[PATCH] D33975: [MachO] Fix codegen of alias of alias.

[Evgenii Stepanov via llvm-commits]

On Wed, Jun 7, 2017 at 3:39 PM, Rafael Avila de Espindola
<rafael.espindola at gmail.com> wrote:
> Evgenii Stepanov via Phabricator <reviews at reviews.llvm.org> writes:
>
>> Index: test/MC/MachO/alias.s
>> ===================================================================
>> --- /dev/null
>> +++ test/MC/MachO/alias.s
>> @@ -0,0 +1,12 @@
>> +// RUN: llvm-mc -triple x86_64-apple-macosx10.12.0 %s -filetype=obj | llvm-readobj -r | FileCheck %s
>> +
>> +l_a:
>> +l_b = l_a
>> +l_c = l_b
>> +        .long l_c
>> +
>> +// CHECK:      Relocations [
>> +// CHECK-NEXT:   Section __text {
>> +// CHECK-NEXT:     0x0 0 2 1 X86_64_RELOC_UNSIGNED 0 l_c
>> +// CHECK-NEXT:   }
>> +// CHECK-NEXT: ]
>
> Wasn't the expectation that the relocation was with l_a?

Well, they are the same.
This code is used to evaluate the value of the fixup in the current
layout, which is later ignored, AFAIU, because the fixup is not fully
resolved, and we end up recording the original fixup expression, i.e.
l_c.