title: libstdc++-6 dll errors with opencv
body: <p>Let's start with a bit of history and explanation of my situtation, I'm a french trainee (so sorry for my english, i'll do my best so that you can understand me), I started to write my program with visual studio 2008 and Open CV 2.4.1, after 2 months my C++ program works fine and I now have to do the interface, using Qt.</p>
  
  <p>I first installed an older version of Qt, an SDK that matches with the visual studio 2008 compiler, and I tried to do a very simple first interface with just some pushbutton and information windows to get used to Qt, and I couldn't run this, I had a runtime error form Visual Studio. So, I compiled the same simple program with mingw, and it worked fine. (I did not use opencv at that time).</p>
  
  <p>So then, I started to take some methods from my big program, so I had to add some opencv stuff in the Qt properties, and that is when all crashes. I spent 3 days trying many many "solutions" that I've found on internet, but it doesn't change anything, so now I'm desperate. Here are all the combination I tired :</p>
  
  <p>1) Qt Creator 4 (something) and opencv2.4.1 : my little program compiles fine, but when I ran it, I had the error -1074751515, this is a dll error so I downloaded dependency walkers and it gave me all the dll I had to copy/paste near my .exe, which I did. The error became -1074751511, I couldn't find the exact meaning of that error so I executed manually my .exe and I had an error telling me something about the libstdc++-6.dll (entry point not found or whatever). I uninstalled Qt, and reinstalled it, but nothing changed. So, I downloaded code::blocks, to recompile opencv 2.4.1 with mingw</p>
  
  <p>2) Code::Blocks (the very last version) and opencv2.4.1 : I copied/pasted a very famous and simple program, (the lena.jpg stuff. It compiled, but same error about the libstdc stuff when I ran it so how can I recompile my opencv ?</p>
  
  <p>3) other computer Qt Creator 5.0.2 and opencv 2.4.1 : same error about libstdc</p>
  
  <p>4) on this "other computer" code::blocks and opencv 2.4.5 (5 and not 1) : the lena program still crashes with this libstdc error (entry point could not be found)</p>
  
  <p>And now I'm out of idea.</p>
  
  <p>How can I fix this libstdc++-6 dll issue that crashes everything everywhere ?</p>
  
  <p>If you need to see some code, juste tell me and I'll edit.</p>
  
  <p>Thanks a lot !</p>