[PATCH] D16084: [ELF][MIPS] Prevent substitution of _gp_disp symbol

[Simon Atanasyan via llvm-commits]

atanasyan created this revision.
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On MIPS O32 ABI, _gp_disp is a magic symbol designates offset between start of function and gp pointer into GOT. In this patch this symbol is defined as a regular absolute symbol to force the linker to always prefer this symbol and does not substitute it by symbols which might be defined in a legacy input shared library.

The `addIgnored` is not enough here because this call adds a weak symbol which might be substituted by symbol from shared library.

Repository:
  rL LLVM

http://reviews.llvm.org/D16084

Files:
  ELF/Driver.cpp
  ELF/Symbols.cpp
  ELF/Symbols.h
  ELF/Writer.cpp
  test/ELF/Inputs/mips-gp-disp-def.so
  test/ELF/mips-gp-disp.s

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