Implement builders to build Boost from source code

tests/sources/main-headers.cpp

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+#include <cassert>
+#include <exception>
+#include <iostream>
+#include <cstdint>
+
+#include <boost/safe_numerics/safe_integer.hpp>
+
+int main()
+{
+	std::cout << "Using safe numerics" << std::endl;
+    try{
+        using namespace boost::safe_numerics;
+        safe<int> x = INT_MAX - 5;
+        ++x;
+    }
+    catch(const std::exception & e){
+        std::cout << e.what() << std::endl;
+        std::cout << "error detected!" << std::endl;
+    }
+
+    return 0;
+}

tests/sources/main.cpp

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+#include <boost/algorithm/string.hpp>
+#include <string>
+#include <iostream>
+
+using namespace boost::algorithm;
+
+int main()
+{
+  std::string s = "Boost C++ Libraries";
+  std::cout << to_upper_copy(s) << '\n';
+
+  return 0;
+}

tests/sources/main_log.cpp

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+#include <boost/log/trivial.hpp>
+
+int main(int, char*[])
+{
+    BOOST_LOG_TRIVIAL(trace) << "A trace severity message";
+    BOOST_LOG_TRIVIAL(debug) << "A debug severity message";
+    BOOST_LOG_TRIVIAL(info) << "An informational severity message";
+    BOOST_LOG_TRIVIAL(warning) << "A warning severity message";
+    BOOST_LOG_TRIVIAL(error) << "An error severity message";
+    BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";
+
+    return 0;
+}