Question

I have to get the backtrace in c++ function and store it into a string as follows:

string myFunction()
{
     void *array[5002];
    // get void*'s for all entries on the stack
    size_t size = backtrace(array, 5000);
    char** trace = backtrace_symbols(array, size);
    string stackTrace;
    for(size_t index=0; index<size; ++index)
    {
         stackTrace += trace[index];
    }
 return stackTrace;
}

with above use of code i am getting memory fault.
backtrace with gdb of above error is follows

?? () from /lib64/libgcc_s.so.1
0x000000359be08934 in _Unwind_Backtrace () from /lib64/libgcc_s.so.1
0x00000035976e6358 in backtrace () from /lib64/libc.so.6
0x00002aaaab7afaec in (anonymous namespace)::myFunction() at fileName.cpp

Any sugestion to resolve this?
Thanks in Advace.

Answer 1

You need to add the -rdynamic compiler flag to gcc/g++:

g++ -rdynamic -Wall -o file.bin file.cpp