Re: [Boost-users] problem with building program_options (VC8)

From: Sergey Skorniakov (s.skorniakov_at_[hidden])
Date: 2007-05-30 11:33:06

> Per http://boost.org/boost-build2/doc/html/bbv2/reference/tools.html#bbv2.reference.tools.compiler.msvc,

> it should have no effect indeed.

Ok, my mistake. 

> 
>> Furthermore, program options library is alignment-sensitive.
> 
> Sorry, what is that, why is that a bad thing, and what are you proposing to
> do about it?

I talk about struct member alignment aka packing. As I see, boost\config\abi\msvc_prefix.hpp and msvc_suffix.hpp were designed especially to prevent situation when program crashes if different alignment was used while building library and application. If I build my program with -Zp4 (structure members aligned to 4 bytes) and boost::program_options without -Zp option (default alignment for MSVC is 8), my program will crashes. But there are no such effect with, for example, serialization or filesystem library. I think that <boost/config/abi_prefix.hpp> and <boost/config/abi_suffix.hpp> should be included in program_options files as it done for other libraries.