I run into trouble using GDB 7 (7.3) on MacOS Lion.
What I did was:
$ sudo port install gdb
After that GDB was installed to: /opt/loca
On Maverick follow this instructions that use homebrew. It seems that Apple's new system makes it hard to use gdb... http://ntraft.com/installing-gdb-on-os-x-mavericks/
Try cgdb for now, it's actually pretty nice so far:
sudo port install cgdb
I don't claim to understand why the latest gdb sources have an issue on the mac, but I have the same issue as you and I tried cgdb and it works for me. Links for more information: