fix print only case

shared/compiler.go

@@ -31,18 +31,18 @@ func Compile(args []string, compilerName string) (exitCode int) {
 	var pr = parse(args)
 
 	var wg sync.WaitGroup
-	// If configure only is set, just execute the compiler
 
-	if configureOnly {
+	// If configure only or print only are set, just execute the compiler
+	if configureOnly || pr.IsPrintOnly {
 		wg.Add(1)
 		go execCompile(compilerExecName, pr, &wg, &ok)
 		wg.Wait()
-		// Else try to build bitcode as well
 
 		if !ok {
 			exitCode = 1
 		}
 
+	// Else try to build bitcode as well
 	} else {
 		var bcObjLinks []bitcodeToObjectLink
 		var newObjectFiles []string

shared/parser.go

@@ -25,6 +25,7 @@ type parserResult struct {
 	IsAssembly       bool
 	IsCompileOnly    bool
 	IsEmitLLVM       bool
+	IsPrintOnly      bool
 }
 
 type flagInfo struct {
@@ -37,6 +38,7 @@ func parse(argList []string) parserResult {
 	pr.InputList = argList
 
 	var argsExactMatches = map[string]flagInfo{
+		"-":  {0, pr.printOnlyCallback},
 		"-o": {1, pr.outputFileCallback},
 		"-c": {0, pr.compileOnlyCallback},
 		"-E": {0, pr.preprocessOnlyCallback},
@@ -194,7 +196,7 @@ func parse(argList []string) parserResult {
 		`^-print-file-name=.*$`:                 {0, pr.compileUnaryCallback},
 	}
 
-	for len(argList) > 0 && !(pr.IsAssembly || pr.IsAssembleOnly || pr.IsPreprocessOnly) {
+	for len(argList) > 0 {
 		var elem = argList[0]
 
 		// Try to match the flag exactly
@@ -279,6 +281,10 @@ func (pr *parserResult) dependencyOnlyCallback(flag string, _ []string) {
 	pr.CompileArgs = append(pr.CompileArgs, flag)
 }
 
+func (pr *parserResult) printOnlyCallback(flag string, _ []string) {
+	pr.IsPrintOnly = true
+}
+
 func (pr *parserResult) assembleOnlyCallback(_ string, _ []string) {
 	pr.IsAssembleOnly = true
 }

shared/utils.go

@@ -10,6 +10,7 @@ func execCmd(cmdExecName string, args []string, workingDir string) (success bool
 	cmd := exec.Command(cmdExecName, args...)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
+	cmd.Stdin  = os.Stdin
 	cmd.Dir = workingDir
 	err = cmd.Run()
 	success = (err == nil)