[LLVMdev] Support for Windows Phone 8.1

Saleem Abdulrasool abdulras at fb.com
Mon Jun 9 08:15:56 PDT 2014 

On Jun 8, 2014, at 10:46 PM, Damanjit Singh <dsingh at adobe.com> wrote:

> Thanks a lot Saleem,
> 
> The issue is fixed and a simple app works fine now.

Awesome; thanks for the verification.

> -Daman
> 
> On 08/06/14 12:57 pm, "Nick Lewycky" <nicholas at mxc.ca> wrote:
> 
>> Damanjit Singh wrote:
>>> Thanks Saleem, Nick.
>>> 
>>> I will try with the latest code and share the results.
>>> 
>>> Though, just curious if I need to really use clang to generate the
>>> object file and the current steps won't work? I ask because using .c
>>> file was only an illustration. For my project the IR is not generated
>>> from .c files or clang.
>> 
>> You don't need to use clang. When you use clang you have to tell it what
>> target it's targeting.
>> 
>> If you're starting with IR, try "llc -filetype=obj foo.bc -o foo.obj
>> -mtriple=..." to produce a .o file directly. I'm not experienced with it
>> myself but I've heard that MSVC will produce assembly that it can't
>> parse, so it's probably a good idea to leave assembly out of the
>> equation when targeting Windows.
>> 
>> Nick
>> 
>>> On 08-Jun-2014, at 11:00 am, "Saleem Abdulrasool" <compnerd at compnerd.org
>>> <mailto:compnerd at compnerd.org>> wrote:
>>> 
>>>> On Sat, Jun 7, 2014 at 4:49 PM, Nick Lewycky <nicholas at mxc.ca
>>>> <mailto:nicholas at mxc.ca>> wrote:
>>>> 
>>>>    Damanjit Singh wrote:
>>>> 
>>>>        Hi guys,
>>>> 
>>>>        Would really appreciate any help here.
>>>> 
>>>>        Thanks,
>>>>        Daman
>>>> 
>>>>        From: Damanjit Singh <dsingh at adobe.com
>>>>        <mailto:dsingh at adobe.com> <mailto:dsingh at adobe.com>>>         <mailto:dsingh at adobe.com>>>
>>>> 
>>>>        Date: Friday, 6 June 2014 12:57 pm
>>>>        To: "llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu>
>>>>        <mailto:llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at cs.uiuc.edu>>"
>>>>        <llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu>
>>>>        <mailto:llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at cs.uiuc.edu>>>
>>>> 
>>>>        Subject: Support for Windows Phone 8.1
>>>> 
>>>>        Hi LLVMdev,
>>>> 
>>>>        Does the latest trunk code support Windows Phone 8.1 target ?
>>>> 
>>>> 
>>>>    I don't know this, but ...
>>>> 
>>>>        I was trying out a simple program, but Visual Studio 2013¹s
>>>> linker
>>>>        failed for me with this error - app.obj : error LNK2008: Fixup
>>>>        target is
>>>>        not aligned Œadd3'
>>>> 
>>>>        This is what I tried -
>>>> 
>>>>        * Download latest LLVM sources (as on 4th June) and build them
>>>>        on my
>>>>        MAC 10.9 machine.
>>>>        * Wrote a simple a.c, with add3 function-
>>>> 
>>>> 
>>>>        int add3(int i, int j)
>>>>        {
>>>>        int k = i+j;
>>>>        return k;
>>>>        }
>>>> 
>>>>        * Create LLVM IR using Xcode 5.1¹s clang ( *clang ­S -O0
>>>>        -emit­llvm a.c* )
>>>>        * Create obj file ­ using llc - *. /i686-apple-darwin11-llc
>>>>        -filetype=obj -mtriple=thumbv7-windows-msvc -O0 a.s *
>>>> 
>>>> 
>>>>    ... in general this doesn't work. The transformation from C to
>>>>    LLVM IR needs to know the target triple. Try "clang
>>>>    --target=thumbv7-windows-msvc a.c -c -o a.obj"? Since clang has a
>>>>    built-in assembler, you should get a valid COFF file out, to the
>>>>    extent that clang and llvm support this target.
>>>> 
>>>>    If that doesn't work, I may suggest it's unsupported.
>>>> 
>>>> 
>>>> As Nick mentioned, please generate the object file directly from
>>>> clang. You can use armv7-windows or thumbv7-windows (clang will
>>>> translate armv7-windows to thumbv7-windows implicitly). I just fixed a
>>>> bug that should allow you to link the object files with link.
>>>> 
>>>>    Nick
>>>> 
>>>>        * Now on a Windows 8.1 Desktop machine, link this object file
>>>>        into
>>>> 
>>>>        sample (new DirectX app, windows phone) Visual Studio 2013
>>>>        project.
>>>>        * Declare and Call add3 in the sample windows project.
>>>>        * I then get a linker error on building the solution.
>>>> 
>>>>        *1>app.obj : error LNK2008: Fixup target is not aligned 'add3'*
>>>>        *1>LINK : fatal error LNK1165: link failed because of fixup
>>>>        errors*
>>>>        *========== Rebuild All: 0 succeeded, 1 failed, 0 skipped
>>>>        ==========*
>>>> 
>>>> 
>>>> 
>>>>        Could someone please confirm about the state of support for
>>>>        Windows
>>>>        Phone 8.1 ? Or am I missing something here?
>>>> 
>>>>        Thanks,
>>>>        Daman
>>>> 
>>>> 
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>>>> 
>>>> 
>>>> 
>>>> 
>>>> --
>>>> Saleem Abdulrasool
>>>> compnerd (at) compnerd (dot) org
>> 
> 
> 
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-- 
Saleem Abdulrasool
abdulras (at) fb (dot) com

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