https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99327
--- Comment #3 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:59ffa3e3dba5a7805585c61dd4387c5644249d52 commit r12-4071-g59ffa3e3dba5a7805585c61dd4387c5644249d52 Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue May 11 18:47:18 2021 +0100 libstdc++: Avoid unconditional use of errc::not_supported [PR 99327] The errc::not_supported constant is only defined if ENOTSUP is defined, which is not true for all targets. Many uses of errc::not_supported in the filesystem library do not actually match the intended meaning of ENOTSUP described by POSIX. They should be using ENOSYS instead (i.e. errc::function_not_supported). This change ensures that appropriate error codes are used by the filesystem library. The remaining uses of errc::not_supported are replaced with a call to a new helper function so that an alternative value will be used on targets that don't support errc::not_supported. Signed-off-by: Jonathan Wakely <jwak...@redhat.com> libstdc++-v3/ChangeLog: PR libstdc++/99327 * src/filesystem/ops-common.h (__unsupported): New function to return a suitable error code for missing functionality. (posix::off_t): New typedef. (posix::*): Set errno to ENOSYS instead of ENOTSUP for no-op fallback implementations. (do_copy_file): Replace uses of errc::not_supported. * src/c++17/fs_ops.cc (fs::copy, fs::copy_file, create_dir) (fs::create_directory, fs::create_directory_symlink) (fs::create_hard_link, fs::create_symlink, fs::current_path) (fs::equivalent, do_stat, fs::file_size, fs::hard_link_count) (fs::last_write_time, fs::permissions, fs::read_symlink): Replace uses of errc::not_supported. (fs::resize_file): Qualify off_t. * src/filesystem/ops.cc (fs::copy, fs::copy_file, create_dir) (fs::create_directory, fs::create_directory_symlink) (fs::create_hard_link, fs::create_symlink, fs::current_path) (fs::equivalent, do_stat, fs::file_size, fs::last_write_time) (fs::permissions, fs::read_symlink, fs::system_complete): Replace uses of errc::not_supported. (fs::resize_file): Qualify off_t and enable unconditionally. * testsuite/19_diagnostics/system_error/cons-1.cc: Likewise.
