Re: [Boost-users] New compiler warnings triggered by Boost 1.36

From: cowwoc (cowwoc_at_[hidden])
Date: 2008-08-15 03:02:13

Will do, thanks for the clarification!

Gili

Anthony Williams-4 wrote:
> 
> cowwoc <cowwoc_at_[hidden]> writes:
> 
>> When I compile my code against Boost 1.36 I get:
>>
>> 3>C:\Program Files\boost_1_36_0\boost/config/abi_prefix.hpp(19) : warning
>> C4103: 'c:\program files\boost_1_36_0\boost\config\abi_prefix.hpp' :
>> alignment changed after including header, may be due to missing #pragma
>> pack(pop)
> 
> [snipped similar warnings]
> 
>> I don't recall seeing this in 1.35 and I compiled against it two days
>> ago. I
>> am compiling under Visual Studio 2008, in x64 mode. How do I fix these
>> warnings?
> 
> Disable the warning in the Visual Studio project settings.
> 
> These warnings are because the thread library now saves and restores
> the alignment settings using the boost abi_prefix.hpp and
> abi_suffix.hpp headers (whereas it didn't in 1.35). Because the
> necessary pragmas are in separate headers (push in abi_prefix, pop in
> abi_suffix) the compiler is warning about it.
> 
> This is necessary because otherwise code compiled with non-standard
> alignment may have subtle bugs due to the alignment changing (and thus
> structure layout changing) between the compiled thread library and the
> included headers.
> 
> Anthony
> -- 
> Anthony Williams            | Just Software Solutions Ltd
> Custom Software Development | http://www.justsoftwaresolutions.co.uk
> Registered in England, Company Number 5478976.
> Registered Office: 15 Carrallack Mews, St Just, Cornwall, TR19 7UL
> 
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> 

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