[delphizip] Re: Link Error 1496 after upgrading to ZipMaster 1.79
- From: James Turner <james.d.h.turner@xxxxxxxxxxxx>
- To: delphizip@xxxxxxxxxxxxx
- Date: Sat, 07 Feb 2009 02:18:02 +0000
This sounds like a unit dependency error (or conflict). I had one a few
months ago - it's still not fully resolved. Changes to the interface
part of some units in a large project still throw an internal error on
first compilation but a second compilation is ok (build works too).
Other than circular unit references, there is an old bug that goes all
the way back to Turbo Pascal 5 (more than 20 years ago) that means the
compiler can get confused when a change is made to the interface part of
a unit - bad code can be generated leading to access violations. After
changing the interface part of any unit, a full build is the only safe
way to proceed. I have never managed to pin down the exact cause of the
problem but renaming variables is a common trigger.
Typically, to fix this type of problem, some variables, types and/or
constants will need to be moved from the interface of one unit into a
new unit thereby eliminating a cross-unit dependency (provided
unnecessary uses are also removed). A similar approach is required to
solve unit initialization conflicts but that's another problem altogether.
I used a dependency analyser by modelmakertools.com to locate my problem
but I can't find a download link right now.
-- James Turner
Jay Eisenstock wrote:
> I've been using ZipMaster 1.78 for a number of years without any issues. I
> just upgraded to 1.79.10.07, I'm using Delphi 5 Enterprise addition. I can
> get past the link error if I build every time before running but that is not
> right.
> Also, I have had trouble getting SortGrid to work with this version. When I
> try to install it gives me an error "SortGrid.pas recursively uses itself"
>
> Any help would be most appreciated
>
> Jay Eisenstock
> jeisenstock@xxxxxxxxxxx
>
>
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