Improve error message on build failure (#536)

* Improve error message on build failure
* properly report an error message

Author: Massimiliano Pippi

Diff for: cli/compile/compile.go

@@ -86,7 +86,7 @@ func NewCommand() *cobra.Command {
 func run(cmd *cobra.Command, args []string) {
 	inst, err := instance.CreateInstance()
 	if err != nil {
-		feedback.Errorf("Error during build: %v", err)
+		feedback.Errorf("Error creating instance: %v", err)
 		os.Exit(errorcodes.ErrGeneric)
 	}
 

Diff for: commands/compile/compile.go

@@ -163,7 +163,7 @@ func Compile(ctx context.Context, req *rpc.CompileReq, outStream, errStream io.W
 
 	// if it's a regular build, go on...
 	if err := builder.RunBuilder(builderCtx); err != nil {
-		return nil, fmt.Errorf("build failed: %s", err)
+		return nil, err
 	}
 
 	// FIXME: Make a function to obtain these info...

Diff for: legacy/builder/phases/sizer.go

@@ -105,12 +105,12 @@ func checkSize(ctx *types.Context, buildProperties *properties.Map) error {
 
 	if textSize > maxTextSize {
 		logger.Println(constants.LOG_LEVEL_ERROR, constants.MSG_SIZER_TEXT_TOO_BIG)
-		return errors.New("")
+		return errors.New("text section exceeds available space in board")
 	}
 
 	if maxDataSize > 0 && dataSize > maxDataSize {
 		logger.Println(constants.LOG_LEVEL_ERROR, constants.MSG_SIZER_DATA_TOO_BIG)
-		return errors.New("")
+		return errors.New("data section exceeds available space in board")
 	}
 
 	if properties.Get(constants.PROPERTY_WARN_DATA_PERCENT) != "" {