[cfe-dev] warnings in clang

[Argiris Kirtzidis]

Sebastian Redl wrote:
> Argiris Kirtzidis wrote:
>> Here's a similar case, doesn't gcc has a problem with this ?
>>
>>   template <typename T>
>>   void ReadPtr(T*& PtrRef, const SerializedPtrID& PtrID,
>>                bool AllowBackpatch = true) {
>>     ReadUIntPtr(reinterpret_cast<uintptr_t&>(PtrRef), PtrID, 
>> AllowBackpatch);
>>   }
>>   
> It's a trick to avoid GCC's warning. Because the function takes a 
> reference and passes a reference on, the type-punned "pointer" 
> (reference, actually) is never "dereferenced" (accessed). The actual 
> ReadUIntPtr accesses it, but by then GCC has forgotten the original type.

What's the difference with

   D.ReadUIntPtr(reinterpret_cast<uintptr_t&>(MDC->SemanticDC), 
SemaDCPtrID);

The type-punned pointer is never dereferenced either.