fix implicit fallthrough in gcc 7

fixes #3700

fix implicit fallthrough in gcc 7
fixes #3700
37e112f4 · Tobias Jungel · f850188e · 37e112f4
Commit 37e112f4 authored Oct 14, 2017 by Tobias Jungel
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port.h src/google/protobuf/stubs/port.h +2 -0

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--- a/src/google/protobuf/stubs/port.h
+++ b/src/google/protobuf/stubs/port.h
@@ -243,6 +243,8 @@ static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);
     __has_cpp_attribute(clang::fallthrough)
 #  define GOOGLE_FALLTHROUGH_INTENDED [[clang::fallthrough]]
 # endif
+#elif defined(__GNUC__) && __GNUC__ > 6
+# define GOOGLE_FALLTHROUGH_INTENDED [[gnu::fallthrough]]
 #endif

 #ifndef GOOGLE_FALLTHROUGH_INTENDED