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e96cc99687
Depends on: * https://github.com/llvm/llvm-project/pull/168725 When compiling with `-glldb`, we repoint the `DW_AT_type` of a DIE to be a typedef that refers to the `preferred_name`. I.e.,: ``` template <typename T> structure t7; using t7i = t7<int>; template <typename T> struct __attribute__((__preferred_name__(t7i))) t7 {}; template <typename... Ts> void f1() int main() { f1<t7i>(); } ``` would produce following (minified) DWARF: ``` DW_TAG_subprogram DW_AT_name ("_STN|f1|<t7<int> >") DW_TAG_template_type_parameter DW_AT_type (0x0000299c "t7i") ... DW_TAG_typedef DW_AT_type (0x000029a7 "t7<int>") DW_AT_name ("t7i") ``` Note how the `DW_AT_type` of the template parameter is a typedef itself (instead of the canonical type). The `DWARFTypePrinter` would take the `DW_AT_name` of this typedef when reconstructing the name of `f1`, so we would end up with a verifier failure: ``` error: Simplified template DW_AT_name could not be reconstituted: original: f1<t7<int> > reconstituted: f1<t7i> ``` Fixing this allows us to un-XFAIL the `simplified-template-names.cpp` test in `cross-project-tests`. Unfortunately this is only tested on Darwin, where LLDB tuning is the default. AFAIK, there is no other case where the template parameter type wouldn't be canonical.