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copied!<p>(Sorry, I did a stupid thing, I first wrote the question, and then registered, and now I cannot alter it or comment on the replies, because StackOverflow's engine doesn't think I'm the author. I cannot even properly thank those who replied :( So this is actually an update to the question and comments.)</p> <p>Thanks for all the advice, it's very valuable. As far as I understand with some effort I can link Python statically into a custom DLL, provided that I compile other dynamically loaded extensions myself and link them against the same DLL. (I know I need to ship the standard library too; my plan was to append a zipped archive to the DLL file. As far as I understand, I will even be able to import pure Python modules from it.)</p> <p>I also found an interesting place in <code>dynload_win.c</code>. (I understand it loads dynamic extensions that use Python C API, e.g. <code>_ctypes</code>.) As far as I can see it not only looks for <code>init_ctypes</code> symbol or whatever the extension name is, but also scans the <code>.pyd</code> file's import table looking for (regex) <code>python\d+\.</code> and then compares the found symbol with known <code>pythonNN.</code> string to make sure the extension was compiled for this version of Python. If the import table doesn't have such a symbol or it refers to another version, it raises an error. </p> <p>For me it means that:</p> <ul> <li>If I link an extension against <code>pythonNN.dll</code> and try to load it from my custom DLL that includes a statically linked Python, it will pass the check, but — well, here I'm not sure: will it fail because there's no <code>pythonNN.dll</code> (i.e. even before getting to the check) or it will happily load the symbols?</li> <li>And if I link it against my custom DLL, it will find symbols, but won't pass the check :)</li> </ul> <p>I guess I could rewrite this piece to suit my needs... Are there any other such places, I wonder.</p>

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