[PATCH] D57385: [ELF] Support --{,no-}allow-shlib-undefined

[Joerg Sonnenberger via Phabricator via llvm-commits]

joerg added a comment.

Neither GNU ld nor gold implement really useful behavior here. Ideally, every library would be linked with -z defs, but that normally doesn't work because on many systems certain symbols are imported from the main program by default. A good example are the entry points of the dynamic linker. A bad example historically speaking is libwrap. From a user perspective it would be desirable to have a way to say "This symbol will be supplied by someone else" when linking a shared library or potentially even the main binary. That would allow whitelisting intentionally undefined symbols and allow avoiding any symbol resolution dance for shared libraries. A single pass over the symbol tables is still necessary for the sake of knowing the defined symbols and for potential copy relocations, but no further work should be needed.


Repository:
  rLLD LLVM Linker

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  https://reviews.llvm.org/D57385/new/

https://reviews.llvm.org/D57385