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From: "torger at ludd dot luth dot se" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/18426] New: -Wstrict-aliasing fails to report simple case of breaking strict aliasing rules Date: Thu, 11 Nov 2004 06:32:00 -0000 [thread overview] Message-ID: <20041111063228.18426.torger@ludd.luth.se> (raw) /* x86 platform. This simple program with the obvious breaking of strict aliasing rules does not generate a warning with -Wstrict-aliasing gcc -Wall -Wstrict-aliasing test.c tested on Pentium 4 gcc 3.4.2, gcc 3.3.5 and gcc 3.2.3, as built for debian unstable 2004 Nov 9 */ #include <stdio.h> unsigned long hash(void *key) { unsigned long long u[1]; u[0] = *(unsigned long long *)key; return ((unsigned long *)u)[0] ^ ((unsigned long *)u)[1]; } int main(void) { unsigned long long ull; ull = 0xDEADBEAF; fprintf(stderr, "%08lX\n", hash(&ull)); return 0; } -- Summary: -Wstrict-aliasing fails to report simple case of breaking strict aliasing rules Product: gcc Version: 3.4.2 Status: UNCONFIRMED Severity: minor Priority: P2 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: torger at ludd dot luth dot se CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18426
next reply other threads:[~2004-11-11 6:32 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-11-11 6:32 torger at ludd dot luth dot se [this message] 2004-11-11 6:35 ` [Bug c/18426] " pinskia at gcc dot gnu dot org 2004-11-11 12:33 ` giovannibajo at libero dot it 2005-09-18 1:40 ` pinskia at gcc dot gnu dot org
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