Workaround cast warning of smaller integer type for __to_local

For now, guard the __to_local function for device compile only since a local pointer should be same size as unsigned int on GPU compile. Also change to void* instead of char*.

include/hip/hcc_detail/device_functions.h

@@ -734,6 +734,8 @@ int64_t __lanemask_lt()
     return ballot;
 }
 
+#ifdef __HIP_DEVICE_COMPILE__
+
 __device__
 inline
 void* __get_dynamicgroupbaseptr()
@@ -748,6 +750,8 @@ void *__amdgcn_get_dynamicgroupbaseptr() {
     return __get_dynamicgroupbaseptr();
 }
 
+#endif // __HIP_DEVICE_COMPILE__
+
 #endif // __HCC_OR_HIP_CLANG__
 
 #ifdef __HCC__

include/hip/hcc_detail/device_library_decls.h

@@ -45,7 +45,11 @@ extern "C" __device__ float __ocml_trunc_f32(float);
 
 // Introduce local address space
 #define __local __attribute__((address_space(3)))
-__device__ inline static __local char* __to_local(unsigned x) { return (__local char*)x; }
+
+#ifdef __HIP_DEVICE_COMPILE__
+__device__ inline static __local void* __to_local(unsigned x) { return (__local void*)x; }
+#endif //__HIP_DEVICE_COMPILE__
+
 extern "C" __device__ void* __local_to_generic(__local void* p);
 
 // __llvm_fence* functions from device-libs/irif/src/fence.ll