[Build] abseil demands C++14 or better

[waarmond]

Describe the bug
I'm trying to build Paddle2ONNX master with python setup.py build. It seems to demand C++ 11, therefore Abseil fails:

/usr/include/absl/base/policy_checks.h:79:2: error: #error "C++ versions less than C++14 are not supported."
   79 | #error "C++ versions less than C++14 are not supported."
      |  ^~~~~
In file included from /usr/include/absl/base/config.h:92,
                 from /usr/include/absl/base/attributes.h:37,
                 from /usr/include/google/protobuf/port_def.inc:33,
                 from ./Paddle2ONNX/.setuptools-cmake-build/third_party/onnx/onnx/onnx-data_paddle2onnx.pb.h:13,
                 from ./Paddle2ONNX/.setuptools-cmake-build/third_party/onnx/onnx/onnx-data_paddle2onnx.pb.cc:4:
/usr/include/absl/base/policy_checks.h:79:2: error: #error "C++ versions less than C++14 are not supported."
   79 | #error "C++ versions less than C++14 are not supported."
      |  ^~~~~
In file included from /usr/include/absl/base/config.h:92,
                 from /usr/include/absl/base/attributes.h:37,
                 from /usr/include/google/protobuf/port_def.inc:33,
                 from ./Paddle2ONNX/.setuptools-cmake-build/third_party/onnx/onnx/onnx-operators_paddle2onnx-ml.pb.h:13,
                 from ./Paddle2ONNX/.setuptools-cmake-build/third_party/onnx/onnx/onnx-operators_paddle2onnx-ml.pb.cc:4:
/usr/include/absl/base/policy_checks.h:79:2: error: #error "C++ versions less than C++14 are not supported."
   79 | #error "C++ versions less than C++14 are not supported."
      |  ^~~~~
In file included from /usr/include/absl/base/config.h:92,
                 from /usr/include/absl/base/attributes.h:37,
                 from /usr/include/google/protobuf/port_def.inc:33,
                 from ./Paddle2ONNX/.setuptools-cmake-build/third_party/onnx/onnx/onnx_paddle2onnx-ml.pb.h:13,
                 from ./Paddle2ONNX/.setuptools-cmake-build/third_party/onnx/onnx/onnx_paddle2onnx-ml.pb.cc:4:
/usr/include/absl/base/policy_checks.h:79:2: error: #error "C++ versions less than C++14 are not supported."
   79 | #error "C++ versions less than C++14 are not supported."
      |  ^~~~~
/usr/include/google/protobuf/port_def.inc:159:15: error: static assertion failed: Protobuf only supports C++14 and newer.
  159 | static_assert(PROTOBUF_CPLUSPLUS_MIN(201402L), "Protobuf only supports C++14 and newer.");
      |               ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/google/protobuf/port_def.inc:159:15: note: the comparison reduces to '(201103 >= 201402)'
/usr/include/google/protobuf/port_def.inc:159:15: error: static assertion failed: Protobuf only supports C++14 and newer.
  159 | static_assert(PROTOBUF_CPLUSPLUS_MIN(201402L), "Protobuf only supports C++14 and newer.");
      |               ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/google/protobuf/port_def.inc:159:15: note: the comparison reduces to '(201103 >= 201402)'
/usr/include/google/protobuf/port_def.inc:159:15: error: static assertion failed: Protobuf only supports C++14 and newer.
  159 | static_assert(PROTOBUF_CPLUSPLUS_MIN(201402L), "Protobuf only supports C++14 and newer.");
      |               ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/google/protobuf/port_def.inc:159:15: note: the comparison reduces to '(201103 >= 201402)'
/usr/include/google/protobuf/port_def.inc:159:15: error: static assertion failed: Protobuf only supports C++14 and newer.
  159 | static_assert(PROTOBUF_CPLUSPLUS_MIN(201402L), "Protobuf only supports C++14 and newer.");
      |               ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/google/protobuf/port_def.inc:159:15: note: the comparison reduces to '(201103 >= 201402)'

Informations (please complete the following information):

• Python 3.10
• pybind11 2.12.0
• python-absl 2.1.0
• protobuf 25.3

Additional context

[bruvduroiu]

The project uses C++11 as a standard, and this document directs you to build an older version of protobuf (3.16.0) to fix this.

However, I wasn't able to build it successfully, even after following this instruction

[Zheng-Bicheng]

Hey @bruvduroiu @waarmond. The project construction method for Paddle2ONNX has been changed. I apologize for not updating the English documentation in a timely manner, and I will immediately update the English compiled documentation to the latest version.

[Zheng-Bicheng]

• [Doc][Build] Update en docs #1249

[Zheng-Bicheng]

@bruvduroiu I have updated the English version of the compilation document. Please refer to the latest document for compilation. If you encounter any issues, I will assist you in resolving them.