Re: [boost] [thread] Why is there a restriction for the runtime libraries?

From: Roland Schwarz (roland.schwarz_at_[hidden])
Date: 2004-12-06 05:44:23

Stefan Slapeta wrote:

>
> There are two restrictions in the thread jamfile I don't understand:
>
> - the thread lib must be built with static runtime libraries
> - the thread dll must be built with dynamic runtime libraries
>
> What is the reason for that? Why can't I use the shared rt and link 
> boost.thread statically (and vice versa)???
>
Have a look at the thread on the users list:
Re: [Boost-users] Re: Memory leak reported using threads library

Basically because:
#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

and
Peter Dimov wrote:

> It works as long as you don' allocate in one and delete in the other. 
> C-style interfaces are fine, but passing a std::string from the EXE to 
> the DLL (or vice versa) will fail. shared_ptr will work, though :-) 
> unless you unload the DLL that has created it, of course. Deleting an 
> object with a virtual destructor works, too.

as the explanation of "bad idea".
But perhaps this reasoning should be mad more explicit. At least as an 
extended comment in the autolink file as I already suggested.

Roland