Index: libcxx/utils/libcxx/test/params.py
===================================================================
--- libcxx/utils/libcxx/test/params.py
+++ libcxx/utils/libcxx/test/params.py
@@ -37,6 +37,19 @@
   '-Wno-unused-local-typedef',
 ]
 
+_allFreestandingActions = [
+  AddFeature('libcpp-any-freestanding'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE'), AddFeature('libcpp-has-no-global-filesystem-namespace'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_MONOTONIC_CLOCK'), AddFeature('libcpp-has-no-monotonic-clock'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_STDIN'), AddFeature('libcpp-has-no-stdin'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_STDOUT'), AddFeature('libcpp-has-no-stdout'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS'), AddFeature('libcpp-has-no-thread-unsafe-c-functions'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_THREADS'), AddFeature('libcpp-has-no-threads'),
+  AddCompileFlag('-D_LIBCPP_NO_VCRUNTIME'), AddFeature('libcpp-no-vcruntime'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_RANDOM_DEVICE'), AddFeature('libcpp-has-no-random-device'),
+  AddCompileFlag('-D_LIBCPP_HAS_NO_LOCALIZATION'), AddFeature('libcpp-has-no-localization'),
+]
+
 DEFAULT_PARAMETERS = [
   # Core parameters of the test suite
   Parameter(name='std', choices=_allStandards, type=str,
@@ -110,4 +123,7 @@
             actions=lambda enabled: [] if enabled else [
               AddFeature('libcxx-no-debug-mode')
             ]),
+  Parameter(name='freestanding', choices=[True, False], type=bool, default=False,
+            help="Whether to disable tests only supported on hosted platforms.",
+            actions=lambda enabled: [] if not enabled else _allFreestandingActions),
 ]