plugins: fix compilation if FLB_SQLDB (sqlite3) is disabled

[ThomasDevoogdt]

Fixes:

• Building without FLB_SQLDB (sqlite3) support completely broken. #9757.

[patrick-stephens]

Let's make sure this compiles for all existing targets as well.

Would it be better to disable the features within the plugins that need the DB rather than the whole plugin @leonardo-albertovich ? It feels a bit like a large hammer, e.g. no tail input even if you don't use db. We would have to make the config options and any other usage conditional though so it may be worse.

[ThomasDevoogdt]

Let's make sure this compiles for all existing targets as well.

How can it not? Currently, FLB_SQLDB is enabled by default, and will stay like that. The problem is the other way around, if not enabled, then compilation breaks.

Would it be better to disable the features within the plugins that need the DB rather than the whole plugin @leonardo-albertovich ? It feels a bit like a large hammer, e.g. no tail input even if you don't use db. We would have to make the config options and any other usage conditional though so it may be worse.

For me fine, but I would do that on a per feature basis. Perhaps just continue with this PR, and then fine-tune some features that might compile with some small fixups.

In general, it would be much better if all options are toggled in the automated tests, on one reference compilation system. Perhaps even by incremental builds. But either way, I just want to fix compilation now.

[ThomasDevoogdt]

@patrick-stephens @edsiper I changed this PR so that plugins are still compiled, but without database support. I hope this answers #10239 (comment).

Tested by doing this:

cd build/
cmake -GNinja -DFLB_SQLDB=OFF ../
ninja

and

cd build/
cmake -GNinja -DFLB_PREFER_SYSTEM_LIBS=ON -DFLB_SQLDB=OFF ../
ninja

[patrick-stephens]

Not sure if the CI failure is relevant or something else

[ThomasDevoogdt]

Not sure if the CI failure is relevant or something else

I just added #ifdef FLB_HAVE_SQLDB, which is true by default, so I don't think it's relevant.