libstdc++: Avoid warnings in tests

This fixes some warnings emitted when testing with warning flags added.
Some of these are only necessary when testing with -Wsystem-headers, but
either way it cleans up the tests to be less noisy under non-default
flags.

libstdc++-v3/ChangeLog:

	* testsuite/18_support/96817.cc: Avoid -Wunused warnings.
	* testsuite/20_util/any/assign/2.cc: Likewise.
	* testsuite/20_util/any/cons/2.cc: Likewise.
	* testsuite/20_util/align/1.cc: Avoid -Wsign-compare warning.
	* testsuite/20_util/function/65760.cc: Avoid -Wunused warning.
	* testsuite/20_util/function/1.cc: Avoid -Wcatch-value warning.
	* testsuite/20_util/function/cons/move_target.cc: Avoid -Wunused
	warning.
	* testsuite/20_util/headers/memory/synopsis.cc: Add exception
	specification.
	* testsuite/20_util/monotonic_buffer_resource/allocate.cc: Avoid
	-Wsign-compare warning.
	* testsuite/20_util/tuple/cons/deduction.cc: Avoid -Wunused
	warning.
	* testsuite/20_util/specialized_algorithms/uninitialized_copy/808590-cxx11.cc:
	Avoid -Wdeprecated-copy warning.
	* testsuite/21_strings/basic_string/56166.cc: Avoid
	-Wcatch-value warning.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stod.cc:
	Avoid -Wcatch-value warnings.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stof.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoi.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stol.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoll.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoul.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoull.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stod.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stof.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoi.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stol.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stold.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoll.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoul.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoull.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/char/nonnull.cc:
	Prune additional diagnostics.
	* testsuite/21_strings/basic_string_view/operations/find/char/nonnull.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/char/nonnull.cc:
	Likewise.
	* testsuite/21_strings/headers/string/synopsis.cc: Add exception
	specifications.
	* testsuite/22_locale/locale/cons/12352.cc: Define sized
	delete operators to avoid warnings.
	* testsuite/23_containers/deque/modifiers/swap/1.cc: Add
	exception specification.
	* testsuite/23_containers/forward_list/cons/11.cc: Avoid
	-Wdeprecated-copy warning.
	* testsuite/23_containers/headers/bitset/synopsis.cc: Add
	exception specification.
	* testsuite/23_containers/headers/deque/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/forward_list/synopsis.cc:
	Likewise.
	* testsuite/23_containers/headers/list/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/map/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/queue/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/set/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/vector/synopsis.cc: Likewise.
	* testsuite/23_containers/list/modifiers/swap/1.cc: Likewise.
	* testsuite/23_containers/map/modifiers/swap/1.cc: Likewise.
	* testsuite/23_containers/multimap/modifiers/swap/1.cc:
	Likewise.
	* testsuite/23_containers/multiset/modifiers/swap/1.cc:
	Likewise.
	* testsuite/23_containers/set/modifiers/swap/1.cc: Likewise.
	* testsuite/23_containers/unordered_set/56267-2.cc: Avoid
	-Wdeprecated-copy warning.
	* testsuite/23_containers/vector/bool/23632.cc: Avoid
	-Wempty-body warning.
	* testsuite/23_containers/vector/modifiers/swap/1.cc: Add
	exception specification.
	* testsuite/25_algorithms/heap/moveable2.cc: Fix misplaced
	parentheses around arguments.
	* testsuite/25_algorithms/sample/1.cc: Use return value.
	* testsuite/25_algorithms/search/searcher.cc: Avoid -Wunused
	warnings.
	* testsuite/27_io/basic_ostream/exceptions/char/9561.cc:
	Likewise.
	* testsuite/27_io/basic_ostream/exceptions/wchar_t/9561.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Avoid
	-Wsign-compare warning.
	* testsuite/experimental/any/assign/2.cc: Avoid -Wunused warnings.
	* testsuite/experimental/any/cons/2.cc: Likewise.
	* testsuite/experimental/filesystem/operations/remove_all.cc:
	Avoid -Wign-compare warning.
	* testsuite/experimental/memory/observer_ptr/cons/cons.cc:
	Likewise.
	* testsuite/experimental/memory_resource/null_memory_resource.cc:
	Likewise.
	* testsuite/experimental/source_location/1.cc: Avoid -Waddress
	warning.
	* testsuite/ext/pod_char_traits.cc: Avoid -Wunused warning.
	* testsuite/ext/vstring/modifiers/clear/56166.cc: Avoid
	-Wcatch-value.
	* testsuite/std/concepts/concepts.lang/concept.swappable/swap.cc:
	Avoid -Wunused warning.
	* testsuite/std/concepts/concepts.lang/concept.swappable/swappable.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc:
	Prune additional warnings.
	* testsuite/tr1/3_function_objects/function/1.cc: Avoid
	-Wcatch-value warning.
	* testsuite/util/replacement_memory_operators.h: Define sized
	delete to avoid warnings.
	* testsuite/util/testsuite_api.h (_NonDefaultConstructible): Add
	user-declared assignment operator to stop -Wdeprecated-copy
	warnings.
	* testsuite/util/testsuite_containers.h: Avoid -Wunused warning.
	* testsuite/util/testsuite_iterators.h: Avoid -Wsign-compare
	warnings.
	* testsuite/util/testsuite_new_operators.h: Define sized deleted.

