[PATCH 3/4] libstdc++: Avoid '-Wunused-parameter' for 'is_directory' in member function 'bool std::filesystem::__cxx11::_Dir::do_unlink(bool, std::error_code&) const'

[Thomas Schwinge]

In a newlib configuration:

    ../../../../../source-gcc/libstdc++-v3/src/c++17/fs_dir.cc: In member 
function ‘bool std::filesystem::__cxx11::_Dir::do_unlink(bool, 
std::error_code&) const’:
    ../../../../../source-gcc/libstdc++-v3/src/c++17/fs_dir.cc:147:18: error: 
unused parameter ‘is_directory’ [-Werror=unused-parameter]
      147 |   do_unlink(bool is_directory, error_code& ec) const noexcept
          |             ~~~~~^~~~~~~~~~~~

        libstdc++-v3/
        * src/c++17/fs_dir.cc (do_unlink): Tag 'is_directory' as
        '[[maybe_unused]]'.
---
 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 cd75e0541d3..9347a8a46dc 100644
--- a/libstdc++-v3/src/c++17/fs_dir.cc
+++ b/libstdc++-v3/src/c++17/fs_dir.cc
@@ -144,7 +144,7 @@ struct fs::_Dir : _Dir_base
   }
 
   bool
-  do_unlink(bool is_directory, error_code& ec) const noexcept
+  do_unlink([[maybe_unused]] bool is_directory, error_code& ec) const noexcept
   {
 #if _GLIBCXX_HAVE_UNLINKAT
     const auto atp = current();
-- 
2.34.1