I believe '<link>shared' could do the job in bjam. 2010/2/24 James Amundson

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 #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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