[C++-sig] Boost.Python exception problems on AIX 5.3 (compiled with gcc 3.4.3, 64 bit)

[J. Michael Owen]

Hi Ralf,

Yeah, I use that dlopen hack myself on all the platforms where I'm 
using gcc.  I've already tried this to handle this exception problem -- 
at least I think I've done it correctly.  On AIX you can find the 
definitions for these things in /usr/include/dlfcn.h, where I see

#define RTLD_NOW                0x00000002 /* Load object and 
dependents now. */
#define RTLD_GLOBAL             0x00010000 /* Make symbols in this 
module
                                               visible to other dlopens. 
*/

So I've tried setting the following before importing my own test 
modules:

import sys
sys.setdlopenflags(0x00000002|0x00010000)

Unfortunately this has no effect on the problem.  Am I missing 
something in how I'm setting this?

Mike.

> Under Linux I'm importing all extension modules with RTLD_GLOBAL. This 
> is a very old workaround for exception handling problems similar to 
> what you describe, but I'm not sure about the details anymore (e.g. 
> which gcc was the trouble maker).
>
> This is roughly how I import our extensions:
>
>   previous_dlopenflags = sys.getdlopenflags()
>   sys.setdlopenflags(0x100|0x2)
>   import myext
>   sys.setdlopenflags(previous_dlopenflags)
>
> The bit masks are platform specific, RTLD_GLOBAL | RTLD_NOW. If any of 
> this applies to AIX (?) you have to find out somehow what the correct 
> bit masks are.
>
> HTH,
>         Ralf
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