Re: gdb 8.x - g++ 7.x compatibility
Tom Tromey <[email protected]>
| Newsgroups | gmane.comp.gdb.devel,gmane.comp.gcc.devel |
|---|---|
| Message-ID | <[email protected]> |
>>>>> "Dan" == Daniel Berlin <[email protected]> writes: Dan> If there are multiple types named Foo<2u>, DWARF needs to be extended to Dan> allow a pointer from the vtable debug info to the class type debug info Dan> (unless they already added one). This is what we did for Rust. Rust doesn't have a stable ABI yet, so using gdb's current approach -- having the debugger use details of the ABI in addition to the debug info -- wasn't an option. So, instead, the Rust compiler emits DWARF for the vtable and associates the vtable with the concrete type for which it was emitted. This required a minor DWARF extension. I think C++ could probably do something along these lines as well. The current gdb approach hasn't been really solid since function-local classes were added to C++. IIRC there are bugs in gdb bugzilla about this. These kinds of problems are, I think, completely avoided by a DWARF-based approach. Tom