libstdc++: Fix -Wrange-loop-construct warnings in filesystem tests

Many tests do `for (const path& p : test_paths)` where test_paths is an
array of strings. To avoid -Wrange-loop-construct warnings the loop
variable should be an object, not a reference bound to a temporary.

libstdc++-v3/ChangeLog:

	* testsuite/27_io/filesystem/operations/absolute.cc: Avoid
	-Wrange-loop-construct warning.
	* testsuite/27_io/filesystem/path/append/source.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/parent_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/relative_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/itr/traversal.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/remove_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/nonmember/append.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/cmp.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/cmp_c++20.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/nonmember/hash_value.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_parent_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_relative_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_name.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_stem.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/is_relative.cc: Likewise.
	* testsuite/experimental/filesystem/operations/absolute.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/assign/copy.cc: Likewise.
	* testsuite/experimental/filesystem/path/compare/path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/construct/copy.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/extension.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/parent_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/relative_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/root_directory.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/root_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/itr/traversal.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/modifiers/remove_filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/modifiers/replace_extension.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/modifiers/replace_filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/nonmember/hash_value.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_extension.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_parent_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_relative_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_root_directory.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_root_name.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_root_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_stem.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/is_relative.cc:
	Likewise.

52 files changed, 58 insertions, 58 deletions

diff --git a/libstdc++-v3/testsuite/27_io/filesystem/operations/absolute.cc b/libstdc++-v3/testsuite/27_io/filesystem/operations/absolute.cc
index 96ccd77..712d131 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/operations/absolute.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/operations/absolute.cc
@@ -30,7 +30,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     std::error_code ec;
     path abs = absolute(p, ec);
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/append/source.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/append/source.cc
index dc73319..4468a24 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/append/source.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/append/source.cc
@@ -92,8 +92,8 @@ test02()
 void
 test03()
 {
-  for (const path& p : __gnu_test::test_paths)
-    for (const path& q : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
+    for (const path q : __gnu_test::test_paths)
     {
       test(p, q.c_str());
       if constexpr (!std::is_same_v<path::value_type, char>)
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/assign/copy.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/assign/copy.cc
index 0f912a5..c0fd2aa 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/assign/copy.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/assign/copy.cc
@@ -28,7 +28,7 @@ using __gnu_test::compare_paths;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy;
     copy = p;
@@ -39,7 +39,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy = p;
     path move;
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/compare/path.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/compare/path.cc
index 6f4166b..fd310fb 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/compare/path.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/compare/path.cc
@@ -30,7 +30,7 @@ void
 test01()
 {
   const path p0 = "/a/a/b/b";
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.compare(p) == 0 );
     int cmp = p.compare(p0);
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/construct/copy.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/construct/copy.cc
index 54b3510..a61c7c4 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/construct/copy.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/construct/copy.cc
@@ -28,7 +28,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy = p;
     __gnu_test::compare_paths(p, copy);
@@ -38,7 +38,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy = p;
     path move = std::move(copy);
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/extension.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/extension.cc
index 032af98..9498970 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/extension.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/extension.cc
@@ -51,7 +51,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     auto stem = p.stem();
     auto ext = p.extension();
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/filename.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/filename.cc
index 52dc3899..2ab6014 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/filename.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/filename.cc
@@ -46,7 +46,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path f = p.filename();
     if (p.empty())
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/parent_path.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/parent_path.cc
index cf37240..f198a4c 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/parent_path.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/parent_path.cc
@@ -46,7 +46,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     if (p.begin() == p.end())
       continue;
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/relative_path.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/relative_path.cc
index 3d14829..d514951 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/relative_path.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/relative_path.cc
@@ -42,7 +42,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     bool after_root = false;
     const path prel = p.relative_path();
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_directory.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_directory.cc
index b89dd47..6e24cc8 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_directory.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_directory.cc
@@ -46,7 +46,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path rootdir = p.root_directory();
     VERIFY( !rootdir.has_relative_path() );
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_path.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_path.cc
index 10ed314..aa0516f 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_path.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/decompose/root_path.cc
@@ -38,7 +38,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path rootp = p.root_path();
     path rootn = p.root_name();
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/itr/traversal.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/itr/traversal.cc
index 43cb43b..b65f997 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/itr/traversal.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/itr/traversal.cc
@@ -108,7 +108,7 @@ test02()
   using reverse_iterator = std::reverse_iterator<path::iterator>;
   std::vector<path> fwd, rev;
 
