On 02/18/2010 04:24 PM, James Amundson wrote:
Boost Python seems to be failing to catch and translate C++ exceptions
for me on a BlueGene/P installation. I really don't know what to do
next in debugging the problem, so I would appreciate any advice.
I have finally solved this problem myself -- I am responding to my own
message on these mailing lists in case this information is useful to
others.
In the end the solution was to add the flag "-dynamic" to the
libboost_python link line. Without the flag, boost::python mostly works
on BlueGene/P, but exceptions are not caught. With the flag,
boost_python passes all tests I have done.
I spent some time trying to understand how to tell bjam to add a flag to
the boost_python link line, but I gave up after about fifteen minutes.
With the CMake build of boost, it was easy: I simply did
cmake -DCMAKE_SHARED_LINKER_FLAGS="-dynamic"
Overall, I found dealing with the cmake build of boost so much more
pleasant than dealing with bjam that I don't understand why the CMake
build hasn't taken over the mainstream yet.
--Jim Amundson
P.S. The original problem report:
I have a simple test module, pyexcept
------------------------------------------------------------
#include <boost/python.hpp>
#include <iostream>
#include <stdexcept>
void
foo()
{
std::cout << "in foo, about to raise exception\n";
throw std::runtime_error("runtime_error from foo");
std::cout << "this should never be seen\n";
}
using namespace boost::python;
BOOST_PYTHON_MODULE(pyexcept)
{
def("foo",foo);
}
------------------------------------------------------------
I test it with the following python script:
------------------------------------------------------------
#!/usr/bin/env python
import pyexcept
print "about to run pyexcept.foo, catching exception"
try:
pyexcept.foo()
except RuntimeError,e:
print "caught RuntimeError,",e
------------------------------------------------------------
On my Linux machine I see:
------------------------------------------------------------
about to run pyexcept.foo, catching exception
in foo, about to raise exception
caught RuntimeError, runtime_error from foo
------------------------------------------------------------
On the BlueGene/P machine I see:
------------------------------------------------------------
about to run pyexcept.foo, catching exception
in foo, about to raise exception
terminate called after throwing an instance of 'std::runtime_error'
what(): runtime_error from foo
------------------------------------------------------------
I have (cross-)compiled boost myself using the system's installed
version of the gnu compilers, 4.1.2:
------------------------------------------------------------
|login2>mpicxx.gnu --version
powerpc-bgp-linux-g++ (GCC) 4.1.2 (BGP)
------------------------------------------------------------
(The mpicxx.gnu script is a wrapper around the cross-compiling g++.)
Has anyone seen a problem like this? Any ideas as to how to debug it?
Thanks for any advice.
--Jim Amundson
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