C++ 对 _Unwind_Resume 和 __gxx_personality_v0 的未定义引用
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Undefined reference to _Unwind_Resume and __gxx_personality_v0
提问by Svalorzen
I'm trying to use the JsonCpp library. I'm on Windows, using MinGW and CodeBlocks.
我正在尝试使用 JsonCpp 库。我在 Windows 上，使用 MinGW 和 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:
当我从 json 头文件中包含任何内容时，我的链接器会内爆并给出这两个错误。我开始环顾四周，发现另外两个问题基本上描述了我的问题：
problem with g++ and "undefined reference to `__gxx_personality_v0'"
g++ 的问题和“对‘__gxx_personality_v0’的未定义引用”
What is __gxx_personality_v0 for?
And if I declare the two missing variables as void pointers, like below, the problem goes away:
如果我将两个缺失的变量声明为空指针，如下所示，问题就会消失：
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 ).
但是，我不明白为什么会发生此错误。CodeBlocks 设置为对 cpp 文件使用 migw32-g++，并且添加 -lstdc++ 选项也不能解决问题。选项 -fno-exception 也没有（我想要例外，请注意，我只是在尝试）。
I'm also including a boost library in the same file and that does not cause any problems.
我还在同一个文件中包含了一个 boost 库，这不会导致任何问题。
EDIT:
编辑：
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:
错误输出正是我在标题中所说的：在链接期间，我总共得到了 22 个对 _Unwind_Resume 和 __gxx_personality_v0 的未定义引用。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;
}
The error is there only when I include/use the JsonCPP library. Uncommenting the commented lines fixes the problem.
只有当我包含/使用 JsonCPP 库时才会出现错误。取消注释注释行可以解决问题。
The command line output is this:
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 -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:
第二次编辑：我正在添加用于编译库的命令行：
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
采纳答案by Svalorzen
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 ).
我最终通过将 JsonCpp 的源代码导入 Code::Blocks 并自己创建库来解决此问题。我仍然很困惑，为什么用 Scons 创建的库不起作用，因为它使用的是 Code::Blocks 使用的相同编译器，但同时它不是（或者错误不会出现在那里）。
回答by Riot
For those coming to this from google (like i did), the real cause of the undefined references to _Unwind_Resumeand __gxx_personality_v0is "using a gcc that uses a different stack unwinding method than dwarf2" [1]
对于那些来这从谷歌（如我一样），对未定义的引用的真正原因_Unwind_Resume和__gxx_personality_v0被“利用使用不同的堆栈展开方法比DWARF2一个gcc” [ 1]
In my case it was attempting to link code compiled with GCC 4.9 upwards with a library compiled with GCC 4.8 or below. The solution is to recompile the library with the same compiler you're building with.
就我而言，它试图将使用 GCC 4.9 编译的代码与使用 GCC 4.8 或更低版本编译的库向上链接。解决方案是使用您正在构建的相同编译器重新编译库。
