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Date: Wed, 29 Apr 2009 02:13:17 -0700 (PDT)
From: Casull <aphex001 AT hotmail DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: GCC 4.4.0 - Can't activate threading support
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Well actually, maybe saying that threading isn't activated is not the
correct way to describe my problem. I am basically trying to take advantage
of the C++0x implementation provided by GCC 4.4 through the <thread> header
for example. The GCC 4.4 implementation of std::thread is guarded by the
following preprocessing directive:

   #if defined(_GLIBCXX_HAS_GTHREADS) &&
defined(_GLIBCXX_USE_C99_STDINT_TR1)

When looking at the bits/c++config.h, _GLIBCXX_USE_C99_STDINT_TR1 is defined
but _GLIBCXX_HAS_GTHREADS isn't.

I know that GCC has its own implementation of threads called gthreads (that
std::thread relies on) which itself is a wrapper around POSIX threads (or
other flavours depending on configuration).

Either I am not passing the correct flags to GCC (in addition to the
-std=c++0x) or my installation of gcc is not correct, or last possibility,
my GCC build configuration is not correct.

Thanks,

O.


Dave Korn-6 wrote:
> 
> Casull wrote:
> 
>> I've been trying to build GCC 4.4.0 for use with cygwin, and despite the
>> fact that the build succeeds, I can't seem to activate threading even
>> when
>> supplying the --enable-threads=posix configure option. What am I doing
>> wrong
>> in order to activate thread support in gcc for cygwin ?
> 
>   What symptom or behaviour makes you think that threading is /not/
> "activated"?  The --enable-threads=posix option always works fine for me.
> 
>     cheers,
>       DaveK
> 
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