Uncaught exception when using this gem on iOS

[WaveformDelta]

I am using this gem with the ios-embedded-ruby project and including it in the MRubyiOSExample app. However, including this (or any C++ gem) into the project causes a problem with exception handling when I run it on the device. I can cause an unrecoverable crash with code as simple as:

begin
  raise StandardError, "This is an example error"
rescue => ex
  p "Caught error: #{ex.class}, #{ex.message}"
end

On a device, the raise statement will crash with a SIGABRT on the call to MRB_THROW in the mrb_exc_raise() method in the error.c source file with the message:

libc++abi.dylib: terminating with uncaught exception of type int

Additional information

• This only happens on a device, not a simulator (note that ios-embedded-ruby builds for both targets)
• This is not specific to this gem, but seems to be a problem with building C++ code for iOS; I verified this by making a 'dummy' gem that uses C++ and including only that, and got the same behavior; if I build it as C, the crash doesn't happen
• To get this mruby-marshal gem to build for iOS, I had to replace the mruby-onig-regexp gem dependency with the mruby-pure-regexp gem
• I added the 'conf.cxx' flags to the ios-ruby-embedded Rakefile (copy of the 'conf.cc' flags)
• I tried the enable_cxx_exception and enable_cxx_abi options in the Rakefile, but did not find a combination that solved the problem
• I had to add the -lc++ flag to "Other Linker Flags" in the Xcode project
• I have posted this issue to the ios-ruby-embedded project and StackOverflow as well

[take-cheeze]

I don't know what version of mruby you are using and full Rakefile that cause this issue, so I can't say much about it. Customization isn't bad though makes things hard to verify so I need more information.

As I see, conf.cxx and conf.linker should be clang++ or -x c++(force compiler to treat source as C++ code) should be added. Add -fexceptions to your C compiler flags. I prefer enable_cxx_exception since most C project aren't for C++ compilers.

[WaveformDelta]

Adding -fexceptions was the piece I was missing: with that added, all code now works as expected.

I created a Gist with my modified Rakefile; I included the -x c++ argument to clang even though I found in testing I don't need it. For now, I'm not using the enable_cxx_exception.

I accept this issue as closed. Thank you for your help!!

[take-cheeze]

@WaveformDelta Glad to hear you solved it!