[CMake] Adding explicit dependencies to a target

[Tarjei Knapstad]

Thanks a lot Petr, that solution works perfectly.

Regards,
--
Tarjei


On 8 May 2014 11:30, Petr Kmoch <petr.kmoch at gmail.com> wrote:

> Hi Tarjei.
>
> add_custom_command() has a DEPENDS argument where you can list any number
> of files which will act as dependencies for the custom command. So you
> could extend your custom command like this:
>
> add_custom_command(
>   OUTPUT ... #as before
>   COMMAND ... #as before
>   MAIN_DEPENDENCY a.idl
>   DEPENDS b.idl c.idl
>   ... # rest as before
> )
>
> You have to keep in mind that this gets processed at configure time - if
> you change the #include-s used in a.idl, you have to modify the CMakeList
> and re-run CMake to get the changes picked up.
>
> It should also be possible to use the IMPLICIT_DEPENDS argument of
> add_custom_command() to request the C or C++ dependency scanner to run on
> the file, moving the dependency detection to build time. But that only
> works for Makefile generators.
>
> Petr
>
>
> On Thu, May 8, 2014 at 9:16 AM, Tarjei Knapstad <tarjei.knapstad at gmail.com
> > wrote:
>
>> In our project we are generating code from CORBA IDL files by adding a
>> custom command that generates C++ code from the IDL files and a library
>> target that depends on the generated output. This works as expected,
>> however IDL supports include directives which are (naturally) not picked up
>> as dependencies by CMake. To give an example:
>>
>> a.idl:
>> --------------------
>> #include "b.idl"
>> #include "c.idl"
>> ---------------------
>>
>> Here the file a.idl file includes b.idl and c.idl. The file a.idl is
>> given as input to the custom command that processes IDL files into C++, but
>> if I change b.idl or c.idl then the target is not rebuilt. Is it possible
>> to add b.idl and c.idl as explicit dependencies in some way so that my
>> target is rebuilt if these files change? I've made various attempts with
>> add_custom_target() and add_dependencies() as well as
>> set_source_files_properties() without any luck.
>>
>> Regards,
>> --
>> Tarjei
>>
>> --
>>
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