What is this, and how can I get rid of it?
cory@cory2k ~/cvs/Twisted $ python setup.py build -c mingw32 running build running build_py running build_ext error: Python was built with version 6 of Visual Studio, and extensions need to be built with the same version of the compiler, but it isn't installed.
I had no problems building these extensions on Python 2.2 following the instructions at http://sebsauvage.net/python/mingw.html . I did the same thing substituting 2.3 for 2.2, and got the message above.
Why doesn't it work any more? --compiler=mingw32 is still valid on the command line.
Cory Dodt wrote:
What is this, and how can I get rid of it?
cory@cory2k ~/cvs/Twisted $ python setup.py build -c mingw32 running build running build_py running build_ext error: Python was built with version 6 of Visual Studio, and extensions need to be built with the same version of the compiler, but it isn't installed.
I had no problems building these extensions on Python 2.2 following the instructions at http://sebsauvage.net/python/mingw.html . I did the same thing substituting 2.3 for 2.2, and got the message above.
Why doesn't it work any more? --compiler=mingw32 is still valid on the command line.
The above message is generated by the MSVC code, so the only reason I can see is that your option didn't pass through to build_ext.
M.-A. Lemburg wrote:
Cory Dodt wrote:
What is this, and how can I get rid of it?
$ python setup.py build -c mingw32
running build
running build_py
running build_ext
error: Python was built with version 6 of Visual Studio, and extensions
need to
be built with the same version of the compiler, but it isn't installed.
The above message is generated by the MSVC code, so the only
reason I can see is that your option didn't pass through to
build_ext.
The same thing happens invoking build_ext directly, alas:
$ python setup.py build_ext -c mingw32 running build_ext error: Python was built with version 6 of Visual Studio, and extensions need to be built with the same version of the compiler, but it isn't installed.
What is this, and how can I get rid of it?
cory@cory2k ~/cvs/Twisted $ python setup.py build -c mingw32 running build running build_py running build_ext error: Python was built with version 6 of Visual Studio, and extensions need to be built with the same version of the compiler, but it isn't installed.
I had no problems building these extensions on Python 2.2 following the instructions at http://sebsauvage.net/python/mingw.html . I did the same thing substituting 2.3 for 2.2, and got the message above.
Why doesn't it work any more? --compiler=mingw32 is still valid on the command line.
We added an extra sanity check that was intended to guard against someone using a Python built with MSVC 6, say, and a DLL built with MSVC 7. The sanity check is that distutils finds out what compiler was used to build Python, and won't compile extensions with anything else. (I think I added this code.)
When I was working on this, I was not even aware of the --compiler option. I don't know how dangerous it is to use DLLs from one compiler with a Python from a different compiler. I believe David Abrahams was involved in those discussions, and I've seen him here; perhaps he can offer an explanation.
Assuming it is safe to change compilers, it sounds like we need a patch to get 2.3 distutils working with custom compilers. I've never used a compiler other than MSVC on Windows, so I can't be of much help. I can merely confirm it doesn't break things for MSVC.
Jeremy
"Jeremy Hylton" jeremy@alum.mit.edu writes:
We added an extra sanity check that was intended to guard against someone using a Python built with MSVC 6, say, and a DLL built with MSVC 7. The sanity check is that distutils finds out what compiler was used to build Python, and won't compile extensions with anything else. (I think I added this code.)
Er... I can build extensions quite happily with the mingw32 compiler, against a stock Python 2.3 for Windows.
When I was working on this, I was not even aware of the --compiler option. I don't know how dangerous it is to use DLLs from one compiler with a Python from a different compiler. I believe David Abrahams was involved in those discussions, and I've seen him here; perhaps he can offer an explanation.
Code compiled with mingw32 is, by default, compatible with Python built with MSVC6 (both link to msvcrt.dll). There would be incompatibilities if Python was built with MSVC7, as this uses a different C runtime DLL, but it should be possible to supply suitable command line options to the mingw32 compiler to allow compatible extensions to be built. Indeed, I have committed to making sure that happens - although I have no way of doing so until I have access to a Python built with MSVC7 (I don't have that compiler myself, and am not likely to get it).
Assuming it is safe to change compilers, it sounds like we need a patch to get 2.3 distutils working with custom compilers. I've never used a compiler other than MSVC on Windows, so I can't be of much help. I can merely confirm it doesn't break things for MSVC.
As I say, --compiler=mingw32 works fine with the distributed Python 2.3 binary. I imagine that it won't (either the build fails, or the extension is incompatible) with a custom-built-with-MSVC7 Python.
Don't "fix" this, please! It would be a real problem if users couldn't build C extensions with free tools, without having to build the whole Python interpreter as well.
Paul.
participants (4)
-
Cory Dodt -
Jeremy Hylton -
M.-A. Lemburg -
Paul Moore