[boost] [Boost-bugs] [ boost-Bugs-1596577 ] Warnings on MSVC 2005

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-11-14 15:53:10

Bugs item #1596577, was opened at 2006-11-14 15:53
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Category: build
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: e4lam (e4lam)
Assigned to: Nobody/Anonymous (nobody)
Summary: Warnings on MSVC 2005

Initial Comment:
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.

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