[LLVMdev] Code generation support in llvm for windows phone

[Saleem Abdulrasool]

On May 28, 2014, at 5:18 AM, Rajat Mahajan <rmahajan at adobe.com> wrote:

> I am talking about Windows Mobile 8 and 8.1 and not CE.
> Not sure though that the Windows 8 (ARM NT) is similar to Windows Mobile 8 platform.
> 
> I used the following command to generate the obj file
>    Llc.exe -mtriple=thumbv7-windows  -filetype=obj  <some_name>.bc
> 
> The object file generated in the above object doesn't get linked when I try to link it with the windows mobile library as it fails to recognize the object format.  ( Not a valid object file )
> 
> Hope I am clear.

Unfortunately, you have merely repeated your previous statement.  I don’t have enough here to diagnose nor even speculate what is going on.

If you can provide the object file, it would be helpful as I am unable to reproduce this issue.  Although, I ran it via clang, I see no reason that the output would be different as the backend is the same.

The triple is certainly correct (particularly for llc, clang will treat armv7-windows as thumbv7-windows).  How did you generate the bit code?  My testing has usually started from C or LLVM IR rather than bit code, but, I suspect that shouldn’t be a real issue.

With the given information, the only thing that comes to mind is that your environment is setup improperly, resulting in the wrong link.exe being invoked.

> ~rajat
> 
> -----Original Message-----
> From: Saleem Abdulrasool [mailto:abdulras at fb.com] 
> Sent: Friday, May 16, 2014 11:23 PM
> To: Rajat Mahajan
> Cc: llvmdev at cs.uiuc.edu
> Subject: Re: [LLVMdev] Code generation support in llvm for windows phone
> 
> 
> On May 16, 2014, at 6:53 AM, Rajat Mahajan <rmahajan at adobe.com> wrote:
> 
>> Hi,
>> 
>> Is there support available in llc to convert llvm bytecode to Windows Mobile binary? 
>> I have tried triples like arm-pc-win32 , thumbv7-window ... but the object file generated is not getting linked to the windows native project. 
>> Any pointers will be greatly appreciated?
> 
> As Reid mentioned, I have been working on this recently.  Just to make sure that we are talking about the same environment, I assume that you are talking about Windows 8 (ARM NT) rather than the Windows CE based environment.
> 
> Can you please explain what exactly you mean by "the object file generated is not getting linked to the windows native project".  The object file that we generate should be pretty compatible with MSVC.  If you have specific cases where we are generating something that is incompatible, I would be quite interested in hearing about that.
> 
>> Thanks,
>> ~rajat
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> -- 
> Saleem Abdulrasool
> abdulras (at) fb (dot) com
> 
> 
> 
> 
> 

-- 
Saleem Abdulrasool
abdulras (at) fb (dot) com