Using a library out of a managed library project

I created a library using the managed library project (NIOS II IDE version 5) creation option and successfully linked it to my application.

But during debugging the debugger runs into a alt_irq_entry() (SIGTRAP) during the initialization of static global variables.

What can be possibly wrong? Any hints on the configuration of the library?

Does the library have to be linked to a syslib? (Would not be very nice)

Any hints appreciated.