------- Comment #11 from jakub at gcc dot gnu dot org  2010-08-31 20:53 -------
Because when foo is not static, it has to be compiled.  If it is static, GCC
figures it is a pure function (only reads memory and arguments and computes
from it its return value) and as the result in main of the function isn't used,
that call is optimized away very early.  As foo isn't used anywhere else, it
isn't compiled at all.



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