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PODoes the latest Visual Studio 2005 Security Update cause C runtime library issues when hot fixing customer sites
 

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  1. PODoes the latest Visual Studio 2005 Security Update cause C runtime library issues when hot fixing customer sites
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    <p>As you might be aware an update to visual studio 2005 was auto updated on most machines last week. This update included a new version of the visual c runtime library. As a result any binaries built after the update also require a new redistributable installed on client systems.</p> <p>See <a href="http://support.microsoft.com/kb/971090/" rel="nofollow noreferrer">http://support.microsoft.com/kb/971090/</a></p> <p>And here is the installer for the new redistributable:</p> <p><a href="http://www.microsoft.com/downloads/details.aspx?displaylang=en&amp;FamilyID=766a6af7-ec73-40ff-b072-9112bab119c2" rel="nofollow noreferrer">http://www.microsoft.com/downloads/details.aspx?displaylang=en&amp;FamilyID=766a6af7-ec73-40ff-b072-9112bab119c2</a></p> <p>This is fine for distributing new binaries to customers, I will ship the new redistributable with the installer and it will all work.</p> <p>However I am really worried about my ability to hotfix existing customer sites if they discover a bug. In this case normally I would just send the dll or exe that was fixed.</p> <p>However if I do this now, I will have to send these customers the new redistributable and now I will be using two different versions of the c runtime library in the same executable.</p> <ul> <li>Is this a problem? </li> <li>Can this cause my application to crash? </li> <li>What happens if I allocate memory in one dll then deallocate it in another? Normally this works if the same release runtime library is used. I went through the our code about 3 years ago cleaning this up, but I cannot be sure that I have found and fixed all occurrences.</li> <li>Is the allocate/deallocate in different dlls still a problem? Now that in the era of smart pointers etc it is very had to enforce this.</li> <li>Can I control what runtime library version I depend on by changing manifests?</li> </ul> <p>Any pointers or advice would be grateful.</p> <p><strong>Updated:</strong> I have just noticed this question <a href="https://stackoverflow.com/questions/1238376/vc-kb971090-and-selecting-visual-c-runtime-dll-dependencies">VC++: KB971090 and selecting Visual C Runtime DLL dependencies</a> This is very similar, but my question is more concerned with using two different version of the runtime in one executable.</p>
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