The result is that we usually fix only serious security vulnerabilities in old versions of the libraries. It makes it very expensive for us to fix bugs in already-released versions of the libraries because we are no longer actively working in the codebases for those versions, so fixes must be individually backported and tested. Second, it has become very important to support devices smaller than desktops or laptops, like phones, and accumulating multiple copies of very similar libraries on such devices is less than ideal.Įven for us, this model of introducing new versions of the libraries can be painful at times. First, we have accelerated the release schedule of Visual Studio in order to make new features available more frequently. This problem has grown especially acute in recent years for two reasons. However, we have frequently heard from you, our customers, that this model is burdensome and in some cases makes it difficult to adopt new versions of Visual C++ due to dependencies on modules built with an older version of Visual C++ or the need to support plugins built with a particular version of Visual C++. to fix nonconforming or buggy behavior, at any time without worrying about breaking existing software components that depend on already-released versions of these libraries. On the one hand, this model of introducing differently named and completely independent sets of libraries each release makes it a bit easier for us to add new features and fix bugs. For example, a C++ program built with Visual C++ 2010 using the DLL runtime libraries will depend on msvcr100.dll and msvcp100.dll, while a C++ program built with Visual C++ 2013 will depend on msvcr120.dll and msvcp120.dll. This article discusses the major architectural changes to the libraries the second article will enumerate the new features, bug fixes, and breaking changes.)įor the past seven releases of Visual Studio (2002, 2003, 2005, 2008, 2010, 2012, and 2013), the Visual C++ libraries have been versioned and each versioned set of libraries is independent of other versioned sets of libraries. (This is the first of two articles on changes to the C Runtime (CRT) in the Visual Studio “14” CTP.
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