[Python-Dev] Wrong OSX platform in sysconfig.py causing installation problems

[Joseph Nunn]

Hello Everyone, my first post.  I would also like to subscribe but 
haven't seen how yet.  

So I've an issue with how the 3.5.1 OSX 
package installs on OSX.  The problem was first made apparent 
when trying to create a virtual environment and `pip install ZODB`, 
which failed as clang and the linker could not find either the 
include or lib directories for a dependency.  By adding a -v option
to the compiler options I was able to see in the  compiler flags 
the following:

-isysroot /Developer/SDKs/MacOSX10.6.sdk

Which was not present in the compiler flags of other people 
who I was talking with.  The isysroot flag changes the location 
of includes and libs from the system default, which would be 
why they can't be found.  After grepping around a bit I found 
this file:

/Library/Frameworks/Python.framework/Versions/3.5
/lib/python3.5/_sysconfigdata.py

Within which are many mentions of this flag, as so:

'CONFIGURE_CFLAGS': '-arch i386 -arch x86_64 -isysroot 
/Developer/SDKs/MacOSX10.6.sdk -g',
'CONFIGURE_CFLAGS_NODIST': '-Werror=declaration-after
-statement',
'CONFIGURE_CPPFLAGS': 
'-isysroot /Developer/SDKs/MacOSX10.6.sdk',
'CONFIGURE_LDFLAGS': '-arch i386 -arch x86_64 -isysroot 
/Developer/SDKs/MacOSX10.6.sdk -g',
'CONFIG_ARGS': "'-C' '--enable-framework' '--enable-
universalsdk=/Developer/SDKs/MacOSX10.6.sdk' 
'--with-universal-archs=intel' 
'--with-computed-gotos' '--without-ensurepip' 'LDFLAGS=-g'
'CFLAGS=-g' 

'CC=gcc-4.2'",

among others.

By running Python 3.5's sysconfig.py as a module, via 
`python -m sysconfig`, I see the following at the beginning 
of the output:

Platform: "macosx-10.6-intel"
Python version: "3.5"
Current installation scheme: "posix_prefix"

And when I simply go into python interactive mode, import 
sysconfig, and type 

sysconfig.get_platform() it returns macosx-10.6-intel.

I believe somehow the platform being reported is incorrect, 
but looking at my environment, I do not have any kind of 
compiler flags or anything else like that set 

in my bash init files.

Can someone who has a working OSX 3.5 installation check 
their reported platform to see what it is and if anyone has an 
idea as to how this information is getting into the installation 
and where I might change it please let me know. 

Sincerely,

Joseph
josephnunn at gmail.com