Import backtrace-cpp and integrate it into our main executable

Upstream release
https://github.com/bombela/backward-cpp/archive/v1.3.tar.gz

external/backtrace-cpp/test/rectrace.cpp

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+/*
+ * test/rectrace.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 "backward.hpp"
+#include <stdio.h>
+#include "test/test.hpp"
+
+using namespace backward;
+
+typedef StackTrace stacktrace_t;
+
+void end_of_our_journey(stacktrace_t& st) {
+	if (not st.size()) {
+		st.load_here();
+	}
+}
+
+int rec(stacktrace_t& st, int level) {
+	if (level <= 1) {
+		end_of_our_journey(st);
+		return 0;
+	}
+	return rec(st, level - 1);
+}
+
+namespace toto {
+
+namespace titi {
+
+	struct foo {
+
+		union bar {
+			__attribute__((noinline))
+			static int trampoline(stacktrace_t& st, int level) {
+				return rec(st, level);
+			}
+		};
+ };
+
+} // namespace titi
+
+} // namespace toto
+
+TEST (recursion) {
+	{ // lexical scope.
+		stacktrace_t st;
+		const int input = 3;
+		int r = toto::titi::foo::bar::trampoline(st, input);
+
+		std::cout << "rec(" << input << ") == " << r << std::endl;
+
+		Printer printer;
+		//    printer.address = true;
+		printer.object = true;
+		printer.print(st, stdout);
+	}
+}
+
+int fib(StackTrace& st, int level) {
+	if (level == 2) {
+		return 1;
+	}
+	if (level <= 1) {
+		end_of_our_journey(st);
+		return 0;
+	}
+	return fib(st, level - 1) + fib(st, level - 2);
+}
+
+TEST (fibrecursive) {
+	StackTrace st;
+	const int input = 6;
+	int r = fib(st, input);
+
+	std::cout << "fib(" << input << ") == " << r << std::endl;
+
+	Printer printer;
+	printer.print(st, stdout);
+}