When attempting to install my personal library in newer trunk versions of Lararus and Free Pascal I am receiving this message:

(9015) Linking ../lazarus
Cross.Codebot/source/lib/x86_64-linux/codebot.system.o:(.data.n_RTTI_$CODEBOT.SYSTEM_$$_TCONVERT$2+0xe): undefined reference to `RTTI_$CODEBOT.SYSTEM_$$_DEF38' lazarus/ide/lazarus.pp(162,1) Error: (9013) Error while linking /lazarus/ide/lazarus.pp(162,1) Fatal: (10026) There were 1 errors compiling module, stopping
Fatal: (1018) Compilation aborted

The package in question is codebotdsgn.lpk located at https://github.com/sysrpl/Cross.Codebot

Does anyone have any ideas about where to start in fixing this error?

Here are a few defines from codebot.system.pas:

type

  TArray<T> = array of T;

{ TCompare\<T\> is used to compare two items }

  TCompare<T> = function(constref A, B: T): Integer;

{ TConvert\<Source, Target\> is used to convert from one type to another }

  TConvert<TItem, T> = function(constref Item: TItem): T;

{ TConvertString\<T\> is used to convert a type to a string }

  TConvertString<TItem> = function(constref Item: TItem): string;

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Find the FPC revision that broke it.

Mattias

"Anthony Walter" wrote

Does anyone have any ideas about where to start in fixing this error?

Does this also occur with 3.0.1 or the 3.0.0RC1? Does it occur with the latest trunk version of FPC?

If any of the above then please report a bug with a small, self contained example that shows the problem.

Regards,
Sven
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It was working in the trunk FPC versions in March of this year, which I believe where labeled 3.1.1. I'll try rolling back FPC revisions until I can find in which one broke it.
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Okay, I found the problem. If you have a generic type defined in a package which goes unused, attempts to reuse that package will fail.

Submitted here:

http://bugs.freepascal.org/view.php?id=28766
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