[CMake] CPack Multicore Usage

[Chuck Atkins]

> > In calls to cpack only one core is used if Makefiles are used. Is there
> any option to enable multicore?
>

It depends on what your trying to achieve.  Typically the bottleneck for
CPack is in the compression step of the resulting tar (or rpm, etc.).  In
that case, CMake is limited by the libarchive, libz, libbz2, liblzma, etc.
implementations it's linked to, which are typically single threaded.  It's
really no different than taking an install tree and running "tar -czf
foo.tgz /path/t/foo-prefix".  So in that sense, even if you can
parallelizes the "temporary" install step where it collects the files to
packages, actually generating and compressing the package, which is the
costly part, will likely remain a single process.
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