[PATCH] libstdc++: Fix -Wunused-parameter warnings

[Pekka Seppänen]

libstdc++: Fix -Wunused-parameter warnings when _GLIBCXX_USE_WCHAR_T is
not defined.
libstdc++-v3/ChangeLog:

        * src/c++11/cow-locale_init.cc: Add [[maybe_unused]] attribute.
        * src/c++17/fs_path.cc (path::_S_convert_loc): Likewise.
        * src/filesystem/path.cc (path::_S_convert_loc): Likewise.
---
 libstdc++-v3/src/c++11/cow-locale_init.cc | 4 ++--
 libstdc++-v3/src/c++17/fs_path.cc         | 2 +-
 libstdc++-v3/src/filesystem/path.cc       | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/src/c++11/cow-locale_init.cc 
b/libstdc++-v3/src/c++11/cow-locale_init.cc
index 85277763427..9554ed1ebf9 100644
--- a/libstdc++-v3/src/c++11/cow-locale_init.cc
+++ b/libstdc++-v3/src/c++11/cow-locale_init.cc
@@ -137,8 +137,8 @@ namespace
   }

   void
-  locale::_Impl::_M_init_extra(void* cloc, void* clocm,
-                               const char* __s, const char* __smon)
+  locale::_Impl::_M_init_extra(void* cloc, [[maybe_unused]] void* 
clocm,
+                              const char* __s, [[maybe_unused]] const char* 
__smon)
   {
     auto& __cloc = *static_cast<__c_locale*>(cloc);

diff --git a/libstdc++-v3/src/c++17/fs_path.cc 
b/libstdc++-v3/src/c++17/fs_path.cc
index aaea7d2725d..d65b5482e8b 100644
--- a/libstdc++-v3/src/c++17/fs_path.cc
+++ b/libstdc++-v3/src/c++17/fs_path.cc
@@ -1947,7 +1947,7 @@ path::_M_split_cmpts()

 path::string_type
 path::_S_convert_loc(const char* __first, const char* __last,
-                    const std::locale& __loc)
+                    [[maybe_unused]] const std::locale& __loc)
 {
 #if _GLIBCXX_USE_WCHAR_T
   auto& __cvt = std::use_facet<codecvt<wchar_t, char, 
mbstate_t>>(__loc);
diff --git a/libstdc++-v3/src/filesystem/path.cc 
b/libstdc++-v3/src/filesystem/path.cc
index 4c218bdae49..d04ba6d465d 100644
--- a/libstdc++-v3/src/filesystem/path.cc
+++ b/libstdc++-v3/src/filesystem/path.cc
@@ -498,7 +498,7 @@ path::_M_trim()

 path::string_type
 path::_S_convert_loc(const char* __first, const char* __last,
-                    const std::locale& __loc)
+                    [[maybe_unused]] const std::locale& __loc)
 {
 #if _GLIBCXX_USE_WCHAR_T
   auto& __cvt = std::use_facet<codecvt<wchar_t, char, 
mbstate_t>>(__loc);
--
2.34.1