If you are using Eclipse IDE for Altera NIOS II C++ firmware
development, you will probably be annoyed by the following two reported semantic
error messages when you are using IOWR() and IORD() macros from the io.h:
Function '__builtin_stwio' could not be resolved for IOWR()
functions in the C++ code.
Function '__builtin_ldwio' could not be resolved for
IORD() function in the C++ code.
Anyway, you will still be able to load and run the firmware
program in the hardware successfully and everything is working as expected.
These two error messages (builtin stwio could not be resolved and builtin ldwio could not be resolved) are however do not appear if
you convert your C++ code to C code.
But you want to write your code in C++. The question is how to remove the two reported
semantic error messages above because they are very annoying and they keep
distracting you from the actual error messages?
Simple. Go to the
Windows in main menu bar. Select
Preferences. On the left-hand column,
expand C/C++. Select Code Analysis. Scroll down a bit on the right-hand
column. Look for the option Function
cannot be resolved. Then, it is up to
you to change this setting. You can
uncheck the option for Function cannot be resolved. Or, you can just change it to Info or Warning
from the drop-down list.
Important reminder, after applying the change of the
setting, don’t forget to close the Eclipse IDE and reopen it. I noticed that without restarting the Eclipse
IDE, the new setting is not effective.
After restarting the Eclipse IDE, you will notice that the two semantic
error messages above are no longer reported as error.
