cmake parallel make problem.

[Petr Machata]

Richard Shaw <hobbes1069 at gmail.com> writes:

> On Tue, Jan 10, 2012 at 8:18 AM, Rex Dieter <rdieter at math.unl.edu> wrote:
>> Richard Shaw wrote:
>>
>>> I've gone through the CMakeLists.txt and added "add_dependencies(..."
>>> but I think that's redundant because target_link_libraries is getting
>>> set properly.
>>
>> I'm not sure this is redundant, as I would imaging it would be hard to infer
>> the origin of the target_link_library (ie, if it's local or not).
>
> Do you mean this could be a scope issue? From what I gathered reading
> the cmake documentation, add_dependencies was most useful for custom
> and external targets. Everything builds fine if I force "-j1" so I
> think it's trying to build things in the right order. Perhaps one job
> is finishing before another and it just doesn't understand it needs to
> wait for another job to finish?

I didn't look into your problem, but what you say would mean that cmake
is not generating all necessary dependencies for make.  Having a rule
like "X: Y Z" is not enough.  If Z depends on Y, you need additionally
"Z: Y", otherwise make will parallelize Y and Z.

Thanks,
PM