Mark Hammond wrote:
On 23/02/2009 11:41 PM, Chris Cormie wrote:

If that not-very-technical description [all I've ever needed] doesn't
help, you'll need to read the DW help file (HTFF1K) or wait till
someone who knows what they are doing comes along :-)

LOL, I am that person :p

LOL sounds right!

How do you get *Python* to tell you the dll and the problem symbol? Not
external tools, Python. Python at a low level is calling LoadLibrary and
GetProcAddress to resolve symbols and the call fails.

It is the LoadLibrary that is failing; it should be obvious that if it was a simple GetProcAddress that was failing, Python would simply throw an exception rather than displaying the ugly dialog box you see.

The problem is that some *other* DLL in the chain of dependencies is failing to load; please re-adjust your perceptions of your own knowledge and re-read John's initial response - if you follow his instructions that should all become quite obvious.

Mark

I think an example would help rather than me jabbering on about LoadLibary/GetProcAddress .

It really is a case of Python loads module x depending on DLL y that is missing symbol z, yet the error message is just "load x failed" when in theory it could be "load x failed: y doesn't have z".

However I think I am confusing people (and myself!) by assuming it's always as explicit as a LoadLibary/GetProcAddress sequence that is failing when people see this error.

Let me explain by giving the specific example case I have to hand.
I originally got on to this class of opaque runtime errors caused by missing symbols through building the pycURL extension on MinGW. As of Python 2.6, Python links against the new msvcr90.dll C Runtime. MinGW maintains a set of .a files for system DLLs including the C Runtime. When building pycURL naturally I want to link against libmsvcr90.a so Python 2.6 and pycURL are using the same C Runtime. Problem was, MinGW's .a was wrong: it exports symbols that msvcr90.dll does not in fact possess. Building pycURL with the faulty libmsvcr90.a causes the opaque error message: "ImportError: DLL load failed"

I think Gabriel's got the part of the answer: she said "it isn't Python who's trying to load the symbol - the *only* symbol that Python attempts to import itself is "initFOO" from FOO.pyd"

So my next question is: given the above missing-symbol problem, is the system able/willing to report the bad symbol reference in the .pyd when Python attempts to import initFOO?

Regards,
Chris.

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