nelhage added a comment. Compiling my test program with g++ and looking at `llvm-dwarfdump -all`, I can see no reference to the ABI tag other than in the `DW_AT_linkage_name`. Skimming the gdb source, I see references to it knowing how to *demangle* ABI tags, but no references in the DWARF code or otherwise in the expression-handler. I strongly suspect that GDB implements essentially this solution, using `DW_AT_linkage_name` to populate linkage names in its symbol table, and uses its C++ demangler to find ABI tags for display purposes.
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