Tomas Hajny schrieb:
If you'd disable the check you would not be able to use e.g. a 2.4 unit
with 2.6, because the PPU format is different and thus you'd definitely
(not just perhaps!) get errors when the compiler reads the PPU file.
In other words: _If_ someone is motivated enough for such a task, it would
be possible to create a convertor from one PPU version to another (and I
don't mean a "convertor" only changing the version number but something
that really loads the original format of the particular original version
and stores the data in the new format with new version). I don't think any
of the core developers would be interested in such a task (at least not
just for fun because it would not be much fun most likely), but I don't
want to talk for others.
Moreover, note that in addition to PPU version number you also have
dependencies related changes in RTL and packages. In other words, you
would need to convert the originally used compiled RTL+packages units this
way together with your own (compiled) units in order to be able to use
those units with the new compiler.
This is where a decompiler could help. It reconstructs the source code
from the old PPU, which then can be adoptede and compiled with a newer
version.
A PPU decompiler is somewhat easy to create, as is for object files of
other OO languages, in contrast to an decompiler for executables of an
unknown (or multiple) compilers. I wrote decompilers for many compilers,
but never for Pascal because I wanted to protect the work of the users
of this language.
DoDi
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