main: add tests for less common build configurations

Don't run the entire test suite for these options, as that would quickly
explode the testing time (making it less likely people actually run it).
Instead, run just one test for each configuration that should check for
most issues.

main_test.go

@@ -113,6 +113,32 @@ func TestCompiler(t *testing.T) {
 			runPlatTests("wasi", tests, t)
 		})
 	}
+
+	// Test a few build options.
+	t.Run("build-options", func(t *testing.T) {
+		if runtime.GOOS == "windows" {
+			// These tests assume a host that is supported by TinyGo.
+			t.Skip("can't test build options on Windows")
+		}
+		t.Parallel()
+
+		// Test with few optimizations enabled (no inlining, etc).
+		t.Run("opt=1", func(t *testing.T) {
+			t.Parallel()
+			runTestWithConfig("stdlib.go", "", t, &compileopts.Options{
+				Opt: "1",
+			}, nil)
+		})
+
+		// Test with only the bare minimum of optimizations enabled.
+		// TODO: fix this for stdlib.go, which currently fails.
+		t.Run("opt=0", func(t *testing.T) {
+			t.Parallel()
+			runTestWithConfig("print.go", "", t, &compileopts.Options{
+				Opt: "0",
+			}, nil)
+		})
+	})
 }
 
 func runPlatTests(target string, tests []string, t *testing.T) {
@@ -150,6 +176,21 @@ func runBuild(src, out string, opts *compileopts.Options) error {
 }
 
 func runTest(name, target string, t *testing.T, environmentVars []string) {
+	options := &compileopts.Options{
+		Target:     target,
+		Opt:        "z",
+		PrintIR:    false,
+		DumpSSA:    false,
+		VerifyIR:   true,
+		Debug:      true,
+		PrintSizes: "",
+		WasmAbi:    "",
+	}
+	runTestWithConfig(name, target, t, options, environmentVars)
+}
+
+func runTestWithConfig(name, target string, t *testing.T, options *compileopts.Options, environmentVars []string) {
+	// Get the expected output for this test.
 	// Note: not using filepath.Join as it strips the path separator at the end
 	// of the path.
 	path := TESTDATA + "/" + name
@@ -176,19 +217,8 @@ func runTest(name, target string, t *testing.T, environmentVars []string) {
 	}()
 
 	// Build the test binary.
-	config := &compileopts.Options{
-		Target:     target,
-		Opt:        "z",
-		PrintIR:    false,
-		DumpSSA:    false,
-		VerifyIR:   true,
-		Debug:      true,
-		PrintSizes: "",
-		WasmAbi:    "",
-	}
-
 	binary := filepath.Join(tmpdir, "test")
-	err = runBuild("./"+path, binary, config)
+	err = runBuild("./"+path, binary, options)
 	if err != nil {
 		printCompilerError(t.Log, err)
 		t.Fail()