[libc++] Add proper XFAILs for shared_mutex tests

Dylib support for shared_mutex was added in macOS 10.12, so the tests
should be XFAILed accordingly instead of being completely disabled
whenever availability is enabled.

rdar://problem/48769104

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@357079 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/lit.local.cfg

@@ -1,2 +0,0 @@
-if 'availability' in config.available_features:
-    config.unsupported = True

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // FLAKY_TEST.
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // FLAKY_TEST.
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // FLAKY_TEST.
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // FLAKY_TEST.
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // FLAKY_TEST.
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/op_bool.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp

@@ -8,6 +8,7 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
+// XFAIL: dylib-has-no-shared_mutex
 
 // <shared_mutex>
 

utils/libcxx/test/config.py

@@ -1145,6 +1145,10 @@ class Configuration(object):
         # features are enabled/disabled. Otherwise, disable availability markup,
         # which is not relevant for non-shipped flavors of libc++.
         if self.use_system_cxx_lib:
+            # Dylib support for shared_mutex was added in macosx10.12.
+            if name == 'macosx' and version in ('10.%s' % v for v in range(7, 12)):
+                self.config.available_features.add('dylib-has-no-shared_mutex')
+                self.lit_config.note("shared_mutex is not supported by the deployment target")
             # Throwing bad_optional_access, bad_variant_access and bad_any_cast is
             # supported starting in macosx10.14.
             if name == 'macosx' and version in ('10.%s' % v for v in range(7, 14)):