[llvm] r315044 - Roll forward r314928

[Reid Kleckner via llvm-commits]

On Fri, Oct 6, 2017 at 2:50 PM, Xinliang David Li <davidxl at google.com>
wrote:

> On Fri, Oct 6, 2017 at 2:20 PM, Reid Kleckner <rnk at google.com> wrote:
>
>> This appears to have caused a bootstrap failure on Windows:
>> http://lab.llvm.org:8011/builders/clang-x64-ninja-win7/builds/6884
>> http://lab.llvm.org:8011/builders/clang-x86-windows-msvc2015/builds/7611
>>
>> I am going to revert and try to reproduce. It looks like clang ends up
>> emitting an error on valid code.
>>
>
> Please help with the reproducible -- it will be hard for me to get a repro
> on windows.
>

Can you build clang with your patch and try to compile this code?

char *f(char *p, int i) {
  return p + i;
}

If clang says:
t.c:2:12: error: invalid operands to binary expression ('char *' and 'int')
  return p + i;
         ~ ^ ~
1 error generated.

Then you have the miscompile locally and it doesn't require Windows.
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