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15 lines
846 B
Diff
15 lines
846 B
Diff
diff --git a/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h b/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h
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index 557c57d35cb4..5fa041612a0b 100644
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--- a/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h
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+++ b/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h
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@@ -39,7 +39,8 @@
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// We require C++11 and Clang to use constexpr for variables, as GCC 4.8
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// requires constexpr to be consistent between declarations of variables
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// unnecessarily (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58541).
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-#ifdef __clang__
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+// VS 2017 Update 3 also supports this usage of constexpr.
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+#if defined(__clang__) || (defined(_MSC_VER) && _MSC_VER >= 1911)
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#define PROTOBUF_CONSTEXPR_VAR constexpr
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#else // !__clang__
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#define PROTOBUF_CONSTEXPR_VAR
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