CommandLineParser: Replace global sout/serr streams with class members

- This removes the global variable and prevents stderr/stdout from being printed in tests

solc/CommandLineInterface.cpp

@@ -474,11 +474,11 @@ void CommandLineInterface::createJson(string const& _fileName, string const& _js
 
 bool CommandLineInterface::parseArguments(int _argc, char** _argv)
 {
-	CommandLineParser parser;
+	CommandLineParser parser(sout(false), serr(false));
 	bool success = parser.parse(_argc, _argv);
 	if (!success)
 		return false;
-	g_hasOutput = g_hasOutput || CommandLineParser::hasOutput();
+	g_hasOutput = g_hasOutput || parser.hasOutput();
 	m_options = parser.options();
 
 	return true;

solc/CommandLineParser.cpp

@@ -49,24 +49,16 @@ namespace po = boost::program_options;
 namespace solidity::frontend
 {
 
-static bool g_hasOutput = false;
-
-namespace
-{
-
-std::ostream& sout()
+ostream& CommandLineParser::sout()
 {
-	g_hasOutput = true;
-	return cout;
+	m_hasOutput = true;
+	return m_sout;
 }
 
-std::ostream& serr(bool _used = true)
+ostream& CommandLineParser::serr()
 {
-	if (_used)
-		g_hasOutput = true;
-	return cerr;
-}
-
+	m_hasOutput = true;
+	return m_serr;
 }
 
 #define cout
@@ -248,7 +240,7 @@ static set<string> const g_metadataHashArgs
 	g_strNone
 };
 
-static void version()
+void CommandLineParser::version()
 {
 	sout() <<
 		"solc, the solidity compiler commandline interface" <<
@@ -259,18 +251,16 @@ static void version()
 	exit(0);
 }
 
-static void license()
+void CommandLineParser::license()
 {
 	sout() << otherLicenses << endl;
 	// This is a static variable generated by cmake from LICENSE.txt
 	sout() << licenseText << endl;
 	exit(0);
 }
 
-namespace
-{
 
-bool checkMutuallyExclusive(boost::program_options::variables_map const& args, std::string const& _optionA, std::string const& _optionB)
+bool CommandLineParser::checkMutuallyExclusive(boost::program_options::variables_map const& args, string const& _optionA, string const& _optionB)
 {
 	if (args.count(_optionA) && args.count(_optionB))
 	{
@@ -281,8 +271,6 @@ bool checkMutuallyExclusive(boost::program_options::variables_map const& args, s
 	return true;
 }
 
-}
-
 bool OutputSelection::operator==(OutputSelection const& _other) const
 {
 	static_assert(
@@ -498,7 +486,7 @@ bool CommandLineParser::parseLibraryOption(string const& _input)
 
 bool CommandLineParser::parse(int _argc, char const* const* _argv)
 {
-	g_hasOutput = false;
+	m_hasOutput = false;
 
 	// Declare the supported options.
 	po::options_description desc((R"(solc, the Solidity commandline compiler.
@@ -1194,11 +1182,6 @@ General Information)").c_str(),
 	return true;
 }
 
-bool CommandLineParser::hasOutput()
-{
-	return g_hasOutput;
-}
-
 bool CommandLineParser::parseCombinedJsonOption()
 {
 	if (!m_args.count(g_argCombinedJson))
@@ -1250,4 +1233,5 @@ string CommandLineParser::joinOptionNames(vector<string> const& _optionNames, st
 		_separator
 	);
 }
+
 } // namespace solidity::frontend

solc/CommandLineParser.h

@@ -161,6 +161,11 @@ struct CommandLineOptions
 class CommandLineParser
 {
 public:
+	explicit CommandLineParser(std::ostream& _sout, std::ostream& _serr):
+		m_sout(_sout),
+		m_serr(_serr)
+	{}
+
 	/// Parses the command-line arguments and fills out the internal CommandLineOptions structure.
 	/// Performs validation and prints error messages. If requested, prints usage banner, version
 	/// or license.
@@ -172,9 +177,8 @@ class CommandLineParser
 
