Add markup for libc++ dylib availability

Libc++ is used as a system library on macOS and iOS (amongst others). In order
for users to be able to compile a binary that is intended to be deployed to an
older version of the platform, clang provides the
availability attribute <https://clang.llvm.org/docs/AttributeReference.html#availability>_
that can be placed on declarations to describe the lifecycle of a symbol in the
library.

See docs/DesignDocs/AvailabilityMarkup.rst for more information.

Differential Revision: https://reviews.llvm.org/D31739

llvm-svn: 302172

2 files changed, 4 insertions, 0 deletions

diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/lit.local.cfg b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/lit.local.cfg
new file mode 100644
index 00000000000..fd3dc778c8c
--- /dev/null
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/lit.local.cfg
@@ -0,0 +1,2 @@
+if 'availability' in config.available_features:
+    config.unsupported = True
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/lit.local.cfg b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/lit.local.cfg
new file mode 100644
index 00000000000..fd3dc778c8c
--- /dev/null
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/lit.local.cfg
@@ -0,0 +1,2 @@
+if 'availability' in config.available_features:
+    config.unsupported = True