esp-idf/components/newlib/Kconfig

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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