[0/6] symbols: assorted adjustments

Message

Jan Beulich March 13, 2025, 1:50 p.m. UTC

The main goal was what patch 5 does, but on the way there various other
things became noticeable, and some preparation was necessary, too.

1: add minimal self-test
2: don't over-align generated data
3: sanitize a few variable's types
4: split symbols_num_syms
5: arrange to know where functions end
6: centralize and re-arrange $(all_symbols) calculation

Jan