unusedVariable not checked

[Dzid]

static int unusedVariable;
int main(void){
}

./cppcheck --enable=all test.c

Checking test.c ...
nofile:0:0: information: Active checkers: 107/802 (use --checkers-report=<filename> to see details) [checkersReport]

I would expect unusedVariable to be reported but nothing shows up.
If I move the unusedVariable inside main(), then it is reported.

(I think I posted to wrong channel. )

[CHR]

Covered by https://trac.cppcheck.net/ticket/10690