This is primarily a Cxx.jl issue, though you might run into problem if you're trying to unwind through non-C++ frames later. In any case, in the spirit of experimentation, you can enable exception handling by setting the appropriate options from here:
https://github.com/llvm-mirror/clang/blob/master/include/clang/Basic/LangOptions.def#L106-L109 in bootstrap.cpp, e.g. here: https://github.com/Keno/Cxx.jl/blob/master/src/bootstrap.cpp#L464 On Sun, Nov 30, 2014 at 5:59 PM, Max Suster <mxsst...@gmail.com> wrote: > Hi > > I am not very familiar with the mechanics of exception handling in Clang > and I realize that exceptions (throw/catch) work well in Julia itself. > However, I am specifically trying to use exception handling in C++ code > nested inside Julia with Cxx.jl. I noticed exception handling is meant to > be switched off by default in Clang, but still it seems to me that it would > be very useful to have it switched on when dealing with GUI applications. > > I tried several C++ exceptions (e.g., throw/catch, std::exception) but it > seems they are disabled in my current Julia-v0.4.0-dev build (OSX 10.9.5). > Since I did not use the -fno-exceptions flag to build Julia, I wonder > why/where exceptions are switched off when I built Julia. > > In Xcode(with libc++-LLVM, C++11), I can run the following script with > C++ exceptions and it works: > > const int ZeroDivisionError = 1; > double divide(double x, double y) > { > if(y==0) > { > throw ZeroDivisionError; > } > return x/y; > } > > int main() > { > try > { > divide(1, 0); > } > catch(int i) > { > if(i==ZeroDivisionError) > { > std::cerr<<"Divide by zero error"; > } > } > } > > *Divide by zero error *Program ended with exit code: 0 > However, when I try to compile essentially the same code in Julia (with > Cxx), I see the following ERROR: > > julia> cxx""" > #include <iostream> //std::cerr > const int ZeroDivisionError = 1; > double divide(double x, double y) > { > if(y==0) > { > throw ZeroDivisionError; > } > return x/y; > } > > void exceptiontest() > { > try > { > divide(1, 0); > } > catch(int i) > { > if(i==ZeroDivisionError) > { > std::cerr<<"Divide by zero error"; > } > } > } > > In file included from :1: > :9:25: error: cannot use 'throw' with exceptions disabled > throw ZeroDivisionError; > ^ > :16:20: error: cannot use 'try' with exceptions disabled > try > ^ > > Does anyone know how I can switch on exception handling in Clang for > building Julia? > Alternatively, if the exception flag is already included by default, then > at least I know to focus on why it is not being used by Cxx. > > Thank you for your time. > > Max >
