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From "Steve Huston" <shus...@riverace.com>
Subject RE: Status of Qpid port to Windows
Date Fri, 30 May 2008 00:53:06 GMT
Hi Alan,

> >> dll import/export specs and get some real testing underway 
> on Windows.
> > 
> > The issue of exported/non-exported symbols is also relevant 
> to the gcc
> > tool chain as well and gcc supports a notation to control 
> how symbols
> > are exported from shared object as well. See
> > http://gcc.gnu.org/wiki/Visibility for the recommended way 
> to do this.
> > Incidentally doing this is supposed to speed up link times 
> appreciably.
> > 
> > [FYI The gcc syntax is: __attribute__ ((visibility("default")))
> > export and __attribute__ ((visibility("hidden"))) for 
> unexported. There
> > is no notation for importing into a shared object]
> > 
> Now THAT is interesting! Steve, I would be interested in a 
> patch with just the 
> import/export macros so I can give the gcc visibility 
> attributes a whirl. It 
> looks like that might provide significant build & run time 
> performance benefits 
> to the gcc build which in turn would benefit the windows 
> build by making gcc developers care about declspecs.
> Not to interrupt your existing plan - if it's convenient for 
> you to get the 
> declespec work in earlier then that's an interesting option, 
> if not I'll wait till you're ready with the larger port.

Separating out just the declspecs would be a tedious job... But I just
created QPID-1105 in jira, and the patches for declspecs are part of


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