On Wed, Feb 16, 2022 at 7:17 AM Casey Bodley <cbodley@xxxxxxxxxx> wrote: > > thanks Greg, > > On Tue, Feb 15, 2022 at 8:51 PM Gregory Farnum <gfarnum@xxxxxxxxxx> wrote: > > > > On Thu, Feb 10, 2022 at 8:36 AM Casey Bodley <cbodley@xxxxxxxxxx> wrote: > > > > > > the R release could be a good opportunity to make the switch to c++20 > > > > > > gcc and clang both track their support for c++20 features over > > > compiler versions in: > > > https://gcc.gnu.org/projects/cxx-status.html#cxx20 > > > https://clang.llvm.org/cxx_status.html#cxx20 > > > > > > thanks to the dev toolset in rhel/centos, we should already have > > > access to compilers that support c++20. for ubuntu, focal is still on > > > gcc-9 which doesn't understand -std=c++20 at all, but clang-10 does > > > > > > if we're willing to switch our ubuntu builds to clang, we could start > > > experimenting with c++20 on master now. otherwise, we can wait for the > > > jammy release in april > > > > Don't forget we also need to keep building for older distros. I know > > can we be more specific about this requirement? are you saying that > the R release still needs to build on ubuntu focal? or that our > octopus/pacific/quincy releases do? I was thinking we need to maintain support for Ubuntu 20.04 in our next release, yeah. But that may not be right; I guess we generally try and support the most recent LTS in our new branches. So maybe this is a non-issue? > > > it's supposed to be possible and sometimes we've managed to > > cross-build, but it always seems to be hit-or-miss on any given > > distro/compiler version. > > i'm not sure what you mean by cross-build here - is that about CI > using different distros/compilers depending on the ceph branch? I mean you can technically build for eg Focal in a Jammy compiler to get support for those new compiler features. But it's hard to maintain. -Greg > > > That would be my main concern. > > -Greg > > > > > > > > in the longer term, i'd love to take advantage of c++20's modules to > > > speed up ceph builds, but it could take another year or so before > > > cmake and the compilers support everything we need > > > > > > are there any other concerns or obstacles to making this switch? > > > > > > _______________________________________________ > > > Dev mailing list -- dev@xxxxxxx > > > To unsubscribe send an email to dev-leave@xxxxxxx > > > > > > _______________________________________________ Dev mailing list -- dev@xxxxxxx To unsubscribe send an email to dev-leave@xxxxxxx
