[PATCH] D130429: [lld-macho] `-exported_symbols` should hide symbols before LTO runs

[Jez Ng via Phabricator via llvm-commits]

int3 created this revision.
int3 added a reviewer: lld-macho.
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We were previously doing it after LTO, which did have the desired effect
of having the un-exported symbols marked as private extern in the final
output binary, but doing it before LTO creates more optimization
opportunities.

One observable difference is that LTO can now elide un-exported symbols
entirely, so they may not even be present as private externs in the
output.

This is also what ld64 implements.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130429

Files:
  lld/MachO/Driver.cpp
  lld/test/MachO/lto-exported-symbol.ll

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