[Dwarf-Discuss] Producing .debug_names and questions about this lookup format

Jan Kratochvil jan at jankratochvil.net
Tue Feb 1 23:49:56 PST 2022


On Wed, 02 Feb 2022 01:08:27 +0100, David Blaikie via Dwarf-Discuss wrote:
> Clang does (if you pass -gpubnames in addition to -gdwarf-5). Looks like it
> only uses DW_FORM_ref4 as though they were absolute (not unit-relative)
> offsets. Looks like @Pavel Labath <pavel at labath.sk> added this DWARFv5
> .debug_names support in https://reviews.llvm.org/D43286
> 
> Ah, looks like the implementation only adds IDX_compile_unit if there's
> more than one unit being produced:
> https://github.com/llvm/llvm-project/blob/d7dd7ad827a0a78314f3c9b55f4778a6059840f3/llvm/lib/CodeGen/AsmPrinter/AccelTable.cpp#L410

If not obvious that means one needs to use -gdwarf-5 -gpubnames -flto.
Otherwise each CU/TU has its own single-CU/TU .debug_names index.


Jan


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