Exceptions not caught on AIX 4.3.3 with gcc 3.0.4

Exceptions not caught on AIX 4.3.3 with gcc 3.0.4

[Rémi Zara]

Hi,

I'm trying to use xerces-c++ on AIX 4.3.3, using gcc 3.0.4.
I managed to build the shared xerces library, but I must have done something
wrong since as soon as an exception is thrown, my programs are aborted (in
pthread_kill), dispite the fact that there are appropriate catch statements.
The behavior is the same if the exception is thrown in the shared library or in
my code.

here is my setup:

%g++ -v
Reading specs from /softs/gcc-3.0.4/lib/gcc-lib/powerpc-ibm-aix4.3.3.0/3.0.4/specs
Configured with: ../gcc-3.0.4/configure --prefix=/softs/gcc-3.0.4
--enable-shared --enable-threads=posix --enable-languages=c++,java
Thread model: single
gcc version 3.0.4

Another version of gcc is also installed (2.95.2.1 19991024 (release)) under
/usr/local/bin/
How can I be sure that all the appropriate libraries are used (and that the 2
versions don't mix).

Thanks for your help,

Rémi Zara

-- 
http://www.remi-zara.net/

Re: Exceptions not caught on AIX 4.3.3 with gcc 3.0.4

[John Love-Jensen]

Hi Rémi,

If I recall correctly, exceptions don't work with C++ shared libraries in
3.0.x and earlier.

I know that they didn't work for GCC 2.95, and I know the technical details
why they were broken in 2.95.  (Discovered the hard way, using gdb and a lot
of patience.)

It was supposed to be fixed in 3.0, but I recall (vaguely) that it hadn't
been quite fixed correctly.  I don't know the exact 3.0 details, and I may
be mistaken about 3.0.

Exceptions thrown out of shared libraries MAY have been fixed in 3.1 or 3.2.
I haven't tested them, as we're using a strict C ABI with shared libraries,
so we do not throw exceptions over shared library boundaries.

Note:  with 2.95, one could have a problem even with exceptions throw and
caught WITHIN a shared library.  The library needed to be built a special
way (early binding).

The above is pertinent to SunOS, so may or may not be apropos for AIX.

Possible solutions are to use a static library (.a), or to upgrade to the
latest released GCC (3.2.x).

--Eljay

Re: Exceptions not caught on AIX 4.3.3 with gcc 3.0.4

[Rémi Zara]

Le mardi, 4 fév 2003, à 18:04 Europe/Paris, John Love-Jensen a écrit :

> It was supposed to be fixed in 3.0, but I recall (vaguely) that it 
> hadn't
> been quite fixed correctly.  I don't know the exact 3.0 details, and I 
> may
> be mistaken about 3.0.
>
> Exceptions thrown out of shared libraries MAY have been fixed in 3.1 
> or 3.2.
> I haven't tested them, as we're using a strict C ABI with shared 
> libraries,
> so we do not throw exceptions over shared library boundaries.

My problem happen even if I throw an exception in main() and catch it 
immediately...

> Note:  with 2.95, one could have a problem even with exceptions throw 
> and
> caught WITHIN a shared library.  The library needed to be built a 
> special
> way (early binding).

> The above is pertinent to SunOS, so may or may not be apropos for AIX.
>
> Possible solutions are to use a static library (.a), or to upgrade to 
> the
> latest released GCC (3.2.x).

I guess I will have to try with 3.2.x, then.

Thanks for your help,

Rémi
--
Rémi Zara
web: http://www.remi-zara.net/