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nios2 uses software single step, so GDB is unable to single step to the signal handler. In order to reflect this, teach can_single_step_to_signal_handler to return zero for nios2 target. gdb/testsuite: 2014-03-27 Yao Qi <yao@codesourcery.com> * lib/gdb.exp (can_single_step_to_signal_handler): Return zero if target is nios2-*-*.