Is this a duplicate?

• I confirmed there appear to be no duplicate issues for this request and that I agree to the Code of Conduct

Area

General CCCL

Is your feature request related to a problem? Please describe.

We are extending freestanding mode support from device-only sources to host sources as well (see #7743). To validate this work end-to-end, we need test infrastructure capable of compiling and executing representative freestanding inputs without relying on system headers. We should first bring in the minimal compiler infrastructure needed to support freestanding-mode testing for host + device source combinations.

Describe the solution you'd like

Merge the compiler infrastructure from the https://github.com/gevtushenko/cccl/tree/freestanding branch. This should be introduced strictly for testing freestanding behavior and should not be linked into or otherwise affect production binaries. This issue can be closed once we have a freestanding compiler test that can build and run a source like:

std::string source = R"(
__global__ void device(int* ptr) {
  *ptr = 42;
}
void host(int* ptr) {
  device<<<1, 1>>>(ptr);
}
)";

Describe alternatives you've considered

No response

Additional context

No response