6 files changed, 13 insertions, 13 deletions

diff --git a/libstdc++-v3/testsuite/experimental/any/assign/2.cc b/libstdc++-v3/testsuite/experimental/any/assign/2.cc
index e38455b..c2d7fec 100644
--- a/libstdc++-v3/testsuite/experimental/any/assign/2.cc
+++ b/libstdc++-v3/testsuite/experimental/any/assign/2.cc
@@ -31,14 +31,14 @@ struct X
 {
   X() = default;
   X(const X&) { copied = true; }
-  X(X&& x) { moved = true; }
+  X(X&&) { moved = true; }
 };
 
 struct X2
 {
   X2() = default;
   X2(const X2&) { copied = true; }
-  X2(X2&& x) noexcept { moved = true; }
+  X2(X2&&) noexcept { moved = true; }
 };
 
 void test01()
diff --git a/libstdc++-v3/testsuite/experimental/any/cons/2.cc b/libstdc++-v3/testsuite/experimental/any/cons/2.cc
index d6af447..d6241ae 100644
--- a/libstdc++-v3/testsuite/experimental/any/cons/2.cc
+++ b/libstdc++-v3/testsuite/experimental/any/cons/2.cc
@@ -30,14 +30,14 @@ struct X
 {
   X() = default;
   X(const X&) { copied = true; }
-  X(X&& x) { moved = true; }
+  X(X&&) { moved = true; }
 };
 
 struct X2
 {
   X2() = default;
   X2(const X2&) { copied = true; }
-  X2(X2&& x) noexcept { moved = true; }
+  X2(X2&&) noexcept { moved = true; }
 };
 
 void test01()
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/operations/remove_all.cc b/libstdc++-v3/testsuite/experimental/filesystem/operations/remove_all.cc
index 0e2aeda..c346a95 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/operations/remove_all.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/operations/remove_all.cc
@@ -124,7 +124,7 @@ test04()
   // remove write permission on the directory:
   fs::permissions(dir, fs::perms::owner_read|fs::perms::owner_exec);
   n = fs::remove_all(dir, ec);
-  VERIFY( n == -1 );
+  VERIFY( n == std::uintmax_t(-1) );
   VERIFY( ec == std::errc::permission_denied ); // not ENOTEMPTY
 
