DIP 11: trial partial implementation

[Nick Sabalausky]

"Jacob Carlborg" <doob at me.com> wrote in message 
news:itljh6$d4l$1 at digitalmars.com...
> On 2011-06-19 20:31, Nick Sabalausky wrote:
>> "Jacob Carlborg"<doob at me.com>  wrote in message
>> news:itkp2l$1ru0$1 at digitalmars.com...
>>> On 2011-06-19 02:10, Adam D. Ruppe wrote:
>>>> http://arsdnet.net/dcode/build2.d
>>>>
>>>> * Be fast. It loops dmd like my old build.d. (I can't find a better
>>>>     way to do it. Even rdmd always runs dmd at least twice - check
>>>>     its source!)
>>>
>>> That shouldn't be necessary.
>>>
>>> First run:
>>>
>>> * Run the compiler once with the -deps flag to collect the dependencies
>>> * Run the compiler again to compile everything
>>> * Cache dependencies
>>>
>>> Later runs:
>>>
>>> * Run the compiler once with the -deps flag and compile everything
>>
>> Using the -deps flag to *just* get the deps is very fast. Much faster 
>> than a
>> full compile.
>
> I understand that that would be faster when the dependencies have changed 
> but if they haven't then you just have to run the compiler once. Don't 
> know what would be best to do though.
>
> BTW, to just get the dependencies, would that be with the -deps and -c 
> flags? Is the a better way? I mean if you just specify the -deps flag it 
> will do a full compilation. Seems to me that skipping linking (-c flag) is 
> a little too much as well for what's actually necessary. Would be good to 
> have a flag that does only what's absolutely necessary for tracking 
> dependencies.
>

What I meant was that doing a deps-only run is fast enough that doing it 
every time shouldn't be a problem.

However, I am starting to wonder if RDMD's functionality should built into 
DMD (ideally in a way that LDC/GDC wouldn't have to re-implement it 
themselves). DDMD does take about a minute or so to compile, and while the 
deps-only run is the faster part, it's not insignificant. But then, maybe 
that's just due to some fixable inefficiency in DMD? There's very little 
templates/ctfe involved.