[PATCH] D19430: ELF: Implement basic support for --version-script.

[Peter Collingbourne via llvm-commits]

pcc created this revision.
pcc added reviewers: rafael, ruiu, davide, grimar.
pcc added a subscriber: llvm-commits.
Herald added a subscriber: joker.eph.

This patch only implements support for version scripts of the form:
  { [ global: symbol1; symbol2; [...]; symbolN; ] local: *; };
No wildcards are supported, other than for the local entry. Symbol versioning
is also not supported.

It works by introducing a new Symbol flag which tracks whether a symbol
appears in the global section of a version script.

This patch also simplifies the logic in SymbolBody::isPreemptible(), and
teaches it to handle the case where symbols with default visibility in DSOs
do not appear in the dynamic symbol table because of a version script.

Fixes PR27482.

http://reviews.llvm.org/D19430

Files:
  ELF/CMakeLists.txt
  ELF/Config.h
  ELF/Driver.cpp
  ELF/Driver.h
  ELF/DynamicList.cpp
  ELF/DynamicList.h
  ELF/Options.td
  ELF/SymbolListFile.cpp
  ELF/SymbolListFile.h
  ELF/SymbolTable.cpp
  ELF/SymbolTable.h
  ELF/Symbols.cpp
  ELF/Symbols.h
  test/ELF/lto/internalize-version-script.ll
  test/ELF/no-inhibit-exec.s
  test/ELF/version-script.s

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