未定义的引用_unwind_resume和__gxx_personality_v0 [英] Undefined reference to _unwind_resume and __gxx_personality_v0

问题描述

我正在尝试使用JsonCpp库。我在Windows上使用MinGW和CodeBlocks。

当我从json头文件中添加任何内容时，我的链接器会打开并发出这两个错误。我已经开始环顾四周了，我发现了这两个基本上描述我的问题的其他问题：

g ++的问题和__gxx_personality_v0的未定义引用

什么是__gxx_personality_v0 for？

如果我将两个缺失的变量声明为void指针，如下所示，问题消失了：

  void * __gxx_personality_v0 = 0; 
 void * _Unwind_Resume = 0; 
  

但是，我不明白为什么会出现此错误。 CodeBlocks设置为使用migw32-g ++的cpp文件，并且还添加-lstdc ++选项不能解决问题。也不是选项-fno-exception（我想要异常，记住你，我只是试图）。

我还在同一个文件中包含一个boost库，这不会造成任何问题。

编辑：

错误输出正是我在标题中所说的：在链接期间，我总共获得了22个未定义的引用_Unwind_Resume和__gxx_personality_v0。我的代码是：

  #include< boost / algorithm / string.hpp> 
 #include< include / json / value.h> 
 // void * __gxx_personality_v0 = 0; 
 // void * _Unwind_Resume = 0; 
 int main（）{
 std :: string str1（Hello world！）; 
 boost :: to_upper（str1）; 
 Json :: Value k; 
 return 0; 
} 
  

只有当我包含/使用JsonCPP库时，才出现错误。取消注释的注释行修复了问题。

命令行输出是这样的：

  mingw32-g ++。exe -Wall -fexceptions -g -DSFML_DYNAMIC -IC：\Users\Svalorzen\Documents\Projects\boost_1_49 -IC：\Users\Svalorzen\Documents\Projects \jsoncpp-src-0.5.0 -IC：\Users\Svalorzen\Documents\Projects\SFML-1.6\include -IC：\Users\Svalorzen\Documents\Projects\hge181 \include -c C：\Users\Svalorzen\Documents\Projects\test\main.cpp -o obj\Debug\main.o 
 mingw32-g ++。exe -LC： \Users\Svalorzen\Documents\Projects\jsoncpp-src-0.5.0 -LC：\Users\Svalorzen\Documents\Projects\SFML-1.6\lib -LC：\Users \Svalorzen\Documents\Projects\hge181\lib -o bin\Debug\test.exe obj\Debug\main.o -fno-exceptions -lsfml-graphics -lsf ml-window -lsfml-system C：\Users\Svalorzen\Documents\Projects\jsoncpp-src-0.5.0\libs\mingw\libjson_mingw_libmt.a C：\Users\Svalorzen\\ \\ Documents and Share b输出大小为1.22 MB 
处理以状态0（0分钟，3秒）结束
 0错误，0警告
  

SECOND EDIT：
我正在添加我用来编译库的命令行：

 code> g ++ -o buildscons\mingw\src\lib_json\json_reader.o -c -DWIN32 -DNDEBUG -D_MT -Iinclude src\lib_json\json_reader.cpp 
 g ++ -o buildscons \mingw\src\lib_json\json_value.o -c -DWIN32 -DNDEBUG -D_MT -Iinclude src\lib_json\json_value.cpp 
 g ++ -o buildscons\mingw\src\lib_json \json_writer.o -c -DWIN32 -DN DEBUG -D_MT -I include includec ++ buildscons\mingw\src\lib_json\json_value.o buildscons\mingw\src\lib_json\json_writer.o 
 ranlib buildscons\mingw\src\lib_json\libjson_mingw_libmt.a 
  

解决方案

我最终通过导入Code :: Blocks JsonCpp的源代码和自己创建的库。尽管关于为什么使用Scons创建的库为什么使用与Code :: Blocks使用的相同的编译器，但是与此同时不是（或者错误不会在那里），我仍然感到困惑）。

I'm trying to use the JsonCpp library. I'm on Windows, using MinGW and CodeBlocks.

