Re: GCC warnings compiling mib2c output

2009/9/14 Christopher Nelson <[email protected]>:
>   Recently, we upgraded compilers and we're seeing a lot of
> warnings about "dereferencing type-punned pointer will break
> strict-aliasing rules"

Well, the warning is technically correct.
The memdup call *does* re-cast these pointers in a potentially
non-safe manner.   But memdup is working with raw memory,
so this isn't really a problem.

I suppose you could consider tweaking the call to use 'void' rather
than 'char' pointers.   In retrospect, that would have been a better
choice, and might keep your compiler happy.   But note that this
change would have to be applied throughout the whole codebase.

   I'm not sure whether this is something we would be prepared to
do for the standard distributions.   Particularly since it would
presumably impact on third-party code.   Wes - care to comment?

We might also need to consider changing the name at some point
(?to netsnmp_memdup) since a number of other packages also
define a routine "memdup".   Often with a different API template
(typically returning the new buffer as the result of the call, rather
than passing this via the first parameter).
   Again, I'm not sure why we went the way we did, but it's probably
too late to change now.


Dave

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