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

[Alex Wang via llvm-dev]

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
> On Sep 22, 2015, at 4:04 PM, Chris Bieneman <beanz at apple.com> wrote:
> 
> This does not sound right. -isysroot specified during linking should be passing through the sys root to the linker.
> 
> What is the error you’re seeing? It would also help if you can provide the clang++ invocation and the output of it when run with -v.
> 
> Also which version of OS X are you on and which version of Xcode are you using?
> 
> Thanks,
> -Chris
> 
>> On Sep 22, 2015, at 12:34 PM, Alexey Samsonov <vonosmas at gmail.com <mailto:vonosmas at gmail.com>> wrote:
>> 
>> +llvm-commits (correct list)
>> 
>> On Tue, Sep 22, 2015 at 12:32 PM, Alexey Samsonov <vonosmas at gmail.com <mailto:vonosmas at gmail.com>> wrote:
>> Could you describe the build failures you see after applying this patch? I'll let Chris judge if adding -Wl,-syslibroot makes sense for iossim, or that problem should be solved differently.
>> 
>> On Tue, Sep 22, 2015 at 9:37 AM, Alex Wang via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> Hello all!
>> 
>> Just got a small patch I’d like to put up for review.
>> 
>> llvm with clang and compiler-rt have been consistently failing for me during
>> the linking step for either the address or ub sanitizer for iOS simulator.
>> 
>> As far as I could tell, passing -isysroot to clang++ when linking does not
>> also set the search root for ld. This patch addresses that issue.
>> 
>> Unfortunately, the build fails later on, so I can't say for sure whether
>> this won't break anything else, or if it is required elsewhere. I'm also
>> not sure if this is specific to my computer, but it persisted between a
>> wipe + reinstall, so I'm hoping it isn't just me getting this.
>> 
>> Thanks,
>> Alex
>> 
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev <http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
>> 
>> 
>> 
>> 
>> -- 
>> Alexey Samsonov
>> vonosmas at gmail.com <mailto:vonosmas at gmail.com>
>> 
>> 
>> -- 
>> Alexey Samsonov
>> vonosmas at gmail.com <mailto:vonosmas at gmail.com>

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