On Sat, Oct 25, 2014 at 11:44 PM, Paul Moore
On 25 October 2014 23:22, Chris Angelico
wrote: On Sun, Oct 26, 2014 at 9:19 AM, Antoine Pitrou
wrote: My point is that your "Windows build" would not have the same behaviour as a MSVC-produced Windows build, and so testing it with it would not certify that your code would actually be compatible with genuine MSVC builds of CPython, which we will not stop supporting.
So you're saying it's impossible to support two compilers?
No, rather that Windows currently only has a single supported compiler (excluding cygwin, which is essentially a different OS). Adding a second compiler doesn't just involve adding support for it - which is all that the people offering mingw patches are doing - but also involves going through the whole CPython ecosystem locating the places where there is an implicit assumption that "all Windows builds use the same compiler" and fixing them. I've already pointed out where this is a question for pip and wheel. Whoever wants to add support for a second compiler needs to be willing to do this part of the job as well.
Handwaving arguments that "it's binary compatible" aren't enough. Prove it.
The msvcrt.dlls that MinGW-w64 depends on are those dating back to Windows XP SP3 / XP64. Ironically, the official Windows CPython doesn't come with any such crt guarantees and you must ensure that the same msvcr??.dll is used for *all* extensions. This puts considerable strain on extension developers to use the correct (or any) version of Visual Studio to build their extensions for CPython on Windows. Also, where are the publicly accessible specifications and other technical descriptions that MinGW-w64 would need to implement strong binary compatibility with MSVC? As a random example, those for C++ name mangling and the PDB file format would be very helpful.
Paul _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/mingw.android%40gmail.com