libstdc++: Fix -Wunused-variable warning for -fno-exceptions build

If _GLIBCXX_THROW_OR_ABORT expands to just __builtin_abort() then the
bool variable used in the filesystem_error constructor is unused. Mark
it as maybe_unused to there's no warning for -fno-exceptions builds.

libstdc++-v3/ChangeLog:

	* src/c++17/fs_dir.cc (fs::recursive_directory_iterator::pop):
	Add [[maybe_unused]] attribute.
	* src/filesystem/dir.cc (fs::recursive_directory_iterator::pop):
	Likewise.

diff --git a/libstdc++-v3/src/c++17/fs_dir.cc b/libstdc++-v3/src/c++17/fs_dir.cc
index 149a8b0740cf82d8092c2cd25f9a6d93a9dbc65b..a77aabb6dcced367bb9aacc8f1e9f0ece583b545 100644 (file)
--- a/libstdc++-v3/src/c++17/fs_dir.cc
+++ b/libstdc++-v3/src/c++17/fs_dir.cc
@@ -347,7 +347,7 @@ fs::recursive_directory_iterator::pop(error_code& ec)
 void
 fs::recursive_directory_iterator::pop()
 {
-  const bool dereferenceable = _M_dirs != nullptr;
+  [[maybe_unused]] const bool dereferenceable = _M_dirs != nullptr;
   error_code ec;
   pop(ec);
   if (ec)

diff --git a/libstdc++-v3/src/filesystem/dir.cc b/libstdc++-v3/src/filesystem/dir.cc
index ac9e70da5168f620a95be71090c30601e6841553..7cf8e62b5e676259a6ff24f28b1a572dc1a0bbea 100644 (file)
--- a/libstdc++-v3/src/filesystem/dir.cc
+++ b/libstdc++-v3/src/filesystem/dir.cc
@@ -334,7 +334,7 @@ fs::recursive_directory_iterator::pop(error_code& ec)
 void
 fs::recursive_directory_iterator::pop()
 {
-  const bool dereferenceable = _M_dirs != nullptr;
+  [[maybe_unused]] const bool dereferenceable = _M_dirs != nullptr;
   error_code ec;
   pop(ec);
   if (ec)