Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/language.support/support.runtime/csignal.pass.cpp

@@ -0,0 +1,57 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// test <csignal>
+
+#include <csignal>
+#include <type_traits>
+
+#ifndef SIG_DFL
+#error SIG_DFL not defined
+#endif
+
+#ifndef SIG_ERR
+#error SIG_ERR not defined
+#endif
+
+#ifndef SIG_IGN
+#error SIG_IGN not defined
+#endif
+
+#ifndef SIGABRT
+#error SIGABRT not defined
+#endif
+
+#ifndef SIGFPE
+#error SIGFPE not defined
+#endif
+
+#ifndef SIGILL
+#error SIGILL not defined
+#endif
+
+#ifndef SIGINT
+#error SIGINT not defined
+#endif
+
+#ifndef SIGSEGV
+#error SIGSEGV not defined
+#endif
+
+#ifndef SIGTERM
+#error SIGTERM not defined
+#endif
+
+int main()
+{
+    std::sig_atomic_t sig;
+    typedef void (*func)(int);
+    static_assert((std::is_same<decltype(std::signal(0, (func)0)), func>::value), "");
+    static_assert((std::is_same<decltype(std::raise(0)), int>::value), "");
+}