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ARM Compiler 6 Optimisation, omitted variables without warnings

Finally I have completed the migration of my project from Compiler 5 to Compiler 6.

But that was quite tedious process, and the most actually came from debugging lost variables and functions unknowingly optimised and removed.

There is no warning or comment in the map file.

Volatile keyword doesn't help at all, only __attribute__((used)) works.

How can I actually check which variables and functions have been optimised during compilation and generate them as warnings?

Thanks in advance.