Last Updated: August 7, 2012
+Last Updated: August 28, 2012
CONFIG_NSH_STRERRORstrerror(errno) makes more readable output but strerror() is
+ very large and will not be used unless this setting is y.
+ This setting depends upon the strerror() having been enabled with CONFIG_LIBC_STRERROR.
Last Updated: July 8, 2012
+Last Updated: August 28, 2012
CONFIG_LIBC_FLOATINGPOINT: By default, floating point
support in printf, sscanf, etc. is disabled.
+ CONFIG_LIBC_STRERROR:
+ strerror() is useful because it decodes errno values into a human readable strings.
+ But it can also require a lot of memory to store the strings.
+ If this option is selected, strerror() will still exist in the build but it will not decode error values.
+ This option should be used by other logic to decide if it should use strerror() or not.
+ For example, the NSH application will not use strerror() if this option is not selected;
+ perror() will not use strerror() is this option is not selected (see also CONFIG_NSH_STRERROR).
+ CONFIG_LIBC_STRERROR_SHORT:
+ If this option is selected, then strerror() will use a shortened string when it decodes the error.
+ Specifically, strerror() is simply use the string that is the common name for the error.
+ For example, the errno value of 2 will produce the string "No such file or directory" is CONFIG_LIBC_STRERROR_SHORT is not defined but the string "ENOENT" is CONFIG_LIBC_STRERROR_SHORT is defined.
+ CONFIG_LIBC_PERROR_STDOUT:
+ POSIX requires that perror() provide its output on stderr.
+ This option may be defined, however, to provide perror() output that is serialized with other stdout messages.
+ CONFIG_LIBC_PERROR_DEVNAME:
+ Another non-standard option is to provide perror() output to a logging device or file.
+ CONFIG_LIBC_PERROR_DEVNAME may be defined to be any write-able, character device (or file).
+