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There are few things more fun than topping off a righteously sweaty code refactoring session with a particularly rare and un-to-underdocumented linker error.
I ran into this in CodeGear RAD Studio 2007 on the Delphi for .NET side. It was different than the small handful of problems I saw other people run into, and since I managed to track it down to a particular line, I thought I would share it.
My encounter with this linker error happened when using a named constant set, e.g.
FIELD_BLOB_TYPES : set of MyFieldType = [mftBinary, mftGraphic, mftDiagram, mftAttachments]
The code that caused the explosion simply used the type:
if Attribute.ValueType in FIELD_BLOB_TYPES then
Replacing it with the full set fixed the issue:
if Attribute.ValueType in [mftBinary, mftGraphic, mftDiagram, mftAttachments] then
Note that using this code construct is no guarantee that this linker issue will happen - I actually use this construct in other parts of my code with no problem - but if you do run into this weird linker error, this may be the straw that is breaking the camel's back.
Hopefully, I can save someone out there from the frustration.
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