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Hey folks, I'm trying to wrap my head around the implementation, purpose, and costs involved in both the GCC-extension v4 and standard v5 DW_TAG_call_site, call site parameters, addresses, etc. So picking up from some of the design discussion in https://reviews.llvm.org/D72489: Me (Blaikie): I'm not sure why AT_call_return_pc would be needed at a tail call site as the debugger must ignore it. As for emitting DW_AT_low_pc under gdb tuning, I think this might be an artifact from the original GNU implementation. Djordje: Yes, that is the GNU implementation's heri...