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> Most serious projects use these flags anyway.

Most serious projects are opting in to being unable to compile on future compilers whenever new warnings are added?

Obviously, -Werror shouldn't be enabled by default, only for things like CI tests.

On the contrary, it should be on by default for every build configuration! If you move to a newer compiler version and the compilation breaks, then you just saved yourself valuable debugging time. The alternative is that the new compiler has a new optimization that causes your code to break in runtime. You can always disable specific warnings if you think they're not relevant for your code.

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