 	CommandLineOptions const& options() const { return m_options; }
 
-	/// Returns true if any parser instance has written anything to cout or cerr since the last
-	/// call to parse().
-	static bool hasOutput();
+	/// Returns true if the parser has written anything to any of its output streams.
+	bool hasOutput() const { return m_hasOutput; }
 
 private:
 	/// Parses the value supplied to --combined-json.
@@ -191,9 +195,28 @@ class CommandLineParser
 	/// @return false if there are any validation errors, true otherwise.
 	bool parseLibraryOption(std::string const& _input);
 
+	bool checkMutuallyExclusive(
+		boost::program_options::variables_map const& args,
+		std::string const& _optionA,
+		std::string const& _optionB
+	);
+	void version();
+	void license();
 	size_t countEnabledOptions(std::vector<std::string> const& _optionNames) const;
 	static std::string joinOptionNames(std::vector<std::string> const& _optionNames, std::string _separator = ", ");
 
+	/// Returns the stream that should receive normal output. Sets m_hasOutput to true if the
+	/// stream has ever been used.
+	std::ostream& sout();
+
+	/// Returns the stream that should receive error output. Sets m_hasOutput to true if the
+	/// stream has ever been used.
+	std::ostream& serr();
+
+	bool m_hasOutput = false;
+	std::ostream& m_sout;
+	std::ostream& m_serr;
+
 	CommandLineOptions m_options;
 
 	/// Map of command-line arguments produced by boost::program_options.

test/solc/CommandLineParser.cpp

@@ -44,7 +44,7 @@ using namespace solidity::yul;
 namespace
 {
 
-optional<CommandLineOptions> parseCommandLine(vector<string> const& commandLine)
+optional<CommandLineOptions> parseCommandLine(vector<string> const& commandLine, ostream& _stdout, ostream& _stderr)
 {
 	size_t argc = commandLine.size();
 	vector<char const*> argv(commandLine.size() + 1);
@@ -55,7 +55,7 @@ optional<CommandLineOptions> parseCommandLine(vector<string> const& commandLine)
 	for (size_t i = 0; i < argc; ++i)
 		argv[i] = commandLine[i].c_str();
 
-	CommandLineParser cliParser;
+	CommandLineParser cliParser(_stdout, _stderr);
 	bool success = cliParser.parse(static_cast<int>(argc), argv.data());
 
 	if (!success)
@@ -88,8 +88,11 @@ BOOST_AUTO_TEST_CASE(no_options)
 		nullopt,
 	};
 
-	optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine);
+	stringstream sout, serr;
+	optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine, sout, serr);
 
+	BOOST_TEST(sout.str() == "");
+	BOOST_TEST(serr.str() == "");
 	BOOST_REQUIRE(parsedOptions.has_value());
 	BOOST_TEST((parsedOptions.value() == expectedOptions));
 }
@@ -200,8 +203,11 @@ BOOST_AUTO_TEST_CASE(cli_mode_options)
 			5,
 		};
 
-		optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine);
+		stringstream sout, serr;
+		optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine, sout, serr);
 
+		BOOST_TEST(sout.str() == "");
+		BOOST_TEST(serr.str() == "");
 		BOOST_REQUIRE(parsedOptions.has_value());
 		BOOST_TEST((parsedOptions.value() == expectedOptions));
 	}
@@ -314,8 +320,11 @@ BOOST_AUTO_TEST_CASE(assembly_mode_options)
 			expectedOptions.yulOptimiserSteps = "agf";
 		}
 
-		optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine);
+		stringstream sout, serr;
+		optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine, sout, serr);
 
+		BOOST_TEST(sout.str() == "");
+		BOOST_TEST(serr.str() == "Warning: Yul is still experimental. Please use the output with care.\n");
 		BOOST_REQUIRE(parsedOptions.has_value());
 
 		BOOST_TEST((parsedOptions.value() == expectedOptions));
@@ -386,8 +395,11 @@ BOOST_AUTO_TEST_CASE(standard_json_mode_options)
 	expectedOptions.combinedJsonRequests->abi = true;
 	expectedOptions.combinedJsonRequests->binary = true;
 
-	optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine);
+	stringstream sout, serr;
+	optional<CommandLineOptions> parsedOptions = parseCommandLine(commandLine, sout, serr);
 
+	BOOST_TEST(sout.str() == "");
+	BOOST_TEST(serr.str() == "");
 	BOOST_REQUIRE(parsedOptions.has_value());
 	BOOST_TEST((parsedOptions.value() == expectedOptions));
 }