The retail and debug UCRT DLLs are found in separate locations. The retail and debug static libraries are libucrt.lib and libucrtd.lib, and the libraries for the UCRT DLLs are ucrt.lib and ucrtd.lib. The UCRT static libraries and dynamic link stub libraries are found in the Program Files or Program Files (x86) directory under Windows Kits\10\Lib\\ucrt\, where architecture is ARM64, x86, or X64. A typical location for the header files is in the Program Files or Program Files (x86) directory under Windows Kits\10\Include\\ucrt, where corresponds to a Windows version or update, for example, 3.0 for the Anniversary Update of Windows 10. The Standard C Library header files are now found in the Windows SDK in an include folder in an SDK version-specific directory. Similarly, if you use a Developer command prompt to do command-line builds, the environment variables that contain paths for headers and libraries are updated and work automatically as well. And, the linker automatically uses the new default UCRT and vcruntime libraries. When you update your Visual Studio C++ projects, if they use the default project settings, the IDE automatically finds the new locations for header files. The Visual Studio installer adds the locations of the UCRT headers, libraries and DLL files to the default paths used by the Visual Studio project build system. When you install Visual Studio, the parts of the Windows SDK required to use the UCRT are also installed. Where to find the Universal CRT filesĪs a Windows component, the UCRT library files and headers are now part of the Windows software development kit (SDK). To take advantage of these changes, you must update your existing code and project build systems. Many functions and macros in the UCRT were also added or changed to improve standards conformance. This refactoring has changed the names or locations of many CRT header files, library files, and Redistributable files, and the deployment methods required for your code. The benefit is that you no longer need to update your builds to target a new version of the CRT with every upgrade of Visual Studio. ![]() You can use the UCRT on any version of Windows supported by Visual Studio 2015 or Visual Studio 2017. It's no longer tied to a specific version of the compiler. The UCRT supports a stable ABI based on C calling conventions, and it conforms closely to the ISO C99 standard, with only a few exceptions. The UCRT is now a Windows component, and ships as part of Windows 10 and later. The compiler-specific components of the CRT were moved into a new vcruntime library. The Standard C Library, POSIX extensions and Microsoft-specific functions, macros, and global variables were moved into a new library, the Universal C Runtime Library (Universal CRT or UCRT). ![]() ![]() The Microsoft C Runtime Library (CRT) was refactored in Visual Studio 2015.
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