[Libvir] [PATCH] libvirt.c: warning: dereferencing type-punned pointer will break strict-aliasing rules

Richard W.M. Jones rjones at redhat.com
Fri Mar 2 11:30:12 UTC 2007

I'm currently trying to get libvirt to compile with -Werror.  One 
problem which came up early is the warning in $SUBJECT.  The gcc info 
page (see -fstrict-aliasing) is pretty unclear about what exactly causes 
this problem, so the attached patch rewrites the code quite 
conservatively to avoid the problem.


Emerging Technologies, Red Hat  http://et.redhat.com/~rjones/
64 Baker Street, London, W1U 7DF     Mobile: +44 7866 314 421
  "[Negative numbers] darken the very whole doctrines of the equations
  and make dark of the things which are in their nature excessively
  obvious and simple" (Francis Maseres FRS, mathematician, 1759)
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