# Copyright 2026 The Google AI Edge Authors. All Rights Reserved.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

diff --git a/src/google/protobuf/port.h b/src/google/protobuf/port.h

--- a/src/google/protobuf/port.h

+++ b/src/google/protobuf/port.h

@@ -544,7 +544,13 @@

alignas(std::string) char buffer_[sizeof(std::string)];

};

-using GlobalEmptyString = std::conditional_t<

- GlobalEmptyStringConstexpr::HasConstexprDefaultConstructor(0),

- const GlobalEmptyStringConstexpr, GlobalEmptyStringDynamicInit>;

+#ifdef _MSC_VER

+// MSVC: force DynamicInit to maintain ABI compatibility when protobuf sources

+// compile with /std:c++17 while the rest of the project uses /std:c++20.

+using GlobalEmptyString = GlobalEmptyStringDynamicInit;

+#else

+using GlobalEmptyString = std::conditional_t<

+ GlobalEmptyStringConstexpr::HasConstexprDefaultConstructor(0),

+ const GlobalEmptyStringConstexpr, GlobalEmptyStringDynamicInit>;

+#endif

PROTOBUF_EXPORT extern GlobalEmptyString fixed_address_empty_string;