Re: In current gcc trunk: warning: dereferencing type-punned pointerwill break strict-aliasing rules

[Nathan Sidwell <nathan at codesourcery dot com>]

Christian Joensson wrote:
> I'd just like to ask if this is noticed:
>
> /usr/local/src/trunk/gcc/gcc/unwind-dw2.c:324: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/src/trunk/gcc/gcc/unwind-dw2.c:789: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/src/trunk/gcc/gcc/unwind-dw2.c:1005: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/src/trunk/gcc/gcc/unwind-dw2-fde.c:1024: warning:
> dereferencing type-punned pointer will break strict-aliasing rules
> /usr/local/src/trunk/gcc/gcc/unwind-dw2-fde-glibc.c:393: warning:
> dereferencing type-punned pointer will break strict-aliasing rules

I had not noticed this, but looking at the first one it must have been caused by 
my patch to the type punning warning.  It also appears to be a correct warning, 
in that we are breaking aliasing.

I shall look for a solution.

nathan
--
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk