Specify LDC to compile specific files

[Rainer Schuetze]

On 03/03/2019 17:44, Michelle Long wrote:
> On Saturday, 2 March 2019 at 17:03:20 UTC, Jacob Carlborg wrote:
>> On 2019-03-02 05:49, Michelle Long wrote:
>>> The problem with LDC is that it is very slow to compile. About 10x
>>> slower than dmd. Unfortunately certain things need ldc to function
>>> such as dcompute.
>>>
>>> It would be nice if one could specify certain files to compile for
>>> ldc only.
>>>
>>>
>>> I guess the only way to accomplish this is to create a new project in
>>> the solution and use LDC for that?
>>
>> Perhaps this is a question specific for Visual Studio and I'm not sure
>> exactly what you're looking for. But generally speaking you could add
>> `version (LDC):` at the top of a file and it would only be compiled if
>> LDC is the compiler.
>>
> 
> But one can only select one compiler using the build configuration. So
> in Visual D one has to use one compiler per project(one can switch at a
> click but that is it).
> 
> So version is useless to be able to do both.
> 
> Visual D could have a combo but it would then require versioning all the
> files.
> 
> 
> If they are not ABI it might be a real problem getting it to work ;/
> 
> 
>> If you're using Dub you can do something like:
>>
>> "sourceFiles-ldc": ["some_file.d"]
> 
> 
> And doing so will use dmd for all the others, compile some_file.d using
> ldc and then work all the details out?
> 
> This is essentially what I'm asking for in Visual D so to speak. To mark
> a file to use LDC and it will effectively do what dub is doing(if it is
> doing it as I stated).
> 

Reading the documentation at
https://dub.pm/package-format-json.html#build-settings I assume it adds
source files specific to the compiler selection, but won't mix different
compilers.

Maybe a mixture works if you only declare extern(C) functions and use
-betterC, but that doesn't seem like a common use case.

With a bit of manual configuration, you could try to build the specific
files with the "custom" build tool, but you'll have to setup the full
command line and dependencies yourself.