# ISPCFLAGS

New in version 3.19.

This is a CMake Environment Variable. Its initial value is taken from the calling process environment.

Default compilation flags to be used when compiling `ISPC` files. Will only be used by CMake on the first configuration to determine `ISPC` default compilation flags, after which the value for `ISPCFLAGS` is stored in the cache as `CMAKE_ISPC_FLAGS`. For any configuration run (including the first), the environment variable will be ignored if the `CMAKE_ISPC_FLAGS` variable is defined.

See also `CMAKE_ISPC_FLAGS_INIT`.