[Bug libstdc++/96484] Horrible performance of std::read_symlink

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96484

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:f86f80dbccece356fa5ca7e1fd4dc581cc6a1cc4

commit r9-8787-gf86f80dbccece356fa5ca7e1fd4dc581cc6a1cc4
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Aug 6 18:44:50 2020 +0100

    libstdc++: Fix unnecessary allocations in read_symlink [PR 96484]

    libstdc++-v3/ChangeLog:

            PR libstdc++/96484
            * src/c++17/fs_ops.cc (fs::read_symlink): Return an error
            immediately for non-symlinks.
            * src/filesystem/ops.cc (fs::read_symlink): Likewise.

    (cherry picked from commit 6a13a4e3f29fc4ce5eff96d74ba965c9fdc02184)