On Fri, 2020-06-05 at 23:16 +0200, Jakub Jelinek wrote: > On Fri, Jun 05, 2020 at 03:03:18PM -0600, Jeff Law wrote: > > Clang/LLVM and GCC are ABI compatible (with the known exception of the > > alignment > > issue for atomics) and one should be able to mix and match libraries > > compiled by > > one with code compiled by the other just fine. > > They are known not to be ABI compatible, see e.g. > https://bugs.llvm.org/buglist.cgi?quicksearch=42439%2C19909%2C44228%2C12207 > That is just one arch, has anyone e.g. tried gcc > make check-gcc check-c++-all RUN_ALL_COMPAT_TESTS=1 ALT_CC_UNDER_TEST=clang \ > ALT_CXX_UNDER_TEST=clang++ RUNTESTFLAGS=struct-layout-1.exp > on different architectures? > That might come up with more. > > Is e.g. C++ > struct A {}; > struct B { [[no_unique_address]] A a; double b; }; > passed by value the same between g++ 10 and latest clang++? It's a bug and should be treated as such. Given it's a c++20 feature I wouldn't consider it terribly concerning at this stage. Hell, gcc's been all over the map with this stuff varying release-to-release, particularly for the empty baseclass stuff.
Jeff _______________________________________________ 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
