error C2338: /RTCc rejects conformant code error solution

Using VS2019/VS2022 to build the project reports an error
Severity Code Description Project File Line Suppression State Error C1189 #error: /RTCc rejects conformant code, so it is not supported by the C++ Standard Library. Either remove this compiler option, or define _ALLOW_RTCc_IN_STL to acknowledge that you have received this warning. ArxProject2 C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29333\include\yvals_core.h 1231

Modify Project -> C/C++ -> Smaller Type Check, change to No

![Image Description](https://cdn.bimath.com/blog/pg/Snipaste_2026-01-04_16-11-32.png)
, Clean the project and then build.
![Image Description](https://cdn.bimath.com/blog/pg/Snipaste_2026-01-04_16-11-39.png)