Do not try to export binaries if --only-compilation-database is set

otherwise an empty "build/fqbn/..." folder is created if "always-export-binaries"
option is set via config file.

Author: cmaglie

commands/compile/compile.go

@@ -213,8 +213,16 @@ func Compile(ctx context.Context, req *rpc.CompileReq, outStream, errStream io.W
 		return r, err
 	}
 
+	exportBinaries := req.GetExportBinaries()
 	// If the export directory is set we assume you want to export the binaries
-	if req.GetExportBinaries() || req.GetExportDir() != "" {
+	if req.GetExportDir() != "" {
+		exportBinaries = true
+	}
+	// If CreateCompilationDatabaseOnly is set, we do not need to export anything
+	if req.GetCreateCompilationDatabaseOnly() {
+		exportBinaries = false
+	}
+	if exportBinaries {
 		var exportPath *paths.Path
 		if exportDir := req.GetExportDir(); exportDir != "" {
 			exportPath = paths.New(exportDir)