libc: Remove the legacy printf support

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

libs/libc/stdio/Kconfig

@@ -51,15 +51,6 @@ config NUNGET_CHARS
 		Number of characters that can be buffered by ungetc() (Only if
 		FILE_STREAM equals y)
 
-config LIBC_PRINT_LEGACY
-	bool "Enable legacy printf logic"
-	default n
-	---help---
-		By default, printf (and friends) are implemented using a port from
-		newlib-nano.  That port can be signifcantly smaller, especially if
-		floating support is enabled.  This option is available, however,
-		to revert to the legacy printf version is so desired.
-
 config LIBC_FLOATINGPOINT
 	bool "Enable floating point in printf"
 	default n
@@ -86,7 +77,7 @@ config LIBC_LONG_LONG
 config LIBC_NUMBERED_ARGS
 	bool "Enable numbered arguments in printf"
 	default n
-	depends on (LIBC_FLOATINGPOINT || LIBC_LONG_LONG) && !LIBC_PRINT_LEGACY
+	depends on LIBC_FLOATINGPOINT || LIBC_LONG_LONG
 	---help---
 		Enables support for numbered arguments in printf.
 

libs/libc/stdio/Make.defs

@@ -28,24 +28,11 @@ CSRCS += lib_meminstream.c lib_memoutstream.c lib_memsistream.c
 CSRCS += lib_memsostream.c lib_lowoutstream.c
 CSRCS += lib_zeroinstream.c lib_nullinstream.c lib_nulloutstream.c
 CSRCS += lib_sscanf.c lib_vsscanf.c lib_libvscanf.c lib_libnoflush.c
-CSRCS += lib_libsnoflush.c
-
-ifeq ($(CONFIG_LIBC_PRINT_LEGACY),y)
-
-CSRCS += legacy_libvsprintf.c
-ifeq ($(CONFIG_LIBC_FLOATINGPOINT),y)
-CSRCS += legacy_dtoa.c
-endif
-
-else
-
-CSRCS += lib_libvsprintf.c lib_ultoa_invert.c
+CSRCS += lib_libsnoflush.c lib_libvsprintf.c lib_ultoa_invert.c
 ifeq ($(CONFIG_LIBC_FLOATINGPOINT),y)
 CSRCS += lib_dtoa_engine.c lib_dtoa_data.c
 endif
 
-endif
-
 # The remaining sources files depend upon C streams
 
 ifeq ($(CONFIG_FILE_STREAM),y)