CLion not highlighting clang errors

For the last couple years I have been writing embedded apps using GCC + Clion and it has been awesome. I really appreciated the nearly instant compiler errors while I was coding.

This week, I started a new embedded project that uses clang instead of GCC.

I was surprised to see that when I made an intentional error, it was not highlighted in the editor. So I compiled the code (ctrl + F9) and sure enough clang flagged the error, but Clion still won't highlight anything in my code.

Did I miss a setting somewhere?

Thanks,

   Daniel