1 files changed, 27 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/66855.cc b/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/66855.cc
index 3f99cb416f4..1870a3aab46 100644
--- a/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/66855.cc
+++ b/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/66855.cc
@@ -45,8 +45,35 @@ test01()
   VERIFY( buf[3] == utf16[3] );
 }
 
+void
+test02()
+{
+  // Endianness flag should make no difference.
+  std::codecvt_utf8_utf16<char16_t, 0x10ffff, std::little_endian> cvt;
+  char16_t utf16[] = u"\ub098\ub294\ud0dc\uc624";
+  const char16_t* nf16;
+  char utf8[16];
+  char* nt8;
+  std::mbstate_t st{};
+  auto res = cvt.out(st, utf16, utf16+4, nf16, utf8, utf8+16, nt8);
+  VERIFY( res == std::codecvt_base::ok );
+
+  st = {};
+  char16_t buf[4] = {};
+  const char* nf8 = nt8;
+  char16_t* nt16;
+  res = cvt.in(st, utf8, nf8, nf8, buf, buf+4, nt16);
+  VERIFY( res == std::codecvt_base::ok );
+  VERIFY( nt16 == buf+4 );
+  VERIFY( buf[0] == utf16[0] );
+  VERIFY( buf[1] == utf16[1] );
+  VERIFY( buf[2] == utf16[2] );
+  VERIFY( buf[3] == utf16[3] );
+}
+
 int
 main()
 {
   test01();
+  test02();
 }