[PATCH] D17007: Use the plt entry as the address of some symbols

[Rafael Ávila de Espíndola via llvm-commits]

rafael created this revision.
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This is the function equivalent of a copy relocation.

Since functions are expected to change sizes, we cannot use copy relocations. In situations where one would be needed, what is done instead is:
* Create a plt entry
* Output an undefined symbol whose addr is the plt entry.

The dynamic linker makes sure any shared library uses the plt entry as the function address.


Repository:
  rL LLVM

http://reviews.llvm.org/D17007

Files:
  ELF/OutputSections.cpp
  ELF/Symbols.cpp
  ELF/Symbols.h
  ELF/Target.cpp
  ELF/Target.h
  ELF/Writer.cpp
  test/ELF/Inputs/undef-with-plt-addr.s
  test/ELF/symbol-override.s
  test/ELF/undef-with-plt-addr.s

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