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  • Brad King's avatar
    MSVC: Do not add /W3 to CMAKE_<LANG>_FLAGS by default · 1baf122c
    Brad King authored
    We do not add default warning flags on other compilers, and having
    a warning flag in the default flags makes it hard for projects to
    customize the warning level.  They need to use string processing
    to remove `/W3` from `CMAKE_{C,CXX}_FLAGS`.  Therefore we should
    drop it.
    
    However, projects may be using string processing to replace `/W3`
    with another flag, so we cannot simply drop it.  Add a policy to
    drop it in a compatible way.
    
    Fixes: #18317
    1baf122c