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-rw-r--r--libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
index eac7600b5d1..9e20144e8c8 100644
--- a/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
@@ -10,6 +10,11 @@
// XFAIL: libcpp-no-exceptions
// UNSUPPORTED: libcpp-has-no-threads
+// This test hangs forever when built against libstdc++. In order to allow
+// validation of the test suite against other STLs we have to mark it
+// unsupported.
+// UNSUPPORTED: libstdc++
+
// <mutex>
// template <class L1, class L2, class... L3>
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