[bennettnate5]

The problem with this is that a pointer value may be passed through multiple functions or nontrivial control flow before reaching a function with this keyword. To effectively check if the pointer is in the stack or .rodata, it would need to do some kind of reverse data dependency analysis of all the possible places that pointer could come from to ensure none of the control flows could cause that pointer to be changed to a stack pointer.

[fch42]

Also ... the lifetime issue here doesn't preclude the use of stack-based variables. A "local" variable of main() is "as good as" a global/static to pretty much all parts of the program.