[objc] Update command line options for compilation target (#288)

- drop all single arguments for compilation target (--dll, --shared, --static).
- use the right value names for --target.
- [tests] Update Static_Unsupported to use --target

objcgen/driver.cs

@@ -73,13 +73,11 @@ namespace Embeddinator {
 				},
 				{ "o|out|outdir=", "Output directory", v => embedder.OutputDirectory = v },
 				{ "p|platform=", $"Target platform (iOS, macOS [default], watchOS, tvOS)", v => embedder.SetPlatform (v) },
-				{ "dll|shared", "Compiles as a shared library (default)", v => embedder.CompilationTarget = CompilationTarget.SharedLibrary },
-				{ "static", "Compiles as a static library (unsupported)", v => embedder.CompilationTarget = CompilationTarget.StaticLibrary },
 				{ "vs=", $"Visual Studio version for compilation (unsupported)", v => { throw new EmbeddinatorException (2, $"Option `--vs` is not supported"); } },
 				{ "h|?|help", "Displays the help", v => action = Action.Help },
 				{ "v|verbose", "generates diagnostic verbose output", v => ErrorHelper.Verbosity++ },
 				{ "version", "Display the version information.", v => action = Action.Version },
-				{ "target=", "The compilation target (static, shared, framework).", v => embedder.SetCompilationTarget (v) },
+				{ "target=", "The compilation target (staticlibrary, sharedlibrary, framework).", embedder.SetCompilationTarget },
 			};
 
 			var assemblies = os.Parse (args);

tests/objcgentest/DriverTest.cs

@@ -130,7 +130,7 @@ namespace DriverTest {
 		public void Static_Unsupported ()
 		{
 			try {
-				Driver.Main2 (new [] { "--static" });
+				Driver.Main2 (new [] { "--target=staticlibrary" });
 			} catch (EmbeddinatorException ee) {
 				Assert.True (ee.Error, "Error");
 				Assert.That (ee.Code, Is.EqualTo (2), "Code");