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* [Bug c/50590] New: Initializing a variable to itself yields garbage/UB and no warning.
@ 2011-10-02 16:27 eyal.lotem at gmail dot com
2011-10-02 16:43 ` [Bug c/50590] " schwab@linux-m68k.org
0 siblings, 1 reply; 2+ messages in thread
From: eyal.lotem at gmail dot com @ 2011-10-02 16:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50590
Bug #: 50590
Summary: Initializing a variable to itself yields garbage/UB
and no warning.
Classification: Unclassified
Product: gcc
Version: 4.5.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: eyal.lotem@gmail.com
Exact version string:
gcc (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2
This is very similar to: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10538
But weirdly, while:
int x = x + 1;
Does yield a warning, this:
int x = x;
does not.
This may accidentally happen in e.g macros:
#define F(_x) \
int _x = x;
... use _x ...
expands to:
int x = x;
use x;
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c/50590] Initializing a variable to itself yields garbage/UB and no warning.
2011-10-02 16:27 [Bug c/50590] New: Initializing a variable to itself yields garbage/UB and no warning eyal.lotem at gmail dot com
@ 2011-10-02 16:43 ` schwab@linux-m68k.org
0 siblings, 0 replies; 2+ messages in thread
From: schwab@linux-m68k.org @ 2011-10-02 16:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50590
Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2011-10-02 16:43:09 UTC ---
This is a feature, use -Winit-self.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-10-02 16:27 [Bug c/50590] New: Initializing a variable to itself yields garbage/UB and no warning eyal.lotem at gmail dot com
2011-10-02 16:43 ` [Bug c/50590] " schwab@linux-m68k.org
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