当我在 macOS 上使用 py++ 生成 boost.Python 包装器时，出现关于 std::string 的错误？

Posted 2023-02-23

【中文标题】当我在 macOS 上使用 py++ 生成 boost.Python 包装器时，出现关于 std::string 的错误？

【英文标题】：When I use py++ to generate then boost.Python wrapper on macOS, I got a error about std::string?

【发布时间】：2018-02-19 06:48:43

【问题描述】：

我要为其生成包装器的代码是

#include <string>
#include <iostream>

class Dog

public:
  Dog(int age, std::string name):age_(age),name_(name)

  void bark()
  
      std::cout<<"Wang! Wang!"<<std::endl;
  
private:
  int age_;
  std::string name_;
;

生成python代码如下：

from pygccxml import parser
from pyplusplus import module_builder

generator_path="/usr/local/bin/castxml"
generator_name="castxml"
compiler="clang++"
compiler_path="/usr/bin/clang++"

xml_generator_config=parser.xml_generator_configuration_t(xml_generator_path=generator_path,
                                                   xml_generator=generator_name,
                                                    compiler=compiler,
                                                   compiler_path=compiler_path)

header_collection=["Bonjour.hpp"]

builder=module_builder.module_builder_t(header_collection,xml_generator_path=generator_path,
                                        xml_generator_config=xml_generator_config)

builder.classes().add_properties(exclude_accessors=True)

builder.build_code_creator(module_name="pylib_auto")

builder.write_module('pylib_auto.cpp')

我使用命令运行：

python3 pylib_generator.py

我收到以下错误：

    INFO Parsing source file "Bonjour.hpp" ...
    In file included from Bonjour.hpp:1:
    In file included from /Library/Developer/CommandLineTools/usr/include/c++/v1/string:469:
    /Library/Developer/CommandLineTools/usr/include/c++/v1/__config:235:11: fatal error: 'endian.h' file not found
    # include <endian.h>
              ^~~~~~~~~~
    1 error generated.
    Traceback (most recent call last):
      File "pylib_generator.py", line 17, in <module>
        xml_generator_config=xml_generator_config)
      File "/usr/local/lib/python3.6/site-packages/pyplusplus/module_builder/boost_python_builder.py", line 106, in __init__
        , indexing_suite_version)
      File "/usr/local/lib/python3.6/site-packages/pyplusplus/module_builder/boost_python_builder.py", line 149, in __parse_declarations
        decls = reader.read_files( files, compilation_mode )
      File "/usr/local/lib/python3.6/site-packages/pygccxml/parser/project_reader.py", line 264, in read_files
        return self.__parse_file_by_file(files)
      File "/usr/local/lib/python3.6/site-packages/pygccxml/parser/project_reader.py", line 292, in __parse_file_by_file
        decls = reader.read_file(header)
      File "/usr/local/lib/python3.6/site-packages/pygccxml/parser/source_reader.py", line 356, in read_file
        return self.read_cpp_source_file(source_file)
      File "/usr/local/lib/python3.6/site-packages/pygccxml/parser/source_reader.py", line 375, in read_cpp_source_file
        xml_file = self.create_xml_file(ffname)
      File "/usr/local/lib/python3.6/site-packages/pygccxml/parser/source_reader.py", line 324, in create_xml_file
        ": %s status:%s" % (gccxml_msg, exit_status))
    RuntimeError: Error occurred while running CASTXML:  status:1

然后我尝试做一个endian.h的软链接

ln -s /usr/include/machine/endian.h /usr/local/include/endian.h

我收到以下错误：

    INFO Parsing source file "Bonjour.hpp" ...
    In file included from Bonjour.hpp:1:
    In file included from /Library/Developer/CommandLineTools/usr/include/c++/v1/string:469:
    In file included from /Library/Developer/CommandLineTools/usr/include/c++/v1/__config:235:
    /usr/local/include/endian.h:37:2: error: architecture not supported
    #error architecture not supported
     ^
    In file included from Bonjour.hpp:1:
    In file included from /Library/Developer/CommandLineTools/usr/include/c++/v1/string:469:
    /Library/Developer/CommandLineTools/usr/include/c++/v1/__config:906:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or
          '-fms-extensions' to enable support for __declspec attributes
    _LIBCPP_FUNC_VIS extern "C" void __sanitizer_annotate_contiguous_container(
    ^
    /Library/Developer/CommandLineTools/usr/include/c++/v1/__config:583:37: note: expanded from macro '_LIBCPP_FUNC_VIS'
    #define _LIBCPP_FUNC_VIS            _LIBCPP_DLL_VIS
                                        ^
    /Library/Developer/CommandLineTools/usr/include/c++/v1/__config:576:26: note: expanded from macro '_LIBCPP_DLL_VIS'
    # define _LIBCPP_DLL_VIS __declspec(dllimport)
                             ^
    /Library/Developer/CommandLineTools/usr/include/c++/v1/__config:940:4: error: "No thread API"

PS：

ProductName:    Mac OS X
ProductVersion: 10.13.3
BuildVersion:   17D47

Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

我想知道为什么会出现这些错误，看来我可以用clang++编译。谢谢任何可以回答这个问题的人！！！

【问题讨论】：

不要用符号链接破解它。你的编译器试图告诉你一些事情。把它涂在上面可能是自找麻烦

【参考方案1】：

我在我的mac上手动编译castxml，没有问题了。在我用 brew 安装 castxml 之前。希望有用！

【参考方案2】：

我不确定是什么让您断定std::string 存在问题。

不过，我可以看到一些有趣的事情：

/Library/Developer/CommandLineTools/usr/include/c++/v1/__config:940:4: 错误：“无线程 API”

这可能表明您需要链接线程支持。编译器通常使用-pthread 标志，但您可能还需要在您的平台上指定链接器输入（而不是？）。在 gcc/clang 上，链接器输入通常是 -pthread 和 -lpthread

/Library/Developer/CommandLineTools/usr/include/c++/v1/__config:906:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or
  '-fms-extensions' to enable support for __declspec attributes

尝试使用-fms-extensions 或-fdeclspec

【讨论】：

我已经尝试删除 Bonjour.hpp 中的 std::string，没关系

我明白了。但是放大消息并不表明该类型存在实际问题。它提出了值得配置标准库的问题，比如我强调的两点

我通过重新编译 castxml 来解决它，在此之前我用 brew 安装 castxml。

@祈祷酷。考虑将其发布为答案，它可能对其他人有所帮助。更正，我看到你已经这样做了：）干杯。