[sldev] [VWR] gcc 4.1.2 and viewer 1.20.10

Kent Quirk (Q Linden) q at lindenlab.com
Thu Jun 26 07:19:09 PDT 2008


Yes, I *believe* that in this case that's equivalent to the  
constructor form (don't have my C++ reference handy), but it's an old  
style cast, which is often equivalent to reinterpret_cast and a bit of  
a blunt instrument. In general, using the constructor form or a C++- 
style cast is the preferred methodology these days.

	Q

On Jun 26, 2008, at 9:33 AM, Dana Fagerstrom wrote:

> I was getting the same problem with gcc 3.4!  I fixed it with:
>
>     (LLHTTPClient::ResponderPtr) this != mRegion- 
> >getHttpResponderPtr())
>
> D
>
> Kent Quirk (Q Linden) wrote:
>> Hi,
>> I'm deep in another branch right now, but from looking over the  
>> code briefly, I'm guessing that you're running into a problem  
>> comparing a smart pointer to a base class to a smart pointer to a  
>> subclass.
>> Instead of:
>>     this != LLViewerRegion::getHttpResponderPtr()
>> Please try:
>>     !(this == LLViewerRegion::getHttpResponderPtr())
>> If that fails, another option might be:
>>     LLHTTPClient::ResponderPtr(this) !=  
>> LLViewerRegion::getHttpResponderPtr()
>> These are boost::intrusive_ptr objects, so that last one should be  
>> safe.
>>    Q
>> On Jun 26, 2008, at 7:05 AM, Robin Cornelius wrote:
>>> Hi everyone,
>>>
>>> Having a gcc issue on 1.20.10 also reported on JIRA as VWR-7831.
>>>
>>> x86_64-linux-client-release/newview/llviewerregion.cpp:111: error:  
>>> no
>>> match for 'operator!=' in 'this !=
>>> LLViewerRegion::getHttpResponderPtr() const()'
>>>
>>> I'm assuming gcc 4.1.2 cannot handle the implicit casting required
>>> here. 4.1.3 and newer seems ok but this is a particular problem  
>>> for me
>>> as i need to build on 4.1.2 (the version in debian etch) to avoid a
>>> whole world of distribution issues with my viewer packages.
>>>
>>> Is the fix as simple as an explicit cast? or is gcc just deciding  
>>> the
>>> pointers are of different classes and as there is no = operator
>>> defined, balking at what it thinks it cannot do?
>>>
>>> Thanks for any help on this one!
>>>
>>> Robin
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