Hi Jon, On Thu, Aug 22, 2024 at 9:43 AM Jonathan Corbet <cor...@lwn.net> wrote: > > Sami Tolvanen <samitolva...@google.com> writes: > > > The first 16 patches of this series add a small tool for computing > > symbol versions from DWARF, called gendwarfksyms. When passed a > > list of exported symbols and an object file, the tool generates > > an expanded type string for each symbol, and computes symbol CRCs > > similarly to genksyms. > > Potentially silly question but: how similarly? Specifically, do the two > tools generate the same CRCs for the same symbols? It seems that might > be important for users transitioning to the new DWARF world order.
Reconstructing the source-based type strings genksyms uses from DWARF wouldn't really be feasible, so the CRCs will be different. The similar part is just that we build a human-readable string from the debugging information and compute a CRC from it. If anyone is interested in switching to gendwarfksyms, they'll have to rebuild all their modules too. Sami
