[CMake] cmake_check_build_system is causing a rebuild at "make install"

[James Bigler]

The cpp file dependency is generator specific.  CMake supports cpp file
dependency for Makefiles only.  The solution we have works for any
generator.

The dependencies could be generated at configure time, and I have a local
version used internally where I work that does this, but it's not a
cure-all.

This is a complex issue that I've gone into in the past on the list.  I
hope at some future point this can be made better.

On Mon, Oct 19, 2015 at 10:55 AM JR Cary <cary at txcorp.com> wrote:

> Thanks for the response, James.  Our workaround finally
> was to do "make install/fast".
>
> A colleague pointed out that there is a bug report,
> https://cmake.org/Bug/view.php?id=15801,
> likely related to this.
>
> Is there something about CUDA that requires dependency generation
> at build time?  (I am used to the standard of "#include <foo>" following
> that can be done before any build.)
>
> It would be nice if the CUDA dependency generation worked like regular
> cpp file dependency generation so that cmake would be run only upon
> change of files and that otherwise it did not have to be turned off
> completely.
>
> Thanks!
>
> ....John
>
> On 10/18/15 10:03 PM, James Bigler wrote:
>
> This could be caused by CUDA generating dependencies and then needing to
> load them at the next configure step.
>
> For our automated builds, where we don't rely on dependencies during
> development (e.g. build one main target from scratch then throw it away),
> we set the CMAKE_SUPPRESS_REGENERATION option to TRUE.  This will prevent
> CMake from configuring during the build.  You can still configure manually
> by running cmake.
>
> James
>
> On Wed, Oct 14, 2015 at 7:04 AM, Nils Gladitz <nilsgladitz at gmail.com>
> wrote:
>
>> On 14.10.2015 14:51, JR Cary wrote:
>>
>>> Thanks for your response.  This is a big headache for us, as it slows
>>> down
>>> our builds tremendously.
>>>
>>> Is there any way to prevent or control this behavior?
>>>
>>
>> I don't see how. You could modify the module itself I suppose but I'd
>> expect that to break incremental builds.
>>
>>
>> Nils
>> --
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