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FYI: GCC warnings about strict-aliasing violation in glibc

From: Andreas Jaeger <aj at suse dot de>
To: GNU libc hacker <libc-hacker at sources dot redhat dot com>
Date: Sun, 10 Nov 2002 10:10:52 +0100
Subject: FYI: GCC warnings about strict-aliasing violation in glibc
I got the appended warnings (just a quick grep) about violation of
strict-aliasing rules with a GCC 3.3 CVS compiler.  The majority comes
from the NSS code.  I suggest to get these fixed and will work on some
of them myself,

Andreas

wctob.c:65: warning: dereferencing type-punned pointer will break strict-aliasing rules
wcsrtombs.c:85: warning: dereferencing type-punned pointer will break strict-aliasing rules
wcsnrtombs.c:88: warning: dereferencing type-punned pointer will break strict-aliasing rules
wctob.c:65: warning: dereferencing type-punned pointer will break strict-aliasing rules
wcsrtombs.c:85: warning: dereferencing type-punned pointer will break strict-aliasing rules
wcsnrtombs.c:88: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../sysdeps/unix/sysv/linux/getsysstats.c:88: warning: dereferencing type-punned pointer will break strict-aliasing rules
../sysdeps/unix/sysv/linux/getsysstats.c:88: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:68: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:80: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:107: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:117: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:150: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:171: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:183: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:68: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:80: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:107: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:117: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:150: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:171: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnssent_r.c:183: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_hton.c:49: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_hton.c:70: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_ntoh.c:50: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_ntoh.c:71: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:105: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:111: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:168: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:175: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:209: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:265: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:318: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:330: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:392: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:397: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_hton.c:49: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_hton.c:70: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_ntoh.c:50: warning: dereferencing type-punned pointer will break strict-aliasing rules
ether_ntoh.c:71: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:105: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:111: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:168: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:175: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:209: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:265: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:318: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:330: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:392: warning: dereferencing type-punned pointer will break strict-aliasing rules
getnetgrent_r.c:397: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXent.c:82: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:51: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:70: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:90: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:109: warning: dereferencing type-punned pointer will break strict-aliasing rules
netname.c:156: warning: dereferencing type-punned pointer will break strict-aliasing rules
netname.c:175: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:51: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:70: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:90: warning: dereferencing type-punned pointer will break strict-aliasing rules
publickey.c:109: warning: dereferencing type-punned pointer will break strict-aliasing rules
netname.c:156: warning: dereferencing type-punned pointer will break strict-aliasing rules
netname.c:175: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:612: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:629: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:948: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:984: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:1173: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:1328: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:3048: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:3311: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:3320: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:3337: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:3522: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:3576: warning: dereferencing type-punned pointer will break strict-aliasing rules
programs/ld-collate.c:3584: warning: dereferencing type-punned pointer will break strict-aliasing rules
gethnamaddr.c:622: warning: dereferencing type-punned pointer will break strict-aliasing rules
gethnamaddr.c:712: warning: dereferencing type-punned pointer will break strict-aliasing rules
gethnamaddr.c:717: warning: dereferencing type-punned pointer will break strict-aliasing rules
res_send.c:565: warning: dereferencing type-punned pointer will break strict-aliasing rules
gethnamaddr.c:622: warning: dereferencing type-punned pointer will break strict-aliasing rules
gethnamaddr.c:712: warning: dereferencing type-punned pointer will break strict-aliasing rules
gethnamaddr.c:717: warning: dereferencing type-punned pointer will break strict-aliasing rules
res_send.c:565: warning: dereferencing type-punned pointer will break strict-aliasing rules
nss_dns/dns-host.c:176: warning: dereferencing type-punned pointer will break strict-aliasing rules
nss_dns/dns-host.c:193: warning: dereferencing type-punned pointer will break strict-aliasing rules
nss_dns/dns-host.c:311: warning: dereferencing type-punned pointer will break strict-aliasing rules
nss_dns/dns-host.c:317: warning: dereferencing type-punned pointer will break strict-aliasing rules
nss_dns/dns-network.c:126: warning: dereferencing type-punned pointer will break strict-aliasing rules
nss_dns/dns-network.c:196: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:178: warning: dereferencing type-punned pointer will break strict-aliasing rules
../nss/getXXbyYY_r.c:230: warning: dereferencing type-punned pointer will break strict-aliasing rules

-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
    http://www.suse.de/~aj
Follow-Ups:
- Re: FYI: GCC warnings about strict-aliasing violation in glibc
  - From: Andreas Jaeger
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