[Python-Dev] Python's Unicode width default (New Py_UNICODE doc)

[M.-A. Lemburg]

Martin v. Löwis wrote:
> M.-A. Lemburg wrote:
> 
>>I think we should remove the defaulting to whatever
>>TCL uses and instead warn the user about a possible
>>problem in case TCL is found and uses a Unicode
>>width which is incompatible with Python's choice.
> 
> -1.

Martin, please reconsider... the choice is between:

a) We have a cross-platform default Unicode width
   setting of UCS2.

b) The default Unicode width is undefined and the only
   thing we can tell the user is:

   Run the configure script and then try the interpreter
   to check whether you've got a UCS2 or UCS4 build.

Option b) is what the current build system implements
and causes problems since the binary interface of the
interpreter changes depending on the width of Py_UNICODE
making UCS2 and UCS4 builds incompatible.

I want to change the --enable-unicode switch back to
always use UCS2 as default and add a new option value
"tcl" which then triggers the behavior you've added to
support _tkinter, ie.

    --enable-unicode=tcl

bases the decision to use UCS2 or UCS4 on the installed
TCL interpreter (if there is one).

-- 
Marc-Andre Lemburg
eGenix.com

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