[Python-Dev] Linux Python linking with G++?

[Ulrich Berning]

David Abrahams schrieb:

>"Martin v. Löwis" <martin at v.loewis.de> writes:
>
>  
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>>David Abrahams wrote:
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>>>Unless, of course, I'm missing something.  So if I am missing
>>>something, what is it?
>>>      
>>>
>>You are missing something, and I can only repeat myself. Some systems
>>require main() to be compiled as C++, or else constructors may not work
>>(and perhaps other things fail as well). 
>>    
>>
>
>Yes, and that becomes important in programs that have constructors.
>I.e., C++ programs.  The Python executable is not such a program,
>except for one C++ file: ccpython.cc.  There is no reason that file
>couldn't be rewritten as a pure 'C' file and any need for Python to be
>linked with G++ would disappear.
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>>The configure option --with-cxx (documented as "enable C++ support")
>>make Python C++ options 
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>What are "Python C++ options?"
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>>work on such systems. It is automatically enabled if a C++ compiler
>>is found.
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>>There is configure auto-detection for what linker is used when
>>ccpython.o becomes main().
>>
>>This is the state of the things as it is. In what way would you like to
>>see that state changed?
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>I would like the Python executable never to be linked (or compiled
>either) by g++ unless that is explicitly requested by the person
>invoking configure or make.
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>>I could personally accept if ccpython and --with-cxx would be dropped
>>entirely (i.e. deliberately breaking systems which require it); 
>>    
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>I don't believe any systems require it.  I realize you have said
>otherwise, but after years of working with Boost.Python I'm very
>familiar with the issues of dynamic linking and C/C++ interoperability
>on a wide variety of platforms, and I'm not convinced by your
>assertion.  If such a system exists, it should be easy for someone to
>point me at it, and show that something breaks.
>
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If you build C++ extensions on HP-UX with aCC, Python must be compiled 
and linked as a C++ program. This is documented.
It will not work if Python is compiled and linked as a normal C program 
(I have tried it). I haven't tried gcc on this platform, but I guess it 
is the same (compile and link with g++).

Ulli