[C++-sig] Tiny fix to the FAQ please

[Niall Douglas]

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In the FAQ "How do I handle void * conversion?" a tiny thing needs 
changing. Instead of declaring void_ as struct void_; you should use:

struct void_ {};

This is due to a bug in GCC whereby corrupted typeinfo can be emitted 
for undefined types. Unfortunately it only happens in my 60Mb shared 
object ie; truly massive linking & relocation requirements and thus I 
can't condense down an example for reporting. However, the simple 
trick above works fine.

Cheers,
Niall





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