-fPIC -Os generates redundant stack frame

example: https://godbolt.org/z/rYxTPdTcd

gcc versions after 4 (>= 5) generate a redundant stack frame as can be seen in the attached example, while gcc version 4 generates correct code that is also minimal in size as requested (-Os).

The code generation in newer gcc versions is strange even without thinking about the -Os, since the generates stack frame is not even used, and the whole 3 instructions (sub sp, str, add sp) are totally not needed (the variable on the stack is not used).