Creates a separate device code module for each SYCL* kernel. Each device code module will contain a kernel and all its dependencies, such as called functions and used variables.

Creates a separate device code module for each source (translation unit).

Each device code module will contain a collection of kernels grouped on per-source basis and all their dependencies, such as all used variables and called functions, including the SYCL_EXTERNAL macro-marked functions from other translation units.

Creates a single module for all kernels.

The compiler will use a heuristic to select the best way of splitting device code. This is the same as specifying

fsycl-device-code-split

with no value.