[Bug tree-optimization/36679] New: lnstat command dies if built with O1/O2

["shemminger at vyatta dot com" <gcc-bugzilla at gcc dot gnu dot org>]

The GCC optimizer generates code that cause a segmentation violation in
snprintf if the lnstat command from iproute2 utilities is build with -O1 or
-O2.

System: Intel Core Duo (64 bit)
Version: gcc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7)


Backtrace:
]$ gdb ./lnstat
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu"...
(gdb) run
Starting program: /home/shemminger/src/iproute2/misc/lnstat 

Program received signal SIGSEGV, Segmentation fault.
0x00007f81a655c9d4 in vsnprintf () from /lib/libc.so.6
(gdb) where
#0  0x00007f81a655c9d4 in vsnprintf () from /lib/libc.so.6
#1  0x00007f81a653ef73 in snprintf () from /lib/libc.so.6
#2  0x00000000004015f3 in main ()


-- 
           Summary: lnstat command dies if built with O1/O2
           Product: gcc
           Version: 4.2.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: shemminger at vyatta dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36679