They're found in the Individual Components tab under Compilers, build tools, and runtimes, and have "Libs for Spectre" in the name. The Spectre-mitigated libraries for Visual Studio can be downloaded in the Visual Studio Installer. Several Microsoft C++ libraries are also available in versions with Spectre mitigation. Starting in Visual Studio 2017 version 15.7, the /Qspectre option is supported at all optimization levels. In its initial release, the /Qspectre option only worked on optimized code. It's available in Visual Studio 2015 Update 3 through KB 4338871. The /Qspectre option is available starting in Visual Studio 2017 version 15.5.5 and all later versions. They affect many operating systems and modern processors, including processors from Intel, AMD, and ARM. These vulnerabilities are called speculative execution side-channel attacks. The /Qspectre option causes the compiler to insert instructions to mitigate certain Spectre security vulnerabilities. Specifies compiler generation of instructions to mitigate certain Spectre variant 1 security vulnerabilities.
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