libstdc++: Do not optimize away storing pathname if it's needed

libstdc++-v3/ChangeLog:

	* src/c++17/fs_dir.cc (_Dir::_Dir) [!_GLIBCXX_HAVE_OPENAT]:
	Always store pathname if we don't have openat or unlinkat,
	because the full path is needed to open sub-directories and
	remove entries.

(cherry picked from commit 835b19936bf30d693783bfa39145a4ce243bbd7c)

diff --git a/libstdc++-v3/src/c++17/fs_dir.cc b/libstdc++-v3/src/c++17/fs_dir.cc
index a7a22a7134c45fc02f1e40d7360c065ce1d1e4a9..39d12ec130a9f77172931b08617fb4fe713a2097 100644 (file)
--- a/libstdc++-v3/src/c++17/fs_dir.cc
+++ b/libstdc++-v3/src/c++17/fs_dir.cc
@@ -48,7 +48,7 @@ struct fs::_Dir : _Dir_base
        [[maybe_unused]] bool filename_only, error_code& ec)
   : _Dir_base(fdcwd(), p.c_str(), skip_permission_denied, nofollow, ec)
   {
-#if _GLIBCXX_HAVE_DIRFD
+#if _GLIBCXX_HAVE_DIRFD && _GLIBCXX_HAVE_OPENAT && _GLIBCXX_HAVE_UNLINKAT
     if (filename_only)
       return; // Do not store path p when we aren't going to use it.
 #endif