func _Cfunc_sin(p0 _Ctype_double) (r1 _Ctype_double) {
		_cgo_runtime_cgocall(_cgo_gcc_Cfunc_sin, uintptr(unsafe.Pointer(&p0)))
		return
	}

	// compiled by gcc, into foo.cgo2.o

	void
	_cgo_gcc_Cfunc_sin(void *v)
	{
		struct {
			double p0;
			double r;
		} __attribute__((__packed__)) *a = v;
		a->r = sin(a->p0);
	}