[Bug c++/29529] New: purify with iostream reports 128 uninitialized memory reads

[mstaley at lanl dot gov]

When I compile this code:

   #include <iostream>
   int main(void)
   {
   }

with g++, instrumented with the "purify" utility, purify reports
the following:

   UMR: Uninitialized memory read (128 times)
   This is occurring while in:
         __gconv_get_alias_db [libc.so.6]
         wctob          [libc.so.6]
         std::ctype< wchar_t>::_M_initialize_ctype( void) [libstdc++.so.6]
         std::ctype< wchar_t>::ctype( unsigned) [libstdc++.so.6]
         std::locale::_Impl::_Impl( unsigned) [libstdc++.so.6]
         std::locale::_Impl::_Impl( unsigned) [libstdc++.so.6]
   Reading 4 bytes from 0xbfa77a24 on the stack.
   Address 0xbfa77a24 is       84 bytes below frame pointer in function wctob

Dunno if this is a g++ problem, purify problem, OS problem, system
library problem, not really an error, or whatever, but it would be
nice to make it go away.

System/compiler info:

   uname -a
      Linux banat 2.6.15-26-686 #1 SMP PREEMPT Mon Jul 17 20:14:14 UTC 2006
      i686 GNU/Linux

   g++ --version
      g++ (GCC) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)

Without <iostream>, no problem.


-- 
           Summary: purify with iostream reports 128 uninitialized memory
                    reads
           Product: gcc
           Version: 4.0.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mstaley at lanl dot gov


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29529