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meson/docs/markdown/snippets/msvc_cplusplus_define.md

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MSVC now sets the __cplusplus #define accurately

MSVC will always return 199711L for __cplusplus, even when a newer c++ standard is explicitly requested, unless you pass a specific option to the compiler for MSVC 2017 15.7 and newer. Older versions are unaffected by this.

Microsoft's stated rationale is that "a lot of existing code appears to depend on the value of this macro matching 199711L", therefore for compatibility with such (MSVC-only) code they will require opting in to the standards-conformant value.

Meson now always sets the option if it is available, as it is unlikely that users want the default behavior, and impossible to use the default behavior in cross-platform code (which frequently breaks as soon as the first person tries to compile using MSVC).