So I am building some Arduino code in eclipse, as described in Your Second Arduino Project, but every time I use an Arduino library, such as Serial, Eclipse underlines my function names, claiming they cannot be resolved. However, the code actually compiles, so I’m kind of at a loss as to why Eclipse thinks the functions are missing. If anyone has any idea on how to solve this problem it would be appreciated. Thanks beforehand.
EDIT: I should have been more specific, Eclipse underlines the METHODS inside the Arduino libraries. So if I use Serial.println("hello");, it underlines println() and claims it cannot be resolved. Then it compiles just fine and the method works when uploaded to the arduino board.
EDIT2: I found my error, turns out I was trying to use some C++ functions in a C file, and eclipse didn’t like it; I renamed to .cpp and all the red disappeared 😉 Thanks for your help!
For starters, what color is the underline? This makes a difference, as yellow means it’s a warning, and red means it’s an error (critical, will not build in most circumstances).
Second, you need to look at the “Problems” tab to see if there are actual errors. If there is nothing there, then it did indeed compile correctly.
Now, back to the original question. Depending on the type of project you are building, this type of behavior is not that uncommon. Eclipse seems to do a poor job of indexing certain projects. When you run “make all” from the command line (which is effectively what Eclipse does during build) it is likely resolving all of your code and building it just fine.
However, Eclipse uses a different, separate tool for indexing all of your source code and resolving variable/function definitions and declarations. This is literally a case of the left hand not knowing what the right hand is doing.