The original motivation for making LFS3_PREERASE opt-out, is that it
makes sense for LFS3_GBMAP to bring in all gbmap-related features
(PREERASE, BADBLOCKS (future)). However, after a bit of use, I think
this just complicates our ifdef logic too much.
So instead, LFS3_PREERASE is now opt-in, with the intention of making
all ifdefs relative only to the default build. I think this will make it
easier to reason about ifdefs, at least internally.
Eventually, I want to look into alternative default builds (LFS3_BIGGER,
LFS3_BIGGERR, ..., LFS3_BIGGEST), which would provide an alternative way
to enable all gbmap-related features. Though these builds have a
high-risk of bikeshedding (LFS3_GC?), so we'll see.
---
That being said, the main ergonomic improvement was probably adding
a #error, so we don't have to check ifdef GBMAP everywhere.
Maybe this should be extended to LFS3_RDONLY? Or maybe not, LFS3_RDONLY
is a bit of a special case.
No code changes:
code stack ctx
before: 35144 2136 660
after: 35144 (+0.0%) 2136 (+0.0%) 660 (+0.0%)
code stack ctx
gbmap before: 38380 2144 776
gbmap after: 38380 (+0.0%) 2144 (+0.0%) 776 (+0.0%)
code stack ctx
preerase before: 38920 2168 796
preerase after: 38920 (+0.0%) 2168 (+0.0%) 796 (+0.0%)
Christopher Haster
ecd780a313