Oracle re-review on PR #26 flagged that the Swift-side
`_ = unsafeBitCast(fn as @convention(c) ...)` static references in
ChanoraSileroSelfTest.run() are not a robust anti-dead-strip guarantee
under WMO + LTO. The optimizer can prove the discarded result has no
side effects and eliminate the address-taken reference.
The load-bearing fix is a second linker flag per symbol:
-u _sym forces the symbol as undefined at link time,
preventing the object that defines it from
being dropped and stopping -dead_strip from
removing the definition.
-exported_symbol _sym was already present; re-exports the symbol
in the binary's dynamic symbol table so the
Rust framework's dlsym(RTLD_DEFAULT) can find
it. This flag alone does NOT prevent dead-
strip; it only controls the export list
applied AFTER dead-strip.
Both flags now appear per symbol on both iOS and macOS Release
xcconfigs. The Swift-side static references stay as defense-in-depth
but are no longer the load-bearing guarantee.
Edison Jwa
1bc2fccd0a