[ python-Bugs-1005113 ] test__locale fails on MacOS X

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Bugs item #1005113, was opened at 2004-08-07 15:23
Message generated for change (Comment added) made by ronaldoussoren
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Category: None
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Ronald Oussoren (ronaldoussoren)
Assigned to: Nobody/Anonymous (nobody)
Summary: test__locale fails on MacOS X

Initial Comment:
test__locale fails on MacOS X. It didn't with Python 2.3.

I've written a small C program that can reproduce the problem:


------------ testme.c -------
#include <locale.h>
#include <stdio.h>

int main(void)
{
        char* s;
        struct lconv* conv;

        s = setlocale(LC_NUMERIC, "it_IT");
        printf("setlocale returned: %s\n", s);

        conv = localeconv();
        printf("conv->decimal_point == %s", conv->decimal_point);

        return 0;
}
---------------

Compile this with 'cc -o testme testme.c' and it prints the right 
anwser. 

Compile this with 'cc -o testme testme.c -framework Foundation' or 
'cc -o testme testme.c -framework CoreServices' and it fails'

Python is linked with both frameworks....

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>Comment By: Ronald Oussoren (ronaldoussoren)
Date: 2004-08-12 21:40

Message:
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Many thanks to Bob Ippolito for finding what's going on...

It turns out that CoreFoundation.framework calls 
__setonlyClocaleconv when it is loaded. As the name suggests this 
breaks the locale API's. I don't know what whoever added this 
"functionality" was smoking, but at least he had enough sense to make it 
possible to restore functionality.

The prototype for __setonlyClocaleconv is: extern int 
__setonlyClocaleconv(int val);

Experimentation shows that setting val to a non-zero value breaks 
setlocale and setting it to 0 re-enables setlocale. The function returns the 
previous setting.

This means it is possible to create a workaround for this issue:

1) Add configure and/or weak-linking magic to detect the function
2) Call oldValue = __setonlyClocaleconv(0) before using a locale API
3) Call __setonlyClocaleconv(oldValue) after doing so.

Would such a patch be accepted?

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Comment By: Brett Cannon (bcannon)
Date: 2004-08-07 21:14

Message:
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Ah!  Nick Bastin and I were trying to solve this and noticed that in a 
straight C program it worked but under Python, no matter where you 
were, it was incorrect!  Thanks for the insight!

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Comment By: Ronald Oussoren (ronaldoussoren)
Date: 2004-08-07 17:10

Message:
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Because this seems to be a bug in OSX I've filed a bug at 
bugreport.apple.com (radar#3754835)

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1005113&group_id=5470