[PATCH] libstdc++-v3: check for openat

[Jonathan Wakely]

On Mon, 27 Jun 2022 at 10:49, Alexandre Oliva <oliva@adacore.com> wrote:
>
> On Jun 24, 2022, Jonathan Wakely <jwakely@redhat.com> wrote:
>
> > Ah, but this patch only added the HAVE_OPENAT check to
> > src/filesystem/dir.cc not the similar code in src/c++17/fs_dir.cc
>
> Doh!  It was such a long and goof-ful day :-(
>
> Thanks for catching it.
>
> Unless you ask me not to, I'd like to install this to complete the
> earlier patch.

OK, although I'll just remove it again as part of the _At_path patch
that makes this extra check unnecessary. But this part would be a
candidate for backporting.

>  I've given it some testing, along with your _At_path
> patch, and results are looking promising.  There are still a few
> remaining fails.
>
>
> libstdc++: check for openat with dirfd in std::filesystem
>
> From: Alexandre Oliva <oliva@adacore.com>
>
> In the recent patch to check for openat, I missed an occurrence of
> dirfd in std::filesystem.
>
>
> for  libstdc++-v3/ChangeLog
>
>         * src/c++17/fs_dir.cc (dir_and_pathname): Use dirfd if
>         _GLIBCXX_HAVE_OPENAT.
> ---
>  libstdc++-v3/src/c++17/fs_dir.cc |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libstdc++-v3/src/c++17/fs_dir.cc b/libstdc++-v3/src/c++17/fs_dir.cc
> index c67fe76bc14f8..25b33baa875fb 100644
> --- a/libstdc++-v3/src/c++17/fs_dir.cc
> +++ b/libstdc++-v3/src/c++17/fs_dir.cc
> @@ -124,7 +124,7 @@ struct fs::_Dir : _Dir_base
>    dir_and_pathname() const noexcept
>    {
>      const fs::path& p = entry.path();
> -#if _GLIBCXX_HAVE_DIRFD
> +#if _GLIBCXX_HAVE_DIRFD && _GLIBCXX_HAVE_OPENAT
>      if (!p.empty())
>        return {::dirfd(this->dirp), std::prev(p.end())->c_str()};
>  #endif
>
>
> --
> Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
>    Free Software Activist                       GNU Toolchain Engineer
> Disinformation flourishes because many people care deeply about injustice
> but very few check the facts.  Ask me about <https://stallmansupport.org>
>