[PATCH] D14970: ELF: Omit PT_GNU_STACK segment if -z execstack is provided.

[Rui Ueyama via llvm-commits]

ruiu created this revision.
ruiu added a reviewer: joerg.
ruiu added a subscriber: llvm-commits.

In the previous patch (r254003), I made the linker emit PT_GNU_STACK
unconditionally. But sometimes you want to have a control over the
presence of the segment. With this patch, you can omit the segment
by passing -z execstack option.

http://reviews.llvm.org/D14970

Files:
  ELF/Writer.cpp
  test/ELF/gnustack.s

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