RE: [Boost-Users] linking with boost.threads on solaris 8 with gcc 3.0.3

From: Dale Peakall (dale.peakall_at_[hidden])
Date: 2002-03-29 09:19:55

> -----Original Message-----
> From: John Maddock [mailto:john_maddock_at_[hidden]]
> Sent: 29 March 2002 12:22
> To: Boost-Users_at_[hidden]
> Subject: Re: [Boost-Users] linking with boost.threads on 
> solaris 8 with
> gcc 3.0.3
> 
> 
> > Intriguing, as gcc-3.0.3 doesn't have a -pthread argument.  
> I believe you
> > specify the threading model with a configure argument when 
> building gcc
> now
> > (although I just grabbed pre-built binaries, so I may be wrong).
> 
> I don't know about gcc3, but the way to tell is to do a
> 
> gcc -dumpspecs | less
> 
> and then search for "thread",
> 
> BTW gcc2.95 doesn't have -pthread either: it's spelt 
> -pthreads, note the
> trailing 's' it makes a difference!
> 
> For gcc 2.95 -pthreads is the same as:
> CXXFLAGS=-D_REENTRANT -D_PTHREADS
> LIBS=-lpthread
> 
> You are also correct that you have to specify the thread 
> model when you
> build gcc, that's a precondition for thread safe code, but 
> it's not the end
> of it, without -pthreads (which then defines _REENTRANT) your std lib
> allocator won't be thread safe by default (at least on 2.95).
> 
> BTW I was also wrong about the #pragma implementation hack - 
> it doesn't work
> :-(
> Evidently some of the functions from that header are in the 
> std lib, and
> some aren't, maybe the version of gcc I'm using wasn't built 
> with thread
> support, I don't know (I'm using the sourceforge compile farm 
> for testing
> this so I have no control over the gcc install).  Whatever 
> we're back to
> square one on that one, although at least the release version 
> of the thread
> lib does work.
> 
> John Maddock
> http://ourworld.compuserve.com/homepages/john_maddock/index.htm
> 
> 
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