Parallel buld issues and missing output when building certain objects

The tools build system can only handle one object when building and because we build in parallel multiple the %-in.o rules that in turns starts multiple builds for test.o and cla.o leading to occasional build failures when parallel builds are used. 

Also it looks like there is not output when building certain objects (e.g. tests/cla.o) with both verbose and non-verbose.
