报错解决： error: this use of "defined" may not be portable

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本文解决了在编译GRPC时遇到的特定错误，涉及到如何修改makefile中的CXXFLAGS_opt参数来避免编译警告，确保编译过程顺利进行。

在编译grpc的时候报错如下：

[HOSTCXX] Compiling src/compiler/cpp_generator.cc
In file included from third_party/protobuf/src/google/protobuf/stubs/common.h:45:0,
                 from include/grpc++/impl/codegen/config_protobuf.h:23,
                 from ./src/compiler/config.h:22,
                 from ./src/compiler/cpp_generator.h:29,
                 from src/compiler/cpp_generator.cc:21:
third_party/protobuf/src/google/protobuf/stubs/port.h:263:5: error: this use of "defined" may not be portable [-Werror=expansion-to-defined]
 #if GOOGLE_PROTOBUF_USE_UNALIGNED
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
third_party/protobuf/src/google/protobuf/stubs/port.h:263:5: error: this use of "defined" may not be portable [-Werror=expansion-to-defined]
third_party/protobuf/src/google/protobuf/stubs/port.h:263:5: error: this use of "defined" may not be portable [-Werror=expansion-to-defined]
third_party/protobuf/src/google/protobuf/stubs/port.h:263:5: error: this use of "defined" may not be portable [-Werror=expansion-to-defined]