Eclipse C/C++ Shows Errors but Compiles?

Question

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 und

Answer 1

The solution below worked for me: Click to your project using right click. Then: Properties -> C/C++ General -> Paths and Symbols -> Symbols -> GNU C++. Almost for sure there are no symbols at all if you have this problem. Add symbol "__cplusplus" with value "201402L" After this: Right click on Project -> Index -> Rebuild You are done.