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Fix gcc error: comparison of unsigned expression in '>= 0' is always …
…true [-Werror=type-limits] This fixes the following build error: In file included from no_warning_test.cc:7: ../../src/google/protobuf/parse_context.h: In instantiation of 'const char* google::protobuf::internal::EpsCopyInputStream::AppendUntilEnd(const char*, const A&) [with A = google::protobuf::internal::EpsCopyInputStream::AppendString(const char*, std::string*)::<lambda(const char*, ptrdiff_t)>]': ../../src/google/protobuf/parse_context.h:366:70: required from here ../../src/google/protobuf/stubs/logging.h:161:48: error: comparison of unsigned expression in '>= 0' is always true [-Werror=type-limits] 161 | #define GOOGLE_CHECK_GE(A, B) GOOGLE_CHECK((A) >= (B)) | ^ ../../src/google/protobuf/stubs/logging.h:151:5: note: in definition of macro 'GOOGLE_LOG_IF' 151 | !(CONDITION) ? (void)0 : GOOGLE_LOG(LEVEL) | ^~~~~~~~~ ../../src/google/protobuf/stubs/logging.h:161:31: note: in expansion of macro 'GOOGLE_CHECK' 161 | #define GOOGLE_CHECK_GE(A, B) GOOGLE_CHECK((A) >= (B)) | ^~~~~~~~~~~~ ../../src/google/protobuf/stubs/logging.h:201:26: note: in expansion of macro 'GOOGLE_CHECK_GE' 201 | #define GOOGLE_DCHECK_GE GOOGLE_CHECK_GE | ^~~~~~~~~~~~~~~ ../../src/google/protobuf/parse_context.h:351:7: note: in expansion of macro 'GOOGLE_DCHECK_GE' 351 | GOOGLE_DCHECK_GE(chunk_size, static_cast<size_t>(0)); | ^~~~~~~~~~~~~~~~ cc1plus: all warnings being treated as errors
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