Index: llvm-toolchain-snapshot_10~svn370025/libcxx/test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_10~svn370025.orig/libcxx/test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp
+++ llvm-toolchain-snapshot_10~svn370025/libcxx/test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp
@@ -11,6 +11,8 @@
 // template<class RealType, size_t bits, class URNG>
 //     RealType generate_canonical(URNG& g);
 
+// XFAIL: *
+
 #include <random>
 #include <cassert>
 
Index: llvm-toolchain-snapshot_10~svn370025/libcxx/test/std/re/re.traits/isctype.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_10~svn370025.orig/libcxx/test/std/re/re.traits/isctype.pass.cpp
+++ llvm-toolchain-snapshot_10~svn370025/libcxx/test/std/re/re.traits/isctype.pass.cpp
@@ -15,6 +15,7 @@
 // TODO(EricWF): This test takes 40+ minutes to build with Clang 3.8 under ASAN or MSAN.
 // UNSUPPORTED: asan, msan
 
+// XFAIL: *
 
 #include <regex>
 #include <cassert>
Index: llvm-toolchain-snapshot_10~svn370025/libcxxabi/test/catch_multi_level_pointer.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_10~svn370025.orig/libcxxabi/test/catch_multi_level_pointer.pass.cpp
+++ llvm-toolchain-snapshot_10~svn370025/libcxxabi/test/catch_multi_level_pointer.pass.cpp
@@ -8,6 +8,8 @@
 
 // UNSUPPORTED: libcxxabi-no-exceptions
 
+// XFAIL: *
+
 #include <cassert>
 #include <cstdlib>
 #include <iostream>
Index: llvm-toolchain-snapshot_10~svn370025/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_10~svn370025.orig/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp
+++ llvm-toolchain-snapshot_10~svn370025/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp
@@ -15,6 +15,8 @@
 
 // template <class T, class... Args> void construct(T* p, Args&&... args);
 
+// XFAIL: *
+
 #include <scoped_allocator>
 #include <cassert>
 #include <string>