[C++-sig] Cygwin and boost::python exceptions

[Brad Bell]

There seems to be a problem with the example on
     
http://www.boost.org/doc/libs/1_45_0/libs/python/doc/v2/exception_translator.html
when I compile it I get the following message:
--------------------------------------------------------------------------
bradbell at apl-9232eef971d ~/pycppad/boost_py
$ g++  -I/usr/include/python2.6 -g -c exception.cpp
exception.cpp: In function `void translate(const my_exception&)':
exception.cpp:14: error: passing `const my_exception' as `this' argument 
of `con
st char* my_exception::what()' discards qualifiers
exception.cpp: In function `void something_which_throws()':
exception.cpp:19: error: expected primary-expression before `...' token
exception.cpp:19: error: expected `;' before `...' token
exception.cpp:21: error: expected primary-expression before `...' token
exception.cpp:21: error: expected `;' before `...' token

bradbell at apl-9232eef971d ~/pycppad/boost_py
$ g++ --version
g++ (GCC) 4.3.4 20090804 (release) 1
--------------------------------------------------------------------------

I have figured out a way around this problem, see the attached file 
exception.sh. This works fine under unix, but under cygwin, the 
exception does not seem to be caught by the python 'except' section of 
the 'try' block.

--------------------------------------------------------------------------
Here is the result of running exception.sh under unix:

[bradbell at localhost trash]$ ./exception.sh
cat << EOF > exception.cpp
g++  -I/usr/include/python2.7 -g -c exception.cpp
g++ -shared  \
     -g \
     exception.o \
     -L/usr/lib -L/usr/lib/python2.7/config  \
     -lboost_python-mt -lpython2.7 \
     -o exception.so
cat << EOF > exception.py
exception.sh: OK
...
--------------------------------------------------------------------------
Here is the result of running under cygwin:

$ ./exception.sh
cat << EOF > exception.cpp
g++  -I/usr/include/python2.6 -g -c exception.cpp
g++ -shared -Wl,--enable-auto-image-base \
         -g \
         exception.o \
         -L/usr/lib -L/usr/lib/python2.6/config  \
         -lboost_python-mt -lpython2.6 \
         -o exception.dll
cat << EOF > exception.py
terminate called after throwing an instance of 'my_exception'
   what():  my error message
./exception.sh: line 97:  2108 Aborted                 (core dumped) 
python exception.py
exception.sh: Error

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