Is it safe to return an optional stack value?

[dee0xeed]

@kristoff

The only thing that can cause trouble are pointers

Overall variable experience

int *return_lva(void) { int x; return &x; } #include <stdio.h> int main(void) { int *xp = return_lva(); printf("xp = %p\n", xp); } gcc (9.4.0) warns (at least) about this, even without -Wall: $ gcc lva.c lva.c: In function ‘return_lva’: lva.c:5:12: warning: function returns address of local variable [-Wreturn-local-addr] 5 | return &x; | ^~