dblaikie added a comment. In D52296#2165370 <https://reviews.llvm.org/D52296#2165370>, @Trass3r wrote:
> In D52296#1285328 <https://reviews.llvm.org/D52296#1285328>, @grimar wrote: > > > In D52296#1284130 <https://reviews.llvm.org/D52296#1284130>, @probinson > > wrote: > > > > > Only DWARF supports this, correct? > > > > > > I am not aware of any kind of debug information splitting except DWARF > > splitting. > > > Just for the record, msvc does something very similar to this > -gsplit-dwarf=single option (using a linker option /DEBUG:FASTLINK instead of > this SHF_EXCLUDE approach). > > Some questions: > > - How is this handled by dwp/llvm-dwp? I guess not yet since neither supports > DWARF5 atm. > - How does it interact with -gdwarf-5? Should it? This functionality should be pretty orthogonal to -gdwarf-5 and dwp - though it may not be currently, I haven't looked/checked. But seems to me this sort of functionality should work with pre-standard/DWARFv4 Split DWARF as well as it does with DWARFv5 Split DWARF, unless I'm missing something. And dwp tools should be made to ignore the non-.dwo-suffixed sections, but they may not be made that way currently, I haven't checked. > - There is some deeply buried information about how gdb requires > .debug_gnu_pubnames in the case of split dwarf: > https://reviews.llvm.org/D54497?id=173943#1299461. Is this still true for > this single split case? I'm asking cause these sections are huge and I wonder > if they defeat the split dwarf link time gains. I believe it still is the case, yes. Though GDB startup times are much better with an index with or without Split DWARF - so if you want an index anyway, the split (single split, or split split) might still be a good thing independent of that. If you have to tradeoff one or the other, yeah, that may be more complicated (lld, at least, last I heard, uses more memory to make gdb-index than gold does, so while lld's memory usage is less than gold's (& certainly less than bfd's) usually, with gdb-index it's a bit worse - so the tradeoffs might be more complicated depending on which linker you're using, etc) Repository: rC Clang CHANGES SINCE LAST ACTION https://reviews.llvm.org/D52296/new/ https://reviews.llvm.org/D52296 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
