STDOUT_LINE_ENDING_LF
            bool "LF"
        config NEWLIB_STDOUT_LINE_ENDING_CR
            bool "CR"
    endchoice

    choice NEWLIB_STDIN_LINE_ENDING
        prompt "Line ending for UART input"
        default NEWLIB_STDIN_LINE_ENDING_CR
        help
            This option allows configuring which input sequence on UART produces
            a newline ('\n', LF) on stdin.
            Three options are possible:

            CRLF: CRLF is converted to LF

            LF: no modification is applied, input is sent to stdin as is

            CR: each occurence of CR is replaced with LF

            This option doesn't affect behavior of the UART driver (drivers/uart.h).

        config NEWLIB_STDIN_LINE_ENDING_CRLF
            bool "CRLF"
        config NEWLIB_STDIN_LINE_ENDING_LF
            bool "LF"
        config NEWLIB_STDIN_LINE_ENDING_CR
            bool "CR"
    endchoice

    config NEWLIB_NANO_FORMAT
        bool "Enable 'nano' formatting options for printf/scanf family"
        default n
        help
            ESP32 ROM contains parts of newlib C library, including printf/scanf family
            of functions. These functions have been compiled with so-called "nano"
            formatting option. This option doesn't support 64-bit integer formats and C99
            features, such as positional arguments.

            For more details about "nano" formatting option, please see newlib readme file,
            search for '--enable-newlib-nano-formatted-io':
            https://sourceware.org/newlib/README

            If this option is enabled, build system will use functions available in
            ROM, reducing the application binary size. Functions available in ROM run
            faster than functions which run from flash. Functions available in ROM can
            also run when flash instruction cache is disabled.

            If you need 64-bit integer formatting support or C99 features, keep this
            option disabled.

endmenu # Newlib