Wrong build in Eclipse

I'm instaling Eclipse under these tutorial https://marketplace.eclipse.org/content/arduino-eclipse-plugin-product
I'm starting new project with New Arduino sketch and then replace almost empty .ino with those from CodeBlock.
Problem is, that Eclipse builder produce wrong functioned Arduino Mega. Same .ino in CodeBlock work OK. What could be wrong, which settings to check.

Eclipse is so huge, that I'm totaly lost in space :slight_smile: :frowning:
Pleas help me. My code have more then 100kB, so I need better IDE