[cmake-developers] Source file dependencies

[Wouter Klouwen]

Hi all,

In trying to improve our build rules, one of the problems I encountered
is that I effectively have some source files that cannot be compiled
unless certain targets are run.

I noticed that cmSourceFile has the AddDepend() method, which looks to
do the kind of thing that I want to do.
cmFlTKWrapUICommand and cmCPluginAPI are the only users of this, with
there being no way of setting this from a CMakeLists.txt.
The former seems to do exactly the kind of think that I need, which is
to set up some code generation.

It would be nice if I could add items to this list, perhaps through
setting a property on the source files themselves, e.g this rather
contrived short example:

add_custom_command(OUTPUT bar.h COMMAND touch bar.h)
add_custom_target(bar DEPENDS generate_bar bar.h)
set_source_files_properties(foo.cpp PROPERTIES DEPENDS bar)

Is this a bad idea? Would there be a better way?

Thanks,
W
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Re: [cmake-developers] Source file dependencies

[Craig Scott]

Have a look at the documentation for the OBJECT_DEPENDS source property
, which
explains some options that may be relevant for your question.

On Fri, Dec 8, 2017 at 5:08 AM, Wouter Klouwen 
wrote:

> Hi all,
>
> In trying to improve our build rules, one of the problems I encountered
> is that I effectively have some source files that cannot be compiled
> unless certain targets are run.
>
> I noticed that cmSourceFile has the AddDepend() method, which looks to
> do the kind of thing that I want to do.
> cmFlTKWrapUICommand and cmCPluginAPI are the only users of this, with
> there being no way of setting this from a CMakeLists.txt.
> The former seems to do exactly the kind of think that I need, which is
> to set up some code generation.
>
> It would be nice if I could add items to this list, perhaps through
> setting a property on the source files themselves, e.g this rather
> contrived short example:
>
> add_custom_command(OUTPUT bar.h COMMAND touch bar.h)
> add_custom_target(bar DEPENDS generate_bar bar.h)
> set_source_files_properties(foo.cpp PROPERTIES DEPENDS bar)
>
> Is this a bad idea? Would there be a better way?
>
> Thanks,
> W
> This transmission contains information that may be confidential and
> contain personal views which are not necessarily those of YouView TV Ltd.
> YouView TV Ltd (Co No:7308805) is a limited liability company registered in
> England and Wales with its registered address at YouView TV Ltd, 3rd Floor,
> 10 Lower Thames Street, London, EC3R 6YT. For details see our web site at
> http://www.youview.com
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
>
> Visit other Kitware open-source projects at http://www.kitware.com/
> opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/cmake-developers
>



-- 
Craig Scott
Melbourne, Australia
https://crascit.com
-- 

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