external: update backward-cpp to v1.4

rename the directory name to backward-cpp

Closes: #803
Signed-off-by: Shengjing Zhu <i@zhsj.me>

external/backward-cpp/test/test.cpp

@@ -0,0 +1,75 @@
+/*
+ * test/test.cpp
+ * Copyright 2013 Google Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <iostream>
+#include <stdexcept>
+#include <cstdlib>
+#include "test/test.hpp"
+
+TEST (empty_test) { }
+
+TEST_FAIL_ASSERT (fail_assert) {
+	ASSERT(1 == 2);
+}
+
+TEST_FAIL_ASSERT (fail_assert_ge) {
+	ASSERT_GE(4, 5);
+}
+
+TEST_UNCAUGHT_EXCEPTION (uncaught_exception) {
+	throw std::runtime_error("some random runtime error");
+}
+
+TEST_UNCAUGHT_EXCEPTION (uncaught_exception_int) {
+	throw 42;
+}
+
+TEST_SEGFAULT (segfault) {
+	char* a = 0;
+	char b = a[42];
+	std::cout << "result: " << b << std::endl;
+}
+
+TEST_ABORT (abort) {
+	abort();
+}
+
+TEST (catch_int) {
+	ASSERT_THROW({throw 42;}, int);
+}
+
+TEST_FAIL_ASSERT (fail_catch_int) {
+	ASSERT_THROW({}, int);
+}
+
+TEST_FAIL_ASSERT (fail_no_throw) {
+	ASSERT_NO_THROW({throw 42;});
+}
+
+TEST (any_throw) {
+	ASSERT_ANY_THROW({throw 42;});
+}
+
+TEST_FAIL_ASSERT (fail_any_throw) {
+	ASSERT_ANY_THROW({});
+}