Adding Libraries as source units

libsolidity/CompilerStack.cpp

@@ -58,14 +58,15 @@ CompilerStack::CompilerStack(bool _addStandardSources):
 	m_addStandardSources(_addStandardSources), m_parseSuccessful(false)
 {
 	if (m_addStandardSources)
-		addSources(StandardSources);
+		addSources(StandardSources, true); // add them as libraries
 }
 
-bool CompilerStack::addSource(string const& _name, string const& _content)
+bool CompilerStack::addSource(string const& _name, string const& _content, bool _isLibrary)
 {
 	bool existed = m_sources.count(_name) != 0;
 	reset(true);
 	m_sources[_name].scanner = make_shared<Scanner>(CharStream(expanded(_content)), _name);
+	m_sources[_name].isLibrary = _isLibrary;
 	return existed;
 }
 
@@ -328,7 +329,8 @@ void CompilerStack::resolveImports()
 	};
 
 	for (auto const& sourcePair: m_sources)
-		toposort(&sourcePair.second);
+		if (!sourcePair.second.isLibrary)
+			toposort(&sourcePair.second);
 
 	swap(m_sourceOrder, sourceOrder);
 }

libsolidity/CompilerStack.h

@@ -64,8 +64,8 @@ public:
 
 	/// Adds a source object (e.g. file) to the parser. After this, parse has to be called again.
 	/// @returns true if a source object by the name already existed and was replaced.
-	void addSources(std::map<std::string, std::string> const& _nameContents) { for (auto const& i: _nameContents) addSource(i.first, i.second); }
-	bool addSource(std::string const& _name, std::string const& _content);
+	void addSources(std::map<std::string, std::string> const& _nameContents, bool _isLibrary = false) { for (auto const& i: _nameContents) addSource(i.first, i.second, _isLibrary); }
+	bool addSource(std::string const& _name, std::string const& _content, bool _isLibrary = false);
 	void setSource(std::string const& _sourceCode);
 	/// Parses all source units that were added
 	void parse();
@@ -125,7 +125,8 @@ private:
 		std::shared_ptr<Scanner> scanner;
 		std::shared_ptr<SourceUnit> ast;
 		std::string interface;
-		void reset() { scanner.reset(); ast.reset(); interface.clear(); }
+		bool isLibrary;
+		void reset() { scanner.reset(); ast.reset(); interface.clear(); isLibrary = false;}
 	};
 
 	struct Contract