GNU debugger
GDB is a source-level debugger for Ada, C, C++, Objective-C, Pascal and
many other languages.  GDB can target (i.e., debug programs running on)
more than a dozen different processor architectures, and GDB itself can
run on most popular GNU/Linux, Unix and Microsoft Windows variants.

Maintainer: The OpenBSD ports mailing-list <ports@openbsd.org>

WWW: http://www.gnu.org/software/gdb/
