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

1 files changed, 5 insertions, 5 deletions

diff --git a/libcxx/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp b/libcxx/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp
index bf2a2e58913..24847dd70f8 100644
--- a/libcxx/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp
+++ b/libcxx/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp
@@ -7,15 +7,15 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This test uses new symbols that were not defined in the libc++ shipped on
-// darwin11 and darwin12:
-// XFAIL: with_system_cxx_lib=x86_64-apple-macosx10.7
-// XFAIL: with_system_cxx_lib=x86_64-apple-macosx10.8
-
 // Due to C++17 inline variables ASAN flags this test as containing an ODR
 // violation because Clock::is_steady is defined in both the dylib and this TU.
 // UNSUPPORTED: asan
 
+// Starting with C++17, Clock::is_steady is inlined (but not before LLVM-3.9!),
+// but before C++17 it requires the symbol to be present in the dylib.
+// XFAIL: availability=macosx10.7 && (c++98 || c++03 || c++11 || c++14 || apple-clang-7 || apple-clang-8.0)
+// XFAIL: availability=macosx10.8 && (c++98 || c++03 || c++11 || c++14 || apple-clang-7 || apple-clang-8.0)
+
 // <chrono>
 
 // high_resolution_clock