There is some history on that:

https://gitlab.kitware.com/cmake/cmake/issues/7835  linked to older
https://itk.org/Bug/view.php?id=7835

May be this is a plain feature request that should be properly written
based on history and current usage.
Typically I think that anyone would want to add any file to IDE project
display.


2018-02-02 14:57 GMT+01:00 J. Caleb Wherry <calebwhe...@gmail.com>:

> Yes, I understand that. The error message is pretty clear.
>
> My main question is really why is that the case? In VS, there is no
> restriction to adding files to a utility project. So why does CMake have
> this restriction?
>
> I assume it is because it is generator specific and there isn’t a clean
> way to implement add_custom_target across all of them. In that case I would
> expect some special case handling for generators that do support it.
>
> And it’s not like CMake can’t add files to that Utility project, because
> it does: it adds the Java rules files. It just doesn’t allow the user the
> do the same. It’s a restriction that doesn’t really make sense to me.
>
> -Caleb
>
> On Fri, Feb 2, 2018 at 3:35 AM CHEVRIER, Marc <marc.chevr...@sap.com>
> wrote:
>
>> This approach is not possible for Java because the command add_jar is
>> implemented using commands add_custom_command and add_custom_target. And
>> command target_sources implies that the target was created by one the
>> commands add_library or add_executable.
>>
>>
>>
>>
>>
>> *From: *CMake <cmake-boun...@cmake.org> on behalf of "J. Caleb Wherry" <
>> calebwhe...@gmail.com>
>> *Date: *Thursday 1 February 2018 at 19:30
>> *To: *CMake ML <cmake@cmake.org>
>> *Subject: *[CMake] How to add files to Visual Studio 'Utility' project
>>
>>
>>
>> Hello!
>>
>>
>>
>> I am having trouble with a generated VS project that I hope is either a
>> bug or has an easy fix...
>>
>>
>>
>> When using UseJava, the add_jar function, and Visual Studio 2015, a VS
>> 'Utility' project is created. I then want to add additional non-compiled
>> files to this project so I try to use target_sources but get his error:
>>
>>
>>
>> "target_sources called with non-compilable target type"
>>
>>
>>
>> In VS, I can easily add files to the project without issue. But I cannot
>> seem to add any additional files to this created 'Utility' project through
>> CMake.
>>
>>
>>
>> I do this in other projects by using target_sources and setting the
>> HEADER_FILE_ONLY and WRAP_EXCLUDE properties to make sure the project
>> doesn't do anything with them and it works fine. Just can't do it for these
>> Utility projects.
>>
>>
>>
>> My use case here is that the add_jar command doesn't actually add the
>> java source files to the project. I want to use VS as a code editor in this
>> case because it builds the jar. However, without them in the project, I
>> have to go outside of VS to edit them (and thus outside of my VS perforce
>> control).
>>
>>
>>
>> Thoughts? Maybe I am adding them incorrectly?
>>
>>
>>
>> -Caleb
>>
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-- 
Eric
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