Why can't I print out stack information

[zuowanbushiwo]

like this：
Stack trace (most recent call last):
#1 Object "/lib/libc.so.6", at 0xf6f499bf, in __default_rt_sa_restorer_v1
#0 | Source "backward.hpp", line 2254, in backward::SignalHandling::sig_handler(int, siginfo_t*, void*)
| Source "backward.hpp", line 2232, in backward::SignalHandling::handleSignal(int, siginfo_t*, void*)
Source "backward.hpp", line 710, in backward::StackTraceImplbackward::system_tag::linux_tag::load_from(void*, unsigned int) [0x17183]

Which line in my source file is not located? I have follow define：
#define BACKWARD_HAS_BFD 1
#define BACKWARD_HAS_UNWIND == 1

thanks！

[dtsmith2001]

@zuowanbushiwo your second define is not formatted properly. Also, you must link with libbfd using -lbfd and supply the library location using -L/path/to/libbfd.so.

[zuowanbushiwo]

thanks！