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Sebastian Holtermann authored
`mocs_compilation.cpp` easily takes a long time to compile when it contains multiple `moc` files. When it was appended like before we ran into the situation that all smaller sources were already compiled when `mocs_compilation.cpp` got compiled at last. In that case a single core was busy but all remaining cores stayed idle. To optimize CPU core utilization we now prepend `mocs_compilation.cpp` to the sources list instead of appending it. This allows smaller source files to get compiled *while* the long lasting `mocs_compilation.cpp` gets compiled. Closes #18793
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