Vendor import of libc++ release_38 branch r260756:

https://llvm.org/svn/llvm-project/libcxx/branches/release_38@260756

test/libcxx/test/format.py

@@ -161,7 +161,7 @@ class LibcxxTestFormat(object):
                        'expected-error', 'expected-no-diagnostics']
         use_verify = self.use_verify_for_fail and \
                      any([tag in contents for tag in verify_tags])
-        extra_flags = []
+        extra_flags = ['-fsyntax-only']
         if use_verify:
             extra_flags += ['-Xclang', '-verify',
                             '-Xclang', '-verify-ignore-unexpected=note']

test/std/localization/locale.categories/category.collate/locale.collate.byname/compare.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class collate_byname

test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class ctype_byname;

test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class ctype_byname;

test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class ctype_byname;

test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class ctype_byname;

test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class ctype_byname;

test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class ctype_byname;