Why is command line options disabled in the Build settings dialog?
Answer
In the commercial versions of Atollic TrueSTUDIO, command line options can be configured using GUI widgets in the "Project Properties, Build settings" dialog box.
In the free Lite version, this feature is disabled and developers must add command line options (such as -Wall, -Os, etc) manually by entering them in the "Other options" field in the "Miscellaneous" panel.
Upgrade to a commercial version of the product to get access to GUI configuration of command line options.