Speed up compilation in Visual D

[Rainer Schuetze]

On 28/04/2019 13:47, Alex wrote:
> On Sunday, 28 April 2019 at 08:25:18 UTC, Rainer Schuetze wrote:
>>
>>
>> On 26/04/2019 09:52, Rainer Schuetze wrote:
>>>> As if when generating the command line for single file compilation
>>>> you forgot to append the additional options string to it.
>>> Yes, looks like a bug in Visual D: it adds the additional command
>>> line options to the link, but not to the single file compiler
>>> invocations.
>>>
>>
>> fixed in https://github.com/dlang/visuald/releases/tag/v0.49.2
> 
> Man, it's really slow compiling!
> 
> It took over 3 minutes to compile the same project that compiles in 10
> seconds with combined compile.

Yes, it's usually that bad if you have a good number of dependencies
(imports).

> 
> Even after compilation of all the object files it takes 10 seconds just
> to recompile 1 file.
> 

If a single file needs 10 sec, there are probably quite a few imports.
You can check the dep-files in the intermediate directory to see
detected dependencies.

> There is absolutely no speed up.
> 
> Also, I always get
> 
> x64\Debug DMD\S.exe not up to date: d:\repos\s\s\x64\debug dmd\s.exe
> older than d:\repos\s\s\$(outdir)\g\d\set.obj

That sounds like it is only linking again, though "$(outdir)" in the
name looks wrong. Is that really your build directory?

> and so it has to build this one obj file every time.
> I'm not sure what is going on here set.d is not being changed as far as
> I know.
> 
> In any case, unless there is a huge bug in single file compilation I
> don't see it being at all faster than combined compile.
> 

Combined compilation is preferred in most cases. If you can separate
into non-dependent libraries that could help.