Exciting Features in Recent GDB Versions
Discover the latest advancements in GDB versions, including debuginfod, user-defined commands, improved backtraces, TUI enhancements, Python integration, streamlined compilation processes, ELF/DWARF insights, debuginfo separation techniques, and more. Unleash the power of debuginfod servers, federated support, better command customization, advanced backtrace options, output styling controls, new convenience variables, and symbol worker thread management.
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Presentation Transcript
Some good stuff in more recent GDB versions - - - - - - debuginfod user-defined commands better backtraces TUI + Python awesomeness compile command condition breakpoint fix
ELF, DWARF, processes and debuggers => a.out gcc -g3 hello.c process text (i.e. code) GDB data (e.g. non-zero globals) rodata (e.g. strings) symbol table debug info Source code
Separating debuginfo Either: cp a.out a.out.dbg && strip a.out Or: objcopy --only-keep-debug a.out a.out.dbg objcopy --add-gnu-debug-link=a.out.dbg a.out Or: gcc -gsplit-dwarf -g3 hello.c
debuginfod debuginfod serves debug information over HTTP (a bit like Microsoft Symbol Server) sudo apt install debuginfod debuginfod DEBUGINFOD_URLS=localhost:8002 gdb a.out
debuginfod servers https://debuginfod.elfutils.org/ Federated to Debian, OpenSUSE, CentOS debuginfod servers. Client support in GDB, Valgrind, SystemTap
Better user-defined commands define-prefix abc xyz Names can now use . character The with command | CMD | shell set may-call-functions on|off print & eval now will not call in the inferior for string args.
Better backtraces set print frame-arguments all | none | presence | scalars set print frame-info auto | location | location-and-address | short-location | source-and-location | source-line
Output styling set style enabled on|off
New convenience variables $_gdb_major $_gdb_minor $_gdb_setting $_gdb_setting_str $_shell_exitcode $_shell_exitsignal
Symbol worker threads maintenance show worker-threads Optional in v9, on by default in v10 and v11