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     const auto begin = p.begin(), end = p.end();
     fwd.assign(begin, end);
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/remove_filename.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/remove_filename.cc
index f47227a..7848abd 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/remove_filename.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/remove_filename.cc
@@ -40,7 +40,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path p2(p);
     p2.remove_filename();
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_extension.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_extension.cc
index a7b61f0..6cb2300 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_extension.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_extension.cc
@@ -47,7 +47,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path p2 = p;
     compare_paths( p2.replace_extension(p2.extension()), p );
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_filename.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_filename.cc
index 48572ac..c8e39e2 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_filename.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/modifiers/replace_filename.cc
@@ -38,7 +38,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path p2(p);
     p2.replace_filename(p.filename());
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/append.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/append.cc
index 03da11f..b05f5f2 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/append.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/append.cc
@@ -69,8 +69,8 @@ test02()
 void
 test03()
 {
-  for (const path& p : __gnu_test::test_paths)
-    for (const path& q : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
+    for (const path q : __gnu_test::test_paths)
       test(p, q);
 }
 
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp.cc
index d9adfad..ff3741c 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp.cc
@@ -47,7 +47,7 @@ void
 test02()
 {
   const path p0 = "/a/a/b/b";
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.compare(p) == 0 );
     int cmp = p.compare(p0);
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp_c++20.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp_c++20.cc
index 34e8bf8..786634d 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp_c++20.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp_c++20.cc
@@ -53,7 +53,7 @@ void
 test02()
 {
   const path p0 = "/a/a/b/b";
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( std::is_eq(p <=> p) );
     VERIFY( (p <=> p0) == (p.compare(p0) <=> 0) );
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc
index d665bcb..0164fa1 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc
@@ -36,7 +36,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path pp = p.native();
     VERIFY( hash_value(p) == hash_value(pp) );
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_extension.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_extension.cc
index 707e7ac..201406f 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_extension.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_extension.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_extension() == !p.extension().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_filename.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_filename.cc
index b1848d7..f6287cb 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_filename.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_filename.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_filename() == !p.filename().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_parent_path.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_parent_path.cc
index 7f34be2..3013dbf 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_parent_path.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_parent_path.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_parent_path() == !p.parent_path().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_relative_path.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_relative_path.cc
index ef606b3..3d44874 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_relative_path.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_relative_path.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_relative_path() == !p.relative_path().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_directory.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_directory.cc
index 5a35ded..741b409 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_directory.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_directory.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_root_directory() == !p.root_directory().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_name.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_name.cc
index 0459873..079f9c9 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_name.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_name.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_root_name() == !p.root_name().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_path.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_path.cc
index 99c6951..19f1c8f0 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_path.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_root_path.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_root_path() == !p.root_path().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_stem.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_stem.cc
index c531899..7893baf 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_stem.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/has_stem.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_stem() == !p.stem().empty() );
   }
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/query/is_relative.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/query/is_relative.cc
index ba6fe3c..0ee4d94 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/query/is_relative.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/query/is_relative.cc
@@ -29,7 +29,7 @@ using std::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.is_relative() == !p.is_absolute() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/operations/absolute.cc b/libstdc++-v3/testsuite/experimental/filesystem/operations/absolute.cc
index 5c9627f..8b9fb73 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/operations/absolute.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/operations/absolute.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
 #if defined(__MINGW32__) || defined(__MINGW64__)
     if (p.empty())
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/assign/copy.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/assign/copy.cc
index 2f79360..09e2fd6 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/assign/copy.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/assign/copy.cc
@@ -28,7 +28,7 @@ using __gnu_test::compare_paths;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy;
     copy = p;
@@ -39,7 +39,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy = p;
     path move;
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/compare/path.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/compare/path.cc
index 5228d0a..66606f7 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/compare/path.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/compare/path.cc
@@ -31,7 +31,7 @@ void
 test01()
 {
   const path p0 = "/a/a/b/b";
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.compare(p) == 0 );
     int cmp = p.compare(p0);
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/construct/copy.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/construct/copy.cc
index f075ba6..50a00c5 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/construct/copy.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/construct/copy.cc
@@ -29,7 +29,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy = p;
     __gnu_test::compare_paths(p, copy);
@@ -39,7 +39,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path copy = p;
     path move = std::move(copy);
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/extension.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/extension.cc
index 2d0b088..0c5b5f4 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/extension.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/extension.cc
@@ -44,7 +44,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     auto stem = p.stem();
     auto ext = p.extension();
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/filename.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/filename.cc
index 066d7dc..a6a7b8d 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/filename.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/filename.cc
@@ -39,7 +39,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path f = p.filename();
     if (p.empty())
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/parent_path.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/parent_path.cc
index 3f12fad..bd3961a 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/parent_path.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/parent_path.cc
@@ -43,7 +43,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     if (p.begin() == p.end())
       continue;
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/relative_path.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/relative_path.cc
index 43b5091..14221de 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/relative_path.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/relative_path.cc
@@ -41,7 +41,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     bool after_root = false;
     const path prel = p.relative_path();
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_directory.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_directory.cc
index bbb5009..ffc4839 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_directory.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_directory.cc
@@ -43,7 +43,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path rootdir = p.root_directory();
     // If root-directory is composed of 'slash name',
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_path.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_path.cc
index dfd2cb0..7ffd526 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_path.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/decompose/root_path.cc
@@ -39,7 +39,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path rootp = p.root_path();
     path rootn = p.root_name();
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/itr/traversal.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/itr/traversal.cc
index 83ee78b..c148177 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/itr/traversal.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/itr/traversal.cc
@@ -69,7 +69,7 @@ test02()
   using reverse_iterator = std::reverse_iterator<path::iterator>;
   std::vector<path> fwd, rev;
 
