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* [Bug c/48414] New: Missing "uninitialized" warning in simple switch
@ 2011-04-02 15:05 sarbalap+gccbugzilla at gmail dot com
2012-10-24 21:55 ` [Bug c/48414] " ajv-198-093-0407 at vsta dot org
2012-10-24 22:05 ` manu at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: sarbalap+gccbugzilla at gmail dot com @ 2011-04-02 15:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48414
Summary: Missing "uninitialized" warning in simple switch
Product: gcc
Version: 4.5.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: sarbalap+gccbugzilla@gmail.com
Compiling the following code does not produce any warning, even if the "ret"
variable would be used uninitialized in most cases:
#include <stdio.h>
int main(void)
{
int ret;
printf("Input something: ");
fflush(stdout);
int c = getchar();
switch (c) {
case 'a':
ret = 0;
break;
default:
/* ret still uninitialized. */
break;
}
return ret;
}
Compiled with "gcc -Wall -o uninitialized uninitialized.c" under GCC 4.5.2.
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug c/48414] Missing "uninitialized" warning in simple switch 2011-04-02 15:05 [Bug c/48414] New: Missing "uninitialized" warning in simple switch sarbalap+gccbugzilla at gmail dot com @ 2012-10-24 21:55 ` ajv-198-093-0407 at vsta dot org 2012-10-24 22:05 ` manu at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: ajv-198-093-0407 at vsta dot org @ 2012-10-24 21:55 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48414 Andy Valencia <ajv-198-093-0407 at vsta dot org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ajv-198-093-0407 at vsta | |dot org --- Comment #1 from Andy Valencia <ajv-198-093-0407 at vsta dot org> 2012-10-24 21:54:59 UTC --- As of: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) the following code also does not get warned about the possibly uninitialized variable. I'm quite sure that gcc *used* to pick this up. int main(int argc, char **argv) { int c; if (argc > 1) { c = 1; } return(c); } ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/48414] Missing "uninitialized" warning in simple switch 2011-04-02 15:05 [Bug c/48414] New: Missing "uninitialized" warning in simple switch sarbalap+gccbugzilla at gmail dot com 2012-10-24 21:55 ` [Bug c/48414] " ajv-198-093-0407 at vsta dot org @ 2012-10-24 22:05 ` manu at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: manu at gcc dot gnu.org @ 2012-10-24 22:05 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48414 Manuel López-Ibáñez <manu at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |manu at gcc dot gnu.org Resolution| |DUPLICATE --- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-10-24 22:05:41 UTC --- This is constant propagation. Old issue. No fix in sight. *** This bug has been marked as a duplicate of bug 18501 *** ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2012-10-24 22:05 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-04-02 15:05 [Bug c/48414] New: Missing "uninitialized" warning in simple switch sarbalap+gccbugzilla at gmail dot com 2012-10-24 21:55 ` [Bug c/48414] " ajv-198-093-0407 at vsta dot org 2012-10-24 22:05 ` manu at gcc dot gnu.org
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