Using tool tips and icons, breakpoint information is presented in and
out of a debug session:
- When out of a debug session and no build has occurred - if you try
to set a breakpoint, a mouse tool tip displays with a blue torn icon stating no
debug information is available.
- When out of a debug session and a build has occurred - if a line
has been optimized out, a breakpoint can either be possible or not possible.
- When in a debug session - the tool tip shows whether a breakpoint
can be set or not.
The option to show a tool tip can be disabled if you do not want it
(Tools>Options, Embedded, “Generic Settings”).