1 files changed, 40 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/torture/pr52918-2.C b/gcc/testsuite/g++.dg/torture/pr52918-2.C
new file mode 100644
index 0000000000..ba31295e41
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr52918-2.C
@@ -0,0 +1,40 @@
+// { dg-do compile }
+
+typedef __SIZE_TYPE__ size_t;
+void*   __cxa_allocate_exception(size_t) throw();
+typedef struct { } __gthread_mutex_t;
+extern int __gthr_win32_mutex_unlock (__gthread_mutex_t *);
+int __gthread_mutex_lock (__gthread_mutex_t *__mutex);
+int __gthread_mutex_unlock (__gthread_mutex_t *__mutex);
+void   __throw_concurrence_lock_error();
+void   __throw_concurrence_unlock_error();
+class __mutex   {
+    __gthread_mutex_t _M_mutex;
+public:
+    void lock()     {
+	if (__gthread_mutex_lock(&_M_mutex) != 0)
+	  __throw_concurrence_lock_error();
+    }
+    void unlock()     {
+	if (__gthread_mutex_unlock(&_M_mutex) != 0) 
+	  __throw_concurrence_unlock_error();
+    }
+};
+class __scoped_lock   {
+    typedef __mutex __mutex_type;
+    __mutex_type& _M_device;
+public:
+    explicit __scoped_lock(__mutex_type& __name) : _M_device(__name)     {
+	_M_device.lock();
+    }
+    ~__scoped_lock() throw()    {
+	_M_device.unlock();
+    }
+};
+__mutex emergency_mutex;
+void * __cxa_allocate_exception(size_t thrown_size) throw()
+{
+  void *ret;
+  if (! ret)     
+    __scoped_lock sentry(emergency_mutex);
+}