[CMake] Parallel Processes in CMake

[Tobias Becker]

Hi

 I Implemented support for parallel processes based on bash xor powershell.
If you have long running processes in CMake you might want to check it out
and try it at http://thetoeb.de/2014/12/16/parallel-processes-cmake/  resp.
https://github.com/toeb/oo-cmake


the gist ist:
```
# these to processes run concurrently
start_process(COMMAND ping cmake.org)
ans(handle1)
start_process(COMMAND ping github.org)
ans(handle2)

set(handles ${handle1} ${handle2})
## waits until all processes are terminated
process_wait_all(${handles})

## prints the standard output stream of both processes to the console
foreach(handle ${handles}
 process_stdout(${handle})
 ans(stdout)

 message(STATUS "${stdout})
endforeach()
```

Tell me if you like it (or if you don't want me to shamelessly plug my Blog
posts on this mailing list) :)


Cheers!

Tobias
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