llvm dev - Sep 2015 - [compiler-rt] Add iOS simulator link flag

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

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
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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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> 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
>> _______________________________________________
>> 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
> 
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
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