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From: John Maddock (john_at_[hidden])
Date: 2004-10-05 10:06:44

> When compiling the smart pointer tests with gcc 3.4.2 on Tru64, two tests
> fail with an error message. (See )
> As far as I can see, the shared pointer implementation at some point
> includes the "pthread.h" system header file but gcc on Tru64 requires
> that -pthread must be specified on the command line when including this
> header file.
> When running this test with gcc 3.4.2 on Linux the file "pthread.h" is
> also included but gcc doesn't require the addition of -pthread in the
> command line on this platform.
> This leads to the question whether it is ok to include "pthread.h" without
> specifying -pthread on the command line. Does anyone know an answer to
> this?

I think on some platforms <pthread.h> doesn't compile unless _REENTRANT or
some similar compiler-specific magic symbol is defined: in other words it's
an assert that the compiler is indeed in thread safe mode.

It looks to me as though BOOST_HAS_THREADS is getting set unconditionally
for gcc on this platform, and presumably we should only set it when
_REENTRANT is defined (I'm assuming that's the symbol that gets defined when
the -thread option is used - can you check?).

Hold on... checked the output from config_info and looks as though
_REENTRANT *is* defined, so I'm mystified. I also note that the platform is
detected as "generic unix". Do you know what macros gcc defines to identify
this platform?



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