The MSVC Build Tools Preview is updated regularly with the latest features and fixes from the MSVC development team. This post covers updates from the past month, 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 Insiders Channel<\/a>, Insiders gets MSVC Preview updates more quickly (roughly weekly).<\/p>\n To check if it is installed simply make sure one or both of these components are checked in the installer:<\/p>\n Follow the instructions on https:\/\/aka.ms\/msvc\/preview<\/a> to configure your IDE & command prompts to use the MSVC Build Tools Preview.<\/p>\n The version number printed by cl.exe and link.exe will be at least 19.52.36520 \/ 14.52.36520.<\/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 ARM64 improvements:<\/strong><\/p>\n x64 improvements:<\/strong><\/p>\n Optimizer:<\/strong><\/p>\n Other code generation:<\/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":36687,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-36686","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\/36686","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=36686"}],"version-history":[{"count":1,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts\/36686\/revisions"}],"predecessor-version":[{"id":36725,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts\/36686\/revisions\/36725"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/media\/36687"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/media?parent=36686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/categories?post=36686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/tags?post=36686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
C++ Conformance and Frontend<\/h3>\n
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constexpr<\/code> new[]<\/code> (array allocation) inside modules.<\/li>\ndecltype<\/code> of a captured entity inside a non-mutable lambda.<\/li>\n__is_constructible<\/code> type trait.<\/li>\nstd::is_layout_compatible<\/code> on structs containing nested structs.<\/li>\n_Pragma<\/code> handling: better support when mixed with macros, full support under \/E<\/code>, and fixes for preprocessor crashes when a function-like macro expands at a _Pragma<\/code>.<\/li>\n^<\/code>) diagnostics are enabled.<\/li>\nstatic_cast<\/code> when the member has a deduced (auto<\/code>) return type in a class template.<\/li>\nC2641<\/code>.<\/li>\nrequires<\/code> with a default template argument before a parameter pack, coroutines with aggregate initialization, and recursive variadic template default member initializers.<\/li>\nMultiByteToWideChar<\/code> handling on older Windows versions.<\/li>\n<\/ul>\nC++ Modules<\/h3>\n
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fatal error C1001<\/code> and C1116<\/code> regression when importing a partitioned C++23 module (built with import std;<\/code>) after including third-party headers.<\/li>\nLNK4321<\/code> warning that diagnoses duplicate C++ module exports in an import library.<\/li>\n<\/ul>\nCode Generation and Optimization<\/h3>\n
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floor<\/code>, ceil<\/code>, trunc<\/code>, and round<\/code>.<\/li>\n\n
popcount<\/code>) patterns.<\/li>\nfloor<\/code> expansion.<\/li>\n\n
\/fp:strict<\/code>.<\/li>\n<\/ul>\n\n
\/LTCG:incremental<\/code> unnecessarily falling back to a full compilation on alternating links.<\/li>\n\/Od<\/code> + \/O2<\/code> LTCG build.<\/li>\nC4744<\/code> for extern<\/code> type mismatches under LTCG.<\/li>\n<\/ul>\nLinker<\/h3>\n
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\/NOEXP<\/code> option is used.<\/li>\nStatic Analysis<\/h3>\n
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throw<\/code> in a ternary operator.<\/li>\n<\/ul>\nAddressSanitizer<\/h3>\n
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RtlReAllocateHeap<\/code>, preventing crashes when re-allocating ASan-owned memory during process termination.<\/li>\n<\/ul>\nSTL<\/h3>\n
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Tickets Fixed<\/h2>\n
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_Pragma<\/code>.<\/a><\/li>\nimport std;<\/code>) after #include<\/code>ing asio<\/a><\/li>\nTry Out the MSVC Build Tools Preview!<\/h2>\n
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