New in version 3.19.
This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Preferred executable for compiling
ISPC language files. Will only be used by CMake on the first configuration to determine
ISPC compiler, after which the value for
ISPC is stored in the cache as CMAKE_ISPC_COMPILER. For any configuration run (including the first), the environment variable will be ignored if the CMAKE_ISPC_COMPILER variable is defined.
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