When I include anything from the json headers, my linker implodes and gives out this two errors. I've started to look around and I found these two other questions which basically describe my problem:

problem with g++ and "undefined reference to `__gxx_personality_v0'"

What is __gxx_personality_v0 for?

And if I declare the two missing variables as void pointers, like below, the problem goes away:

void * __gxx_personality_v0=0;
void * _Unwind_Resume =0;

However, I don't understand why this error happens. CodeBlocks is set up so that it uses migw32-g++ for cpp files, and also adding the -lstdc++ option does not fix the problem. Neither does the option -fno-exception ( I want exceptions, mind you, I was just trying ).

I'm also including a boost library in the same file and that does not cause any problems.

EDIT:

The error output is exactly what I said in my title: I get a total of 22 undefined references to _Unwind_Resume and __gxx_personality_v0 during the linking. My code is:

#include <boost/algorithm/string.hpp>
#include <include/json/value.h>
//void * __gxx_personality_v0=0;
//void * _Unwind_Resume =0;
int main () {
    std::string str1("Hello world!");
    boost::to_upper(str1);
    Json::Value k;
    return 0;
}

The error is there only when I include/use the JsonCPP library. Uncommenting the commented lines fixes the problem.

The command line output is this:

mingw32-g++.exe -Wall -fexceptions  -g  -DSFML_DYNAMIC   -IC:\Users\Svalorzen\Documents\Projects\boost_1_49 -IC:\Users\Svalorzen\Documents\Projects\jsoncpp-src-0.5.0 -IC:\Users\Svalorzen\Documents\Projects\SFML-1.6\include -IC:\Users\Svalorzen\Documents\Projects\hge181\include  -c C:\Users\Svalorzen\Documents\Projects\test\main.cpp -o obj\Debug\main.o
mingw32-g++.exe -LC:\Users\Svalorzen\Documents\Projects\jsoncpp-src-0.5.0 -LC:\Users\Svalorzen\Documents\Projects\SFML-1.6\lib -LC:\Users\Svalorzen\Documents\Projects\hge181\lib  -o bin\Debug\test.exe obj\Debug\main.o   -fno-exceptions -lsfml-graphics -lsfml-window -lsfml-system  C:\Users\Svalorzen\Documents\Projects\jsoncpp-src-0.5.0\libs\mingw\libjson_mingw_libmt.a C:\Users\Svalorzen\Documents\Projects\hge181\lib\gcc\libhge.a C:\Users\Svalorzen\Documents\Projects\hge181\lib\gcc\libhelp.a 
Output size is 1.22 MB
Process terminated with status 0 (0 minutes, 3 seconds)
0 errors, 0 warnings

SECOND EDIT: I'm adding the command lines I use to compile the library:

g++ -o buildscons\mingw\src\lib_json\json_reader.o -c -DWIN32 -DNDEBUG -D_MT -Iinclude src\lib_json\json_reader.cpp
g++ -o buildscons\mingw\src\lib_json\json_value.o -c -DWIN32 -DNDEBUG -D_MT -Iinclude src\lib_json\json_value.cpp
g++ -o buildscons\mingw\src\lib_json\json_writer.o -c -DWIN32 -DNDEBUG -D_MT -Iinclude src\lib_json\json_writer.cpp
ar rc buildscons\mingw\src\lib_json\libjson_mingw_libmt.a buildscons\mingw\src\lib_json\json_reader.o buildscons\mingw\src\lib_json\json_value.o buildscons\mingw\src\lib_json\json_writer.o
ranlib buildscons\mingw\src\lib_json\libjson_mingw_libmt.a

解决方案

I finally fixed this by importing into Code::Blocks the source code of JsonCpp and creating the library myself. I am still baffled though as to why the library created with Scons didn't work, since it was using the same compiler that Code::Blocks uses, but at the same time it was not ( or the error wouldn't have been there ).

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