Mark Geisert wrote:
This seems to be a problem setting up a platform-specific build directory. The
sysconfig.py script wants to use "lib." + platform + pythonversion but the
platform string somehow gets corrupted into non-utf8 bytes. For instance,
building Python 3.8 comes up with:
lib.cygwin-\365\377\377o-\377o-3.8
as the directory name. Broken, but could work. The build failure happens because
the script tries to write this directory name into a file but it's not a valid
utf8 string. The directory name should have been:
lib.cygwin-3.2.0-x86_64-3.8
And the corruption is due to something about a recent change to the operation of
Cygwin's uname() function. The change was introduced in Cygwin API version 335;
I'm running 340 on my test machine. This being a fairly recent change might
possibly explain why nobody else has run into this issue yet.
Basically, os.uname within Python is calling Cygwin's uname() passing the address
of a buffer declared to be 'struct utsname'. The structure layout changed in API
335. What I've hit is a mismatch between what Python expects and Cygwin delivers.
I'll move this discussion over to the developers list tomorrow.
..mark
