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* [Bug c++/23915] New: Missing -Wstrict-aliasing warning
@ 2005-09-16 12:01 larschri at pvv dot ntnu dot no
2005-09-16 13:25 ` [Bug c++/23915] " bangerth at dealii dot org
2005-09-16 14:15 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: larschri at pvv dot ntnu dot no @ 2005-09-16 12:01 UTC (permalink / raw)
To: gcc-bugs
I get warning when compiling the following program as C, but not as C++. I have
experienced that such casts can fail for both C and C++ programs when running
with option -O2. See also [Bug c/23913].
int main() {
float f = 4.5;
int i = *((int*)&f);
(void)i;
return 0;
}
$ g++ -Wstrict-aliasing -O2 foo.cpp
$ g++ --version
g++ (GCC) 4.0.1 20050727 (Red Hat 4.0.1-5)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc -Wstrict-aliasing -O2 foo.c
cast-bug.c: In function 'main':
cast-bug.c:5: warning: dereferencing type-punned pointer will break
strict-aliasing rules
--
Summary: Missing -Wstrict-aliasing warning
Product: gcc
Version: 4.0.1
Status: UNCONFIRMED
Severity: enhancement
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: larschri at pvv dot ntnu dot no
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23915
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/23915] Missing -Wstrict-aliasing warning
2005-09-16 12:01 [Bug c++/23915] New: Missing -Wstrict-aliasing warning larschri at pvv dot ntnu dot no
@ 2005-09-16 13:25 ` bangerth at dealii dot org
2005-09-16 14:15 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: bangerth at dealii dot org @ 2005-09-16 13:25 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bangerth at dealii dot org 2005-09-16 13:25 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Keywords| |diagnostic
Last reconfirmed|0000-00-00 00:00:00 |2005-09-16 13:25:05
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23915
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/23915] Missing -Wstrict-aliasing warning
2005-09-16 12:01 [Bug c++/23915] New: Missing -Wstrict-aliasing warning larschri at pvv dot ntnu dot no
2005-09-16 13:25 ` [Bug c++/23915] " bangerth at dealii dot org
@ 2005-09-16 14:15 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-16 14:15 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-16 14:14 -------
This really a dup of bug 14024.
*** This bug has been marked as a duplicate of 14024 ***
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23915
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-09-16 14:15 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2005-09-16 12:01 [Bug c++/23915] New: Missing -Wstrict-aliasing warning larschri at pvv dot ntnu dot no
2005-09-16 13:25 ` [Bug c++/23915] " bangerth at dealii dot org
2005-09-16 14:15 ` pinskia at gcc dot gnu dot org
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