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* Add deprecation warnings for policies CMP0094 and belowBrad King2021-10-081-0/+10
| | | | | | | The OLD behaviors of all policies are deprecated, but only by documentation. Add an explicit deprecation diagnostic for policies introduced in CMake 3.15 and below to encourage projects to port away from setting policies to OLD.
* MSVC: Do not add /W3 to CMAKE_<LANG>_FLAGS by defaultBrad King2019-04-196-0/+26
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