[CMake] What is --build-two-config good for

[Torsten at Robitzki.de]

Hi Robert,

> Am 06.12.2018 um 15:26 schrieb Robert Maynard <robert.maynard at kitware.com>:
> 
> It is possible to have CMake projects where an initial configuration of the project is insufficient for it to be in a valid state. This is generally caused by a project which evaluates variables before they exist and saved into the cache. By running CMake a second time for these projects the evaluation works ‚as intended' at the build is the correct state.

thanks for the explanation!

regards,

Torsten
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