Re: [boost] boost/config/suffix.hpp: spurious BOOST_HAS_THREADS withg++ 3.4

From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-05-12 05:56:49

John Maddock wrote:
> It looks as though _GLIBCXX_HAVE_GTHR_DEFAULT is defined by the std lib
> when it's in thread safe mode, so I'm leaning towards adding:
>
> #ifdef __GLIBCXX__ // gcc 3.4 and greater:
> #ifdef _GLIBCXX_HAVE_GTHR_DEFAULT
> #define BOOST_HAS_THREADS
> #else
> #define BOOST_DISABLE_THREADS
> #endif
> #endif
>
> To our libstdcpp3.hpp config file, which I think will take care of it,
> albeit not in a way that everyone will appreciate (it will force threading
> on whenever the std lib is also thread safe).

Ehm... I don't think Linux has single-threaded and multi-threaded versions of 
libstdc++ -- there's only one library installed and it's sure will be 
multi-threaded. 

So, for single threaded builds 
1. Boost will think it's MT build and call pthread_* functions.
2. Toolset won't add '-pthread' to linker command line 

Bottom like: you'll get link failures for single-thread builds.

- Volodya