--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot> ---
The compiler only sees single compilation units and it doesn't keep 
a database of previously seen units. 
When it compiles it doesn't know anything about

So there really is nothing that the compiler could do here.
And clang and other compilers also don't warn and behave exactly like
gcc once you use -O2.

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