[PATCH] D21930: [ELF] - Implement extern "c++" version script tag

[George Rimar via llvm-commits]

grimar created this revision.
grimar added reviewers: ruiu, rafael.
grimar added subscribers: llvm-commits, grimar.

Patch implements 'extern' version script tag.
Currently only values in quotes(") are supported.

According to Ian Lance Taylor article (http://www.airs.com/blog/archives/300),
matching of extern is performed as a second pass after exact match of globals.
Patch implements the same logic, also it is heavily relies on D21894 changes.

http://reviews.llvm.org/D21930

Files:
  ELF/Config.h
  ELF/SymbolListFile.cpp
  ELF/SymbolTable.cpp
  test/ELF/version-script-err.s
  test/ELF/version-script-extern.s

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