[llvm] r258627 - [Bitcode] Insert the darwin wrapper at the beginning of a file when the

[Mehdi Amini via llvm-commits]

> On Jan 26, 2016, at 9:22 AM, Pete Cooper via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> 
> 
> Sent from my iPhone
> 
>> On Jan 26, 2016, at 9:18 AM, Rafael Espíndola via llvm-commits <llvm-commits at lists.llvm.org> wrote:
>> 
>>> On 26 January 2016 at 09:10, Akira Hatanaka <ahatanaka at apple.com> wrote:
>>> 
>>>> On Jan 26, 2016, at 9:06 AM, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
>>>> 
>>>> On 23 January 2016 at 08:02, Akira Hatanaka via llvm-commits
>>>> <llvm-commits at lists.llvm.org> wrote:
>>>>> Author: ahatanak
>>>>> Date: Sat Jan 23 10:02:10 2016
>>>>> New Revision: 258627
>>>>> 
>>>>> URL: http://llvm.org/viewvc/llvm-project?rev=258627&view=rev
>>>>> Log:
>>>>> [Bitcode] Insert the darwin wrapper at the beginning of a file when the
>>>>> target is macho.
>>>>> 
>>>>> It looks like the check for macho was accidentally dropped in r132959.
>>>>> 
>>>>> I don't have a test case, but I'll add one if anyone knows how this can
>>>>> be tested.
>>>> 
>>>> 
>>>> llvm-as should do it, no?
>>>> 
>>>> In a .ll with just
>>>> 
>>>> target triple = "x86_64-apple-macosx"
>>>> 
>>>> I get a .bc that starts with "de c0 17 0b" (bitcode in LE) and with
>>>> 
>>>> target triple = "x86_64-pc-linux"
>>>> 
>>>> I get a .bc that starts with "42 43 c0 de" (BC code).
>>> 
>>> Can I use hexdump to print the header? Or are there other llvm tools to do that?
>> 
>> It might be an issue on windows. I am not sure. You might be able to
>> use python or "head -c" to get the first bytes.
> I think it would also be fine to teach the llvm-bcanalyzer to emit this, even if it's behind a flag to do so.

Oh I missed this email before sending mine, same idea :)

— 
Mehdi