In C/C++ static declarations are local to the compilation unit. So you will have two separate storages for foo - these will be two independent variables. That'

In C/C++ static declarations are local to the compilation unit. So you will have two separate storages for foo - these will be two independent variables. That's how C and C++ work. And if you will have this (no static): int foo = 45; then linker will complain - "multiple 'foo' entities" as non-static entities have global visibility.