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Re: RE: exceptions not caught from shared libraries loaded with dlopen
-------- Original-Nachricht --------
> Datum: Fri, 19 Oct 2007 04:29:38 -0700
> Von: "John (Eljay) Love-Jensen" <eljay@adobe.com>
> An: tahoma@gmx.de, gcc-help@gcc.gnu.org
> Betreff: RE: exceptions not caught from shared libraries loaded with dlopen
> Hi Jan,
>
> > I have a real serious problem with g++ version 4.2.1 and lower.
>
> Perhaps.
>
> Or perhaps you have an OS that does not support throwing exceptions across
> shared library boundaries. (In particular, the RTTI of the object is
> strongly linked to the type information in the shared library, and does not
> compare as the same to the type information in the code that catches the
> exception which is strongly linked to a different type information structure.
> The OS does not support vague linkage.)
>
> Which OS are you using?
I forgot to mention, sorry.
...$ g++ -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-targets=all --disable-werror --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.2.1 (Debian 4.2.1-5)
Adding RTLD_GLOBAL to dlopen flags solves the problem for now. I have to investigate further. I stumbled across this behaviour while creating C++ Wrappers for Python with Swig. The order of importing the generated wrapper libraries results in different result. Exceptions thrown in C++ will be caught one time the other time not. So I stripped down the generated wrapper code and tried to emulate Python's import. I do not know whether Python uses RTLD_GLOBAL when importing libraries or not.
Thank you,
Jan
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