Re: exception problem with cygwin - terminate called recursively

Philipp Kraus <>
Sun, 17 Jul 2011 11:18:24 +0200
On 2011-07-17 09:30:14 +0200, Paavo Helde said:

Philipp Kraus <> wrote in

The original excerpt of the method is:

bool l_error = false;

xmlGenericErrorFunc l_fptr = myclass::XMLErrorFunction; <=
XMLErrorFunction is a static
method of the class which is empty to supress
parsing content on the CLI
initGenericErrorDefaultFunc( &l_fptr );

initGenericErrorDefaultFunc() expects a normal function pointer, using a
static class method is formally UB, though it works in most

So myclass::XMLErrorFunction() is empty as you claim. Have you put some
debug output there to see if it is really called or not.

Yes, I do. If I set a std::cout in the function, on an error the text is shown.

const char* l_xmlcontent = p_xml.c_str();
xmlDocPtr l_xml = xmlParseMemory( l_xmlcontent,
strlen(l_xmlcontent) );
if ((!l_xml) || (xmlGetLastError())) {
if (l_xml)
xmlFreeDoc( l_xml );
throw std::runtime_error("XML data can not be parsed");
this exception is thrown, but can not be caught /
here I have tested with std::exception,
derivated exceptions...

According to your descriptions (still no compilable code!) there is
nothing to do with libxml2. You just throw an exception in one function
and attempt to catch it in the immediate caller function. If this does
not work, this probably means that your program state is fully corrupt,
or that you do something else illegal.

Why is this "fully corrupt"? On different OS there is a different
behavior, only
Windows creates a problem. It seems that the binary code under Windows
is different from the code on Linux or OSX for catching exceptions. I've tested
another example with a Boost exception (I will catch the exception of a
lexcial cast).
Linux and OSX do it in a correct way, raises the exception and caught
it. On Windows
the exception raises, but the catch block will be ignored and I'll get
the error with
the "terminate line".

I don't think the code is corrupted, because on this point Linux and
OSX should not
be work also. My question is there a compiler flag or anything else,
that I must note
if I run code under Cygwin / Windows? Is exception calling / handling
different than other OS?

I'm not sure, if this a problem of my code or a problem of the
compiling / linking step or compiler?
I have tested the code on OSX 10.5, 10.6 and Linux x64 (always with g++
and self-build libraries)
so only on Windows x32 the problem with the exception is shown.

Are you sure this is the only exception being thrown? Set a breakpoint on
throw (should be 'catch throw' or 'break __cxa_throw' in gdb) and make
sure the excptions occur there where you think.

Yes I'm sure, therefor I have checked with gdb and the __cxa_throw is show
on Windows in the gdb and with "bt" the method and exactly this throw is found.

I think such error message typically means that an exception is thrown
while the call stack is being unwind as a result of another exception
throw. In your example code there is only one throw, so I guess the error
is in the code you have left out from the example. Please post a
compilable example demonstrating the problem

I will try to create an example which demonstrate the problem.

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