dear Cfd people, my VisualFortran 6.6 doesn't compile a program, error message being "unknown switch: \annotations: code". We think it depends on my notebook OS, Microsoft Xp, but we aren't sure. Someone can help me? Thank you!

Load a workspace containing your project. Then, on the menu bar at the top of the window, click on "Project" --> "Settings". In the little dialog box that pops up, look under the "Fortran", "Link" and "Browse" tabs, to check for the switch (Project Option) that the compiler complains about. I do not see any such switch under my Project Options, but this may be irrelevant. Incidentally, all the switches begin with a forward slash (/), not a backward slash (\). So perhaps the compiler is complaining about the "\" in "\annotations: code". In any case, if you spot such a switch, you can delete it from the Project Options, and see whether the compilation is then successful. Or, check the online documentation for the correct switch to use for the effect that the Project is trying to achieve.

It should indeed be "/annotations:code" rather than "\annotations:code". The default is /noannotations (Same as /annotations:none)

Below is an extract from the help on this:

/annotations:code

Specifying /annotations:code annotates the machine code listing with descriptions of special instructions used for prefetching, alignment, and so on.