Re: [Boost-users] Problems with boost::filesystem::path continued

From: John Maddock (john_at_[hidden])
Date: 2005-04-27 04:43:40

>I found the main problem, I had edited the wrong boost/config/user.hpp 
>file.
> When I set BOOST_FILESYSTEM_DYN_LINK in the correct user.hpp file I get 
> this
> error.
>
> c:\Boost\include\boost-1_31\boost\config\auto_link.hpp(269): fatal error
> C1189: #error :  "Mixing a dll boost library with a static runtime is a
> really bad idea..."
>
> #if (defined(_DLL) || defined(_RTLDLL)) && defined(BOOST_DYN_LINK)
> #  define BOOST_LIB_PREFIX
> #elif defined(BOOST_DYN_LINK)
> #  error "Mixing a dll boost library with a static runtime is a really bad
> idea..."
> #else
> #  define BOOST_LIB_PREFIX "lib"
> #endif
>
> So wher am I supposed to set the _DLL symbol or do I need to disable
> auto_link. If so how?

The message tells you what you've done wrong: you can not use a dll that 
passes C++ objects between itself and your application unless you are also 
using a dll runtime library.  If you do manage to do this your code will 
very likely crash and burn at runtime (due to recourses being allocated and 
freed by differing C++ runtimes).  If you switch your code generation 
options (in the VC++ IDE) to use a dll runtime then the error message will 
go away.

John.