posix: device_io: require a full libc for c89 functions
The POSIX_DEVICE_IO Option Group requires a number of c89
functions mainly from stdio.h .
Namely,
clearerr(), fclose(), feof(), ferror(), fflush(), fetc(),
fgets(), fprintf(), fputc(), fputs(), fread(), freopen(),
fscanf(), fwrite(), getc(), getchar(), gets(), perror(),
printf(), putc(), putchar(), puts(), scanf(), setbuf(),
setvbuf(), ungetc(), vfprintf(), vfscanf(), vfprintf(), and
vscanf().
Additionally, symbols stdin, stdout, and stderr should be
provided.
These should be provided by any conformant C library
(not by the POSIX API).
Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
diff --git a/lib/posix/options/Kconfig.device_io b/lib/posix/options/Kconfig.device_io
index 9cfbd45..0999a44 100644
--- a/lib/posix/options/Kconfig.device_io
+++ b/lib/posix/options/Kconfig.device_io
@@ -8,6 +8,7 @@
bool "POSIX device I/O [EXPERIMENTAL]"
select FDTABLE
select EXPERIMENTAL
+ select REQUIRES_FULL_LIBC
help
Select 'y' here and Zephyr will provide an implementation of the POSIX_DEVICE_IO Option
Group such as FD_CLR(), FD_ISSET(), FD_SET(), FD_ZERO(), close(), fdopen(), fileno(), open(),
