The MSVC Build Tools Preview is updated regularly with the latest features and fixes from the MSVC (Microsoft C++) development team. The MSVC team’s updates for August 2026, targeting the Visual Studio v14.52 release, bring numerous improvements to the C++ front end, modules, code generation, debugging, static analysis, the linker and assembler, and more.

The updates were announced in an August 13 blog post. Developers can get the MSVC Build Tools Preview through the Visual Studio 2026 Stable Channel or (more quickly) through the Insiders Channel.

C++ compiler front end improvements include added support for default-initialized new[] expressions in constant evaluation when used with modules and improved diagnostics for calling-convention mismatches, incompatible compiler options, and unusable compiled-library files. C++ module improvements include improved type merging when header units are shared across multiple modules, and improved module serialization of data members and template information. Optimizer updates include improved optimization of equality-test loops with loop-carried dependencies, improved jump-to-jump optimizations, and improved optimization around restricted pointers and function calls.