Den ons. 4. dec. 2019 kl. 22.43 skrev Jonathan Wakely <jwak...@redhat.com>: > > On 03/12/19 23:38 +0100, Paul M. Bendixen wrote: > >Hello > >I've made an implementation of P0829 and tested it with gcc for avr. > > This is great, thanks! > > What's the status of libstdc++ for AVR? If I understand correctly, it > doesn't build by default when GCC is configured for AVR. Are you > overriding that, or just copying the headers somewhere and including > them in your programs? > The status is that it isn't built by default for AVR. I use the method described in "Real time C++" by Christopher Kormanyos and modified it a bit.
I have a docker image that is built as part of CI at https://gitlab.com/avr-libstdcxx/avr-libstdcxx-docker that describes the build process. I use avrlibc instead of newlib and it seems to work well. > >I've included the patch and I believe it might need some modification. > >Should I rather just maintain my own fork until P0829 is a bit > >further? (It is currently being split into smaller proposals). > > Yes, I think it's too early to actually make this change. Our current > !_GLIBCXX_HOSTED build conforms to the requirements of a freestanding > implementation (for anything from C++98 to C++17) so I'd prefer not to > mess with that drastically until the P0829 work has made more > progress. Despite that, I'm very happy to see somebody take on the > task, and will be glad to apply a patch like this when the time is > right. > I also considered using another macro ( such as _P0829_FREESTANDING ) so that it might be added directly. I will try to keep the branch up to date with regards to the current proposal. If anyone else is interested, the code is at: https://gitlab.com/avr-libstdcxx/ > >I have not included further tests, nor actually run the tests since > >everything is in header files is only includes of already existing > >libstdc++ code. > > If we were serious about improving our freestanding support, we'd need > to partition the testsuite into the parts that should pass for > freestanding, and mark all the other tests UNSUPPORTED. That would > mean we could run tests for a freestanding build and not get thousands > of failures for tests that are not expected to work for freestanding. > That would be a big project though. > > Your patch is mostly just adding #if in various places, not adding new > code, and so I'm not sure it needs a copyright assignment (the changes > probably aren't copyrightable anyway). But if you plan to contribute > to GCC it would be good to get an assignment in place (if you don't > have one already). See https://gcc.gnu.org/contribute.html#legal for > more information, and feel free to contact me directly if you have any > questions or if you want to start the process. > > Thanks again for the patch. Please do keep working on it as the P0829 > work evolves, so that we can integrate it with libstdc++ at some > point. > Thank you, I will -- • − − •/• −/• • −/• − • •/− • • •/•/− •/− • •/• •/− • • −/•/− •/• − − •− •/− − •/− −/• −/• •/• − • •/• − • − • −/− • − •/− − −/− −//
