The MSVC Build Tools Preview is updated regularly with the latest features and fixes from the MSVC development team. This post covers the past month worth of updates, currently targeting the v14.52 release. This encompasses changes across the compiler frontend, backend, linker, standard library, and related tools.<\/p>\n
Although you can acquire the MSVC Build Tools Preview through either the Visual Studio 2026 Stable Channel<\/a>, or Visual Studio 2026 Insiders Channel<\/a>, Insiders gets MSVC Preview updates roughly weekly.<\/p>\n To check if it’s installed simply make sure one or both of these components are checked in the installer:<\/p>\n The version number printed by cl.exe and link.exe will be at least 19.52.36328 \/ 14.52.36328.<\/p>\n We appreciate any feedback that you may have. Please report any issues on Visual Studio Developer Community<\/a> so we can address them by the time we move out of preview.<\/p>\n We’ve completed implementation of P2564R3<\/a> consteval needs to propagate up. In some cases, this feature allows constexpr functions or lambdas to become implicitly immediate if they call immediate (consteval) functions within their body.<\/p>\n Several fixes improve the reliability of C++ modules:<\/p>\n ARM64 improvements:<\/strong><\/p>\n x64 improvements:<\/strong><\/p>\n Vectorization:<\/strong><\/p>\n The following tickets reported through Developer Community have been fixed in this update:<\/p>\n Please try out the MSVC Build Tools Preview and let us know what you think! Installation instructions:<\/p>\n Try the latest updates to MSVC Build Tools Preview<\/p>\n","protected":false},"author":1711,"featured_media":36502,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-36501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cplusplus"],"acf":[],"blog_post_summary":" Try the latest updates to MSVC Build Tools Preview<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts\/36501","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/users\/1711"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/comments?post=36501"}],"version-history":[{"count":1,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts\/36501\/revisions"}],"predecessor-version":[{"id":36505,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts\/36501\/revisions\/36505"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/media\/36502"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/media?parent=36501"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/categories?post=36501"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/tags?post=36501"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
C++23: Immediate Escalation (P2564R3)<\/h3>\n
C++ Modules Improvements<\/h3>\n
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std::format<\/code> inside a lambda produced unexpected compilation errors in C++20 mode.<\/li>\n<\/ul>\nCode Generation and Optimization<\/h3>\n
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if<\/code> condition following a loop duplicates the loop’s control expression.<\/li>\n<\/ul>\n\n
A[i] += B[j]<\/code> patterns.<\/li>\nLinker Improvements<\/h3>\n
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Frontend and Conformance Fixes<\/h3>\n
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reinterpret_cast<\/code> of function pointers in constexpr<\/code> contexts. Code that relied on this non-standard behavior will now correctly produce an error.<\/li>\n[[nodiscard]]<\/code> is no longer silently ignored in certain syntactic positions. A new warning (C5240) is emitted when the attribute cannot be applied.<\/li>\nstd::bit_cast<\/code> for empty classes.<\/li>\nauto<\/code> return types, and SYCL kernel compilation.<\/li>\nauto<\/code> return types for class members so that the return type is no longer prematurely deduced before the function body is defined.<\/li>\nstatic constexpr<\/code> member initialization to properly diagnose invalid initializers when defined out-of-line, instead of silently zero-initializing.<\/li>\nstatic_assert<\/code> diagnostics in dependent class templates to include the “see reference to” message identifying the function causing the instantiation.<\/li>\n__no_init_all_default_constructor<\/code> errors when using \/d1initall<\/code>.<\/li>\n<\/ul>\nAddressSanitizer<\/h3>\n
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STL<\/h3>\n
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Other Fixes<\/h3>\n
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#pragma warning(disable: 4668)<\/code> not taking effect when generating preprocessor output with \/E<\/code>.<\/li>\n\/EHa<\/code> and nested try\/catch blocks.<\/li>\nstd::vector::emplace_back<\/code> for classes with default member initializers.<\/li>\n<\/ul>\nTickets Fixed<\/h2>\n
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Try Out the MSVC Build Tools Preview!<\/h2>\n
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