CMAKE_ISPC_HEADER_DIRECTORY

From Get docs
Cmake/docs/3.21/variable/cmake ispc header directory


CMAKE_ISPC_HEADER_DIRECTORY

New in version 3.19.


ISPC generated header output directory.

This variable is used to initialize the ISPC_HEADER_DIRECTORY property on all the targets. See the target property for additional information.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/variable/CMAKE_ISPC_HEADER_DIRECTORY.html