TOPIC:

Does LPI file contain any required info or is it just temporary file created azarus for its internal needs like *.ppu?

The question is - i am, working on 3rd-party library and usually i have demo project open like my testbed.

May main concern is Delphi XE2, while original author insists on Lazarus and D7 support.
While i can not and do not want to have D7, i installed CT 3.10 and check FPC compatibility periodically.

But... when i commit some change in the lib - demo project is also changed. Sometimes it is needed change as when i changed library interface.

But sometimes i seemingly did not changed anything in demo except for running demo project on one or another computer.

Still Git wants to pull LPI file with a Library commit and that to me looks like garbage. Or maybe not ?

Or perhaps i can just ban *.lpi from Git liek i banned *.dcu and *.ppu ?

Why don't you open it with any text editor and see for yourself?
One look costs 1000 words

because it doesn't tell me if this file is temporary cache or important data.

for example open .map file in Notepad - and what ? you can see WHAT is there but not WHY it is where.
Looking into the content without understanding dependencies in the FPC process flow - which is external knowledge i lack about LPI - would not tell you if it is safe to loose/delete the file or just left it non-updated.

You didn't look, did you?
Ok. I'll stir you:Does this tell you anything? What does it look like? "Like a path to some libraries" should be your answer.Does this tell you anything? What does it look like? "Like an output folder parameter" should be your answer.Does this tell you anything? What does it look like? "Like a compiler options" should be your answer.

So even with this few examples it should be obvious, that "The main file of a Lazarus project is the .lpi file (Lazarus Project Information)." (from wiki: wiki.freepascal.org/Lazarus_For_Delphi_Users).

Wiki link is good. Thank you.

All the rest is not related. If some setting is contained in some cache - that does not mean cache is primary source.
I saw those settings inside, what i asked was exactly if this is the primary source or a cache that can and should be recreated as hoc.

The rest IS related, 'cause that should have stirred you to look further and eventualy find an answer w/o wiki

Anyway, I'm glad you're satisfied with wiki link. So, YW!