[CMake] cmake + ninja how to use several CPU cores?

[Alan W. Irwin]

On 2019-07-29 15:32-0400 Brad King wrote:

> [...]We don't know what `main.cpp` includes
> until after compiling it, by which point it is too late.  It could have
> `#include "anything.txt"` for example.  CMake must add these pessimistic
> dependencies to ensure a correct build.

Is this the real reason why even the simplest
no_custom_add_internal_library project (with nothing custom at all)
still demonstrates the issue?

Alan
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Alan W. Irwin

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.org); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
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Linux-powered Science
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