Protobuf build issues on AIX.

<!-- NOTE: this form is for bug reports only. For questions or troubleshooting, please post on the protobuf mailing list: https://groups.google.com/forum/#!forum/protobuf Stack Overflow is also a useful unofficial resource https://stackoverflow.com/questions/tagged/protocol-buffers Vulnerabilities should not be reported using this form, and should be submitted to the Google Vulnerability Reward Program: https://bughunters.google.com/report --> **What version of protobuf and what language are you using?** Version: main/v33.0/ Language: C++/Java/Python/C#/Ruby/PHP/Objective-C/Javascript **What [supported operating system version](https://github.com/google/oss-policies-info/tree/main) are you using (e.g. Linux, Windows) ?** AIX **What [supported runtime / compiler version](https://github.com/google/oss-policies-info/tree/main) are you using (e.g. python version, gcc version)** IBM OpenXl **What did you do?** While building onnx it fetches the protobuf version >= v33, because of it the build is failing. Steps to reproduce the behavior: 1. Go to 'onnx' GitHub repo copy it locally 2. Build it via flags ``` export OBJECT_MODE=64 export CC="/opt/IBM/openxlC/17.1.2/bin/ibm-clang" export CXX="/opt/IBM/openxlC/17.1.2/bin/ibm-clang++_r" export CFLAGS=" -pthread -m64 -mcmodel=large -maltivec -mvsx -D_ALL_SOURCE -Wno-deprecate-lax-vec-conv-all -Wno-unused-but-set-variable -Wno-unused-command-line-argument -Wno-unused-variable -Wno-unused-parameter -Wno-sign-compare -Wno-shorten-64-to-32 -fvisibility=default -fpermissive" export CXXFLAGS="-pthread -m64 -mcmodel=large -maltivec -mvsx -D_ALL_SOURCE -std=c++17 -Wno-deprecate-lax-vec-conv-all -Wno-unused-but-set-variable -Wno-unused-command-line-argument -Wno-unused-variable -Wno-unused-parameter -Wno-sign-compare -Wno-shorten-64-to-32 -fvisibility=default -fpermissive" ``` and then ``` cmake -B build cmake --build build ``` 3. The error ``` In file included from /home/Kushal/CVE/onnx/build/_deps/protobuf-src/src/google/protobuf/any.pb.h:23: /onnx/build/_deps/protobuf-src/src/google/protobuf/generated_message_tctable_decl.h:260:15: error: static assertion failed due to requirement 'sizeof(google::protobuf::internal::MapAuxInfo) <= 8': 260 | static_assert(sizeof(MapAuxInfo) <= 8, ""); | ^~~~~~~~~~~~~~~~~~~~~~~ /onnx/build/_deps/protobuf-src/src/google/protobuf/generated_message_tctable_decl.h:260:34: note: expression evaluates to '12 <= 8' 260 | static_assert(sizeof(MapAuxInfo) <= 8, ""); | ~~~~~~~~~~~~~~~~~~~^~~~ 1 error generated. gmake[2]: *** [_deps/protobuf-build/CMakeFiles/libprotobuf.dir/build.make:79: _deps/protobuf-build/CMakeFiles/libprotobuf.dir/src/google/protobuf/any.pb.cc.o] Error 1 gmake[1]: *** [CMakeFiles/Makefile2:1360: _deps/protobuf-build/CMakeFiles/libprotobuf.dir/all] Error 2 gmake: *** [Makefile:136: all] Error 2 ``` Another error: ``` [ 65%] Linking CXX executable protoc ld: 0711-317 ERROR: Undefined symbol: __stop_pb_defaults ld: 0711-317 ERROR: Undefined symbol: __start_pb_defaults ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information. .ibm-clang: error: linker command failed with exit code 8 (use -v to see invocation) gmake[2]: *** [_deps/protobuf-build/CMakeFiles/protoc.dir/build.make:197: _deps/protobuf-build/protoc-31.1.0] Error 8 gmake[1]: *** [CMakeFiles/Makefile2:1855: _deps/protobuf-build/CMakeFiles/protoc.dir/all] Error 2 gmake: *** [Makefile:136: all] Error 2 ```