[committed] libstdc++: Disable tests for targets without symlink support

[Jonathan Wakely]

These tests for filesystem::copy_symlink should be disabled on targets
that don't support symlinks (or where the target does, but our
std::filesystem doesn't, such as mingw-w64).

libstdc++-v3/ChangeLog:

        * testsuite/27_io/filesystem/operations/copy_symlink/1.cc: Add
        dg-require-target-fs-symlinks.
        * testsuite/27_io/filesystem/operations/copy_symlink/2.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/copy_symlink/3.cc:
        Likewise.
        * testsuite/27_io/filesystem/operations/copy_symlink/4.cc:
        Likewise.
---

Tested x86_64-linux. Pushed to trunk.

 .../testsuite/27_io/filesystem/operations/copy_symlink/1.cc      | 1 +
 .../testsuite/27_io/filesystem/operations/copy_symlink/2.cc      | 1 +
 .../testsuite/27_io/filesystem/operations/copy_symlink/3.cc      | 1 +
 .../testsuite/27_io/filesystem/operations/copy_symlink/4.cc      | 1 +
 4 files changed, 4 insertions(+)

diff --git 
a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/1.cc 
b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/1.cc
index e04b2672e6dd..fbb2e66c440d 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/1.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/1.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++17 } }
 // { dg-require-filesystem-ts "" }
+// { dg-require-target-fs-symlinks "" }
 
 #include <filesystem>
 #include <testsuite_hooks.h>
diff --git 
a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/2.cc 
b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/2.cc
index 27caf4a1d4a0..6200fcb0b577 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/2.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/2.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++17 } }
 // { dg-require-filesystem-ts "" }
+// { dg-require-target-fs-symlinks "" }
 
 #include <filesystem>
 #include <testsuite_hooks.h>
diff --git 
a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/3.cc 
b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/3.cc
index 13e9dad20fcb..bf4049591ae1 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/3.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/3.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++17 } }
 // { dg-require-filesystem-ts "" }
+// { dg-require-target-fs-symlinks "" }
 
 #include <filesystem>
 #include <testsuite_hooks.h>
diff --git 
a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/4.cc 
b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/4.cc
index 2e4f300194ba..64f15f762974 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/4.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/operations/copy_symlink/4.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++17 } }
 // { dg-require-filesystem-ts "" }
+// { dg-require-target-fs-symlinks "" }
 
 #include <filesystem>
 #include <testsuite_hooks.h>
-- 
2.54.0