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iEnsures DLIB_FALLTHROUGH macro is only set for GCC>=7 (#1770)
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@ -24,7 +24,7 @@ namespace dlib
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// Microsoft Visual Studio
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#if (defined(__GNUC__) || defined(__clang__))
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#if ((defined(__GNUC__) && __GNUC__ >= 7) || defined(__clang__))
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#define DLIB_FALLTHROUGH [[fallthrough]]
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#else
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#define DLIB_FALLTHROUGH
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