[Boost-bugs] [Boost C++ Libraries] #8438: vector & circular_buffer storage misbehave when using compiler optimizations

Subject: [Boost-bugs] [Boost C++ Libraries] #8438: vector & circular_buffer storage misbehave when using compiler optimizations
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-04-15 12:35:39

#8438: vector & circular_buffer storage misbehave when using compiler
optimizations
------------------------------+---------------------------------------------
 Reporter:  ofir              |       Owner:  jano_gaspar    
     Type:  Bugs              |      Status:  new            
Milestone:  To Be Determined  |   Component:  circular_buffer
  Version:  Boost 1.52.0      |    Severity:  Problem        
 Keywords:                    |  
------------------------------+---------------------------------------------
 When compiling the following code without optimizations, it behaves as
 expected: (compiled with g++-4.7.2 with no flags at all)

 #include <boost/numeric/ublas/vector.hpp>
 #include <boost/numeric/ublas/io.hpp>
 #include <boost/circular_buffer.hpp>

 int main () {
     boost::numeric::ublas::vector<double, boost::circular_buffer<double> >
 v (3, 1);
     std::cout << v << std::endl;
     v[1] = 5;
     std::cout << v << std::endl;
     std::cout << v[1] << std::endl;
     return 0;
 }


 Output:
 [3](1,1,1)
 [3](1,5,1)
 5

 When compiling the exact same code with O1, O2, and O3 it produces the
 following output:
 [3](0,0,0)
 [3](0,0,0)
 5

 I noticed that inner_prod() also sees the vector as zeros.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8438>
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