On 9/8/2010 23:34, Mario Emmenlauer wrote: > > Hi, > >> On 9/8/2010 21:26, Sébastien Villemot wrote: >>> Hi, >>> >>> Some extra information on the problem that I described in my previous >>> post, and >>> which I suspect to be a bug in MinGW-w64 for 64-bit platform. >>> >>> I attach a sample testcase, which I compile with: >>> >>> x86_64-w64-mingw32-gcc -g -O2 -fexceptions -Wall -shared >>> -I~/MATLAB/extern/include mextest.c -o mextest.mexw64 >>> -L~MATLAB/bin/win64 -lmex >>> >>> The libmex.dll contains both mexErrMsgTxt() and mexPrintf(). >>> >>> As such, the example makes MATLAB crash. >>> >>> But if I comment out the second function call (mexPrintf()), then the >>> DLL >>> behaves as expected: MATLAB catches the exception thrown by >>> mexErrMsgTxt(), and >>> displays the error message. >>> >>> It is very strangs since having or not the mexPrintf() should not change >>> the >>> result, since it is never reached. >>> >>> So it looks like a compiler bug, unless I’m missing something ? I’m >>> not >>> familiar with exception unwinding, so please forgive my ignorance. >>> >>> Any idea ? >>> >>> Best regards, >> >> Hi, >> >> sorry for the lack of responses, its hard to know what is wrong when >> nobody is familiar with Matlab internals. >> >> How exactly is a matlab exception thrown and caught anyway? > > Please excuse my ignorance, I just read the subject and not the details > but I would like to note that throwing/catching exceptions between DSO's > (dynamically linked objects) can be very tricky with gcc, see > http://gcc.gnu.org/wiki/Visibility > > esp. the Section "Problems with C++ exceptions" > > I couldn't get exceptions to work between DSO's _at_all_ when the > exceptions where defined in a static library. So you might want to > take a close look before using them. Hope this is useful, and if not, > please forgive my ignorance! >
OP says the DLL is C code. Exception doesn't automatically mean C++. ------------------------------------------------------------------------------ This SF.net Dev2Dev email is sponsored by: Show off your parallel programming skills. Enter the Intel(R) Threading Challenge 2010. http://p.sf.net/sfu/intel-thread-sfd _______________________________________________ Mingw-w64-public mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
