CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


In file included from /home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/any.cc:36:
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/message.h:234:13: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
  constexpr Message() {}
            ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/message.h:234:13: note: non-literal type 'google::protobuf::MessageLite' cannot be used in a constant expression
1 error generated.
make[2]: *** [source_subfolder/cmake/CMakeFiles/libprotobuf.dir/__/src/google/protobuf/any.cc.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from /home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:4:
In file included from /home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.h:30:
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/message.h:234:13: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
  constexpr Message() {}
            ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/message.h:234:13: note: non-literal type 'google::protobuf::MessageLite' cannot be used in a constant expression
In file included from /home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/any.pb.cc:4:
In file included from /home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/any.pb.h:30:
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/message.h:234:13: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
  constexpr Message() {}
            ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/message.h:234:13: note: non-literal type 'google::protobuf::MessageLite' cannot be used in a constant expression
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/any.pb.cc:20:16: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
constexpr Any::Any(
               ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/any.pb.cc:20:16: note: non-literal type '::google::protobuf::Message' cannot be used in a constant expression
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/any.pb.cc:26:13: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
  constexpr AnyDefaultTypeInternal()
            ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/any.pb.cc:27:7: note: non-literal type 'google::protobuf::Any' cannot be used in a constant expression
    : _instance(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized{}) {}
      ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:20:16: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
constexpr Api::Api(
               ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:20:16: note: non-literal type '::google::protobuf::Message' cannot be used in a constant expression
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:31:13: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
  constexpr ApiDefaultTypeInternal()
            ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:32:7: note: non-literal type 'google::protobuf::Api' cannot be used in a constant expression
    : _instance(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized{}) {}
      ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:39:19: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
constexpr Method::Method(
                  ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:39:19: note: non-literal type '::google::protobuf::Message' cannot be used in a constant expression
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:50:13: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
  constexpr MethodDefaultTypeInternal()
            ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:51:7: note: non-literal type 'google::protobuf::Method' cannot be used in a constant expression
    : _instance(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized{}) {}
      ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:58:18: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
constexpr Mixin::Mixin(
                 ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:58:18: note: non-literal type '::google::protobuf::Message' cannot be used in a constant expression
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:63:13: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
  constexpr MixinDefaultTypeInternal()
            ^
/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/source_subfolder/src/google/protobuf/api.pb.cc:64:7: note: non-literal type 'google::protobuf::Mixin' cannot be used in a constant expression
    : _instance(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized{}) {}
      ^
3 errors generated.
make[2]: *** [source_subfolder/cmake/CMakeFiles/libprotobuf.dir/__/src/google/protobuf/any.pb.cc.o] Error 1
7 errors generated.
make[2]: *** [source_subfolder/cmake/CMakeFiles/libprotobuf.dir/__/src/google/protobuf/api.pb.cc.o] Error 1
make[1]: *** [source_subfolder/cmake/CMakeFiles/libprotobuf.dir/all] Error 2
make: *** [all] Error 2
protobuf/3.15.4: WARN: Build folder is dirty, removing it: /home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89
protobuf/3.15.4: ERROR: Package '80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89' build failed
protobuf/3.15.4: WARN: Build folder /home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89
ERROR: protobuf/3.15.4: Error in build() method, line 157
	cmake.build()
	ConanException: Error 2 while executing cmake --build '/home/conan/w/cci_PR-4776/.conan/data/protobuf/3.15.4/_/_/build/80c2f5e5562853d4b5b1afabcbe7f8c37a7cea89/build_subfolder' '--' '-j3'