A raw MMU_* define alongside a PIO_FRAMEWORK_ARDUINO_MMU_* knob, or a
raw TCP_MSS/LWIP_* alongside the lwIP knobs, would win the compile line
while the linker script or prebuilt library keeps the knob's values;
both now raise like the no-knob case. _MMU_VARIANTS holds tuples and the
resolved config gets a copy, so nothing aliases the module table.
_lexed_build_flags lexes once and both consumers accept the tokens, so
a malformed entry warns once per build. The linker-script stamp covers
the header's size and mtime, an unreadable or non-UTF-8 cache
regenerates instead of aborting, plain-form linker flags warn that they
are not routed to the link line, and a moved rate-table anchor surfaces
as a named build error.
J. Nick Koston
7c2254d8ee