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Setting CMAKE_AUTOGEN_VERBOSE enables verbose output during
AUTOMOC, AUTOUIC and AUTORCC generation.
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By using a per .qrc lock file in AUTORCC, the same
`cmake -E cmake_autorcc ...` command can be called concurrently.
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This adds a dedicated mutex for file reading and writing to
cmQtAutoGenerator::FileSystem. The purpose of the change is
to avoid that long files reads block cmsys based path computations,
which are protected by an other mutex.
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Closes #17861
Closes #17862
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This was added separately in `cmCTestMultiProcessHandler` and
`cmQtAutoGenerator`. Factor out the duplicate code into a common header
for re-use.
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This introduces concurrent thread processing in the `_autogen`
target wich processes AUTOMOC and AUTOUIC.
Source file parsing is distributed among the threads by
using a job queue from which the threads pull new parse jobs.
Each thread might start an independent ``moc`` or ``uic`` process.
Altogether this roughly speeds up the AUTOMOC and AUTOUIC build
process by the number of physical CPUs on the host system.
The exact number of threads to start in the `_autogen` target
is controlled by the new AUTOGEN_PARALLEL target property which
is initialized by the new CMAKE_AUTOGEN_PARALLEL variable.
If AUTOGEN_PARALLEL is empty or unset (which is the default)
the thread count is set to the number of physical CPUs on
the host system.
The AUTOMOC/AUTOUIC generator and the AUTORCC generator are
refactored to use a libuv loop internally.
Closes #17422.
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Adds the new base class `cmQtAutoGenerator` which contains common
variables and methods used by `cmQtAutoGeneratorMocUic` and
`cmQtAutoGeneratorRcc`.
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