[CMake] Parallel build setup question

[Cornelis Bockemühl]

Hello,

Somehow I seem to miss some crucial point regarding setup for parallel
build with CMake, so I would be happy if somebody can push me the last
few millimeters to hit my target!

My configuration is on OpenSuse Linux (Leap - 64-bit), working with
QtCreator and CMake, using the "make" configuration.

I learned from "the internet" that actually I would have to pass a -jN
option to make or gmake (with N being the max number of processors I
want to use). Or even more elegant: go for a -lN option to somehow
balance the load. Sounds good!

But what I do not see is how to pass these nice options to make through
CMake and QtCreator! One attempt was to specify CMAKE_CXX_FLAGS=-j4 or
the like because some comment "in the internet" seemed to suggest this.
However, like I already feared: this passes the option to the compiler
call - and that is the wrong address for it, so I get an error message.

Basically I think that it is 99% a CMake question and maximum 1% a
QtCreator problem, so I am asking this question here.

And now I am stuck - if not some friendly and knowing person can help
me out of this!

Thanks for any helpful hint!
Cornelis
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