How come I get no compile errors in Nios eclipse application?

Hi all,

I managed to get a nios (gen 2) system done in qsys and then use the eclipse tool (from within quartus II web v15) to make a bsp file and an application c file. The project which just turns on an led in the BeMicro MAX10 works but I was surprised to see no compile errors even if I make one. I commented out the return statement for main() and it didn't complain about it when I click build all or build project. I added more errors and nothing. Is this normal? do errors have to be turned on?

Thanks