Include license and warranty statement with solc.

solc/CommandLineInterface.cpp

@@ -94,6 +94,7 @@ static string const g_strHelp = "help";
 static string const g_strInputFile = "input-file";
 static string const g_strInterface = "interface";
 static string const g_strJulia = "julia";
+static string const g_strLicense = "license";
 static string const g_strLibraries = "libraries";
 static string const g_strLink = "link";
 static string const g_strMetadata = "metadata";
@@ -186,6 +187,14 @@ static void version()
 	exit(0);
 }
 
+static void license()
+{
+	cout <<
+		#include <solc/license_escaped.h>
+	<< endl;
+	exit(0);
+}
+
 static bool needsHumanTargetedStdout(po::variables_map const& _args)
 {
 	if (_args.count(g_argGas))
@@ -510,8 +519,13 @@ void CommandLineInterface::createFile(string const& _fileName, string const& _da
 bool CommandLineInterface::parseArguments(int _argc, char** _argv)
 {
 	// Declare the supported options.
-	po::options_description desc(
-		R"(solc, the Solidity commandline compiler.
+	po::options_description desc(R"(solc, the Solidity commandline compiler.
+
+Solidity Copyright (C) 2014-2017 Ethereum Foundation.
+This program comes with ABSOLUTELY NO WARRANTY. This is free software, and you
+are welcome to redistribute it under certain conditions. See 'solc --license'
+for details.
+
 Usage: solc [options] [input_file...]
 Compiles the given Solidity input files (or the standard input if none given or
 "-" is used as a file name) and outputs the components specified in the options
@@ -523,10 +537,12 @@ remap paths using the context:prefix=path syntax.
 
 Allowed options)",
 		po::options_description::m_default_line_length,
-		po::options_description::m_default_line_length - 23);
+		po::options_description::m_default_line_length - 23
+	);
 	desc.add_options()
 		(g_argHelp.c_str(), "Show help message and exit.")
 		(g_argVersion.c_str(), "Show version and exit.")
+		(g_strLicense.c_str(), "Show licensing information and exit.")
 		(g_argOptimize.c_str(), "Enable bytecode optimizer.")
 		(
 			g_argOptimizeRuns.c_str(),
@@ -633,6 +649,12 @@ Allowed options)",
 		return false;
 	}
 
+	if (m_args.count(g_strLicense))
+	{
+		license();
+		return false;
+	}
+
 	if (m_args.count(g_argCombinedJson))
 	{
 		vector<string> requests;