Cannot import extensions linked against python3_d.dll debug build on Windows

Bug report

Build a debug version of CPython on Windows.
Build an an extension module linked against this debug CPython's python3_d.dll.

This crashes at runtime with the following error:

ImportError: Module use of python3_d.dll conflicts with this version of Python.

This originates from

cpython/Python/dynload_win.c

Lines 311 to 330 in 7a25310

    
                       PyOS_snprintf(buffer, sizeof(buffer), 
        
           #ifdef _DEBUG 
        
                                     "python%d%d_d.dll", 
        
           #else 
        
                                     "python%d%d.dll", 
        
           #endif 
        
                                     PY_MAJOR_VERSION,PY_MINOR_VERSION); 
        
                       import_python = GetPythonImport(hDLL); 
        
                       if (import_python && 
        
                           _stricmp(buffer,import_python)) { 
        
                           PyErr_Format(PyExc_ImportError, 
        
                                        "Module use of %.150s conflicts " 
        
                                        "with this version of Python.", 
        
                                        import_python); 
        
                           Py_BEGIN_ALLOW_THREADS 
        
                           FreeLibrary(hDLL); 
        
                           Py_END_ALLOW_THREADS 
        
                           return NULL; 
        
                       }

It looks like this code doesn't account for the possibility of linking against python3_d.dll when using a debug build.

Your environment

CPython versions tested on: main branch, 7a25310
Operating system and architecture: Windows 12 amd64

Originally reported to me in PyO3/pyo3#2780

Linked PRs

pythongh-101614: don't treat python3_d.dll as a Python dll

Merge #2937

gh-101614: Don't treat python3_d.dll as a Python DLL when checking ex…

pythongh-101614: Don't treat python3_d.dll as a Python DLL when check…

gh-101614: Don't treat python3_d.dll as a Python DLL when checking ex…

Merge branch 'main' into inlinecomp2

Thanks for the fixes!

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Cannot import extensions linked against `python3_d.dll` debug build on Windows #101614

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	PyOS_snprintf(buffer, sizeof(buffer),
	#ifdef _DEBUG
	"python%d%d_d.dll",
	#else
	"python%d%d.dll",
	#endif
	PY_MAJOR_VERSION,PY_MINOR_VERSION);
	import_python = GetPythonImport(hDLL);

	if (import_python &&
	_stricmp(buffer,import_python)) {
	PyErr_Format(PyExc_ImportError,
	"Module use of %.150s conflicts "
	"with this version of Python.",
	import_python);
	Py_BEGIN_ALLOW_THREADS
	FreeLibrary(hDLL);
	Py_END_ALLOW_THREADS
	return NULL;
	}

Cannot import extensions linked against python3_d.dll debug build on Windows #101614

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hugovk commented on Nov 10, 2023

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Cannot import extensions linked against `python3_d.dll` debug build on Windows #101614