Commits on Dec 17, 2021

1. rustc_codegen_llvm: Give each codegen unit a unique DWARF name on all …

   platforms, not just Apple ones.
   
   To avoid breaking split DWARF, we need to ensure that each codegen unit has a
   unique `DW_AT_name`. This is because there's a remote chance that different
   codegen units for the same module will have entirely identical DWARF entries
   for the purpose of the DWO ID, which would violate Appendix F ("Split Dwarf
   Object Files") of the DWARF 5 specification. LLVM uses the algorithm specified
   in section 7.32 "Type Signature Computation" to compute the DWO ID, which does
   not include any fields that would distinguish compilation units. So we must
   embed the codegen unit name into the `DW_AT_name`.
   
   Closes rust-lang#88521.

   

   pcwalton committed Dec 17, 2021
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