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     const auto begin = p.begin(), end = p.end();
     fwd.assign(begin, end);
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/remove_filename.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/remove_filename.cc
index 0537bf4..5186c3d 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/remove_filename.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/remove_filename.cc
@@ -37,7 +37,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path p2(p);
     p2.remove_filename();
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_extension.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_extension.cc
index 5053c72..b098454 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_extension.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_extension.cc
@@ -38,7 +38,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path p2 = p;
     VERIFY(p2.replace_extension(p2.extension()) == p);
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_filename.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_filename.cc
index 1d063b6..858ecd9 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_filename.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/modifiers/replace_filename.cc
@@ -37,7 +37,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path p2(p);
     p2.replace_filename(p.filename());
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/nonmember/hash_value.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/nonmember/hash_value.cc
index 6853491..931727f 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/nonmember/hash_value.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/nonmember/hash_value.cc
@@ -37,7 +37,7 @@ test01()
 void
 test02()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     path pp = p.native();
     VERIFY( hash_value(p) == hash_value(pp) );
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_extension.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_extension.cc
index 3041e10..031bc82 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_extension.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_extension.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_extension() == !p.extension().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_filename.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_filename.cc
index 5fa4c6e..5ad1e3d 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_filename.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_filename.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_filename() == !p.filename().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_parent_path.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_parent_path.cc
index 5a16cf2..99d0b77 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_parent_path.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_parent_path.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_parent_path() == !p.parent_path().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_relative_path.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_relative_path.cc
index 8674bda..fa58a81 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_relative_path.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_relative_path.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_relative_path() == !p.relative_path().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_directory.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_directory.cc
index 262d7a4..930c9cb 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_directory.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_directory.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_root_directory() == !p.root_directory().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_name.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_name.cc
index 05cc306..951a746 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_name.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_name.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_root_name() == !p.root_name().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_path.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_path.cc
index bd77193..501fc82 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_path.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_root_path.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_root_path() == !p.root_path().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_stem.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_stem.cc
index acb70d9..103aff0 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_stem.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/has_stem.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.has_stem() == !p.stem().empty() );
   }
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/query/is_relative.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/query/is_relative.cc
index 6071400..86a60c6 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/query/is_relative.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/query/is_relative.cc
@@ -30,7 +30,7 @@ using std::experimental::filesystem::path;
 void
 test01()
 {
-  for (const path& p : __gnu_test::test_paths)
+  for (const path p : __gnu_test::test_paths)
   {
     VERIFY( p.is_relative() == !p.is_absolute() );
   }