The NetBSD team of developers maintains two copies of GDB: One in the base-system with a stack of local patches. One in pkgsrc with mostly build fix patches. The base-system version of GDB (GPLv3) still relies on a set of local patches. I set a goal to reduce the local patches to bare minimum, ideally reaching no local modifications at all. Over the past month I've reimplemented debugging support for multi-threaded programs and upstreamed the support. It's interesting to note that the old support relied on GDB tracking only a single inferior process. This caused the need to reimplement the support and be agnostic to the number of traced processes. Meanwhile the upstream developers introduced new features for multi-target tracing and a lot of preexisting code broke and needed resurrection. This affected also the code kept in the GDB basesystem version. Additionally over the past 30 days, I've also developed new CPU-independent GDB features that were for a long time on a TODO list for NetBSD. After the past month NetBSD has now a decent and functional GDB support in the mainline. It's still not as featured as it could and CPU-specific handling will need a dedicated treatment. Plan for the next milestone Finish and upstream operational support of follow-fork, follow-vfork and follow-spawn events. Rewrite the gdbserver support and submit upstream.
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