[llvm-dev] [compiler-rt] Add iOS simulator link flag

[Alex Wang via llvm-commits]

Summary is linker fails with unknown symbol in iossim asan/ubsan (was _wordexp
in the past, now is _sigaltstack$UNIX2003"i), or ranlib getting bad input while
working on native tablegen (archive extends past end of file, no such file are
the ones I remember)

Full commands + partial logs here:
    https://gist.github.com/aw1621107/86fec1e1fa9cc66bbf4d <https://gist.github.com/aw1621107/86fec1e1fa9cc66bbf4d>

This was built on OS X 10.11, Xcode 7.1 using the following homebrew command
and formula:

  brew install llvm --with-clang --with-sanitizers --HEAD --debug --verbose
  https://github.com/aw1621107/homebrew/blob/llvm-updates/Library/Formula/llvm.rb <https://github.com/aw1621107/homebrew/blob/llvm-updates/Library/Formula/llvm.rb>
> On Sep 22, 2015, at 4:08 PM, Joerg Sonnenberger via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> On Tue, Sep 22, 2015 at 01:04:27PM -0700, Chris Bieneman via llvm-dev wrote:
>> This does not sound right. -isysroot specified during linking should be passing through the sys root to the linker.
> 
> No? It should just be dropped.
> 
> Joerg
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