[imac]$ or1k-linux-gcc -static backtrace.c; qemu-or32 ./a.out  | head                                                  [utils]
backtrace.c: In function ‘trace_fcn’:
backtrace.c:5:3: warning: incompatible implicit declaration of built-in function ‘printf’ [enabled by default]
   printf("\t#%d: program counter at %08x\n", *depth, _Unwind_GetIP(ctx));
   ^
	#0: program counter at 000003e8
	#1: program counter at 00000414
	#2: program counter at 00000448
	#3: program counter at 0000047c
	#4: program counter at 000004b0
	#5: program counter at 0000ab8c
	#6: program counter at 00000000


[imac]$ or1k-linux-gcc -static backtrace.c -O; qemu-or32 ./a.out  | head                                               [utils]
backtrace.c: In function ‘trace_fcn’:
backtrace.c:5:3: warning: incompatible implicit declaration of built-in function ‘printf’ [enabled by default]
   printf("\t#%d: program counter at %08x\n", *depth, _Unwind_GetIP(ctx));
   ^
	#0: program counter at 000003ac
	#1: program counter at 0000041c
	#2: program counter at 0000041c
	#3: program counter at 0000041c
	#4: program counter at 0000041c
	#5: program counter at 0000041c
	#6: program counter at 0000041c
	#7: program counter at 0000041c
	#8: program counter at 0000041c
	#9: program counter at 0000041c