> I saw that dwarf2out.c (generate_type_signature) does not just calculate > the complete type signature for use with DW_AT_signature, but also > outputs a DW_AT_GNU_odr_signature. The comment says: > > /* First, compute a signature for just the type name (and its > surrounding context, if any. This is stored in the type unit DIE > for link-time ODR (one-definition rule) checking. */ > > I couldn't find where in the toolchain this link-time checking is done. > Does anybody have any pointers?
It's not yet implemented. I plan to implement this checking in gold (as a supplement to the existing --detect-odr-violations flag, which is based on line number table information) at some point, but it's a low priority. -cary
