[CMAKE] export only preprocessed source

Author: facchinm

Diff for: src/arduino.cc/builder/create_cmake_rule.go

@@ -106,6 +106,19 @@ func (s *ExportProjectCMake) Run(ctx *types.Context) error {
 	if err != nil {
 		fmt.Println(err)
 	}
+
+	// Use old ctags method to generate export file
+	commands := []types.Command{
+		&ContainerMergeCopySketchFiles{},
+		&ContainerAddPrototypes{},
+		&FilterSketchSource{Source: &ctx.Source, RemoveLineMarkers: true},
+		&SketchSaver{},
+	}
+
+	for _, command := range commands {
+		command.Run(ctx)
+	}
+
 	err = utils.CopyDir(ctx.SketchBuildPath, filepath.Join(cmakeFolder, "sketch"), extensions)
 	if err != nil {
 		fmt.Println(err)

Diff for: src/arduino.cc/builder/filter_sketch_source.go

@@ -39,7 +39,8 @@ import (
 )
 
 type FilterSketchSource struct {
-	Source *string
+	Source            *string
+	RemoveLineMarkers bool
 }
 
 func (s *FilterSketchSource) Run(ctx *types.Context) error {
@@ -57,6 +58,9 @@ func (s *FilterSketchSource) Run(ctx *types.Context) error {
 		filename := parseLineMarker(line)
 		if filename != "" {
 			inSketch = utils.SliceContains(fileNames, filename)
+			if inSketch && s.RemoveLineMarkers {
+				continue
+			}
 		}
 
 		if inSketch {
@@ -79,7 +83,7 @@ func parseLineMarker(line string) string {
 	// https://github.com/gcc-mirror/gcc/blob/edd716b6b1caa1a5cb320a8cd7f626f30198e098/gcc/c-family/c-ppoutput.c#L413-L415
 
 	split := strings.SplitN(line, " ", 3)
-	if len(split) < 3 || split[0] != "#" {
+	if len(split) < 3 || len(split[0]) == 0 || split[0][0] != '#' {
 		return ""
 	}