https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106308
Bug ID: 106308
Summary: Consider using statx(2) for std::filesystem
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
Target: *-*-linux*
We don't need all the info that stat(2) provides.
Whenever we want to create a filesystem::file_status we only need st_mode. This
would speed up many operations that use filesystem::file_status or
filesystem::file_type.
filesystem::file_size only uses st_mode and st_size
filesystem::read_symlink only uses st_mode and st_size
filesystem::copy and filesystem::copy_file only use st_mode, st_dev, st_ino,
and st_size.
filesystem::equivalent only uses st_mode, st_dev, st_ino.
filesystem::last_write_time only uses st_mtim.
We never care about atim, ctim, uid, nlink, rdev, blocks, or blksize (although
maybe we should use blksize for filesystem::copy_file). Fetching those fields
for files on remote filesystems is wasteful.
