cmake + all cpu cores

[KarelWintersky]

cmake --build . -j$(nproc --all)

will build release much faster

[magiblot]

Hi @KarelWintersky!

Yes, that's right. I guess you are referring to the sample code in the README? However, this argument is not portable. For example, it won't work on Windows if you are using the classic command prompt (since there is no nproc) or if MSBuild is being used (since CMake doesn't support -j for it).