[Bug python/23830] use the stable python 3 ABI

[Bug python/23830] use the stable python 3 ABI

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23830

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I looked at this a little.

Buffer objects aren't in the stable API, see

https://github.com/python/cpython/issues/89622

PyTypeObject is opaque in the stable API, so we'd have
to change all the types to use PyType_FromSpec.

https://docs.python.org/3/c-api/type.html#c.PyType_Spec

This one doesn't seem so hard, though I didn't look to
see if everything gdb needs here is available.

There's this error:

../../binutils-gdb/gdb/python/py-gdb-readline.c:58:29: error:
‘_PyOS_ReadlineTState’ was not declared in this scope

I wonder if we could ever handle that one.  This readline stuff
was maybe a mistake.


../../binutils-gdb/gdb/python/py-gdb-readline.c:67:20: error: ‘PyMem_RawMalloc’
was not declared in this scope; did you mean ‘PyMem_Realloc’?

There seem to be other stable malloc APIs, maybe those can be used instead.


../../binutils-gdb/gdb/python/py-gdb-readline.c:97:7: error:
‘PyRun_SimpleString’ was not declared in this scope; did you mean
‘Py_CompileString’?

Would need a rewrite.


I think there more problems as well, but it's hard to see them through
all the noise of the repeated error messages.  Anyway this project
remains out of reach still.

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[Bug python/23830] use the stable python 3 ABI

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23830

--- Comment #2 from Tom Tromey <tromey at sourceware dot org> ---
Oh, forgot to mention, we need at least 3.3 to pick up
PyArg_VaParseTupleAndKeywords.

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