GDB

Major new features include Python scripting support, reverse debugging, process record and replay, non-stop debugging, multi-architecture debugging, and multi-inferior, multi-process debugging. Further enhancements include an interface for JIT compilation, conditional tracepoints, new /r and /m modifiers for the "disassemble" command, automatic retrieval of shared library files from remote targets, support for inlined functions, support for reading of compressed debug sections, Ada task switching, and a new command to stop execution when a system call is made. Many bugs were fixed.

Support was added for native x86/Windows,
NetBSD/hppa, and Xtensa GNU/Linux. Multiple remote
target architectures are supported. Support was
added for the Decimal Floating Point extension.
Ada and C++ debugging were improved. The GDB/MI
interface was improved. Remote protocol and
gdbserver enhancements were made. Various new
commands were added.

Support for debugging the Objective-C programming
language has been integrated into GDB. A New
backtrace mechanism was added, which includes
DWARF 2 Call Frame Information. GDB's remote
protocol has been extended to include support for
hosted file I/O (where the remote target uses
GDB's file system). All of GDB's targets have been
updated to use the new internal architecture
framework. The way is now open for future GDB
releases to include cross-architecture native
debugging support. Profiling support was added.