Question

I’m debugging a core dump of my program (post-mortem) inside gdb. I opened it with:
gdb [program_name] [core_name]

However when I attempt to inspect a STL vector, e.g.
print vec->size()
or
print vec->at(0)

I get the error

“You can’t do that without a process to debug”

I’m just trying to inspect the contents and sizes of these containers. Is there any way to attach a dummy process to a core-dump gdb inspection so I can do this?

Answer 1

print the vector:

(gdb) print *vec

Then familiarize yourself with the internals of your implementation’s vector and print the raw buffer. Often called “_M_buffer” or something like that. Depending on how yours is done there may be an internal object that the buffer is inside of.