Re: [Boost-bugs] [Boost C++ Libraries] #775: Warnings on MSVC 2005

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #775: Warnings on MSVC 2005
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2007-05-21 15:37:31

#775: Warnings on MSVC 2005
--------------------+-------------------------------------------------------
  Reporter:  e4lam  |       Owner:  johnmaddock
      Type:  Bugs   |      Status:  assigned   
 Milestone:         |   Component:  config     
   Version:  None   |    Severity:  Problem    
Resolution:  None   |    Keywords:             
--------------------+-------------------------------------------------------
Changes (by grafik):

  * component:  build => config
  * severity:  => Problem

Old description:

> {{{
> I've found that when using Boost on Microsoft Visual Studio C++ 2005, I
> get warning C4103 when
> including any boost header which end up including:
>
> abi_{prefix,suffix}.hpp
> (eg. iostreams/filter/zlib.hpp)
>
> or which manually performs a
>
> #include BOOST_ABI_{PREFIX,SUFFIX}
> (eg. regex/v4/regex_traits_defaults.hpp).
>
> An explanation for the warning can be found here:
> http://windowssdk.msdn.microsoft.com/en-us/library/t4d0762d.aspx

>
> What is happening is that config/abi/msvc_{prefix,suffix}.hpp performs
> "#pragma
> pack(push,8)" (in msvc_prefix.hpp) and then performs a "#pragma
> pack(pop)" (in msvc_suffix.hpp). This leads the compiler to think that
> the packing alignment has erroneously changed, generating unnecessary
> warnings.
> }}}

New description:

 {{{
 I've found that when using Boost on Microsoft Visual Studio C++ 2005, I
 get warning C4103 when
 including any boost header which end up including:

 abi_{prefix,suffix}.hpp
 (eg. iostreams/filter/zlib.hpp)

 or which manually performs a

 #include BOOST_ABI_{PREFIX,SUFFIX}
 (eg. regex/v4/regex_traits_defaults.hpp).

 An explanation for the warning can be found here:
 http://windowssdk.msdn.microsoft.com/en-us/library/t4d0762d.aspx


 What is happening is that config/abi/msvc_{prefix,suffix}.hpp performs
 "#pragma
 pack(push,8)" (in msvc_prefix.hpp) and then performs a "#pragma pack(pop)"
 (in msvc_suffix.hpp). This leads the compiler to think that the packing
 alignment has erroneously changed, generating unnecessary warnings.
 }}}

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/775#comment:1>
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