On Wed, 30 Sep 2020 02:11:34 +0200, Neal Gompa wrote: > Why don't you add an lldb-add-index tool to generate LLVM indexes for > LLDB?
Because doing it separately like GDB does is a wrong thing for edit-compile-debug cycle. When clang (lld for LTO) has all the data incl. IR already in memory it can much more faster produce the index for it. With gdb-add-index it is questionable whether to use it or not for edit-compile-debug cycles. If you run debugger just once for the compiled program it is slower to generate + use the index just once than to run the debugger without any index. The index production performance does not matter much for rpmbuild as that takes a long time anyway. But keeping the end-user edit-compile-debug cycle unified with rpm build process makes the code path more tested and more simple. > Then we just invoke it as part of the buildroot policy setup and > get both GDB and LLDB indexes? This proposal seems to be particularly > destructive to GDB users to favor LLDB. I do not see how this affects GDB. This Change expects clang will produce .debug_names and rpmbuild will call gdb-add-index which will add .gdb_index. Then there will be both indexes for both debuggers. That is not great longterm but in some time GDB should fix its .debug_names consumer to be compatible with the DWARF-5 standard and then Fedora can drop .gdb_index completely. (TBH I am not completely sure that LLDB conforms to the DWARF-5 standard as the standard is not too descriptive of the format. But LLDB is at least more .debug_names standard compliant despite "more compliant" may sound funny.) > I personally don't use LLDB for *anything*, since I think it's not a > particularly good debugger right now, Please do not be offensive to the other toolchain. I also must not be so it is unfair. I could argue with numbers but I won't. > performance of debugging clang-built things with GDB degraded. This is not intended/expected. Jan _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
