MSVC71

From Get docs
Cmake/docs/3.21/variable/msvc71


MSVC71

Discouraged. Use the MSVC_VERSION variable instead.

True when using Microsoft Visual C++ 7.1.

Set to true when the compiler is version 7.1 of Microsoft Visual C++.

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https://cmake.org/cmake/help/v3.21/variable/MSVC71.html