Converting std cxx11 string to std string

Question

I use c  11  but also some libraries that are not configured for it  and need some type conversion  In particular I need a way to convert std    cxx11  string to regular std  string  but googling I can t find a way to do this and putting  string  in front does not work   If I do not convert I get linker errors like this   undefined reference to  H5  CompType  insertMember std    cxx11  basic string lt char  std  char traits lt char gt   std  allocator lt char gt   gt  const amp   unsigned long  H5  DataType const amp   const

User · Answer

Answers here mostly focus on short way to fix it, but if that does not help, I'll give some steps to check, that helped me (Linux only):

If the linker errors happen when linking other libraries, build those libs with debug symbols ("-g" GCC flag)
List the symbols in the library and grep the symbols that linker complains about (enter the commands in command line):

nm lib_your_problem_library.a | grep functionNameLinkerComplainsAbout
If you got the method signature, proceed to the next step, if you got no symbols instead, mostlikely you stripped off all the symbols from the library and that is why linker can't find them when linking the library. Rebuild the library without stripping ALL the symbols, you can strip debug (strip -S option) symbols if you need.
Use a c++ demangler to understand the method signature, for example, this one
Compare the method signature in the library that you just got with the one you are using in code (check header file as well), if they are different, use the proper header or the proper library or whatever other way you now know to fix it

User · Answer

If you can recompile all incompatible libs you use  do it with compiler option      -D GLIBCXX USE CXX11 ABI 1   and then rebuild your project  If you can t do so  add to your project s makefile compiler option     -D GLIBCXX USE CXX11 ABI 0   The define      define  GLIBCXX USE CXX11 ABI 0 1   is also good but you probably need to add it to all your files while compiler option do it for all files at once

User · Answer

Is it possible that you are using GCC 5      If you get linker errors about undefined references to symbols that involve types in the std    cxx11 namespace or the tag  abi cxx11  then it probably indicates that you are trying to link together object files that were compiled with different values for the  GLIBCXX USE CXX11 ABI macro  This commonly happens when linking to a third-party library that was compiled with an older version of GCC  If the third-party library cannot be rebuilt with the new ABI then you will need to recompile your code with the old ABI    Source  GCC 5 Release Notes Dual ABI  Defining the following macro before including any standard library headers should fix your problem   define  GLIBCXX USE CXX11 ABI 0

User · Answer

I had a similar issue recently while trying to link with the pre-built binaries of hdf5 version 1 10 5 on Ubuntu 16 04  None of the solutions suggested here worked for me  and I was using g   version 9 1  I found that the best solution is to build the hdf5 library from source  Do not use the pre-built binaries since these were built using gcc 4 9  Instead  download the source code archives from the hdf website for your particular distribution and build the library  It is very easy   You will also need the compression libraries zlib and szip from here and here  respectively  if you do not already have them on your system

User · Answer

I got this  the only way I found to fix this was to update all of mingw-64  I did this using pacman on msys2 for your information

User · Answer

For me -D GLIBCXX USE CXX11 ABI 0 didn t help   It works after I linked to C   libs version instead of gnustl

User · Answer

When I had similar issue it s happened because my lib was build using clang    and it s linked to libstdc   so by default on my system  While app binary was build using clang and linked with -lc   option   Easiest way to check dependencies is to perform ldd libName so  To fix it you should use the same library on in app and library    Easiest way  Build library using clang   and compile app using clang    Without extra linking options on both steps  Default stdlib will be used  Build library with -stdlib c   and compile app with -lc    In this case both library and app will use libc   so   Build library without extra options and link binary to -lstdc    In this case both library and app will use libstdc   so

User · Answer

In my case  I was having a similar problem   usr bin ld  Bank cpp   text 0x19c   undefined reference to  Account  SetBank std    cxx11  basic string lt char  std  char traits lt char gt   std  allocator lt char gt   gt    collect2  error  ld returned 1 exit status  After some researches  I realized that the problem was being generated by the way that Visual Studio Code was compiling the Bank cpp file  So  to solve that  I just prompted the follow command in order to compile the c   file sucessful  g   Bank cpp Account cpp -o Bank  With the command above  It was able to linkage correctly the Header  Implementations and Main c   files  OBS  My g   version  9 3 0 on Ubuntu 20 04

[c++] Converting std::__cxx11::string to std::string

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