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

[Alex Wang via llvm-dev]

Whoops. Forgot to include what happened before the patch.

Without it, my build fails earlier with something along the lines of "Building for
iOS simulator, but linking against file (libc++.dylib) built for OS X (x86_64)".
The linker wasn't touching the iPhone SDK at all, instead going straight for
/usr/lib/libc++.dylib. This also happened with libSystem.dylib, but I don't know
what causes one library to fail vs the other.

> On Sep 22, 2015, at 4:57 PM, Chris Bieneman <beanz at apple.com> wrote:
> 
> In the failing command (iossim-log) the syslibroot flag is being specified to the linker and the link command still fails, so your patch shouldn’t fix the problem. You can see that listed in iossim-link.txt.
> 
> The other error is (if anything) more disturbing. You’re generating a malformed libLLVMSupport. Not sure how that’s happening.
> 
> It looks to me like there is something wrong with your host toolchain. I don’t really know what else to say, but your patch shouldn’t have any impact on this problem since that flag is already being specified in the failing commands you’ve shown.
> 
> -Chris
> 
>> On Sep 22, 2015, at 1:43 PM, Alex Wang via llvm-commits <llvm-commits at lists.llvm.org <mailto:llvm-commits at lists.llvm.org>> wrote:
>> 
>> 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 <mailto: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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