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Date: Wed, 24 Jun 2009 19:40:39 +0100
From: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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Subject: Re: 1.7 winbase.h (ilockcmpexch) compile error
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Brian Ford wrote:
> I'm trying to build Cygwin 1.7 from CVS to debug an ImageMagick problem on
> server 2008 that causes an access violation in cygwin1.dll.  Doe anyone
> know the work around for this issue?
> 
> g++ (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
> 
> winsup/cygwin/winbase.h: In
> member function `int pthread_mutex::_trylock(pthread*)':
> winsup/cygwin/winbase.h:59:
> warning: volatile register variables don't work as you might wish
> winsup/cygwin/winbase.h:63:
> error: can't find a register in class `AREG' while reloading `asm'
> 
> I presume it is related to this change:
> 
> http://cygwin.com/ml/cygwin-patches/2009-q2/msg00072.html
> 
> but I haven't had time to dig into the full problem.  Thanks for any help
> available.

  Argh.  Try hacking out the 'register' and '__asm ("%eax")' from the
declaration of the 'ret' variable on line 59.  Send me the generated thread.s
file offlist after finishing the build with --save-temps in the CFLAGS and
I'll check that the codegen is correct.

  (Haven't used 3.x to build the DLL in ages myself.)

    cheers,
      DaveK


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