Using Python 3.3 in C++ 'python33_d.lib' not found

18
votes

I am trying to #include <Python.h> in my C++ code and when I go to compile my code I get the error of:

fatal error LNK1104: cannot open file 'python33_d.lib'

Now I have tried to find the python33_d.lib file on my computer to include in my linker dependencies, but I is not found. I have been able to find python33.lib.

Where can I find the python33_d.lib, or how can I resolve this issue?

5
c++pythonvisual-c++

5 Answers

19
votes

*_d.lib is used for debug builds. Switch to a release build instead.

29
votes

Simple solution from the python bug tracker:

#ifdef _DEBUG
  #undef _DEBUG
  #include <python.h>
  #define _DEBUG
#else
  #include <python.h>
#endif
24
votes

In the event that you need a debug version (as I do for work), it is possible to build the library yourself:

  1. Download the source tarball from http://www.python.org/download
  2. Extract the tarball (7zip will do the trick) and go into the resulting directory (should be something like Python-3.3.2).
  3. From the Python directory, go to the PCBuild folder. There are two important files here: readme.txt, which contains the instructions for building Python in Windows (even if it uses the UNIX line feed style...), and pcbuild.sln, which is the Visual Studio solution that builds Python.
  4. Open pcbuild.sln in Visual Studio. (I am assuming you are using Visual Studio 10; readme.txt contains specific instructions for older versions of Visual Studio.)
  5. Make sure Visual Studio is set to the "debug" configuration, and then build the solution for your appropriate architecture (x64 or Win32). You may get a few failed subprojects, but not all of them are necessary to build python33_d; by my count, 8 builds failed and I got a working .lib file anyway.
  6. You will find python33_d.lib and python33_d.dll in either the PCBuild folder (if building Win32) or the amd64 subfolder (if building x64).
10
votes

If you install python via the installers on python.org, you can tell the installer to include the debugging symbols and binaries such as the pythonXX_d.dll file by selecting "Customize Installation" while installing (I think it's on the second customization page). This may be the easiest solution if you're not very savvy at building the project yourself (like me). Too bad I don't see any way to do this with the anaconda distribution.

3
votes

Open Python installer(.exe) -- Modify -- Next -- Enable checkbox Debug Symbols and Libs