[C++] Invalid MSVC flag causes nuisance C++ build warnings
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Component: C++
Type: bug
- Dominant language
- C++
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Description
### Describe the bug, including details regarding any error messages, version, and platform.
A cmake file configuring CXX flags currently sets "/arch:SSE4.2" for MSVC x86 builds. This is invalid syntax, causing hundreds of warnings from the compiler. Tested with cl.exe from Visual Studio 18.
https://learn.microsoft.com/en-us/cpp/build/reference/arch-x86
### Component(s)
C++
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