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From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
To: djgpp-workers AT delorie DOT com
Subject: Re: [patch] fix epunzip stric aliasing warnings
Date: Thu, 30 Jun 2011 22:55:35 +0200
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Reply-To: djgpp-workers AT delorie DOT com

Am Donnerstag, 30. Juni 2011 schrieb Ozkan Sezer:
[snip]
> >        * src/utils/djtar/epunzip.c (epunzip_read): Fix strict aaliasing warning.
> >        From Ozkan Sezer <sezeroz AT gmail DOT com>
> >
> 
> Just a note:  Replacing (int *) casts onto char buffers by (__dj_int_a *)
> is not necessary, as char* is already a may_alias type.
> EDIT: Even those (__dj_short_a *) can be simplified into (short *) casts,
> which I obviously missed doing in my initial version.  In any case, the
> result will be just the same but, IMO, the simplified ones will be easier
> to read.  Attached my 2nd version; pick as you like.


The only reason why I changed your patch was that when I compiled with gcc453
I got the following warnings::

C:/DJGPP-2.04/BIN/make.exe -C utils
gcc ... -c epunzip.c
epunzip.c: In function 'epunzip_read':
epunzip.c:161:7: warning: dereferencing type-punned pointer will break strict-aliasing rules
epunzip.c:167:7: warning: dereferencing type-punned pointer will break strict-aliasing rules
epunzip.c:173:7: warning: dereferencing type-punned pointer will break strict-aliasing rules
epunzip.c:179:7: warning: dereferencing type-punned pointer will break strict-aliasing rules
epunzip.c:285:8: warning: dereferencing type-punned pointer will break strict-aliasing rules
epunzip.c:296:8: warning: dereferencing type-punned pointer will break strict-aliasing rules
epunzip.c:302:8: warning: dereferencing type-punned pointer will break strict-aliasing rules
epunzip.c:308:8: warning: dereferencing type-punned pointer will break strict-aliasing rules
ld -s  ../../../lib/crt0.o djtar.o oread.o epunzip.o untar.o unzip.o unlzw.o unlzh.o unpack.o inflate.o crypt.o util.o zmethod.o unbzip2.o bzlib.o decompress.o huffman.o randtable.o crctable.o ../../../lib/libc.a -o ../../../bin/djtar.exe c:/djgpp-2.04/bin/../lib/gcc/djgpp/4.53/libgcc.a -T c:/djgpp-2.04/lib/djgpp.djl
../../../hostbin/stubify.exe ../../../bin/djtar.exe

Those warnings made reference to assigments like this one:
      timedate = *(int *)buffer;
so I changed it.  IIRC with gcc460 did not issued those warnings!!.

Regards,
Juan M. Guerrero