[CMake] What triggers CMake to scan (C) files for dependencies?

[Arjen Markus]

Hello,

I think I found the answer: it is only when actually building the
program that the source files get scanned and therefore the depend.make
file gets filled. That, of course, does make sense.

Regards,

Arjen

On 2010-09-23 10:18, Arjen Markus wrote:
> Hello,
> 
> I am trying to create CMake-based build system for a program
> that uses both C and Fortran source files. While expanding the
> CMakeLists.txt files to include a custom build step for one
> C header file, I stumbled on something I do not understand.
> 
> The makefiles generated from my first versions did not seem to
> include any dependencies from #include (the file "depend.make" was
> simply a dummy).
> 
> When I added my custom build step, I had great difficulty to get
> the dependencies right. The file "depend.make" remained empty.
> Then I added a call to set_source_files_properties() to explicitly
> set the dependency on that one header file and now I see that
> _all_ C files in the project are listed there.
> 
> So, my question: is it the set_source_files_properties() command
> that turns on this scanning? Is there a more explicit way (I want
> to have this scanning turned on regardless of any explicit
> dependencies I need).
> 
> I am using CMake 2.8
> 
> Regards,
> 
> Arjen
> 
> 
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