获取对std :: thread :: _ M_start_thread的未定义引用 [英] Getting undefined reference to std::thread::_M_start_thread

问题描述

我正在构建一个使用第三方lib（Box2D-MT）的应用程序，该应用程序是从源代码构建的。链接时，我得到这个未定义的引用错误：

$ b $ p $ b2Threading.cpp :(。text._ZNSt6threadC2IM12b2ThreadPoolFviEJPS1_iEEEOT_DpOT0 _ [_ ZNSt6threadC5IM12b2ThreadPoolFviEJPS1_iEEEOT_DpOT0 _] + 0xa4）：
未定义引用'std :: thread :: _ M_start_thread（std :: shared_ptr

我用g ++编译并链接到

   - lBox2D -lpthread -lrt -ldl -lstdc ++ 
  

另外，我正在编译

  -std = c ++ 11 
  

查看libstdc ++。a我可以看到类似的符号存在（它是T）：

  nm  - C /usr/lib/gcc/x86_64-linux-gnu/4.9.2/libstdc++.a | grep _M_start_thread 
 0000000000000000 T std :: thread :: _ M_start_thread（std :: shared_ptr< std :: thread :: _ Impl_base>）
  

但是这个重载不需要第二个参数。

我搜索了所有类似的互联网，但似乎没有人（在任何情况下）都有这个问题。

任何暗示为什么我得到这个错误以及我如何解决它？

解决方案

看起来像是头文件/库版本不匹配。这是我得到的：

  $ nm -C /pkgs/gcc/4.9.2/lib/libstdc++.a | grep std :: thread :: _ M_start_thread 
 00000000 T std :: thread :: _ M_start_thread（std :: shared_ptr< std :: thread :: _ Impl_base>）
 
 $ nm -C / pkgs /gcc/5.2.0/lib/libstdc++.a | grep std :: thread :: _ M_start_thread 
 00000000 T std :: thread :: _ M_start_thread（std :: shared_ptr< std :: thread :: _ Impl_base>）
 00000000 T std :: thread :: _ M_start_thread（ std :: shared_ptr< std :: thread :: _ Impl_base> ;, void（*）（））
 
 $ fgrep -r M_start_thread /usr/intel/pkgs/gcc/4.9.2/include/ 
 /pkgs/gcc/4.9.2/include/c++/4.9.2/thread：_M_start_thread（_M_make_routine（std :: __ bind_simple（
 /pkgs/gcc/4.9.2/include/c++/4.9）。 2 / thread：_M_start_thread（__ shared_base_type）; 
 
 $ fgrep -r M_start_thread /usr/intel/pkgs/gcc/5.2.0/include/ 
 /pkgs/gcc/5.2.0/ include / c ++ / 5.2.0 / thread：_M_start_thread（_M_make_routine（std :: __ bind_simple（
 /pkgs/gcc/5.2.0/include/c++/5.2.0/thread：_M_start_thread（_M_make_routine（std :: __ bind_simple （
 /pkgs/gcc/5.2.0/include/c++/5.2.0/thread：_M_start_thread（__ shared_base_type，void（*）（））; 
 /pkgs/gcc/5.2.0/include /c++/5.2.0/thread：_M_start_thread（__ shared_base_type）; 
  

I'm building an app that uses a 3rd party lib (Box2D-MT) which I build from sources. When linking, I get this undefined reference error:

b2Threading.cpp:(.text._ZNSt6threadC2IM12b2ThreadPoolFviEJPS1_iEEEOT_DpOT0_[_ZNSt6threadC5IM12b2ThreadPoolFviEJPS1_iEEEOT_DpOT0_]+0xa4): 
undefined reference to 'std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>, void (*)())'

I am building with g++ and link with

-lBox2D -lpthread -lrt -ldl -lstdc++

also, I am compiling with

-std=c++11

looking into libstdc++.a I can see a similar this symbol exists (it's "T"):

nm -C /usr/lib/gcc/x86_64-linux-gnu/4.9.2/libstdc++.a | grep _M_start_thread
0000000000000000 T std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>)

but this overload doesn't take a second parameter.

I've searched all the internet for something similar, but no one seems to have had this issue before (in any context).

Any hint on why I get this error and how I could solve it?

解决方案

Looks like a headers/libraries version mismatch. This is what I've got:

$ nm -C /pkgs/gcc/4.9.2/lib/libstdc++.a | grep std::thread::_M_start_thread
00000000 T std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>)

$ nm -C /pkgs/gcc/5.2.0/lib/libstdc++.a | grep std::thread::_M_start_thread
00000000 T std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>)
00000000 T std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>, void (*)())

$ fgrep -r M_start_thread /usr/intel/pkgs/gcc/4.9.2/include/
/pkgs/gcc/4.9.2/include/c++/4.9.2/thread:        _M_start_thread(_M_make_routine(std::__bind_simple(
/pkgs/gcc/4.9.2/include/c++/4.9.2/thread:    _M_start_thread(__shared_base_type);

$ fgrep -r M_start_thread /usr/intel/pkgs/gcc/5.2.0/include/
/pkgs/gcc/5.2.0/include/c++/5.2.0/thread:        _M_start_thread(_M_make_routine(std::__bind_simple(
/pkgs/gcc/5.2.0/include/c++/5.2.0/thread:        _M_start_thread(_M_make_routine(std::__bind_simple(
/pkgs/gcc/5.2.0/include/c++/5.2.0/thread:    _M_start_thread(__shared_base_type, void (*)());
/pkgs/gcc/5.2.0/include/c++/5.2.0/thread:    _M_start_thread(__shared_base_type);

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