>> Checking changes is hard. Compiling it is the only to make sure that you
>> running the latest saved source.
>
> Why not store the checksum of each source file of a project when compiling
> and do a check before compilation to determine whether or not to compile
> again. (Should need a similar check for the compiled unit to be safe).
> Data should be stored in the project file.
The only reliable way is to implement exactly the same rules as the
compiler. Otherwise there will be a difference between what lazarus thinks
and what the compiler thinks. Result will be a lot of bug reports about
different behaviour of both products.
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