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* [Bug c/37148] New: -Wunintialized fails in the face of conditional assignment.
@ 2008-08-18 13:32 thutt at vmware dot com
2008-08-18 13:47 ` [Bug c/37148] -Wunintialized fails in the face of conditional initialization manu at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: thutt at vmware dot com @ 2008-08-18 13:32 UTC (permalink / raw)
To: gcc-bugs
Although I demonstrated this using 4.1.2 on my host, it probably affects
other versions as well.
As the following code shows:
gcc -c -O1 -Wall -Werror uninitialized-warning.c
extern void called_function(unsigned p);
extern unsigned g;
void
f0(unsigned parm)
{
unsigned v;
if (parm == 0) {
v = 4;
}
called_function(v);
}
void
f1(unsigned parm)
{
unsigned v;
if (parm == 0) {
v = 4;
} else {
g = 0;
}
called_function(v);
}
void
f2(unsigned parm)
{
unsigned v;
called_function(v);
}
gcc does not produce the 'uninitialized' warning when the automatic
variable is conditionally assigned.
This gives a very bad false sense of security that the automatic
variables are indeed initialized.
--
Summary: -Wunintialized fails in the face of conditional
assignment.
Product: gcc
Version: 4.1.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: thutt at vmware dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37148
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c/37148] -Wunintialized fails in the face of conditional initialization.
2008-08-18 13:32 [Bug c/37148] New: -Wunintialized fails in the face of conditional assignment thutt at vmware dot com
@ 2008-08-18 13:47 ` manu at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: manu at gcc dot gnu dot org @ 2008-08-18 13:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from manu at gcc dot gnu dot org 2008-08-18 13:46 -------
CCP removes the uninitialized use.
*** This bug has been marked as a duplicate of 18501 ***
--
manu at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manu at gcc dot gnu dot org
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37148
^ permalink raw reply [flat|nested] 2+ messages in thread
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2008-08-18 13:32 [Bug c/37148] New: -Wunintialized fails in the face of conditional assignment thutt at vmware dot com
2008-08-18 13:47 ` [Bug c/37148] -Wunintialized fails in the face of conditional initialization manu at gcc dot gnu dot org
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