Add nowarn compiler option

Author: veblush

core/IncrementalCompiler/CompileOptions.cs

@@ -29,6 +29,7 @@ public class CompileOptions
         [DataMember] public List<string> Defines = new List<string>();
         [DataMember] public List<string> References = new List<string>();
         [DataMember] public List<string> Files = new List<string>();
+        [DataMember] public List<string> NoWarnings = new List<string>();
         [DataMember] public DebugSymbolFileType DebugSymbolFile;
         [DataMember] public PrebuiltOutputReuseType PrebuiltOutputReuse;
 
@@ -68,6 +69,17 @@ public void ParseArgument(string[] args)
                             Output = value.Trim('"');
                             AssemblyName = Path.GetFileNameWithoutExtension(value);
                             break;
+
+                        case "nowarn":
+                            foreach (var id in value.Split(new char[] {',', ';', ' '},
+                                                           StringSplitOptions.RemoveEmptyEntries))
+                            {
+                                int num;
+                                NoWarnings.Add(int.TryParse(id, out num)
+                                    ? string.Format("CS{0:0000}", num)
+                                    : id);
+                            }
+                            break;
                     }
                 }
                 else if (arg.StartsWith("@"))

core/IncrementalCompiler/Compiler.cs

@@ -30,6 +30,7 @@ public CompileResult Build(CompileOptions options)
                 _options.WorkDirectory != options.WorkDirectory ||
                 _options.AssemblyName != options.AssemblyName ||
                 _options.Output != options.Output ||
+                _options.NoWarnings.SequenceEqual(options.NoWarnings) == false ||
                 _options.Defines.SequenceEqual(options.Defines) == false)
             {
                 return BuildFull(options);
@@ -62,11 +63,13 @@ private CompileResult BuildFull(CompileOptions options)
                 file => file,
                 file => ParseSource(file, parseOption));
 
+            var specificDiagnosticOptions = options.NoWarnings.ToDictionary(x => x, _ => ReportDiagnostic.Suppress);
             _compilation = CSharpCompilation.Create(
                 options.AssemblyName,
                 _sourceMap.Values,
                 _referenceMap.Values,
-                new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
+                new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
+                    .WithSpecificDiagnosticOptions(specificDiagnosticOptions));
 
             Emit(result);