Re: [Boost-bugs] [Boost C++ Libraries] #8665: Unreachable code warnings in variant.hpp - msvc

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8665: Unreachable code warnings in variant.hpp - msvc
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-06-07 08:38:09

#8665: Unreachable code warnings in variant.hpp - msvc
-------------------------------+---------------------
  Reporter:  hvemha@…          |      Owner:  ebf
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  variant
   Version:  Boost 1.53.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+---------------------

Comment (by hvemha@…):

 Not sure about the warning on line 1017.
 Only got this when building from the command line: cl /W4 /O2 Test.cpp

 A default C++ project in Visual Studio and only changing the warning level
 in release build produces 4 C4702 warnings about line 353 for code.

 It is clearly a bug to reach this line. I think it is the return and not
 the function all producing the warning. Probably an issue with the
 compiler (inline and `__declspec(noreturn)`?).

 Also not sure what you mean by without boost::variant? operator< and
 operator== instantiates know_get, and this in turn results in the warnings
 on line 353.

 Is it possible to just disable the C4702 warning in the never to be called
 operator()(U&)? It should be OK in this case.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8665#comment:2>
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