tools/perf/arch/x86/Makefile - linux - Git at Google

 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
 endif
 ifndef NO_LIBUNWIND
 LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind.o
 endif
 LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/header.o
	ifndef NO_DWARF
	PERF_HAVE_DWARF_REGS := 1
	LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
	endif
	ifndef NO_LIBUNWIND
	LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind.o
	endif
	LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/header.o