Hi,

Just in case you don't know. If you want to add any of the standard teensy options you can do so using the vMicro menu.

If you have custom options then you can use the various flags/switches in the Visual Micro project properties

The properties can be opened from the vMicro menu or by right clicking the project name in the solution explorer or various other places. note: The visual micro project properties show as a dockable tool window, the vs project properties (pages) as a dialog.

Project-Properties-Reference.html

In the properties list is an extraFlags option at Global and Configuration levels. Configuration being the Release/Debug combo on the tool bar, global means always use in build.