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

Tue Sep 22 14:42:43 PDT 2015

The behavior here is consistent with setting SDKROOT in the environment to an OS X SDK.

-Chris

> On Sep 22, 2015, at 2:28 PM, Alex Wang <aw1621107 at gmail.com> wrote:
> 
> Logs + commands added to the earlier gist.
> 
> Only thing different from a plain trunk build is adding -Wl,-v and -Wl,-t to the
> iossim link flags.
> 
>> On Sep 22, 2015, at 5:17 PM, Chris Bieneman <beanz at apple.com <mailto:beanz at apple.com>> wrote:
>> 
>> Can you please provide the full error and information about the failure you saw without your patch?
>> 
>> Since you couldn’t build before the patch, and you can’t build with the patch. I suspect there is an underlying issue which isn’t being addressed.
>> 
>> -Chris
>> 
>>> On Sep 22, 2015, at 2:02 PM, Alex Wang <aw1621107 at gmail.com <mailto:aw1621107 at gmail.com>> wrote:
>>> 
>>> 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 <mailto: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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>>>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev <http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
>>>>> 
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>>>> 
>>> 
>> 
> 

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