   try {
diff --git a/libstdc++-v3/testsuite/experimental/memory/observer_ptr/cons/cons.cc b/libstdc++-v3/testsuite/experimental/memory/observer_ptr/cons/cons.cc
index 4b29da2..3d6bb41 100644
--- a/libstdc++-v3/testsuite/experimental/memory/observer_ptr/cons/cons.cc
+++ b/libstdc++-v3/testsuite/experimental/memory/observer_ptr/cons/cons.cc
@@ -44,7 +44,6 @@ void test02()
 
 void test03()
 {
-  int x{};
   observer_ptr<int> a;
   observer_ptr<const int> b{a};
   VERIFY(a == b);
diff --git a/libstdc++-v3/testsuite/experimental/memory_resource/null_memory_resource.cc b/libstdc++-v3/testsuite/experimental/memory_resource/null_memory_resource.cc
index 01d4a94..284b428 100644
--- a/libstdc++-v3/testsuite/experimental/memory_resource/null_memory_resource.cc
+++ b/libstdc++-v3/testsuite/experimental/memory_resource/null_memory_resource.cc
@@ -31,7 +31,7 @@ test06()
   memory_resource* r = null_memory_resource();
   bool caught = false;
 
-  void* p = nullptr;
+  void* p __attribute__((unused)) = nullptr;
   try {
     p = r->allocate(1);
   } catch (const std::bad_alloc&) {
diff --git a/libstdc++-v3/testsuite/experimental/source_location/1.cc b/libstdc++-v3/testsuite/experimental/source_location/1.cc
index 9f5a00d..5ca5b3a 100644
--- a/libstdc++-v3/testsuite/experimental/source_location/1.cc
+++ b/libstdc++-v3/testsuite/experimental/source_location/1.cc
@@ -17,6 +17,7 @@
 
 // { dg-do run { target c++14 } }
 // { dg-require-cstdint "" }
+// { dg-options "-Wno-address" }
 
 #include <experimental/source_location>
 #include <experimental/string_view>
@@ -29,7 +30,7 @@ void
 test01()
 {
   constexpr source_location loc = source_location::current();
-  static_assert( loc.line() == 31 );
+  static_assert( loc.line() == 32 );
   // static_assert( loc.column() == 35 );
   VERIFY( loc.file_name() == __FILE__ );
   VERIFY( loc.function_name() == string_view(__FUNCTION__) );
@@ -51,13 +52,13 @@ struct S {
 void test02()
 {
   S s0;
-  VERIFY( s0.loc.line() == 53 );
+  VERIFY( s0.loc.line() == 54 );
   // static_assert( s0.loc.column() == 7 );
   VERIFY( s0.loc.file_name() == __FILE__ );
   VERIFY( s0.loc.function_name() == string_view(__FUNCTION__) );
 
   S s1(1);
-  VERIFY( s1.loc.line() == 47 );
+  VERIFY( s1.loc.line() == 48 );
   VERIFY( s1.loc.file_name() == __FILE__ );
   VERIFY( s1.loc.function_name() == s1.func );
 }
@@ -75,21 +76,21 @@ source_location g(string_view& func) {
 void test03()
 {
   auto loc = f(); // f's first argument corresponds to this line of code
-  VERIFY( loc.line() == 77 );
+  VERIFY( loc.line() == 78 );
   // static_assert( loc.column() == 16 );
   VERIFY( loc.file_name() == __FILE__ );
   VERIFY( loc.function_name() == string_view(__FUNCTION__) );
 
   source_location c = source_location::current();
   loc = f(c); // f's first argument gets the same values as c, above
-  VERIFY( loc.line() == 83 );
+  VERIFY( loc.line() == 84 );
   // static_assert( loc.column() == 23 );
   VERIFY( loc.file_name() == __FILE__ );
   VERIFY( loc.function_name() == string_view(__FUNCTION__) );
 
   string_view func;
   loc = g(func);
-  VERIFY( loc.line() == 70 );
+  VERIFY( loc.line() == 71 );
   // static_assert( loc.column() == 23 );
   VERIFY( loc.file_name() == __FILE__ );
   VERIFY( loc.function_name() == func );