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Date:	Wed, 24 Jun 2009 15:37:22 -0400
From:	Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
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Subject:	Re: 1.7 winbase.h (ilockcmpexch) compile error
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On Wed, Jun 24, 2009 at 07:40:39PM +0100, Dave Korn wrote:
>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.)

Me neither.

I'm comfortable making gcc 4.x a requirement for building Cygwin and its
utilities.

Apparently Corinna is using 4.x since this change predates at least two
previous 1.7.0 releases.

cgf

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