From owner-freebsd-bugs  Sun Aug 25 13:30: 6 2002
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Date: Sun, 25 Aug 2002 13:30:03 -0700 (PDT)
Message-Id: <200208252030.g7PKU33t071005@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
Cc: 
From: Matt Watson <mwatson@apple.com>
Subject: Re: bin/40209: __dtoa broken with -O2 or -O3 optimisation
Reply-To: Matt Watson <mwatson@apple.com>
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The following reply was made to PR bin/40209; it has been noted by GNATS.

From: Matt Watson <mwatson@apple.com>
To: freebsd-gnats-submit@FreeBSD.org, dan@obluda.cz
Cc:  
Subject: Re: bin/40209: __dtoa broken with -O2 or -O3 optimisation
Date: Sun, 25 Aug 2002 13:28:43 -0700

     226: #define word0(x) ((ULong *)&x)[1]
     227: #define word1(x) ((ULong *)&x)[0]
 
 This has always been non-conforming C, and is now causing problems due 
 to the default behavior of -fstrict-aliasing in recent GCC 
 distributions. C99 section 6.5 says:
 
         [#7] An object shall have its stored value accessed only  by
         an lvalue expression that has one of the following types:
 
         <list not including the above cast>
 
 You can use type-punning with a union to fix this, or use 
 -fno-strict-aliasing.
 
 matt.
 

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