Re: [Gnu-arch-users] Arch On Cygwin(Win32)

[John Kinson]

Robert Collins wrote:
> What did you change them to? Did you find that methods on objects where
> getting called with invalid 'this' pointers? And that the problem only
> occured on stack based objects with a footprint > ~ 4K ?
>
> If so, check the assembly, I strongly suspect it's a g++ issue, and have
> a second hand report (good quality 2nd hand, but as there is no formal
> test case..) that it is, and has been fixed in g++ 3.3.x. We should be
> able to get a fix into cygwin gcc relatively easily, once we have a test
> case.

Thanks for the hint, will look into it.

> Actually, cygwin doesn't come close to the posix minumum. The MAX_PATH
> define from the win32 headers applies to the paths used by cygwin. So
> when you mount (for instance) c:\documents and settings\John as
> /home/john/, you've lost ~20 characters silently. Add in server based
> resources (mounted via \\ ... \ ....  and it gets worse.

Not much we can do about that then.

> > I just hacked 
> > successfully safe_mkdir to call CreateDirectoryW as a proof of concept, 
> > and this would seem *much* easier than the Cygwin patch...  Any 
> > drawbacks to this approach?
>
>
> It's ugly. It won't work. That should be enough.

With regard to the specific failure of creating long directories, 
actually it does work (very neatly).  However...

> Ugly I covered in my other email. As for working: you need to address
> all the external tools:
> ~/.arch-params/hook
> tar
> gzip
> bash
>
> as a minimum.

Point taken.

> Tell me that porting all of them to use win32 IO calls is easier than
> fixing it in one place?

I can't answer that yet, but I'm willing to pursue it a little before 
ruling it out.  I don't yet know whether *all* IO calls must be 
translated into W32 WCS native ones.

If, however, Cygwin is extended to support long paths, then are you in a 
position to roll the changes into an official Cygwin distribution? 
Would Cygwin be willing to accept such a change (with all the testing 
and support issues that come with it)?

If not, then arch will still face the significant obstacle of requiring 
a specially patched version of Cygwin in order to run.

JK
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