[PATCH] D17998: [ELF] implement --warn-common/--no-warn-common

[George Rimar via llvm-commits]

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

-warn-common
              Warn when a common symbol is combined with another common symbol
              or with a symbol definition.  Unix linkers allow  this  somewhat
              sloppy  practice, but linkers on some other operating systems do
              not.  This option allows you to  find  potential  problems  from
              combining global symbols.

This should fix the the https://llvm.org/bugs/show_bug.cgi?id=26737

http://reviews.llvm.org/D17998

Files:
  ELF/Config.h
  ELF/Driver.cpp
  ELF/Options.td
  ELF/Symbols.cpp
  test/ELF/Inputs/warn-common.s
  test/ELF/Inputs/warn-common2.s
  test/ELF/warn-common.s

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