[Boost-users] compiler crash in signals2?

Subject: [Boost-users] compiler crash in signals2?
From: Noah Roberts (roberts.noah_at_[hidden])
Date: 2011-04-08 13:54:18

I get this error:
1>------ Build started: Project: barf, Configuration: Debug Win32 ------
1>  main.cpp
1>  using native typeof
1>d:\boost-1.42.0-msvc10\boost-1.42-msvc10\include\boost\smart_ptr\shared_ptr.hpp(231): 
fatal error C1001: An internal error has occurred in the compiler.
1>  (compiler file 'msc1.cpp', line 1420)
1>   To work around this problem, try simplifying or changing the 
program near the locations listed above.
1>  Please choose the Technical Support command on the Visual C++
1>   Help menu, or open the Technical Support help file for more information
1> 
d:\boost-1.42.0-msvc10\boost-1.42-msvc10\include\boost\signals2\detail\signal_template.hpp(699) 
: while compiling class template member function 'boost::shared_ptr<T> 
boost::signals2::signal1<R,T1,Combiner,Group,GroupCompare,SlotFunction,ExtendedSlotFunction,Mutex>::lock_pimpl(void) 
const'
1>          with
1>          [
1>              T=void,
1>              R=void,
1>              T1=const esi::units::unit_settings &,
1>              Combiner=boost::signals2::optional_last_value<void>,
1>              Group=int,
1>              GroupCompare=std::less<int>,
1>              SlotFunction=boost::function<void (const 
esi::units::unit_settings &)>,
1>              ExtendedSlotFunction=boost::function<void (const 
boost::signals2::connection &,const esi::units::unit_settings &)>,
1>              Mutex=boost::signals2::mutex
1>          ]
1> 
d:\boost-1.42.0-msvc10\boost-1.42-msvc10\include\boost\signals2\preprocessed_signal.hpp(42) 
: see reference to class template instantiation 
'boost::signals2::signal1<R,T1,Combiner,Group,GroupCompare,SlotFunction,ExtendedSlotFunction,Mutex>' 
being compiled
1>          with
1>          [
1>              R=void,
1>              T1=const esi::units::unit_settings &,
1>              Combiner=boost::signals2::optional_last_value<void>,
1>              Group=int,
1>              GroupCompare=std::less<int>,
1>              SlotFunction=boost::function<void (const 
esi::units::unit_settings &)>,
1>              ExtendedSlotFunction=boost::function<void (const 
boost::signals2::connection &,const esi::units::unit_settings &)>,
1>              Mutex=boost::signals2::mutex
1>          ]
1> 
d:\dev_workspace\pfp_qt\experiment\build\include\esi\units\unit_settings.hpp(284) 
: see reference to class template instantiation 
'boost::signals2::signal<Signature>' being compiled
1>          with
1>          [
1>              Signature=void (const esi::units::unit_settings &)
1>          ]
========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped ==========

The version of boost I'm using is 1.42.  I'm wondering if this problem 
has turned up before and if its got a fix.

I'm not entirely convinced that it actually has anything to do with what 
it's claiming the cause is.  I'm working on a library that does a lot of 
recursive template instantiations and behaves in a similar manner to 
fusion in many respects.  Previous directions I went with this library 
already cause compiler crashes on a regular basis (2010 apparently 
doesn't do well with recursive calls to auto->decltype template 
functions).  My library code could certainly use some cleaning up, but 
it's all legal C++ as far as I can tell.

Also, this crash only happens when I try to use in conjunction with said 
library and only happens when the construct containing the signal is in 
a particular header file.  If I move it to another and go ahead and 
include that one...everything works just fine.

Obviously, this is VS's fault, not mine or boost's...but if there's a 
workaround/fix that's been made for this problem (assuming it is related 
to signals2 and comes up for other people) I'd like to be aware of it.