On Fri, 02 Oct 2020 18:11:45 +0200, Jan Kratochvil wrote: > On Wed, 30 Sep 2020 15:58:51 +0200, Stephen John Smoogen wrote: > > On Wed, 30 Sep 2020 at 09:41, Jan Kratochvil <jan.kratoch...@redhat.com> > > wrote: > > > On Wed, 30 Sep 2020 14:50:39 +0200, Mark Wielaard wrote: > > > > = What I am NOT working on > > > [...] > > > > - Any other tool, project not mentioned above or other > > > > native toolchains like golang, rust, clang/llvm or ocaml. > > > > I expect those to simply keep producing DWARF4. > > > > > > So because of a DWZ deficiency you want to keep DWARF-5 in clang disabled. > > > Despite clang supports DWARF-5 better and for a longer time than GCC. > > > > I did not take it to mean that. I took it to mean that he isn't going to > > tell other groups what to work on which a change request seems to have > > become. He instead expects them to keep doing what they are doing if they > > want versus getting forced to do what he is working on. > > Currently on files built by clang -gdwarf-5 DWZ will fail: > dwz: ./usr/lib64/libmatrix_client.so.0.3.1-0.3.1-2.fc34.x86_64.debug: > Unknown debugging section .debug_addr > > Which is fine as the file just does not get optimized. But that results in rpm > size bigger for clang-built binaries by 31.23% as -fdebug-types-section is not > used. If -fdebug-types-section was used for clang-built binaries DWZ would > fail a similar way but the size increase would be "just" by 6.78%.
I had a wrong idea. For clang -flto the option -fdebug-types-section no longer makes sense as clang produces direct DW_TAG_class references (DW_FORM_ref4). So DWZ cannot optimize clang output better, DWZ makes sense only for GCC, not clang. (A bit, DWZ can still find slightly more optimal DW_FORM_* variants than clang, I will check if it cannot be fixed in clang.) Jan _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
