https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95609
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:0f7cd5e5735e5536bf7bc8ca2b998f7ce8b4ddee commit r11-4475-g0f7cd5e5735e5536bf7bc8ca2b998f7ce8b4ddee Author: Jonathan Wakely <jwak...@redhat.com> Date: Wed Oct 28 12:07:40 2020 +0000 libstdc++: Make std::span layout-compatible with struct iovec [PR 95609] This change reorders the data members of std::span so that span<byte> is layout-compatible with common implementations of struct iovec. This will allow span<byte> to be used directly in places that use a struct iovec to do scatter-gather I/O. It's important to note that POSIX doesn't specify the order of members in iovec. Also the equivalent type on Windows has members in the other order, and uses type ULONG (which is always 32-bit whereas size_t is 64-bit for Win64). So this change will only help for certain targets and an indirection between std::span and I/O system calls will still be needed for the general case. libstdc++-v3/ChangeLog: PR libstdc++/95609 * include/std/span (span): Reorder data members to match common implementations of struct iovec. * testsuite/23_containers/span/layout_compat.cc: New test.
