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Date: Tue, 02 Sep 2008 17:41:50 -0700
From: Brian Dessent <brian AT dessent DOT net>
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Subject: Re: why the strange stack stuf in cygwin?
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[ Your messages would be a lot easier to read without the random
schizophrenic line length and indentation. ]

Jay wrote:

>   I meant implementing __thread in gcc.

Starting in 4.3 gcc supports emutls, which enables __thread support on
all threaded targets, even when there is no actual TLS support.  It does
this by mapping accesses to the gthread API in libgcc, i.e.
__gthread_{get,set}specific.  This is a generic API that maps onto one
of several platform specific thread APIs.  In the case of Cygwin this is
pthreads, i.e. Cygwin defaults to --enable-threads=posix.  This means
the accesses will go through pthread_{get,set}specific().

Obviously this is not usable from inside Cygwin, but otherwise it should
work fine.

>   they are of release quality (last I checked), and they aren't upstream I think.

That's not true.  The x86_64 MinGW target is fully functional in FSF gcc
and binutils.  I don't know if it can bootstrap itself yet or is still
limited to crosses, but it's at the point where the output is usable at
least.

Brian

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