Re: ThreadedX

[Alan Hourihane <alanh at fairlite dot demon dot co dot uk>]

Thanks for this Robert, a much deeper explanation than what was on the
mailing list.

I'll do a build run now, without setting a base address and see how it goes.

If it's all o.k. this way, then that's how we should proceed. If it doesn't
then I'll put the code back.

Alan.

On Thu, Sep 20, 2001 at 06:42:33PM +1000, Robert Collins wrote:
> > -----Original Message-----
> > From: Alan Hourihane [mailto:alanh@fairlite.demon.co.uk]
> > Sent: Thursday, September 20, 2001 6:02 PM
> > To: cygwin-xfree@cygwin.com
> > Subject: Re: ThreadedX
> > 
> > 
> > Mmm, in the thread Chuck asks that 'ld' shouldn't generate 
> > bad load addresses,
> 
> The load address's are fine. The impact on cygwin isn't.
> 
> > and Chris doesn't know the answer, apart from saying it's a 
> > WinXP tradeoff.
> 
> This is one of the big tradeoffs cygwin makes. The heap *must* be at the
> same address consistently, as must cygwin1.dll itself. (It can be
> different across reboots and machines though). 
> 
> > As WinXP ships late October and we've got until early-mid 
> > November before 4.2.0
> > ships. If it shows up problems then, yes, I'll put it back. But it
> 
> Problems will occur now. Randomly - per .exe. Consistently - if exe foo
> fails it will fail consistently.
> 
> > does make the compilation a lot cleaner. Unless the consensus 
> > here is to
> > put it back now. Suhaib - do you agree with the above ?
> > 
> > I tend to agree that 'ld' shouldn't be generating bad code though.
> 
> The thing is, that it's good code. It just *will not* work reliably with
> cygwin.
> 
> The problem occurs on *all* cygwin linked binaries. WinXP only affects
> this insofar as Chris committed a fix for cygwin - which is in 1.3.3 -
> to make it work with XP. The impact affects win95->win2k with cygwin.
> 
> It's up to you, but I know that The early KDE beta Ralf worked on had
> this problem and thats why he couldn't run with Cygwin 1.3.2 until I
> debugged it and let him know.
> 
> My 2c is, just do not set a base address. There is little need to do so.
> If you are going to do so, write a script to prevent colliding with
> cygwin.
> 
> Rob
>  
> > Alan.