Re: "size of symbol changed" warnings -- what do these mean?

[andy at softbokpress dot com]

I saw this when I was using  -g  and  -frepo options ( on a Netwinder Linux box )
The error went away when I changed the order of the options in my makefile
Andy

Kenneth Streeter wrote:

> We are getting some unusual warning messages from the WRS
> Tornado II version of the g++ compiler, and are hoping that
> somebody here could explain in layman's terms what specifically
> these messages mean.  We are getting the errors in compiling
> the ACE 3rd party library, which contains tens of thousands of
> lines of code and we are having difficulty even knowing where
> to start.  Knowing exactly what the linker warning we are getting
> means would be a big help.
>
> Here is the linker output:
>
>   Warning: size of symbol
>   `dequeue__t17ACE_Message_Queue1Z14ACE_NULL_SYNCHRP17ACE_Message_BlockP14ACE_Time_Value'
>   changed from 56 to 52 in Message_Queue.o
>
>   Warning: size of symbol `activate__t17ACE_Message_Queue1Z14ACE_NULL_SYNCH' changed from
>   56 to 52 in Message_Queue.o
>
> The symbols that the linker is actually complaining about are
> function names.  The demangled function names are as follows:
>
>   ACE_Message_Queue<ACE_NULL_SYNCH>::dequeue (ACE_Message_Block *&,
>                                               ACE_Time_Value *)
>
>   ACE_Message_Queue<ACE_NULL_SYNCH>::activate (void)
>
> What do the "changed from 56 to 52" statements mean?  If we knew what
> was of size 56 and changed to size 52, we might have a possibility of
> tracking this error down and fixing it.  (We are concerned about fixing
> this, as we seem to be suffering from memory corruption when using
> Message_Queues in the resulting executables.)
>
> We are using the Tornado II version of the linker on Solaris
> for PPC targets.  (g++ppc cygnus-2.7.2-960126)
>
> Any help or suggestions you could provide would be greatly appreciated.
>
> --ken
>
> --
> Kenneth B. Streeter     | EMAIL: kenneth.b.streeter@lmco.com
> BAE SYSTEMS, MER15-2415 |
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