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POGCC 4.5, boost and throw_error_already_set
 

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  1. POGCC 4.5, boost and throw_error_already_set
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    <p>Using Python 2.2.3, Boost 1.46 and this trivial extension module:</p> <pre><code>#include &lt;Python.h&gt; #include &lt;boost/python.hpp&gt; using namespace boost::python ; using namespace boost; class PyTest { public: PyTest(); }; PyTest::PyTest() { PyErr_SetString(PyExc_RuntimeError, "FOO"); throw_error_already_set(); } BOOST_PYTHON_MODULE(testmod) { class_&lt;PyTest&gt;("Test", init&lt;&gt;()) ; } </code></pre> <p>If I build Boost, then this module, using GCC 3.4.5 (Mingw on XP SP3), everything works well:</p> <pre><code>&gt;&gt;&gt; import testmod &gt;&gt;&gt; testmod.Test() Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in ? RuntimeError: FOO </code></pre> <p>Not changing anything but the compiler (GCC 4.5.2) gives this:</p> <pre><code>&gt;&gt;&gt; import testmod &gt;&gt;&gt; testmod.Test() This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. </code></pre> <p>So I launch gdb and put a break on abort. Seems to me like the error_already_set exception isn't catched by anybody:</p> <pre><code>(gdb) bt #0 0x77c36bb3 in msvcrt!abort () from C:\WINDOWS\system32\msvcrt.dll #1 0x69acfdb2 in testmod!_Unwind_SetGR () from C:\Python22\DLLs\testmod.pyd #2 0x69b2a45d in testmod!_ZNK5boost6python7objects23caller_py_function_implINS0 _6detail6callerIPFvP7_objectENS0_21default_call_policiesENS_3mpl7vector2IvS6_EEE EE9signatureEv () from C:\Python22\DLLs\testmod.pyd #3 0x6e9544a3 in libgcc_s_dw2-1!__trunctfxf2 () from C:\WINDOWS\system32\libgcc_s_dw2-1.dll #4 0x6e954877 in libgcc_s_dw2-1!_Unwind_RaiseException () from C:\WINDOWS\system32\libgcc_s_dw2-1.dll #5 0x6fcbc6e2 in libstdc++-6!__cxa_throw () from C:\WINDOWS\system32\libstdc++-6.dll #6 0x63455d4c in boost::python::throw_error_already_set() () from C:\WINDOWS\system32\libboost_python-mgw45-mt-1_46_1.dll #7 0x69ac12de in testmod!_ZN6PyTestC2Ev () from C:\Python22\DLLs\testmod.pyd #8 0x69adbbf1 in testmod!_ZN5boost6python7objects11make_holderILi0EE5applyINS1_ 12value_holderI6PyTestEENS_3mpl7vector0IN4mpl_2naEEEE7executeEP7_object () from C:\Python22\DLLs\testmod.pyd #9 0x69adbde9 in testmod!_ZN5boost6python7objects23caller_py_function_implINS0_ 6detail6callerIPFvP7_objectENS0_21default_call_policiesENS_3mpl7vector2IvS6_EEEE EclES6_S6_ () from C:\Python22\DLLs\testmod.pyd #10 0x63450031 in boost::python::objects::function::call(_object*, _object*) con st () from C:\WINDOWS\system32\libboost_python-mgw45-mt-1_46_1.dll #11 0x634501fb in boost::detail::function::void_function_ref_invoker0&lt;boost::pyt hon::objects::(anonymous namespace)::bind_return, void&gt;::invoke(boost::detail::f unction::function_buffer&amp;) () from C:\WINDOWS\system32\libboost_python-mgw45-mt-1_46_1.dll #12 0x63455e5a in boost::python::handle_exception_impl(boost::function0&lt;void&gt;) () from C:\WINDOWS\system32\libboost_python-mgw45-mt-1_46_1.dll #13 0x634512be in function_call () from C:\WINDOWS\system32\libboost_python-mgw45-mt-1_46_1.dll #14 0x1e006ccc in python22!PyObject_Call () from C:\WINDOWS\system32\python22.dll #15 0x0089d138 in ?? () #16 0x63469420 in boost::python::docstring_options::show_py_signatures_ () from C:\WINDOWS\system32\libboost_python-mgw45-mt-1_46_1.dll #17 0x0084d0f0 in ?? () Backtrace stopped: previous frame inner to this frame (corrupt stack?) </code></pre> <p>The funny thing is that in my actual use case, the class has several methods wrapped; for some of them the error_already_set mechanism works; for some others it doesn't... Does a C++ guru have any hint about this ?</p>
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