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

Will do, thanks for the clarification! Gili Anthony Williams-4 wrote:

cowwoc 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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