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* [Bug c/39748] New: possible bogus offset warning
@ 2009-04-13 9:22 dcb314 at hotmail dot com
2009-04-13 9:24 ` [Bug c/39748] " dcb314 at hotmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: dcb314 at hotmail dot com @ 2009-04-13 9:22 UTC (permalink / raw)
To: gcc-bugs
I just tried to compile the popular bzip2 package
with the GNU gcc version 4.5 snapshot 20090409.
The compiler said
bzlib.c: In function 'bzopen_or_bzdopen':
bzlib.c:1443: warning: offset '2' outside bounds of constant string
bzlib.c:1443: warning: offset '3' outside bounds of constant string
The source code is
if (path==NULL || strcmp(path,"")==0) {
This looks like a bogus warning to me.
Preprocessed source code attached. No special flags required.
--
Summary: possible bogus offset warning
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dcb314 at hotmail dot com
GCC host triplet: x86_64-suse-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39748
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug c/39748] possible bogus offset warning 2009-04-13 9:22 [Bug c/39748] New: possible bogus offset warning dcb314 at hotmail dot com @ 2009-04-13 9:24 ` dcb314 at hotmail dot com 2009-04-14 14:47 ` [Bug c/39748] [4.5 regression] warning "outside bounds of constant string" not suppressed in dead code falk at debian dot org 2009-04-14 14:51 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: dcb314 at hotmail dot com @ 2009-04-13 9:24 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from dcb314 at hotmail dot com 2009-04-13 09:23 ------- Created an attachment (id=17624) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17624&action=view) C source code -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39748 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/39748] [4.5 regression] warning "outside bounds of constant string" not suppressed in dead code 2009-04-13 9:22 [Bug c/39748] New: possible bogus offset warning dcb314 at hotmail dot com 2009-04-13 9:24 ` [Bug c/39748] " dcb314 at hotmail dot com @ 2009-04-14 14:47 ` falk at debian dot org 2009-04-14 14:51 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: falk at debian dot org @ 2009-04-14 14:47 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from falk at debian dot org 2009-04-14 14:47 ------- The problem comes from some convoluted code that was apparently substituted for strlen to special-case constant arguments. It boils down to: int f(void) { if (0) return ((const char *) "")[2]; return 0; } (without the cast, no warning is given). -- falk at debian dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Keywords| |diagnostic Known to fail| |4.5.0 Known to work| |4.4.0 Summary|possible bogus offset |[4.5 regression] warning |warning |"outside bounds of constant | |string" not suppressed in | |dead code http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39748 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/39748] [4.5 regression] warning "outside bounds of constant string" not suppressed in dead code 2009-04-13 9:22 [Bug c/39748] New: possible bogus offset warning dcb314 at hotmail dot com 2009-04-13 9:24 ` [Bug c/39748] " dcb314 at hotmail dot com 2009-04-14 14:47 ` [Bug c/39748] [4.5 regression] warning "outside bounds of constant string" not suppressed in dead code falk at debian dot org @ 2009-04-14 14:51 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2009-04-14 14:51 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from pinskia at gcc dot gnu dot org 2009-04-14 14:50 ------- *** This bug has been marked as a duplicate of 35652 *** -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39748 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-04-14 14:51 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2009-04-13 9:22 [Bug c/39748] New: possible bogus offset warning dcb314 at hotmail dot com 2009-04-13 9:24 ` [Bug c/39748] " dcb314 at hotmail dot com 2009-04-14 14:47 ` [Bug c/39748] [4.5 regression] warning "outside bounds of constant string" not suppressed in dead code falk at debian dot org 2009-04-14 14:51 ` pinskia at gcc dot gnu dot org
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