[Boost-users] Boost.Statechart and Simulink

Subject: [Boost-users] Boost.Statechart and Simulink
From: Derek Ditch (derek.ditch+boost_at_[hidden])
Date: 2008-11-19 22:13:50

I was wondering if there were any known issues with compiling using Matlab's
mex compiler (which in turn uses and links with gcc) and using
Boost.Statechart.  When I implemented my statechart, I tested it using a
separate main() file and it works 100%.  When I compile using mex into a
Matlab MEX file, I seem to lose the functionality of the event triggers.
 I've tried several things to figure out what is happening, but all I can
ascertain is that if I use the iterators state_begin() and state_end() to
access all internal states, the loop never executes.  I tried to dereference
state_begin(), but got a segfault.  My initial approach was to use the
state_downcast<>(), but this didn't work in SImulink either.  My final
suspicion was that it had something to do with the extern "C" business, but
admittedly, I don't understand the effects of this statement other than how
the symbol appears in the library (i.e. avoiding mangling).  I get this same
behavior on OS X 10.5 w/ gcc 4.0.1 as well as on Linux x86_64 with gcc
4.2.4.
If anyone wants to have my Simulink model to test, I could send that as
well.

I've attached the following files:

ctrl_machine.[ch]pp - My state machine implementation/declaration.
main.cpp                - My test program
air_controller.cpp    - The C++ SFunction implementation used in Simulink.

mex uses the following compilation steps with gcc/g++

-> g++-4.2 -c  -I/opt/matlab/extern/include -I/opt/matlab/simulink/include
-DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread
 -DMX_COMPAT_32 -O -DNDEBUG  "ctrl_machine.cpp"

-> g++-4.2 -c  -I/opt/matlab/extern/include -I/opt/matlab/simulink/include
-DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread
 -DMX_COMPAT_32 -O -DNDEBUG  "air_controller.cpp"

-> gcc-4.2 -c  -I/opt/matlab/extern/include -I/opt/matlab/simulink/include
-DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE  -fexceptions -fPIC
-fno-omit-frame-pointer -pthread  -DMX_COMPAT_32 -O -DNDEBUG
 "/opt/matlab/extern/src/mexversion.c"

-> g++-4.2 -O -pthread -shared
-Wl,--version-script,/opt/matlab/extern/lib/glnxa64/mexFunction.map
-Wl,--no-undefined -o  "ctrl_machine.mexa64"  ctrl_machine.o
air_controller.o mexversion.o  -Wl,-rpath-link,/opt/matlab/bin/glnxa64
-L/opt/matlab/bin/glnxa64 -lmx -lmex -lmat -lm -lm

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Thanks,

Derek Ditch