[cfe-dev] Different -Wall semantics in Clang and GCC

[Alexey Izbyshev]

Hello,

I have discovered that -Wall option behaves differently in Clang and 
GCC. In Clang, it reenables warnings that were explicitly disabled in 
earlier options, but in GCC it does not. Is this difference intentional? 
I'm asking since it breaks Clang builds of projects that rely on GCC 
semantics (in particular, those that use patterns like -Werror 
<disable-some-warnings> -Wall <disable-more-warnings>).

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Alexey Izbyshev