[fpc-devel] Dangerous optimization in CASE..OF

[Martok]

Am 16.07.2017 um 19:58 schrieb Ondrej Pokorny:
> On 16.07.2017 19:24, Martok wrote:
>> The good thing about case statements is that they tell me of every other
>> programmer error: missing elements (if used without else)
> Off-topic: how can I enable this compiler hint?
Erm, I was referring to the "normal" DFA, ie. for function results or variable
initialization.

type
  TEnum = (one, two);

function GetInteger(A: TEnum): Integer;
begin
  case A of
    one: Result:= 1;
  end;
end;

... which for some reason only Warns in -O3, and then it's "wrong" sometimes
too, because DFA assumes that enums are Low-Level enums. That was the other
thread on this list recently.

Yeah. Probably a bad argument, sorry.

Martok