Michal, why are you comiling with -fno-strict-aliasing? Any problems with C aliasing should IMO be reported as bugs and fixed quickly, because it causes trouble with other platforms and portabilty.
The warnings in your mail, which gcc and ast-open version did you use? I tested with Suse 12.1, gcc (SUSE Linux) 4.6.2, ast-open.2012-02-14 and only got this one warning src/lib/libast/vmalloc/vmstat.c: In function 'vmstat': src/lib/libast/vmalloc/vmstat.c:100:7: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] Olga On Tue, Feb 28, 2012 at 3:59 PM, Michal Hlavinka <[email protected]> wrote: > On 02/26/2012 01:29 PM, ольга крыжановская wrote: >> >> Glenn, I use a newer gcc version: gcc (SUSE Linux) 4.5.0 20100604 >> [gcc-4_5-branch revision 160292]. >> >> Can any one in the list confirm the warning with gcc>= 4.5? > > > We use -fno-strict-aliasing for ksh compilation. I've turned it off and got > this: > > src/lib/libast/vmalloc/vmbest.c:202:5: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmbest.c:440:4: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmbest.c:571:3: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmbest.c:682:3: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmbest.c:693:5: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmbest.c:694:5: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmopen.c:145:2: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmopen.c:150:2: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmopen.c:151:2: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmprivate.c:169:2: warning: dereferencing type-punned > pointer will break strict-aliasing rules > > src/lib/libast/vmalloc/vmstat.c:100:7: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libast/vmalloc/vmstat.c:102:7: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/lib/libsum/sum-sha2.c:743:2: warning: dereferencing type-punned pointer > will break strict-aliasing rules > src/lib/libsum/sum-sha2.c:1104:2: warning: dereferencing type-punned pointer > will break strict-aliasing rules > src/lib/libsum/sum-sha2.c:1105:2: warning: dereferencing type-punned pointer > will break strict-aliasing rules > src/cmd/ksh93/edit/emacs.c:1077:7: warning: dereferencing type-punned > pointer will break strict-aliasing rules > src/cmd/ksh93/edit/emacs.c:1079:7: warning: dereferencing type-punned > pointer will break strict-aliasing rules > > >> >> Olga >> >> On Sun, Feb 26, 2012 at 7:02 AM, Glenn Fowler<[email protected]> >> wrote: >>> >>> >>> I don;t see this with >>> gcc version 4.3.4 [gcc-4_3-branch revision 152973] (SUSE Linux) >>> >>> On Wed, 15 Feb 2012 23:32:38 +0100 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?= >>> wrote: >>>> >>>> Glenn, in libast's vmalloc I get this warning if I compile libast on >>>> Suse Linux with gcc4 and CCFLAGS='-O3 -flto -fstrict-aliasing >>>> -Wstrict-aliasing': src/lib/libast/vmalloc/vmstat.c:100:7: warning: >>>> dereferencing type-punned pointer will break strict-aliasing rules >>>> This appears to be the only aliasing related warning. >>> >>> >>>> Olga >>>> -- >>>> , _ _ , >>>> { \/`o;====- Olga Kryzhanovska -====;o`\/ } >>>> .----'-/`-/ [email protected] \-`\-'----. >>>> `'-..-| / http://twitter.com/fleyta \ |-..-'` >>>> /\/\ Solaris/BSD//C/C++ programmer /\/\ >>>> `--` `--` >>> >>> >>>> _______________________________________________ >>>> ast-developers mailing list >>>> [email protected] >>>> https://mailman.research.att.com/mailman/listinfo/ast-developers >>> >>> >> >> >> > > _______________________________________________ > ast-developers mailing list > [email protected] > https://mailman.research.att.com/mailman/listinfo/ast-developers -- , _ _ , { \/`o;====- Olga Kryzhanovska -====;o`\/ } .----'-/`-/ [email protected] \-`\-'----. `'-..-| / http://twitter.com/fleyta \ |-..-'` /\/\ Solaris/BSD//C/C++ programmer /\/\ `--` `--` _______________________________________________ ast-developers mailing list [email protected] https://mailman.research.att.com/mailman/listinfo/ast-developers
