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Sebastian Holtermann authored
Instead of processing all `rcc` invocation requests in the _autogen target that calls `cmake -E cmake_autogen ...` once, use a dedicated custom command that calls `cmake -E cmake_autorcc ...` for each `.qrc` file. This allows parallel `.qrc` file processing and reduces the workload (and complexity) in the _autogen target. If only `AUTORCC` is enabled, the _autogen target won't be created at all since it is now used for `AUTOMOC` and `AUTOUIC` only. For `.qrc` files that are GENERATED a custom target is used instead of a custom command. Closes #17161
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