RE: cygheap base mismatch detected

["Dill, Jens (END-CHI)" <jens.dill@endinfosys.com>]

Dave Korn writes:
> On 15 February 2006 22:23, Jens Dill wrote:
> 
> Jens Dill writes:
> > 
> >> ----Original Message----
> >>> From: Andreas Heckel
> >>> Sent: 07 April 2005 11:13
>       ^^^^^^^^^^^^^^^^^
> > Dave:
> > 
> > What you write makes it appear that CygWin simply will not support
> > large executables that reference the CygWin DLL and are also launched
> > from a CygWin shell.
> 
>   No, that was to do with executables that allocate massive amounts of
heap
> space, it's not related to the size of the code section.  And it's got a
lot
> better over the past year.

I can't make this agree with the facts in front of me.

If it has to do with executables that allocate massive amounts
of heap space, then how does the message appear before the 
application even starts, before it has a chance to allocate
anything from the heap?  Massive amounts of statically allocated
memory I can agree with, but not heap space.  I haven't been
tinkering with the --heap option on the link as yet, so it's
not even the declared heap size that is of concern.

Also, the message says that the "heap base" is mismatched.
That doesn't necessarily indicate a connection with heap size.

And if CygWin is going to artificially limit how my program
chooses to allocate memory, it certainly should be documented
better than this.

I agree that the origin of this thread is nearly a year old,
and something may have happened since that time to make it better.
But it's still happening to me, on a newly installed copy
of Cygwin (DLL version 1.5.18), on a machine with ample
memory and processing power, and none of the suggestions
or discussions on this thread or elsewhere since that time
have pointed me to a solution.  The people who say they got 
around it did so in ways that tend to avoid the problem rather 
than elucidate it.

Can I, for instance, create an executable that declares a
sufficiently large amount of static array space, and run it
(directly from Windows, not from a CygWin shell)
as a startup program before any other CygWin process starts,
so that *it* loads the CygWin DLL at a high enough address?
If I do this, do I need to keep it running as long as the
system is up?

                                -- Jens Dill
                                   Endeavor Information Systems



 

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