avoid codegen pass

[max haughton]

On Saturday, 2 October 2021 at 18:05:06 UTC, Dennis wrote:
> On Saturday, 2 October 2021 at 16:57:48 UTC, max haughton wrote:
>> Do you have optimizations turned on? i.e. are you compiling 
>> with -O by accident?
>
> Not needed, it's declared:
> ```D
> pragma(inline, true) @property _timezone() @safe const pure 
> nothrow @nogc
> ```
>
> DMD does inlining in the frontend, and without the `-inline` 
> flag it still inlines functions when requested by 
> `pragma(inline, true)`. That's why you see it logged even 
> without codegen or `-inline`.
>
> That's not what causes the long compile time though, `dmd -v` 
> logs passes before doing them, not after, so it's the semantic3 
> before the inline pass that's taking all the time.

I was aware (and am not a fan of) inlining in the frontend, but 
didn't look at the Phobos code.

Honestly dmd shouldn't have an optimizer IMO, it's not fit for 
purpose anymore, if you want optimizations use GDC or LDC. 
Inlining doesn't even respect the semantics of the language IIRC