Hector Martin

people think this is a shitpost but no i literally use a c compiler (sdcc) and a target (8051) where reentrancy is opt-in because it is (correctly) considered too expensive to just turn on globallyhttps://twitter.com/whitequark/status/1243027821120958465 …

what does "turning on/off reentrancy" actually do in this context?

by default sdcc behaves as if all locals (parameters, too) are `static`. in fact it will overlap the storage of parameters of all leaf functions. you can turn that off and it uses stack as you'd expect

Or you can use a PIC where there is no data stack at all and then if you still need reentrancy haha good luck you need to emulate the stack using a pointer somewhere and indirect accesses. But reentrancy would overflow the 8-level callstack anyway. 2-level on some PICs.