JOB_POOL_COMPILE
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Cmake/docs/3.21/prop tgt/job pool compile
JOB_POOL_COMPILE
Ninja only: Pool used for compiling.
The number of parallel compile processes could be limited by defining pools with the global JOB_POOLS property and then specifying here the pool name.
For instance:
set_property(TARGET myexe PROPERTY JOB_POOL_COMPILE ten_jobs)
This property is initialized by the value of CMAKE_JOB_POOL_COMPILE.
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https://cmake.org/cmake/help/v3.21/prop_tgt/JOB_POOL_COMPILE.html